Nakamichi

Service Manual

Nakamichi BX-125 BX-125E 2 Head Cassette Deck

CONTENTS

2. 3.

1.

General 34.65 3.4) helt eo attire Eanes Stra ty, ala Ae a earths Ras Seats keel d eae Rd A oe coe aBeoatedel ty hae Ae 1 Test: Tapes and:Gauges «3.05006 3.5 ie ev cnewinaa Pd Soro ve a. ON goods SES RP de oboe BOR la ek Gi ee 2 Mechanical Adjustments: 2265-0516 666.002 Vinod Baia GS Soslle WR ats Bed eee wie Peewee De betta ey ihe 2

38. 21. Tape Guide Height Check for Record/Playback Head and Erase Head ................-02.. 2 8. 2. Head Base Stroke Check ...... 0.0... 0c cece eee ee ee een eee e ene ce ee 2 3. 3. Record/Playback Azimuth Alignment and Height Check .............. 0.00 eececcces 2 3. 4, Pressure Adjustment of Pressure Roller... 2... ee ee ee eee eee e eee 3 3. 5. Tape Travelling Check oo. 5.0 3.56e eee ee 8b adie Beck kG ae olga bags S08 OM Row ahaa ncaa 3 3. «6. Eject Damper Adjustment ......... 000000 c cece eee eee eee eben eee b ee neee 3 3. 7. Reel Motor Speed Adjustment in Play Mode ......... 0.0... 00. cece eee ence e een ee 3 3. 8. Tape. Speed Adjustments se. 5) 5 ee eees koe Svea cee he eae Bek Bk ea bo ly OR hg 3 3. 9. TUBPiCAbION 65) oso. 3. S552 eo ANE ek Ea eylee wee aticel Pode A et es ae a, ened mnaese pata no Le 3

Parts Location for Electrical Adjustment .........0.0 00000000 cece ee eee ee eee tence ene ne nenas 4 Electrical Adjustments...:3. 6 v0.6 a cvidieie Gis eS 5 be 0 bbe ae Ew OSA a bw N Oe bb ab ole waa Nba bs 5

5. 1. Adjustment Instructions 2... 0.0.00 00 0c cece eee eee ee ee eee eee e epee ne eens 5 5. 2. Playback Frequency Response Adjustment .......... 0.000 ee ee ece ce cee eee neeyees 7

Mechanism Ass’y and Parts List... 1.1... ee ee ee ne en eee een e eee een eneuns 8 6. 1. SY MEN SSI9 25 32 vetig sn red ce yarn tas hence yt a teu peer Me osc eae eye ae reese ay Bee a eat a BE cect 8 6. 2. Synthesis Mechanism Ass’y (A01) ........0.0 0.00. cece eee ee ee eee een eee eenns 9 6. 3. Mechanism, Ass’y-(BOL) so... co 4.ce28 5S be Gh edivnc ohaccw ee vba vane Seals ese av hh tbody elation g 11 6. 4. Rear. Panel. Ass’y (B02) © ss... cosy dace sb eee ooo wie ae Dae G aE eagle bia 13

Mounting Diagrams and Parts List .. 0.0.0... occ ee eee ee ee een eee nen ene eennnas 14 PALL Power Switch P.C.B. Ass’y 2.0... ccc ec ec eee tne ec eee e eee eee eseerteeeuas 14 Te 2. GED: PCB: Assy se ise laced tn. Gey ee 8 a aaa ts need eesti ee ea late gto tee ae be TA 7. 8. Timer Switch P.C.B. Ass’y ...... GiRaEES. oh toni Semin es 3.8, codons Ie settaco a encumid inno wind 14 7. 4, Shut-off P.C.B. Ass’y.......... Poe Gable elk ahd, See im, do Gis oe datos dh, Blige ce de ge onde Mitbne IS Be EM ee ge eae de 14 7. 6. Dolby NR Switch P.C.B. Ass’y 2... eee eee eee eee nee bbe nae 15 7. 6. Volume PC. Bs Assy 0 scsi bea a Seay ahiacs whee Ras ig oe aud atone Pons d ate ah Be oe SO 15 7. 7. Control Switch P.C.B. Ass’y 2... 2... ee eee ee eee eben een nenns 15 7. 8. Tape Switch P.C:B. Ags? V oe oh eed aaa goed. duels we Peg Se altaal bce bed Gow dow Bablate ohio wees 16 7. 9. Indicator P:C.By Ass? Y 225-5: Gee wie icky bec ROE apd Uae: Degen ati, 8 Bosh bossa eee aoe wha ate Oe eed Behe 16 7. 10. Main PC Bi Ass’ si Scares: « lead deal oda Wo wide ee bee OO ee ash Mate Ape ole A Natu Mota sod Se 17

Schematic! Diagtant s,s. 5 soo 2 sires an ere Bh woke vee bob GH Elander ates REE Oo Wee eave Wa aioe Cae ia ache tes bo 19 8. 1. I€ Block: Diagrams... 032i a)a aise 48 a a peo ere a Soa B Huy does wa ga old bral are Wee aoa 19 8. 2. Schematic Diagram ......... 0. cc ce ee ee eee teen ee cece nent en naaea 20

Wiring Diagranni >: ,.0..6 sie feet ed ite hot bin Talay Bobo ds SAR Bw aor Re wire bof ah bln au Ele eS Slav acta be nw Doe Qoasans. Godel 21

Block! Diagrams’: jc. <c<feis. fase. cisco Gatien ale wtay ete. Std Oe aha ope teies «ay Bar EvaNGES, gh haouba breceey oeet a acieie Rakdes 22 Timing Chart and Eq. Amp, Frequency Response ............. 000 cee cece eet eee e een eeennas 24 Specifications: 2 vi see esse cess puetiotn vo oe olin Bole Rite toolny ca ko ee erie Aa © alata Ae aN oh DEEN GDA aac tas Re ee eve 26

GENERAL

1.1. Voltage Selector Voltage selector is installed on the rear panel for Other version of the Nakamichi BX-125.

This voltage selector can select either 120 V or 220-240 V at customer’s disposal.

1.2. Packing Materials and Owner’s Manual

o “ Part No, Description Q

OFO3855A Carton Box BX-125 (Silver) OF03857A Carton Box BX-125 (Black) OFO3856A Carton Box BX-125E (Silver) OFO3858A Carton Box BX-125E (Black) OF03674C = Packing

0D04517A Owner’s Manual (English) 0D04518A Owner’s Manual (English/German/French)

0D04522A Owner's Manual (Japanese) HR Dee

1.3. Serial Number

The BX-125/BX-125E has two versions, Silver and Black.

In the service manual, serial numbers of these versions are identified as follows:

Silver version: A322xxxxx

Black version: A323xxxxx However, the actual serial number on the serial number plate of the BX-125/BX-125E is indicated as A322.3xxxxx.

The serial number begins with A322.301001.

ees Sanath

2. TEST TAPES AND GAUGES

(1) 400 Hz Level Tape (DA09005B)

(2) 1 kHz Track Alignment Tape (DA09007B)

(3) 15 kHz Azimuth Tape (DA09004B) (4) 3 kHz Speed and Wow/Flutter Tape (DA09006C)

(5) 10 kHz PB Frequency Response Tape (DA09003B)

(6) 15 kHz PB Frequency Response Tape (DA09002B) (7) 20 kHz PB Frequency Response Tape (DA09001B)

(8) Tape Travelling Cassette (DA09027B)

(9) Reference EXII Tape (DAO9066B) (10) Reference SX Tape (DA09025B) (11) Reference SX-E Tape (DA09086A)

(12) Reference ZX Tape (DA09037B) (13) Head Alignment Gauge (DA09092A)

3. MECHANICAL ADJUSTMENTS

3.1. Tape Guide Height Check for Record/Playback Head and Erase Head

With use of a Head Alignment Gauge, tape guide height check

for the Record/Playback and Erase Heads shall be made, wherein

a small block shall be pushed straight down to the base while in use of the Head Alignment Gauge. Refer to Fig. 3.1.

(1) Record/Playback Head Tape Guide Height

(a) Load the base of the Head Alignment Gauge carefully and set

the cassette deck in Play mode. (b) Place the small block of the Head Alignment Gauge on the

base.

(c) Slide the small block against the tape guide of the Record/

Playback Head, and check to insure that the block is ac- cepted by the tape guide,

(d) If not, loosen the screw and insert a shim (either 30 um (0C80048A), 60 um (0C80038A), or 100 um (0C80039A)) to raise the Record/Playback Head, then tighten and apply a

quantity of lock tight paint to the screw.

(2) Erase Head Tape Guide Height (a) Load the base of the Head Alignment Gauge carefully and set

the cassette deck in Play mode. (b) Place the small block of the Head Alignment Gauge on the

base,

(c) Slide the small block against the tape guide of the Erase Head, and check whether the block is accepted by the tape guide,

3.2, Head Base Stroke Check Refer to Fig. 3.2.

{1) Load the base of the Head Alignment Gauge carefully, then

push the base toward the Record/Playback Head to eliminate the clearance between the reference pin and the base.

(2) Set the cassette deck in Play mode.

(3) Place the small block of the Head Alignment Gauge on the

base,

(4) Contact the small block with the Record/Playback Head

surface and the Erase Head surface, and check whether the

end of the small block is located within the specified toler- ance as shown in Fig. 3.2,

3.3. Record/Playback Azimuth Alignment and Height Check Refer to Fig. 3.1.

(1) Connect a VTVM to the Output Jacks, (2) Load a 15 kHz Azimuth Tape and set the cassette deck in

Play mode,

(3) Turn the Azimuth Alignment Screw until the outputs of both channels become maximum.

(4) Load a 1 kHz Track Alignment Tape and set the cassette deck in Play mode,

(5) Check to insure that the readings of both channels on the VTVM are below —25 dB.

If not, replacement of the Record/Playback Head will be required.

(6) Apply a quantity of lock tight paint to the Azimuth Align-

ment Screw,

Shim

3.4. Pressure Adjustment of Pressure Roller Refer to Fig. 3.3.

(1) In Play mode, measure the torque of the Pressure Roller and

check whether the torque is in a range of 320 +50 g-cm. (2) If torque is out of the range, correct it by changing the instal-

lation point of the Pressure Roller Spring.

3.5. Tape Travelling Check

Load a Tape Travelling Cassette and set the cassette deck in Play mode to check the followings:

(1) After more than 2 seconds, the fluctuation of the tape travel- ling on the Record/Playback Head is small.

(2) Tape is in contact with the head sufficiently.

(3) Tape waving is small on the heads and pressure roller,

3.6. Eject Damper Adjustment

Refer to Fig. 3.4, Load a cassette tape, and with opening the

Cassette Case by pressing the Eject button and closing it by hand,

adjust the speed of damper action by the Damper Adjustment Screw.

CCW: Damper moves fast. CW: Damper moves slowly.

3.7, Reel Motor Speed Adjustment in Play Mode

(1) To warm-up the cassette deck, load a C-60 cassette tape and

set the cassette deck in Play mode.

(2) After more than four minutes, load a torque meter TW-211

(made by Sony) and set the cassette deck in Play mode.

(3) Adjust VR601 on the Main P.C.B. Ass’y to obtain exactly 50 g-cm on the torque meter.

3.8. Tape Speed Adjustment Refer to Fig. 3.5. (1) Connect a frequency counter to the Output Jacks.

(2) Load a 3 kHz Speed and Wow/Flutter Tape and play it back,

(3) Adjust the Tape Speed Adjustment Volume incorporated in the Capstan Motor to obtain 3,000 Hz on the frequency

counter,

CCW: Motor drives slowly.

CW: Motor drives fast.

3.9. Lubrication The tape transport is of a lubrication-free type mechanism. When the following parts are replaced, apply the specified lubricant, (1) Molykote (R) Grease (X5-6020)

Cam Motor Pulley Thrust portion on the Capstan Shaft

(2) FLOIL GB-TS-1

Washer between Reel Hub Ass’y and Back Tension Spring (8) Diamond Oil (EP56)

Reel Hub Shaft

(4) Anderol 456

Capstan Shaft

Note: We suggest that you use the above specified lubricant or equivalent type.

The company dealing in the above lubricant is as follows: (a) Molykote (R) Grease (X5-6020)

Dowcorning Co., Ltd., 1-15-1 Nishishinbashi, Minato-

ku, Tokyo, Japan

(b) FLOIL GB-TS-1 Kanto Chemicals Co., Ltd., 2-7 Kanda Sakuma-cho,

Chiyoda-ku, Tokyo, Japan

(c) Diamond Oil (EP-56) Mitsubishi Oil Co., Ltd., 1-2-4 Toranomon, Minato-ku,

Tokyo, Japan

(d) Anderol 456

Toyo Kokusai Oil Co., Ltd., 3-3-5 Hatchobori, Chuo- ku, Tokyo, Japan

Fig. 3.3

‘4 Increase

Damper Adjustment Screw

Fig. 3.4

Decrease N

Increase

Fig. 3.5

4, PARTS LOCATION FOR ELECTRICAL ADJUSTMENT

Main P.C.B. ®

free eo Level

VR1I08 VR208

io) (o) MPX iflter

vR6ol

Reel Motor Speed VRIO4 VRI03 VRIO2

{Play}

EX Rec. Cal. Sx zx Playback Level

VR204 VR203 VR202

@ oo F102 TP103

(o)uss Bias Trap (Record)

Peaking

TP203 TP102

pee L203 TP202

T301

@ Bias Osc. Frequency A317

Bi = jas ut

VR105 VRI06 VRIO7 U3

aee VR205 VR206 VR207

Tape Switch P C.B.

Fig. 4

5. ELECTRICAL ADJUSTMENTS

Note: Electrical adjustment should be performed after mechanical adjustment is completed. 5.1. Adjustment Instructions

OUTPUT

CONNECTION

Playback

Eq. - 70 ys Adjust the volume incorporated in the capstan motor to obtain 3 kHz +0.5% on the frequency counter.

Frequency

Counter to

Output

Jacks

Tape Speed

Adjustment

1. Feed in 400 Hz and adjust the Input

Level controls to obtain 350 mv -0.8 dB on the VIVM.

2. Adjust VR108 (VR208) so that the 0 dB segment of the level meter starts

illuminating.

3. Adjust the Input Level controls to obtain 350 mV on the VIVM, then

decrease the generator output level by

20 dB. 4. Check to insure that the segment for

-20 dB illuminates.

VIVM to

TP101,TP201 on Main

P.C.B.

Meter Level|400 Hz to Record, Pause/Main

Calibration] Input Jacks

Set the Output Level control to max,

Adjust the Input Level controls to obtain 500 mV (0 dB) on the VTVM.

2. Set the MPX Filter switch to ON and adjust L105 (L205) to obtain minimum reading on the VIVM (minimum reading will be less than -30 dB).

Record, Pause|Main MPX - OFF/ON |P.C.B.

19 kHz

+100 Hz to

Input

Jacks

MPX Filter Adjustment

Adjust the Record/Playback Head Azimuth Alignment Screw to obtain maximum readings for both channels on the VTIVM.

VIVM to

Output

Jacks

Playback Eq. - 70 ps

Dolby NR - OFF

MPX - OFF

Record/ Playback Head

Azimuth Alignment

Adjust VR101 (VR201) to obtain 350 mV on the VIVM.

VTIVM to Same as above|Main TP101,TP201

on Main

P.C.B.

400 Hz Level Tape

Playback Level

Calibration

- Load a 400 Hz level tape and play it back,

Adjust the Output Level control toa

certain level.

2. Load 10 kHz, 15 kHz and 20 kHz PB

400 Hz Same as above |Main Level Tape| Output

10 kHz PB | Jacks

Frequency

Response

Playback Frequency

Response

Adjustment

Tape frequency response tapes and play 15 kHz PB them back, Adjust the record/play-

Frequency back head azimuth to obtain maximum Response readings for both channels on the

Tape VTIVM with each tape.

20 kHz PB Short R110 (R210) or R195 (R295) on Frequency the Main P.C.B. Ass'y to obtain the Response following levels against the lewel for Tape the 400 Hz level tape.

10 kHz: -20 dB -2 to +2 dB

15 kHz: -20 dB -2 to +3 dB

20 kHz: -20 dB -2 to +4 dB

3. Conduct step 4 "Record/Playback Head

Azimuth Alignment".

STEP ITEM picasras pena REMARKS

pemecriiae

7 |Bias Frequency |Record, Pause Tape - Connect an additional 0.1 ohm resistor

Oscillation Counter to |Tape - ZX in series to the Erase Head and

Frequency CN2-2 on Eq. - 70 ps -C. connect a VIVM across it. and Erase Tape Switch] Dolby NR - 2. Adjust T301 to obtain 105 kHz on the Current P.C.B. OFF frequency counter,

Adjustment and MPX - OFF 3. Check the erase current by the VTVM.

310 mA to 400 mA (typically approx. VIVM across Erase current will be in a range of

350 mA).

the

additional

0.1 ohm If erase current is not sufficient,

resistor increase it by shorting either R318 or

R350. 4. After completion of the erase current

adjustment, re-check the bias

oscillation frequency, 5. Remove the additional 0.1 ohm

resistor,

21 kHz VIVM to Same as above|/Main Short the bias cut points indicated in Record

Amplifier |(-20 dB) |TP102,TP202 -C.B. Fig. 4 with a clip to stop bias Equalizer to Input on Main oscillation,

Adjustment | Jacks P.C.B. 2. Adjust L102 (L202) to obtain peak reading at 21 kHz on the VIVM.

Remove the clip.

Adjust L103 (L203) to obtain maximum reading on the VTVM.

Bias Trap |None VIVM to Same as above

Adjustment | (remove TP103 ,TP203 (Record input on Main Amp.) signals) |P.C.B.

Record 400 Hz VIVM and Record and Adjustment should be made in the order of Level (0 dB) and} Distortion |Playback ZX, SX and EX. Calibration|15 kHz Meter to Tape - ZX/SX/| (Level) and (-20 dB) Output EX ZX: 1. Set the Output Level control to max.

Recording to Input | Jacks Eq. - 70 ps VR102 2. Set the cassette deck in Record/Pause Bias Jacks (ZX/SX) mode, Current 120 ps 3. Feed in 400 Hz and adjust the Input

Adjustment (EX) Level controls to obtain 500 mV Dolby NR - (O dB) on the VTVM.

OFF 4. Load a reference ZX tape, reference

MPX - OFF SX/SX-E tape and reference EXII tape. 5. Feed in 400 Hz (0 dB) and record,

rewind and play it back. Adjust VR102 (VR202) for ZX tape, VR103 (VR203) for SX/SX-E Tape and VR104 (VR204) for EXII tape so that the played back output levels are 500

mV (0 dB) on the VTVM. Feed in 15 kHz (-20 dB) and record,

rewind and play it back. Adjust VR105 (VR205) for ZX tape, VR106 (VR206) for SX/SX-E tape and VR107 (VR207) for EXII tape so that the played back output levels are 50

mV (-20 dB) on the VIVM. 7. Repeat above 5 and 6 two or three

times.

8. Feed in 400 Hz (0 dB) and record, rewind and play it back. Check to insure whether the total harmonic

distortion is less than 1.0% for ZX

and EXII tapes and 1.2% for SX/SX-E tape. If the total harmonic dis- tortion exceeds the specified value,

repeat above steps till satisfactory results are obtained.

Switch

P.C.B.

(Bias)

a

ITEM SIGNAL OUTPUT MODE ADJUST~

SOURCE CONNECTION MENT

Overall 400 Hz Record and Set the cassette deck in Record/Pause Frequency | (0 dB) and| Output Playback mode. Response 20 Hz to Tape - ZX/SX/| L102 Feed in 400 Hz and set the Input Level Adjustment |17 kHz EX controls to obtain 500 mV (0 dB) on

(-20 dB) Eq. - 70 ps the VIVM. to Input (2X/SX) Decrease the generator output control Jacks 120 ps by 20 dB.

(EX) Feed in 20 Hz to 17 kHz (-20 dB), and Dolby NR - record, rewind and play them back,

OFF then check to insure whether the out- MPX SW - OFF put levels are within -20 dB +4 dB.

. If above is not sufficient, adjust L102 (L202) to obtain approx. ~20 dB on the VIVM, then conduct step 10

"Record Level Calibration and Recording Bias Current Adjustment". If above is not sufficient, precise re-adjustment of step 6 "Playback Frequency Response", replacement of

Record/Playback Head or tape travel- ling check will be required.

5,2, Playback Frequency Response Adjustment

Figs. 5.1 and 5.2 show the playback amp. circuit for adjustment The peaking portion of the equalization curve compensates the and the playback equalization curve. gap loss of the playback head, Peaking level is varied by the short This adjustment will be required if playback level is not sufficient circuit of R110 (R210) or R195 (R295). when a 20 kHz PB frequency response tape is played back.

R RIO RI9S (R210) (R295) 680 1K R/P

Head VRIOt [VR201)

Output

390P

HI

C108 (C208) 1000P

+H C107 (C207) 120y8

Fig. 5.1

GAIN (dB)

FREQUENCY (Hz)

Fig. 5.2

6. MECHANISM ASS’Y AND PARTS LIST

6.1. Synthesis

01

HA04494B 0H04582B 0H04583B 0304628A 0H04306A 0H04240A HA04571A OJ04765A OH04276A 0H04432B 0OHO3737A 0H04155B 0M04377B 0J04629A

0J04762A OJ03564A OE03054A OE03033A

OEO0868A OEOO865A

Description

Synthesis Serial No.: 432201001 - (Silver)

Cassette Case Cover Ass’y Front Panel Ass’y BX-125 Front Panel Ass’y BX-125E Top Cover Cushion (Front) Meter Cover LED Lens Eject Button Ass’y Spring Counter Escutcheon Volume Knob Volume Knob Base Top Cover Caution Label Top Cover Cushion (Back) Synthesis Mechanism Ass’y Bottom Cover Leg T-H BT 3x8 © Countersunk BT 4x8 © Pan Washer-faced

(Nickel) BT 3x8 © Binding BT 3x10 © Binding

Fig. 6.1

PAT PP RPE NN BHP PEN ee

HA04495B 0H04584B 0H04585B 0J04628A 0HO04307A 0H04240A HA04570A OJO4765A OH04275A 0H04342A OHO3737A 0H04156B 0M04377B 0J04629A

0J04762A 0J03564A OE03054A 0E03032A

OEOO868A OEO00865A

Synthesis Serial No.: A32301001 - (Black)

Cassette Case Cover Ass’y Front Panel Ass’y BX-125 Front Panel Ass’y BX-125E Top Cover Cushion (Front) Meter Cover LED Lens Eject Button Ass’y Spring Counter Escutcheon Volume Knob Volume Knob Base Top Cover Caution Label Top Cover Cushion (Back) Synthesis Mechanism Ass’y Bottom Cover Leg T-H BT 3x8 6 Countersunk BT 4x8 © Pan Washer-faced

(Black Chromate) BT 3x8 © Binding BT 3x10 & Binding PWD PPR EEN Re Hee Hee

6.2, Synthesis Mechanism Ass’y (AO1)

Schematic Ref, No.

OH04277A HAO04794A OHO4288A BA05637A 0J04838A BA05635A 0J04984A BA05630A OJO4767A BAO5089A 0H04289A 0H04283B 0H04272A 0J04703A 0J04704A BAO5639A 0J04840A BA05638A 0H04274A O0C08602A 0J04764A O0C08604A 0H04309A BA05641A 0304843A BA05640A OBO08511A 0J04611A 0H04290A BA05230A

BA05231A

BA05229A

0M04196A 0H04154C CA08498A BA05131A BAO5627A BA02757A-E 0J04603F 0J04773D HA04759B

HAO04791A HAO04760A HAO4761A

HA04771B HA04758A HA04762A

OBO851i5A 0J04581A OB08525A

OBO8854A 0B08347U

0M04131B

0B08349B

OEO0868A OEOO766A OE03074A

OEOO857A OBO8583A

OE00859A OE03070A OEO00835A OE00824A OE00954A 0E03028A

Description

Synthesis Mechanism Ass’y Serial No.: A32201001 - (Silver)

Meter Scale Front Chassis Ass’y Push Switch Button Tape Switch P.C.B. Ass’y Holder Dolby NR Switch P.C.B. Ass’y Cushion A LED P.C.B. Ass’y Memory Switch Holder Indicator Ass’y Slide Volume Knob Slide Volume Plate Memory Switch Knob Bushing A Bushing B Volume P.C.B. Ass’y Indicator P.C.B. Holder Indicator P.C.B. Ass’y Counter Knob Tape Counter Counter Holder Counter Belt Slide Switch Knob Timer Switch P.C.B. Ass’y Timer Switch P.C.B. Holder Control Switch P.C.B. Ass’y Headphone Jack Headphone Plate Power Switch Button Power Switch P.C.B. Ass’y BX-125

(U.S.A. & Canada) Power Switch P.C.B. Ass’y BX-125

(Japan) Power Switch P.C.B. Ass’y BX-125

(Australia & Others) & BX-125E

Cassette Label (Silver) Cover Plate Mechanism Ass’y Earth Wire Main P.C.B. Ass’y BX-125 Main P.C.B. Ass’y BX-125E Side Chassis L Side Chassis R Rear Panel Ass’y BX-125

(U.S.A.) Rear Panel Ass’y BX-125 (Japan) Rear Panel Ass’y BX-125 (Others) Rear Panel Ass’y BX-125

(Australia) Rear Panel Ass’y BX-125 (Canada) Rear Panel Ass’y BX-125E (UK) Rear Panel Ass’y BX-125E

(220V Class 2) Insu-Lock Counter Cushion Fuse 2A 250V BX-125

(U.S.A., Canada & Others) Fuse 2A BX-125 (Japan) Fuse T1A 250V BX-125

(Australia) & BX-125E Fuse Label T1A BX-125

(Australia) & BX-125E Fuse Clip BX-125 (Australia) &

BX-125E BT 3x8 6 Binding M3x8 © Binding BT 2.6x8 @ Binding with Toothed-

Lock Washer BT 3x6 © Binding Plastic Rivet Nut Washer BT 2.6x6 © Binding M2.6x6 © Binding BT 3x25 @Pan BT 2.6x6 ® Pan (Black Chromate) BT 2.6x8 © Binding BT 3x8 © Binding (Nickel)

BOHM BER eR Ree I ee ee

i

ee

ONT PB BP NN NWR BHR BEE Be Ree eR

An

DD Re OO et

To

10

0H04278B HA04795A 0H04248A BA05637A OJ04838A BA05635A 0J04984A BA05630A OJ04767A BA05089A 0H04247B 0H04284B OHO04271A 0J04703A 0J04704A BA05639A 0J04840A BA05638A 0H04273A OC08602A 0J04764A O0C08604A 0H04242A BAO5641A 0J04843A BA05640A OBO8511A 0J04611A 0H04243A BA05230A

BA05231A

BA05229A

0M04392A 0H04154C CA08498A BAO5131A BA05627A BA02757A-E 0J04603F 0J04773D HA04764A

HAO04792A HA04765A HA04766A

HAO04772A HA04763A HAO4767A

OBO8515A 0304581A OBO8525A

OB08854A 0B08347U

0M04131B

OBO8349B

OE00868A OEOO766A OE03074A

OEOO857A OB08583A

OEOO859A 0E03070A 0E00835A OE00824A OE00954A OE00921A

Description

Synthesis Mechanism Ass’y Serial No,: A32301001 - (Black)

Meter Scale Front Chassis Ass’y Push Switch Button Tape Switch P.C.B. Ass’y Holder Dolby NR Switch P.C.B. Ass’y Cushion A LED P.C.B. Ass’y Memory Switch Holder Indicator Ass’y Slide Volume Knob Slide Volume Plate Memory Switch Knob Bushing A Bushing B Volume P.C.B. Ass’y Indicator P.C.B. Holder Indicator P.C.B. Ass’y Counter Knob Tape Counter Counter Holder Counter Belt Slide Switch Knob Timer Switch P.C.B. Ass’y Timer Switch P.C.B. Holder Control Switch P.C.B. Ass’y Headphone Jack Headphone Plate Power Switch Button Power Switch P.C.B. Ass’y BX-125

(U.S.A. & Canada) Power Switch P.C.B. Ass’y BX-125

(Japan) Power Switch P.C.B. Ass’y BX-125

(Australia & Others) & BX-125E

Cassette Label (Gold) Cover Plate Mechanism Ass’y Earth Wire Main P.C.B. Ass’y BX-125 Main P.C.B. Ass’y BX-125E Side Chassis L Side Chassis R Rear Panel Ass’y BX-125

(U.S.A.) Rear Panel Ass’y BX-125 (Japan) Rear Panel Ass’y BX-125 (Others) Rear Panel Ass’y BX-125

(Australia) Rear Panel Ass’y BX-125 (Canada) Rear Panel Ass’y BX-125E (UK) Rear Panel Ass’y BX-125E

(220V Class 2) Insu-Lock Counter Cushion Fuse 2A 250V BX-125

(U.S.A., Canada & Others) Fuse 2A BX-125 (Japan) Fuse 1AT 250V BX-125

(Australia) & BX-125E Fuse Label 1AT BX-125

(Australia) & BX-125E Fuse Clip BX-125 (Australia) &

BX-125E BT 3x8 ® Binding M3x8 @ Binding BT 2.6x8 © Binding with Toothed-

Lock Washer BT 3x6 @ Binding Plastic Rivet Nut Washer BT 2.6x6 & Binding M2.6x6 © Binding BT 3x25 @ Pan BT 2.6x6 @ Pan (Black Chromate) BT 2.6x8 © Binding BT 3x8 @ Binding

(Black Chromate)

1

BP HP BRB REE E RP EE Ee e ePeeENENDe eP ee

ba

wm

OC WN PB FP ND NOR HR PPR Pee eRe

an Re

PHD HHO HE

vo

6.3, Mechanism Ass’y (B01)

Fig. 6.3

il

Schematic Ref, No.

CA08498A

CA80001A 0G01371A OC80001A 0G01365A 0C80044A 0C80045A 0C80003A 0C80004A OC 80005A OC80006A CA80002A CA80003B CA80004B OC80007A CA80005A OC80008A OC80009A 0C80010C 0C80043A 0C80012A 0C80013A 0C80014A 0C80015B 0C80016A OC80017A 0C80018A 0C80019B 0C80020A OC80021A CA80006A 0C80022B 0C80023A 0C80024A 0C80025A 0C80026A 0C80027A CA80007A 0C80028A CA80011A 0C80029A 0C80030A CA80008B 0C80031A 0C80033A 0C80034A CA80009A 0C80035A 0C80036A CA80010A OC80037A 0C80040A 0C80041A 0C80042A 0C80635B 0C80046A OE03038A 0E03053A 0C80048A 0C80038A 0C80039A OE03046A 0E03042A 0E03049A OE03050A 0E00222A 0E03043A OEO0698A OE03052A 0E00181A 0E03048A 0E03036A 0E03044A OEOO691A OE03045A OE03051A OE03037A 0£03047A OE03041A OE03040A 0E03035A OE03245A

Description

Mechanism Ass’y Serial No.: A322.301001 -

Cassette Case Ass’y Record/Playback Head RP-2G Azimuth Adjust Spring Erase Head E-2D Erase Head Collar Record/Play back Head Collar Head Base Hold Plate Steel Ball 3mm Reinforcement Plate Head Base Brake Ass’y Take-up Reel Hub Ass’y Supply Reel Hub Ass’y Steel Ball 2mm Pressure Roller Ass’y Pressure Roller Spring Cassette Case Spring Cassette Case Holder R 5P-H Connector Eject Sensor Lock Lever Spring Lock Lever Collar Lock Lever Brake Spring Record Protector Lever Cassette Case Holder L Eject Spring Eject Lever Spring Eject Lever Pneumatic Damper Ass’y Cassette Hold Spring Mechanism Chassis Record Protector Record Protector Holder Cam Mode Switch Control Motor Ass’y Control Motor Holder Shut-off P.C.B. Ass’y Back Tension Spring Reel Motor Holder Reel Motor Ass’y Capstan Flange Fly wheel Capstan Belt Fly wheel Holder Ass’y Sleeve Floating Rubber Capstan Motor Ass’y Insu-Lock 2P-H Connector 4P-H Connector 9P-H Connector Idler Pulley Azimuth Alignment Screw M2x12 © Binding Wire Holder Shim 0,.03T Shim 0.06T Shim 0.1T M2.6x6 @ Pan (2A) FT 2.5x5 ®Pan Washer 1.8mm Washer 3.1mm E-Ring 2mm FT 2.5x10 @ Pan E-Ring 2.5mm Stopper Ring 2.4mm E-Ring 3mm FT 2.6x6 ®@Pan M2x4 © Pan (2A) FT 2.5x20 © Pan M2x3 @ Pan M2.6x3 ® Binding Washer 2.5mm M2x5 @ Pan (2A) M2.6x9 @ Pan FT 2,5x4 ® Pan FT 2.5x3,.5 @ Pan M2x3.2 ® Truss Mylar Washer 1.3x3.3x0.3

1 1 1 1 2 1 1 1 1 1 1 1 1 3 1 1 1 1 1 1 L 1 1 1 1 1 1 1 1 1 1 1 1 1 1 3 1 1 1 3 1 a 1 1 1 1 3 3 1 3 1 1 1 1 1 3 1

HERP N WOH RDN He Rh eee OO

12

6.4. Rear Panel Ass’y (B02)

05

Fig. 6.4

Schematic Ref, No.

Part No, Description

01

02

03

04

HA04759B HA04771B

HAOA761A

HAO4791A HA04760A HA04758A HA04762A

0HO4586A 0HO4587A BAO5087A

(0B81001A) (OE00037A) 0B50040A

0B50009B

0B50011B

0B50010B

0B08037U

OBO8351A

Rear Panel Ass’y BX-125 (U.S.A.) Rear Panel Ass’y BX-125

(Canada) Rear Panel Ass‘y BX-125

(Australia) Rear Panel Ass’y BX-125 (Japan) Rear Panel Ass’y BX-125 (Others) Rear Panel Ass’y BX-125E (UK) Rear Panel Ass’y BX-125E

(220V Class 2) Serial No.: A32201001 - (Silver)

Rear Panel BX-125 Rear Panel BX-125E 4P Pin Jack Ass’y (Consists of the

followings) (4P Pin Jack) (Earth Lug) Power Transformer BX-125

(U.S.A. & Canada) Power Transformer BX-125

(Australia) & BX-125E Power Transformer BX-125

(Japan) Power Transformer BX-125

(Others) Cord Bushing C BX-125 (U.S.A.,

Australia, Others & Japan) & BX-125E (220V Class 2)

Cord Bushing 4K-4 BX-125 (Canada) & BX-125E (UK)

aA

Be we eB Bee Bp

a

13

Schematic Ref. No,

06

07

08 09

LO1 LO2

L03 L04

02

03

04

05

06

07

08 09

LO01

LO2

LO3 L04 LO5

Part No.

0B08533A

OB08504A 0B05241A 0B08219B 0B08348A 0B08093U

0J04622B

0OM04407A

0B07092U 0C01162B

OE03028A 0E03034A

OE00897A

0B08583A OEOO637A OE03031A

HA04764A HA04772A

HAO4766A

HA04792A HAO4765A HA04763A HAO4767A

0H04588A 0H04589A BAO5087A

(0B81001A) (0£00037A) 0B50040A

0B50009B

0B50011B

0B50010B

0B08037U

0B08351A

OB08533A

OB08504A OB05241A OB08219B 0B08348A 0B08093U

0J04601B

OM03948A

0B07092U 0C01162B

OE00921A

0E03034A

OEOO907A

OB08583A OE00637A 0E00818A

Description

Power Cord BX-125 (U.S.A. & Others)

Power Cord BX-125 (Canada) Power Cord BX-125 (Australia) Power Cord BX-125 (Japan) Power Cord BX-125E (UK) Power Cord BX-125E

(220V Class 2) Switch Cover BX-125 (U.S.A.,

Canada, Australia & Japan) & BX-125E

Voltage Lock Plate BX-125 (Others)

Voltage Selector BX-125 (Others) Bolt Receptacle Plate BX-125

(U.S.A. & Canada) BT 3x8 © Binding (Nickel) M4x8 © Binding (Nickel)

BX-125 (U.S.A. & Canada) ST 4x8 © Binding (Nickel)

BX-125 (Australia, Others & Japan) & BX-125E

Plastic Rivet Washer 3.3x7x0.5 M3x8 © Binding (Nickel)

BX-125 (Others)

Rear Panel Ass’y BX-125 (U.S.A.) Rear Panel Ass’*y BX-125

(Canada) Rear Panel Ass’y BX-125

(Australia) Rear Panel Ass’y BX-125 (Japan) Rear Panel Ass’y BX-125 (Others) Rear Panel Ass’y BX-125E (UK) Rear Panel Ass’y BX-125E

(220V Class 2) Serial No.: A32301001 - (Black)

Rear Panel BX-125 Rear Panel BX-125E 4P Pin Jack Ass’y (Consists of the

followings) (4P Pin Jack) (Earth Lug) Power Transformer BX-125

(U.S.A. & Canada) Power Transformer BX-125

(Australia) & BX-125E Power Transformer BX-125

(Japan) Power Transformer BX-125

(Others) Cord Bushing C BX-125 (U.S.A.,

Australia, Others & Japan) & BX-125E (220V Class 2)

Cord Bushing 4K-4 BX-125 (Canada) & BX-125E (UK)

Power Cord BX-125 (U.S.A. & Others)

Power Cord BX-125 (Canada) Power Cord BX-125 (Australia) Power Cord BX-125 (Japan) Power Cord BX-125E (UK) Power Cord BX-125E

(220V Class 2) Switch Cover BX-125 (U.S.A.,

Canada, Australia & Japan) & BX-125E

Voltage Lock Plate BX-125 (Others)

Voltage Selector BX-125 (Others) Bolt Receptacle Plate BX-125

(U.S.A. & Canada) BT 3x8 ® Binding

(Black Chromate) M4x8 @ Binding

(Black Chromate) BX-125 (U.S.A. & Canada)

ST 4x8 © Binding (Black Chromate) BX-125 (Australia, Others & Japan) & BX-125E

Plastic Rivet Washer 3.3x7x0.5 M3x8 © Binding (Black Chromate)

BX-125 (Others)

an

BP He BR Re Be RR

HB Ree

Nu NN NF FH

Br

tee

BH Ree ee Be LY

nv N NE eS

NR

Q'ty

wh

7. MOUNTING DIAGRAMS AND PARTS LIST

Notes: 1, Mounting diagram shows a dip side view of the printed circuit board.

2. Diode is 18853, 181555, or 1SS176 unless otherwise specified. 3. Following transistors are interchangeable with each other.

a. 2SA733, 2SA608SP, 2SA1048, 2SA1175:

b. 28C945, 2SC536SP, 28C 2458, 28C2785

4, Abbreviation for part name:

TR — Transistor, SiD — Silicon Diode, ZD — Zener Diode

RK — Carbon Resistor, RM — Metal Film Resistor, RF — Fail Safe Type Resistor

CE — Electrolytic Capacitor, CM — Mylar Capacitor, CC — Ceramic Capacitor, CP — PP Capacitor, CT — Tantalum Capacitor, CF — Film Capacitor, C — Mica Capacitor

7.1, Power Switch P.C.B. Ass’y

AC Input BLK to Power

Transtormer

to Power Transformer

Fig. 7.1

7.2, LED P.C.B. Ass’y

LED302 C-Type

Fig. 7.2

Schematic ; Schematic

meh me

BA05626A | Set P.C.B. Ass’y BX-125

Main P.C.B. Ass’y BX-125 LED P.C.B. Ass’y Dolby NR Switch P.C.B. Ass’y Tape Switch P.C.B.

BA05627A

BA05630A BA05635A

BA05637A Ass’y

BA05638A | Indicator P.C.B. i Ass’y

BA05639A | Volume P.C.B. Ass’y

BA05640A | Control Switch P.C.B. Ass’y

BA05641A | Timer Switch P.C.B. Ass’y

BA05626A-E/ Set P.C.B. Ass’y BX-125E

1 BA05627A-E| Main P.C.B. Ass’y : BX-125E i BA05630A | LED P.C.B. Ass’y

BA05635A | Dolby NR Switch P.C.B. Ass’y

BA05637A | Tape Switch P.C.B.

BA05638A Ass’y Indicator P.C.B.

BA05639A

BA05640A

Ass’y Volume P.C.B.

BAO5S641A

Ass’y Control Switch P.C.B. Ass’y Timer Switch P.C.B. Ass’y

LED302

7.3. Timer Switch P.C.B. Ass’y

7.4. Shut-off P.C.B. Ass’y

De pe

BA05230A | Power Switch P.C.B. Ass’y BX-125 (U.S.A. & Canada) Power Switch P.C.B. Ass’y BX-125 (Japan) Power Switch P.C.B. Ass’y BX-125 (Australia & Others) & BX-125E

Power Switch P.C.B. Power Switch Spark Killer BX-125 (U.S.A, & Canada) Spark Killer BX-125 (Japan) Spark Killer BX-125 (Australia & Others) & BX-125E Spark Killer Cover BX-125 (Australia & Others) & BX-125E

BA05231A

BA05229A

0B02573D 0B70002A 0B08342A

0B08363A

OB08445A

0B90059A

0J04763A | Power Switch Holder (1) M38x6 @ Pan (2A)

(2) (2)

LED P.C.B. Ass’y

0E00612A

0E00752A

BA05630A

Eyelet 2x3

OB60183A 0B06333A OB81065A 0B82116B

LED P.C.B. LED Red TLR124A Wire Mate 2P (1) Ribbon Cable 2P(1)

14

Fig. 7.3

“ie

Shut-dt Pulse

to Logic Port

tev

Fig. 7.4

Schematic Ref. No.

BAO5641A

OB60189A OBO9687A OBO7437A 0B81011A

CA80011A

O0C80047A OB06388A OB06389A

OB09840A OB09841A

Desuiption

Timer Switch P.C.B. Ass’y

Timer Svitch P.C.B. RK 2.7x 1/6WJ Slide Switcha 2-3

(1) Dip Mate4P

Shut-off ?.C.B. Ass’y

Shut-off ?.C.B. TR 2802812 Photo Reflector NJL5141 RK 680 Leadless RK 18K Leadless

7.5. Dolby NR Switch P.C.B. Ass’y

LOLOy is

7.7, Control Switch P.C.B. Ass’y

e a Bia,

1° Ob vaaci [' Ofioxiars2”

Fig.

15

7.6. Volume P.C.B. Ass’y

1.7

gees Reo 2204] :

501 S|

“WooP OHbO

Bed i o-——-o

| VM=26°°GNO;-W

0000-lo 6T ol ig 2 2 9) L9_949 9; W GND VM-25

Fig. 7.6

yt Omen: oe R701150

VR301 R341 R361,362 SW 305/306 FC1,MD1 DM1 FC20/21

LED301 Cds301

VR110,210 R501,601 C501,601 $W601,602 FC8 VM25/26 FC17/VP32 FC20

Q701

Q702

LED701 703,704

LED702 705,706

D701,702

c701 SW701-708

Q304 VR105,107

205,207 VR106,206 R138,238 R139,239

BA05635A

OB60187A

0B30036A 0B01682A OBO9677A 0B70027A 0B81010A

0B02349A

BA05639A

0B60186A 0B06333A 0B06325B

0B31002A 0B09733A 0B09282A 0B07462A 0B81011A

0B81012A 0B81002A

BA05640A

OB60188A

0B10026A

0B10039A

0B06334A

0B06333A

0B06181A OB06398A

OBO9657A OBO9667A OBO09663A 0B09693A OB09677A OBO9701A OBO5557A 0B70004A

0J04744A

BA05637A

0B60184A OBO6069A 0B32010A

0B32009A OB09653A OBO9695A

OBO9707A 0B09705A OB09263A OBO09831A OB09837A 0B09283A 0B09828A 0B01403A 0B41229A OBO5796A

OBO09187A 0B81051A 0B81011A

0B81012A 0B81010A OBO6688C 0B70005A

0J304768B

Dolby NR Switch P.C.B. Ass’y

Dolby NR Switch P.C.B. VR 10K (A)x2 RK 6.8K 1/4WJ RK 1K 1/6w J Push Switch 2-Key Dip Mate 3P (3)

JP Connector 4P (1)

Volume P.C.B. Ass’y

Volume P.C.B. LED Red TLR124A Photocoupler

MCD7214F Slide VR 100K (A) RK 220K 1/6W J cc 100P 50V K Push Switch Dip Mate 4P (2)

Dip Mate 5P (1) Dip Mate 2P (1)

Control Switch P.C.B. Ass’y

Control Switch P.C.B. TR 2SA933S

(Q,R,S) TR 2SC1740S

(S,E) LED Green

TLG124A LED Red TLR124A

SiD 18853 18S176

150 1/6WJ 390 1/6WJ 270 1/6w J 4,71K 1/6W J 1K 1/6W J 10K 1/6WJ 0.015u 50V J

Touch Switch 4.3mm

LED Reflector (6)

Tape Switch P.C.B. Ass’y

Tape Switch P.C.B. TR 2SB564 (L,M) Semi-fixed VR 47K

Semi-fixed VR 22K RK 10 1/6w J

1/6w J

1/6W J 1/6w J 1/4w J 1w Jd

10 1w J 220P 50V K 8200P 100V J 47 16V 1500P 100V J 0.047 50V J

1p 16V (BP) 2P-S Post ql) Dip Mate 4P (2)

Dip Mate 5P ql) Dip Mate 3P (1) Bias Ose. Unit (1) Push Switch eS

(1) Earth Plate A (1)

Schematic Ref. No.

IC301 1¢701 Q704 ZD701,702 D301,302 D703-706 R301 R302 R303 R304 R305-314

R701 R702,703 704,709 711,715

R705

FC18/19

ne ya

BAO5638A | Indicator P.C.B Ass’y

OB60185A | Indicator P.C.B. OBO06369A | IC TA7612AP 0B11031A | IC TLO92 0B06013A | TR 2SA733 (P,Q) OB06191A | ZD 2.7V RD2.7E 0B06181A | SiD 1SS53 OB06398A iD 1SS176 (4) 0B01888A 10K 1/4WJ 0B01887A : 1/4W J 0B01857A 1/4W J OB09797A 1/4W J OB09681A

OB09677A 0B09725A 1/6w J

0B09709A 1/6w J OBO9685A : 1/6W J OB09701A 1/6W J 0B09749A 1/6W J 0B09737A 1/6w J OBO9717A 1/6W J 0B09713A 1/6w J 0B09281A 150P 50V K OB09868A O.1u 50V J 0B09163A 10u 16V (BP) 0B81012A | Dip Mate 5P ql) 0B81011A | Dip Mate 4P (2) OB02356A | JP Connector 12P

ql)

16

7.8. Tape Switch P.C.B. Ass’y

7.9. Indicator P.C.B. Ass’y

Fig. 7.8

Fig. 7.9

: i i

7.10. Main P.C.B. Ass’y

t i

i

| eer 2 ee

|

{

|

“qtos ~RSG945.'U).,....

Paani emma

F402 2A 250VITIA 250)

Clze * 0-15 y SOVILN)

‘Hho

Fig. 7.10

17

Schematic b*] 7” Zz

Q101,102 201,202

Q103,203 ZD301

D304 L101,201 VR101,201 R101,201 R102,103 202.203

R104,204 R105,205 R106,206 R107,207 R108,208 R109,209 R110,210 R111,211 R112,212 R195,295 R319 R357 C102,202 €103,203 C104,204 C105,205 C106,206 C107.207 C108,208 C304 C307 RL301 CN1

BAO05627A

— PB Eq. Amp.

0B06142A | T

0B01872A | T 0B12168A | Z

0B01909A | SiD 0B03919C 0B32009A 0B09741A 0B09330A

OB05631A 0B09731A OB09685A 0B09711A 0B22307A OB22287A OB09673A 0B01888A 0B09703A OBO9677A OB01857A OB09725A 0B09137A | C OB09283A | CC 0B01403A | C 0B01863A | C 0B05832A | C 0B41002A (_C OB05550A | CM OBO9868A | C 0B01400A | C 0B90011A 0B02242A

1C303 Q104,204 L102,202 L103,203 R113,213 R114,214 R115,116

| 117,215 216,217

R118,218 R119,219 R120,220 R121,221 R122,222 R123,223 R125,225 R126,226 R153,253 110,210 111,211 112,212 C114,214 C115,215 C116,216 117,217 C126,226 C160,260 C161,261

1C305 Q112,212 VR102,202 VR103,104

203,204 R127,227 R128,228 R129,229 R130,230 R131,231 R132,135 137,232 235,237

R133,136 233,236

R134,234 R198,298

R

D RD10TS-T1B2 181555

Inductor 36mH Semi-fixed VR 22K RK RK

470K 100K

180K 2.2K 27K

680 10K 12K 1K

a Part No. Description

Main P.C.B. Ass’y

2SC2240 (BL)

R 2SC945L (P,Q) 10V

1/6W J 1/4w J

(Noiseless) 82 1/4

1/6w J 1/6w J 1/6wW J

4.87K 1/6W F 3.32K 1/6W F

1/6wW J 1/4w J 1/6W J 1/6W J 1/4W J 1K

100K 1/6wWJ E 22u 25V (LN)

220P 50V K E 47 16V E 3.34 50V

0.0184 50V J P 390P 100V J

1000P 50V J F 0.iy 50V J

— Rec. Eq, Amp. —

OBO06387A OB06299A OBO0068A OBO6696A 0B09711A OB09701A

OBO09677A | RK 0B09731A OBO9691A | RK OBO9665A OBO9669A 0B09715A | R OBO9697A | RK OB05936A | RK OB09741A | RK 0B01804A 0B40178A OB01862A | CE OBO5659A 0B41186A 0B01412A | CE OBO9866A | C OBO9815A OBO09280A OBO09187A

— Rec, Level —

0B11027A 0B01872A 0B32009A 0B32008A

0B09705A OB22327A OBO9699A OB01888A OBO9707A O0B09701A

OB05629A

OBO9677A 0B09709A

27K 10K 100K

1K 180K 3.9K 330 470 39K 6.8K 10 470K

15K

8.2K 10K 18K 10K

2.7K

1K 22K

100u 16V DS Relay 4P-T Post

IC NJM2043DD TR 2S8C2878 Trap Coil 10.5mH L-C Block RK RK

OB09725A | RK

1/6w J 1/6w J 1/6w J

1/6w J 1/6W J 1/6w J 1/6W J 1/6W J 1/6W J 1/6w J 1/4w J 1/6W J

8900P 50V J 0.47 50V 22u 16V 5600P 50V J 5100P 50V J 10u 16V 0.068u 50V J 47 6.3V (KS) 47P 50V J 1p 16V (BP)

IC TC9145P TR 2SC945L (P,Q) Semi-fixed VR 22K Semi-fixed VR 10K

1/6W J 7.15K 1/6W F

1/6wW J 1/4W J 1/6W J 1/6w J

1/4wW J

1/6W J 1/6W J

ig 355

C121,221 C122,222 C123,223

1C101,201 1C 102,202

OB09725A

OB05571A 0B05843A OBO5659A OB09993A 0B01913A

0B06383A OB06382A 0B10025A

ZD102,202 L104,204 L105,205 R154,193 254,293

R173,273 R174,274 R175,275 R176,276 R178,278 R180,280 R181,281 R182,282 R184,284 R185,285 R186,286 R187,190 287,290

R188,189 288,289

R191,291 R192,194 292,294

R196,296 R340

R358,359 R702,802 C132,134 232,234

C135,235 C136,236 C137,237 C138,140 154,238

C152,252 C153,253 C172,272

1C302 R152,252 R162,262 R163,263 C127,227 C129,229

Q105,106 205,206

30 VR108,208

OBO6167A OB06691A OBO6690A 0B05671A

OBO9687A OB09688A OBO9686A OB22286A 0B22229A 0B09721A 0B22309A OB22265A 0B22305A OBOST17A 0B09722A 0B09737A

0B09739A

OBO09796A OB09709A

0B09723A 0B09330A

OB09725A OBO1679A 0B09494A

0B09312A 0B09240A OBO5652A 0B01412A

OBO9280A OBO09864A OB09862A

OB09868A

OB09570A

OBO9866A 0B09872A 0B09189A OB05687A 0B40054A 0B09191A 0B01400A

— Line Amp.

OBO6146A OBO9677A OBO9709A 0B09702A 0B40076A 0B01412A

— Meter Amp

0B10039A

0B01872A 0B12101A OB06398A 0B06181A

0B32011A

18

— Dolby NR —

Ic Ic TR 2SC945L (PK)

ZD 6.2V RD6.2EB3

100K 1/6W J

680P 50V J 0.012u 50V J 5600P 50V J 820P 50V J 1800P 50V J

TEA0654 TEA0652

L-C Block Yellow L-C Block Blue RK

CF

2.2M 1/4W J

2.7K 3K 2.4K 3.3K 1K 68K 5.1K 2.2K 4.7K 47K 75K 330K

390K

12K 22K

1/6W J 1/6wW J 1/6W J 1/6W F 1/6W F 1/6w J 1/6W F 1/6W F 1/6W F 1/6W J 1/6w J 1/6w J

1/6w J

1/4W F 1/6w J

82K 1/6W J 100K 1/4W J (Noiseless) 100K 1/6W J 100 1/4WJ 1p 50V (LN)

0.01n 100V G 0.0334 100V G 4700P 50V J 10u 16V

47P 50V J 0.047u 50V J 0.033u 50V J

O.1u 50V J

CE 0.15u 50V (LN)

0.068u 50V J 0.22u 50V J 2700P 50V J 1200P 50V J 2200u 6.3V 4700P 100V G 100u 16V

NJM4558DD 1K 1/6w J 22K 1/6WJ 11K 1/6Wd 33u 16V 10pz 16V

2SC1740S (S,E) 2SC945L (P,Q) 65V 5C-1 1SS176 18853

Semi-fixed VR 100K | R633,636 637,640

— Logic —

OBO6178A 0B06214A 0B11020A

OBOG6069A 0B01872A

0B12100A 0B06181A

OBO6689A O0B32007A OBO09749A 0B09725A

O0B09701A

OBO9617A OBO5509A

OB09729A OBO09217A OB09737A OB09711A OBO9695A OBO9663A 0B09672A 0B01854A OBO09699A OBO6706A OBO1679A 0B01933A O0B24007A OBO97TO7A OB09741A

0B06370A OB06299A OBO9685A OBO9697A 0B09725A

OB05579A OBO9677A

0B09049A OB09327A 0B01398A 0B09291A 0B01400A

0B06013A

0B10021A 0B06372A

0B06322A

OBO6066A 0B10034A OB06398A

Ic

Ic

TR TR

TR

TR TR

TR

TR

SiD

Double SiD MC921 siD

33K 100K 560K 150K 100K

56K

22K 10 0.154 50V (LN) 10u 25V (LN) 100u16V

0.022u 50V Z

Ref-No. tee

0B09713A 0B01889A 0B09743A OB09729A OB09725A

OB09719A

OBO9709A OBO9216A OBO9570A OBO9148A 0B01400A

1/6w J 1/4w J 1/6W J 1/6w J 1/6W J

1/6W J

1/6W J 1/4wW J

1/6w J 1/6wW J 1/6w J

1/4W J 1/6w J

1004 16V

uPD4011BC uPD4071BC TMP4315BP- 1814 2SB564 (L,M) 2SC945L (P,Q)

28D1164 (K,L) 2SA953 (K,L)

2SC2002 (K,L)

2SD471 (L,M) 2SC1740S (E)

2SA733 (P,Q)

1SS176

18853

L-C Block Semi-fixed VR 470 RK 1M 1/6w J RK 100K 1/6W J

10K

3.3

150K 5.6 330K 27K 5.6K 270 620 39K 8.2K

R Coil 3.5 100 220

18K 470K

1/6w J

1/6w J 1/4w J

1/6W J 1/4w J 1/6W J 1/6w J 1/6w J 1/6w J 1/6w J 1/4w J 1/6W J

1/4W J 1/4W J 2w J 1/6w J 1/6w J

Schematic Ref. No.

R648 ,649 R652 R653 R654,655 R656 R657 R658 R659 R661

Part No.

OBO9677A

0B01889A 0B01846A 0B09733A 0B05629A OB09705A OB09693A OB09713A 0B09803A 0B09824A 0B09673A OBO09681A 0B24023A 0B01398A 0B01405A

0B40024A 0B01802A 0B09290A 0B40178A OBO09817A 0B02245A 0B02243A 0B81118A

10402 Q401,405 Q402,403 404

ZD401 ZD402 D401 D402 D403,404 406

R403 R404 R405 R406 R407 R408 R409 R410 R411

1K

RK

100K 1/4wJd 4.7K 1/4wJ 220K 1/6wW J 2.7K 1/4wJ 15K 1/6WJ 4.7K 1/6WJ 33K 1/6WJI

R-Network 47Kx5 R-Network 100Kx3 RK 680 1/6W J RK 1.5K 1/6WJ R Fuse 1

220u 16V ip 50V

0.33 50V

0.472 50V

9P-T Post 5P-T Post 2P-T Post

— DC Supply —

OB06380A 0B06322A 0B01872A

OBO6167A 0B06290A OB06282A 0B12100A OBO06398A

0B24006A OBO01857A OBO9671A 0B24007A OB09725A OBO97T07A OBO9695A OBO9665A OB09693A 0B09713A OB09719A 0B40095A 0B01392A 0B01403A OB09292A 0B09799A OB09798A 0B40076A 0B01405A 0B01398A OBO8715A 0B08676B OEOO507A 0E00612A

OEO0857A

— Miscellaneous —

0B60182A 0B81002A OB81010A OB81011A 0B81013A 0B81014A

Ic NJM7812 TR 2SC2002 (K,L) TR 2SC945L (P,Q)

ZD 6.2V RD6.2EB3 ZD 5.6V RD5.6EB2 Diode Bridge DBA10

2200P 50V J 0.01py 50V Z

33u 10V (KS)

Double SiD MC921 SiD 1SS176

560

56K

470u 16V 47g 16V

33u 16V lu 50V 220u 16V

O.1u 50V Z 4700u 25V 6800u 16V

Iw J 1/4W J

1/6W J 1000p 25V

Thermal Fuse 129 Heat Sink Nut Hex. M3

Main P.C.B. Dip Mate 2P Dip Mate 3P Dip Mate 4P Dip Mate 6P Dip Mate 7P

M3x6 @ Pan (2A) ql)

BT 3x6 © Binding (2)

1/6w J 'BAQ5627A-E| Main P.C.B. Ass’y BX-125E

1C305 Q112,212 VR102,202 VR103,104

203,204 R127,227 R128,228 R129,229 R130,230 R131,231 R132,135 137,232 235,237

R133,136 233,236

R198,298 R199,299 R354,355 356,363 364

C119,219 C120,220 C121,221 C122,222 C123,223 C199,299

0B11027A 0B01872A 0B32009A 0B32008A

OBO09705A OB22327A OBO9699A 0B01888A OBO9707A OBO9701A

OB05629A

OBO9709A OB09715A OB09725A

OBO5571A 0B05843A OBO5659A OB05687A 0B01913A OB05653A

— Rec, Level —

Contents of the list is the same as for BX-125 except the following section.

Ic TR

TC9145P 2SC945L (P,Q)

Semi-fixed VR 22K Semi-fixed VR 10K

15K 1/6WJ 7.15K 1/6W F 8.2K 1/6WJ 10K 1/4WJ 18K 1/6WJ 10K 1/6wJd

2.7K 1/4WJ

1/6W J 1/6w J 1/6W J

22K 39K 100K

680P 50V J 0.012u 50V J 5600P 50V J 1200P 50V J 1800P 50V J 1500P 50V J

8. SCHEMATIC DIAGRAM

8.1. IC Block Diagrams

voo AS B84 Y4 Y3 AZ B3

| Al 8! Y1 y2 Az 82 GND

(TOP VIEW)

Fig. 8.1.1 OR Gate C-MOS IC uPD4071BC

Voo A4 84 Ya Y3 AZ B3

Ai Bt Y1 Y2 Az Bz GNO

(TOP VIEW)

Fig. 8.1.2 NAND Gate C-MOS IC uPD4011BC

i Output A +V

Inverting Input A Output B

Non-Inverting Input A

—-Vv

Inverting Input B

Non- Inverting Input B

(TOP VIEW)

Fig. 8.1.3 Operational Amp. IC 4556D, NJM4558DD, NJM2043DD, TLO92

Fig. 8.1.4 Level Meter Driver TA7612AP

wo m r ne O

{Multiple Input Inhibition)

ae m o n

Input Circuit

Uo Sete

Fig. 8.1.5 Analog Switch Selector TC9145P

xOUT

Generctor

Instruction Decoder

1836 Word x@bit

le zlote je Sw [eo jz dele tee FS

(TG)

{10¢)

ROM

IN| O-3 INO 0-3 IN2 0-3

S2 BUS

RAM

64 Word

x 4 bit

INO O— 3: Input Port INO

IN10—3: Input Port IN1 |

100 0-3

IN2 0 — 3: Input Port IN2 OTO 0 — 3: Output Port OTO OT10—3: Output Port OT1 OT2 0 —3: Output Port OT2

OT3 0 — 2: Output Port OT3 100 0 — 3: Bidirectional Port 100 101 0 — 3: Bidirectional Port 101

RST RST: Reset INT: Interrupt

XIN, XOUT: Clock Terminals 101 0-3 arn

Fig. 8.1.6 4-Bit Micro-processor TMP4315BP-1814

19

8.2. Schematic Diagram DOLBY NR SWITCH P.C.B. = — es a Me: _ 7 A = MAIN P.C.B, SS Sw3o6

OV 6 +12v & 5 On R320 8 Fo~s 69 2 (yt

- 3 vasor aot VOKANA2

Output C-® -

Gy) =

C124 0618 SOV.

to Indicator P.CoBe 1C602: proso7iac (LNY RISE VRIO8

33 K 100K Rise 56K D102

c227 R262 Ho | 3 oe

cso TMP431SBP- 1814

100K 330K onte Zo101 Sov RIS4 150K 1Op 16v

MH-34 Flav Q- sez O- +i2v -

o ce +4 m *, ~

0.332 SOV FSS : fee Hi caso § RC4SS6D O ae 6 . 23 Headphone

R 1

nies ed 220nl6v 199 R265 o [R299 u L2mw/8o : R170 7 a R270 @mw/son

2omaks™ = So 2 i) = cd J J &

22K | LN)

Rec.+ Play | -6v |

[Rees # Prey | +12]

0404 Ip 50V

RIGS 100K

o

R27

(fer) fe fry] eae vP-32, = 4 7 ee ET cos oe 2

.

3 = z 1¢601 2 prOsoNAC +i2v +12v

J : f [

4 z y 8 e601 (2/4) 4

U

V ; 8

Tec. Mode i El a 2

3 t s é u

oh 10

tt = :

3, 2 5 sks Baa a 51s a 2 ae 5 3|- R52 . 2 ry Seo 3 3 sre Cas301 ° elec eTé e*c olay Poe

: ; get 2yts “ as : « c-

a :

;

e° 8 2 2 Ce hae +i2v 0603 28 ‘ goo 43 280733 sel : 2 Aso ax be ss es VOLUME PC.B.(I/2)

R6IG

tt mein : 4 os Comi2t

230945(L) 3

Camo) Ale} can 1C303: Nymz04300 © TPIO3 61 Rue

iis eoP) oatysov 1K cus © F 7 1p 16V

tS EP mo

hx = : BS 2 es! 3 s7e? 232 | o fe 7? aoe as eed zs] | 2 : I 32 gs8 . 4 2 ei8s my

Leh id ETco 5 a 3 | ®fo1s 10 7? Line Input 7) feos -_ ejoTs

> Cam(i)

EL SE EE PE TNE |

tezo3 L208 [RecJ-sv |

® Iie 7 | | eee R225 3 l

| ©) OOO et oa Fe-13, Or FC-9 LI

) @)

iT I es Sw6ol 1 Or

t 1 oP

oO ss oO

Rec

TIMER SWITC

Host isl = ron bo oe = O-OxX | a) oe ae ee

Ege Reh

‘AI33 267K

‘VRIO3 10K

ong 2scoasttr

Lehn (3)

Line Output

Reh (9) "100K

104 2sc2e7e

C261 cat

R228 C220

R220 C223 R237

C2t? R223 +4.5V

R230 YR202

Raz C24

Rio IDS

Len ® VW a Record /Playback dS Hy , Head oH} . 3] Bae to Indicator

Reh > , | 0 PeCoBe 4 aC) :

TP202 $6) rrioz

206 R208

a

Hi f a5 oe Ey Bee

saiT i 9 ite. z a eee | | :

: ¢ rarer : ba on [Mex] 120ys, 22 H A 2 sat, 2 g “" a8 al 3 if |" api Hoe an

eas J i O i mee R207 3 45 oy! | 3 6 3 3 4 i} é Z 2 baa 2° be 2 ? i t

Notes: 1. Diode is 18853, 181555, or 1SS176 unless otherwise specified. Fe Brak» swe soe re LL] 8 fe) Gel Ped fee] Ge) f=] FE) Ge) Gel Gel” ee] 2. 2SA733, 2SA608SP, 28A1048 and 2SA1175 are interchangeable with each other. To ROM IES OF Pearse ott nm CONTROL SWITCH PCB, 8. 2SC945, 2SC536SP, 2SC2458 and 2SC2785 are interchangeable with each other. 6 se 3 rome Sah] eae Ye] = _

4TK che 220p 1] Fig. 8.2

20 TAPE SWITCH PCB

SS oes LS,

to Indicator PoCoBe Tceo2: yPOSOTIBC

601 0.01n Reel Motor C602 0.01y Control Motor 28citeos Resz 6)

Real Cam Switch Operction 100K

3 C602: yPD4071IBC ae sv\ 34 moe 3 Ps 16602 (4/4) pea asez002

“Al : 2 : a) Com(2)

phone wen w/S50n I Comtt)

xtor Rew Mode Rec. Protector

ee g Counter "000"

Ams o 3 —— NS i ie 2eceooe §

eee 26ie Wemery 28733 Acew.

Aptay

Tree. oes Controt 2sc200z (eter)

: 2

+i2v a O 3

= Co 9603 asaras ely A Feoz corer SWITCH

g tox ar A — eo 100K

# y oe Q604 3

2sceasit) 3 ~6Vv

jot © I Cami) Op 16¥ ig s|

a R25 Ey tH fy ieev)

gs 6.8K 2 | = I $ | aa U.S.A., CANADA & JAPAN

<3 2 aa HLT acess sepa ness ( prex-i2s $s aige HHH ee: (Aastrotie) & 33 exiese

: "s ae 4 ll i Lo

mi2zi Cw. 330 656007) Oc

S101

Lioz (0.5m : a]

20 [rec] -6v | er, 7 fe lrev

R225 eg |

| © ; 12 oar) Orn ters ie

[Arts :

a 7 open TIMER SWITCH P.C.B,

FC-8

FC. ~~) ==

i

a m2zt cats

C2? Rees 2 i

(\) a

cas | ™

L202 c260 4

es tH

L

Clit a ‘

from Main PeCeBe

tes! TAT6IZAP VOLUME P.C.B.(2/2)

ae ae

coh ec ps ©®

Ba .C.B.

ee, ws Ww

ear 13

tcl ; Heh IE

Be ee oS ibis & Gi | fy ne |

Fig. 8.2

i trom Main P.C.B,,

“a

‘SWw707 sw

a7or z ‘25A9338; ?

a ree 100K

a R705

ys

?

LEO7OI R701 150

as Y | R708

Leoroz ZO [a

% LEo705

Lep706 0 705 tree sw7or oeiee

RTI 100K

ATI3 330K to Velume P.C.8. aay

Oe A eee

L. AUSTRALIA _|

AC Input

aS POWER SWITCH PC.B.

120V—<—"220V-240V OTHER VERSION

Warning: Parts marked with the symbol

istics, Use ONLY replacement parts recommended by the manu-

facturer. It is recommended that the unit be operated from a

suitable DC supply or batteries during initial check-out proce-

dure,

have critical character-

Caution: Before returning the unit to the customer, make sure you

make either (1) a leakage current check or (2) a line to

chassis resistance check. If the leakage current exceeds 0.5 milliamp, or if the resistance from chassis to either side of

the power cord is less than 240 k ohms, the unit is defective. WARNING — DO NOT return the unit to the customer until the problem is located and corrected.

9. WIRING DIAGRAM

Power

| Transformer

nput

| I

8LKk { to Main PCB! Assy l

! | I

Transformer

Transformer

Ll 220V CLASS 2 (220V)

Voltage Selector

Notes: 1 Table of wire colors

BRN — Brown BLU — Blue RED — Red VIO — Violet ORN — Orange GRY — Gray

YEL — Yellow WHT — White

GRN — Green BLK — Black

2. Component side view of the P.C.B. is illustrated unless otherwise specified.

3. Wire tube color is shown in (_ ).

pocccccccccccc ee

BLK AC Input

; 1 4 MM- 1

. Fc-8

GRY’ [V10_ |} WR

IGRY_Y REC

= CLLR wR

JERE us ee A AS

Power Switch P. C.B. Assy

U.S.A. & CANADA(120V) (JAPAN (I00V)) J

rz) Bey tl

: BLK a

oe foosse]s

Mechanism : : Record Protector

Eject Switch Switch

Shut-off P.C.B. Assy (Dip Side) =

Cam Switch

[990009]

WHT

GRY

GRN RED

' f

& oy

Capstan Motor

'

'

i) i]

Reel Motor

Timer Switch Tape Counter P.C.B. Assy Switch

a FC-

Erase Head Record/ Playback Head 7

ee o> ee |= i a mY)

i]

WHT (BLK} Pt RF

= Solana Display Unit Indicator P.C.t

Headphone P.C.B. Assy P

Jack é

Fig. 9

d > a= WHT (BLK)

Control Switch

P.C.B. Assy

BEEEREEEE re

g |o00000000

Main P-C.B. Assy

Tape Counter Switch

Display Unit

Fig. 9

Indicator P.C.B. Assy

Chassis

(BLK)

Volume PC.B.

Chassis

Dolby NR Switch PC.B.

WHT (GRY)

Chassis

WHT (GRY)

Pin Jack

Tape Switch PC.B. Assy

21

BLOCK DIAGRAMS 10.

Amplifier Section 10.1, P

(43uT

(aPO ‘MU 22) =

(usu)

NODE

avoysp day

!

‘dwy suoydpoay

(apo ‘Awoos?

and ing

aury ®

MA Inding

alow

INO Bd

uowras

sa19W

| 8Aa7

e 7O21U0D

a4

284

aappo4

“dwy

euiy

22100

[aay

Jaay

©

(7HOOt

‘BPO

AwOoSE) (lO%d

1}

sOldL

<ore

te cp ec

ome 4

Pal o

& !

rae

3 tot i

| bb

ott

on

31 I

| fe

*

1299 8d

| | fp

}

| “duy

D3 ad I

|

Pe

| o

I 1

4 |

O

| 21-MS

1

! ©

,inuos) 3

t 1

!

I 1

induy aury

: !

| L

4 .

pee x3

@

|

-—

BA 12A27

204 soos an

EL La

H

ae r

Tt it Ett

dt z)

Hoe

xz ©

[2404] |

wi

oH

(z0zd 1) © — -dwy

3

“204 409 “204

I qJ

CJ

| 20tdL

(eozaL) £OldL

| |

at PDaH

@S013 {

CD

[2se1} 440/879

wones UN

Ka10g |

Cd

3

kati o

IOP

ao

ap ere rr e ee

S|

a

a

o—4xs

@ o

xz @

2 mn

NO

N

i} o

2HxSOL $

xdW

01499 "950 SDIG

w2s08 FF Pte

22

JOjOW UdISdDD

oz90

(%)

440 Jamog

(z)up9 a

a)

(4)wo9

_

uodag

Aiddns

samo,

ind!

eee

: iS

4aMOg

30

[zemog]

—

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YOII

MS

UOLIS0g

WOD

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Joos JOJOW J02)U0D

Serena raee (Sh Fee (0 Ceo) eer Yemen

| i | I | t { I | I I | } |

Josow

1014U0>

| | I | l I I I | ! 1 I I |

Oe 54

2

pa

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2

s

JOJOW

1994

losjues

ep

JOJOW

[aay

\

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4 \

ves

|

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HO-INUS

|

\!

!

1

gil

431408

asing

$0

inys

|

1

iI

|

sosuas

{

®att

Ho-

nus

LS

==4

|

[2aa]

\

et

:

4

i

G31

YouiMs

jou4u0D

_ a —

bse meee Lg Uoljaag

Wwsi

uoYo

ow

‘s fis

40$$890J0

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029

JO2}U0D

wWSIUDYyIay

£0991

a

dps

Mechanism Control Section 10.2,

Fig. 10.2

ie) N

11. TIMING CHART AND EQ. AMP. FREQUENCY RESPONSE

11.1. Timing Chart (1) Overall Timing Chart Playback Record

Mode

Stop Play Rec./Pause! Rec./Play Stop

Reel Motor : ee ee looms

(Tape) 440ms

Line Mute

( Output) 600ms

300ms —~

Bias

Rec. Mute 400ms

Fig. 11.1.1

(2) Mechanism Control Timing Chart

Control Button Play Pause Rec./Play Rew, FF. Play Tape End

y y

ose sion] ror | frou] [ree] [ree] oof e| fy [re] [sm FWD

Control Cam Motor

REV

ON Camto am{) OFF

Cam Position Cami!) ON

Switch OFF ——t

camiz) ON ome" OFF

eee FWD

Reel Motor

REV

Capstan Motor OFF

4) Fig. 11.1.2

24

11.2. Eq. Amp. Frequency Response

(1) Playback Frequency Response

GAIN (dB)

FREQUENCY (Hz}

Fig. 11.2.1

(2) Record Current Frequency Response

GAIN (dB)

FREQUENCY (Hz)

Fig, 11.2.2

25

12. SPECIFICATIONS

Track Configuration .......... 4 Tracks/2-Channel Stereo

Headss 2:5 gaat Pe eet Pha awed 2 (Erase Head x 1, Record/Playback Head x 1) Motors (Tape Transport) ....... DC Servo Motor (Capstan Drive) x 1

DC Motor (Reel Drive) x 1 Power Source...........---- 100, 120, 120/220-240, 220 or 240 V AC; 50/60 Hz

(According to country of sale)

Power Consumption .......... 23 W max.

Tape Speed ...........-.006% 1-7/8 ips. (4.8 cm/sec.) £0,5%

Wow and Flutter ............ Less than +0.11% WTD Peak

Less than 0.06% WTD RMS

Frequency Response .......... 20 Hz—20,000 Hz (recording level —20 dB) Signal to Noise Ratio. ......... Dolby C-Type NR on <70 us, ZX tape>

Better than 68 dB (400 Hz, 3% THD, IHF A-WTD RMS)

Dolby B-Type NR on <70 us, ZX Tape> Better than 62 dB (400 Hz, 3% THD, IHF A-WTD RMS)

Total Harmonic Distortion ...... Less than 1.0% (400 Hz, 0 dB, ZX, EXII tape) Less than 1.2% (400 Hz, 0 dB, SX tape)

Brasure ......... 00 eee eeee Better than 60 dB (100 Hz, 10 dB)

Separation. ...........2000- Better than 36 dB (1 kHz, 0 dB)

Crosstalk. 2... ee ee Better than 60 dB (1 kHz, 0 dB)

Bias Frequency ............. 105 kHz

Input (Line) ............... 50 mV, 30 kQ

Output (Line) .............. 0.5 V (400 Hz, 0 dB, output level control at max.) 2.2 kQ

(Headphones) ......... 2.2 mW (400 Hz, 0 dB, output level control at max.) 8 2 load

Fast-Winding Time ........... Approx. 85 seconds (with C-60 cassette) Dimensions ...............-- 430 (W) x 100 (H) x 250 (D) millimeters

16-15/16 (W) x 3-15/16 (H) x 9-7/8 (D) inches Approximate Weight .......... 5 kg

11 Ib.

@ Specifications and appearance design are subject to change for further improvement without notice. @ Noise Reduction System manufactured under license from Dolby Laboratories Licensing Corporation. @ The word ‘‘DOLBY” and the Double-D-Symbol are trademarks of Dolby Laboratories Licensing Corporation.

26

Service Manual

Nakamichi BX-125,BX-125E

Nakamichi Corporation Tokyo Office

Shinjuku Daiichi Seimei Bldg.

2-7-1 Nishishinjuku, Tokyo

Phone (08) 342-4461

Telex : 2324721 (NAKAM J)

Nakamichi U.S.A. Corporation ; 19701 South Vermont Avenue

Torrance, California 90502

Phone : (213) 538-8150

Nakamichi GmbH Stephanienstrasse 6, 4000 Diisseldorf 1

! Phone : (0211) 359036 0-850410A Printed in Japan