BC-119 BC-121 Service Manual

7/25/2019 BC-119 BC-121 Service Manual

1/19

DESKTOP CHARGER

bc-119nMULTI-CHARGER

bc-121n


2/19

INTRODUCTION

This service manual describes the latest service information

for the BC-119N DESKTOP CHARGER/BC-121N MULTI-

CHARGER at the time of publication.

MULTI-C

HARGER

VERSIONSModel Version Symbol Supplied batt . adap. AC adapter

DANGER

NEVER connect the charger to an AC adapter or a DCpower supply that uses more than 20 V (BC-121N: 16 V).

Such a connection could cause a fire hazard and/or electric

shock.

DO NOT expose the chager to rain, snow or any liquids.DO NOT expose the chager to rain, snow or any liquids.DO NOT reverse the polarities of the power supply whenconnecting the charger.

ORDERING PARTS

Be sure to include the following four points when ordering

replacement parts:

1. 10-digit order numbers2. Component part number and name

3. Equipment model name and unit name

4. Quantity required

8010018700 Case BC-119N Chassis 5 pieces8810008660 Screw B0 3x8 NI-ZU BC-119N Chassis 8 pieces1110004700 S.IC S-80847ALNP-EEB BC-121N MAIN-A UNIT 1 piece8810008660 Screw B0 3x8 NI-ZU BC-121N 1800 cover 8 p ieces

Addresses are provided on the inside back cover for yourconvenience.

Make sure a problem is internal before disassembling

the charger box.

DO NOT open the chassis until the charger is dis-

connected from its power source.

DO NOT force any of the variable components. Turn

them slowly and smoothly.

DO NOTshort any circuits or electronic parts. An insulat-

ed tuning tool MUSTbe used for all adjustments.

DO NOTkeep power ON for a long time when the charg-er is defective.

READ the instructions of test equipment thoroughly

before connecting equipment to the charger.

1.

2.

3.

4.

5.

6.

REPAIR NOTES

U.S.A.

BC-119N

BC-121N

Europe

Australia

UnitedKingdom

General

General

[USA]

[USA-1]

[EUR]

[EUR-1]

[AUS]

[AUS-1]

[UK]

[UK-1]

[GEN]

[GEN]

[GEN-1]

AD-75BC-145A

BC-145E

BC-145V

BC-145UK

AD-75

AD-75

AD-75

AD-75


3/19

TABLE OF CONTENTS

SECTION 1 SPECIFICATIONS

SECTION 2 CIRCUIT DESCRIPTION

2-1 DC-DC CONVERTOR CIRCUIT (STEP-UP/DOWN CONVERT

2-2 CONSTANT-CURRENT CIRCUIT .............................................

2-3 REGULATOR CIRCUIT .............................................................

2-4 CHARGING CURRENT AND VOLTAGE CHART .....................

2-5 CPU PORT ALLOCATIONS .....................................................

SECTION 3 ADJUSTMENT PROCEDURES

SECTION 4 PARTS LIST

SECTION 5 MECHANICAL PARTS AND DISASSEMBLY

5-1 BC-119N ....................................................................................

5-2 BC-121N....................................................................................

SECTION 6 SEMI-CONDUCTOR INFORMATION

6-1 TRANSISTORS .........................................................................

6-2 DIODES.....................................................................................

SECTION 7 BOARD LAYOUTS

SECTION 8 BLOCK DIAGRAM

8-1 BC-119N ....................................................................................

8-2 BC-121N....................................................................................

SECTION 9 VOLTAGE DIAGRAM

9-1 BC-119N ....................................................................................

9-2 BC-121N....................................................................................


4/19

SECTION 1 SPECIFICATIONS

BC-119N

Power supply requirement : 12 V to 20 V DC (negative ground)

Dimensions (projections not included) : 115(W)60(H)103(D) mm; 4 12(W) 2 14(

Weight (adapters not included) : 200 g; 7.1 oz; 0.4 lbs

BC-121N

Power supply requirement : 12 V to 16 V DC (negative ground)

Dimensions (projections not included) : 300(W)93(H)197(D) mm; 11 1316(W) 3

Weight (adapters not included) : 1.4 kg; 49.4 oz; 3.1 lbs

COMMON

Rapid charging current : 840 mA 10 %670 mA 10 %540 mA 10 %420 mA 10 %

Trickle charging current : 30 mA 10 %

Constant voltage (Lithium-ion battery) : 8.4 V 0.1 V

Electrostatic durability : Air discharge 8 kVContact discharge 4 kV

Usable temperature range : +10C to +40C; +50F to +104F

Rapid charging time : 12 hours.

All stated specifications are subject to change without notice or obligation.


5/19

SECTION 2 CIRCUIT DESCRIPTION

2-1 DC-DC CONVERTOR CIRCUIT(STEP-UP/DOWN CONVERTOR)

The DC-DC convertor circuit regulates the charging voltagefrom an AC adapter or a power supply to appropriate valuesfor various battery pack.

The applied voltage from an AC adapter or a power supply isregulated at the step-up and down convertor circuit (Q5, D6,D7, L2). The regulated voltage is passed through the con-

stant-current circuit.

STEP-DOWN CONVERTOR CIRCUIT

The step-down convertor circuit activates when the chargingvoltage is lower than the applied voltage from an AC adapteror a power supply.

The applied voltage is chopped (turn ON and OFF) by the

step-down convertor circuit. The chopper voltage (squarewave) is passed through the smoothing circuit (C26) for con-version to DC voltage.

The step-down convertor circuit is controlled by the CPU(IC2) via the swtching regulator (IC5, Q8, Q9) and driver (Q3,Q4, D4, D5) circuits.

STEP-UP CONVERTOR CIRCUIT

The step-up convertor circuit activates when the chargingvoltage is higher than the applied voltage from an AC adapteror a power supply.

The voltage passed through the step-up convertor circuit ischopped by the step-up convertor circuit.

Q5 is composed of two FETs (FET1 is pins 14, FET2 is pins58). While FET2 is turned OFF, the same voltage as theapplied voltage is output from the step-up convertor circuit.

However, while FET2 is turned ON, stored energy at the coil(L2) is driven into flywheel diode (D7). In other words, a backelectromotive force occurs when FET2 is turned ON. Thiselectromotive force is used for the step-up voltage.

2-2 CONSTANT-CUThe constant-courrent circcircuit (Q5, D6, D7, L2), IC4

The current detector circuit and generates a voltage igenerated voltage is applie(IC4a, pin 2).

The amplified voltage is apthe swtiching regulator (IC5PWM signal from pin 2 to signal is applied to the ICR32, C35) to convert to Dapplied to the swtiching regThe output current from spasses through the R44 anage. The output voltage is aD5), and then applied to

obtain constant current.

2-3 REGULATOR CPart of voltage from an ACapplied to the 1st regulator V voltage signal. The 12 V sand buffer amplifier (IC4b, p

Part of 12 V signals are ap(IC1, R25) to convert to theV signal is applied to the CP(IC3, pin 2), etc.


6/19

2-5 CPU PORT ALLOCATIONS (IC2)

2-4 CHARGING CURRENT AND VOLTAGE CHART

Pinnumber

2

5

12

Portname

PWM

CURRENT

AD-101

Description

Outputs DC-DC convertor control sig-nal. The signal is applied to the Q8 asPWM signal.

Input port for current detector A/D sig-nal.

Input port for adapter select signal.

IC2 pin number Rapid chargingcurrent12

AD-101

Low

Low

Low

High

High

High

HighHigh

High

High

High

High

High

High

High

High

High

High

High

High

High

HighHigh

15

SW

High

Low

High

High

Low

High

HighHigh

High

High

High

High

Low

High

Low

High

High

Low

High

High

Low

HighHigh

16

BIT1

Low

High

High

Low

High

High

HighLow

High

Low

Low

High

Low

Low

High

High

Low

High

High

Low

High

HighHigh

17

BIT2

Low

High

High

Low

High

High

LowHigh

Low

High

Low

Low

High

High

High

High

Low

Low

Low

High

High

HighHigh

18

BIT3

High

High

High

High

High

Low

HighHigh

High

High

Low

Low

Low

Low

Low

Low

High

High

High

High

High

HighHigh

26

BIT4

Low

Low

Low

Low

Low

Low

LowLow

High

High

High

High

High

High

High

High

High

High

High

High

High

HighHigh

(mA)

840

840

840

840

840

840

670420

540

420

670

670

840

420

670

840

540

420

840

840

670

540

27

BC-79

High

High

High

High

High

Low

LowLow

Low

Low

High

High

High

High

High

High

High

High

High

High

High

HighLow

28

BC-119

Low

Low

Low

Low

Low

High

HighHigh

High

High

High

High

High

High

High

High

High

High

High

High

High

HighHigh

b

Do not oper


7/19

5-1 PREPARATION REQUIRED TEST EQUIPMENT

SECTION 3 ADJUSTMENT PROCEDURES

EQUIPMENT

DC power supply

GRADE AND RANGE

Output voltage : 12 V 20 V DC

Current capacity : 1 A or more

EQUIPMENT

DC voltmeter Input impe

Output lev

5-2 TRIMMER ADJUSTMENT

REFERENCE

VOLTAGE1 Connect the power supply or AC

adapter to the J1.MAIN Connect a DC volt-

meter to the checkpoint CP4.

ADJUSTMENT ADJUSTMENT CONDITIONSUNIT LOCATION

MEASUREMENT

CP4

Reference voltage check

R25Reference voltage adjustm

12 12

[BC-121N ONLY]:Same adjustment as step 1 for MAIN-AMAIN-F units.

MAIN UNIT TOP VIEW


8/19

IC1 1110005350 S.IC NJM2870F05-TE1IC2 1140010280 S.IC PD789112AMC-512-5A4IC3 1110004700 S.IC S-80847ALNP-EEB-T2IC4 1110005330 S.IC NJM12904V-TE1IC5 1110003070 S.IC PC494GS-E1

Q1 1520000460 S.TRANSISTOR 2SB1132 T100 R

Q3 1530002060 S.TRANSISTOR 2SC4081 T107 RQ4 1510000510 S.TRANSISTOR 2SA1576A T106RQ5 1590003070 S.FET UPA1890GR-9JG-E1Q6 1510000510 S.TRANSISTOR 2SA1576A T106RQ7 1510000510 S.TRANSISTOR 2SA1576A T106RQ8 1530002060 S.TRANSISTOR 2SC4081 T107 RQ9 1530002060 S.TRANSISTOR 2SC4081 T107 RQ10 1590000430 S.TRANSISTOR DTC144EUA T106Q11 1590000430 S.TRANSISTOR DTC144EUA T106Q12 1590001190 S.TRANSISTOR XP6501-(TX) .AB

D2 1160000070 S.DIODE DAN202K T146D3 1160000070 S.DIODE DAN202K T146D4 1750000550 S.DIODE 1SS355 TE-17D5 1750000550 S.DIODE 1SS355 TE-17D6 1790000680 S.DIODE SB20-03P-TDD7 1790000680 S.DIODE SB20-03P-TDD8 1750000550 S.DIODE 1SS355 TE-17

X1 6060000790 S.CERAMIC CSTCR4M91G

L1 6200007660 S.COIL LL1608-FHR10JL2 6190001150 COIL HK-08S050-2010

R1 7030000380 S.RESISTOR MCR10EZHJ 1 kR2 7030000380 S.RESISTOR MCR10EZHJ 1 kR3 7030003520 S.RESISTOR ERJ3GEYJ 472 V (4.7 k)R4 7030003320 S.RESISTOR ERJ3GEYJ 101 V (100 )R5 7030003320 S.RESISTOR ERJ3GEYJ 101 V (100 )R6 7030003520 S.RESISTOR ERJ3GEYJ 472 V (4.7 k)R7 7030003410 S.RESISTOR ERJ3GEYJ 561 V (560 )R8 7030003410 S.RESISTOR ERJ3GEYJ 561 V (560 )R9 7030003200 S.RESISTOR ERJ3GEYJ 100 V (10 )

R10 7030003410 S.RESISTOR ERJ3GEYJ 561 V (560 )R11 7030005501 S.RESISTOR ERA3YKD 124VR12 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 k)R14 7030005981 S.RESISTOR ERA3YED 333VR15 7030007230 S.RESISTOR ERA3YED 102VR16 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 k)R17 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 M)R18 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 k)R19 7030005671 S.RESISTOR ERA3YKD 393V

R42 7030003560 S.RESISTORR43 7030003690 S.RESISTORR44 7030005501 S.RESISTORR45 7030005981 S.RESISTORR46 7030003440 S.RESISTORR47 7030003520 S.RESISTORR48 7030003360 S.RESISTORR49 7030000380 S.RESISTOR

R50 7030003640 S.RESISTORR51 7030003570 S.RESISTORR52 7030003580 S.RESISTORR53 7030003760 S.RESISTOR

C1 4030006900 S.CERAMICC3 4030006900 S.CERAMICC4 4510004630 S.ELECTROLYC5 4030006900 S.CERAMICC6 4030011600 S.CERAMICC7 4030006900 S.CERAMIC

C8 4030006900 S.CERAMICC9 4510005430 S.ELECTROLYC10 4510007920 ELECTROLYC11 4030006900 S.CERAMICC12 4030006900 S.CERAMICC13 4030011600 S.CERAMICC14 4030006900 S.CERAMICC15 4030006900 S.CERAMICC16 4030006900 S.CERAMICC17 4030006900 S.CERAMICC18 4030006900 S.CERAMICC19 4030006900 S.CERAMICC20 4030006900 S.CERAMICC21 4030006900 S.CERAMICC22 4030006900 S.CERAMICC23 4030011600 S.CERAMICC25 4030006900 S.CERAMICC26 4510007920 ELECTROLYC27 4030006900 S.CERAMICC28 4030006900 S.CERAMICC29 4030006900 S.CERAMICC30 4030006900 S.CERAMICC31 4030011600 S.CERAMICC32 4030006900 S.CERAMICC33 4030006860 S.CERAMIC

C34 4030006900 S.CERAMICC35 4510005430 S.ELECTROLYC36 4510005430 S.ELECTROLYC37 4030006860 S.CERAMICC38 4030011600 S.CERAMICC39 4030006900 S.CERAMICC40 4030006900 S.CERAMICC41 4030011600 S.CERAMICC42 4030006900 S.CERAMIC

SECTION 4 PARTS LIST

REF ORDERDESCRIPTION

NO. NO.REF ORDERNO. NO.

[MAIN UNIT] [MAIN UNIT]


9/19

SECTION 5 MECHANICAL PARTS AND DIS

MAIN

UNIT

MP1

MP2

MP3

MP3 MP4

MP4

E

*Plug types are

5-1 BC-119N


10/19

W1

MP2

MP5

MP5

MP7

MP7MP7

MP4

MP8

MP4

MAIN-AUNIT

MP3

MAIN-B

MAIN-D

MAIN-E

MAIN-F

MAIN-C

MP1

5-2 BC-121N


11/19

SECTION PARTS LISTSECTION 6 SEMI-CONDUCTOR INFORMAT

6-1 TRANSISTORS

DTC144EU 26

B E

C

NAME SYMBOL INSIDE VIEW

2SB1132 R BARB

B E

C

C

UPA1890 GR A1890

D1 S1 S1

S2 S2

G1

G2D2

1 4

8 5

2SA1576 R AEG

C

B E

2SC4081 R BR

B E

C

6-2 DIODES

NAME SYMBO

1SS355 A

SB20-03P SC

DAN202K N


12/19

BIT2

BIT1

SW

CURR

TEMP

CHARGE

BC-119

M1VO

AD-1011

to ADAPTORMAIN UNIT (COMMON)

SECTION 7 BOARD LAYOUTS

TOP VIEW


13/19

BOTTOM VIEW


14/19

SECTION 8 BLOCK DIAGRAM

MAIN UNIT

DC-IN1 2

Q1 : 2SB1132Q12: XP6501

F1J1

1st REG.

UP/DOWNCHOPPERREG.Q5: UPA1890

D6, D7: SB20-03PL2

Q3: 2SC4081Q4: 2SA1576D4, D5: 1SS355

DRIVERINPUT SEL.

Q6, Q7: 2SA1576

INPUT VOLTAGE BATT TEMP.

to ADAPT

BATT VOLTAGE1

BATT VOLTAGE2

SEL. CTRL

Vin/TEMP

SW REG.

IC5: PC494GSQ8, Q9: 2SC4081

PWM

DTC

CPU

2nd REG.IC1: NJM2870R25

5.15 V

RESET

VOLTAGEDETECT

IC3: S-80847ALNP

LED

DS1

IC2 :PD789112AMCCURRENT

BATT TYPECERAMICRESONATOR

4.91 MHz

IC4

8-1 BC-119N


15/19

MAIN-A UNIT

MAIN-B UNIT

DC-IN

W1(OPC-1161)

1 2

Q1 : 2SB1132Q12: XP6501

F1J1

1st REG.

UP/DOWNCHOPPERREG.

Q5: UPA1890D6, D7: SB20-03PL2

Q3: 2SC4081Q4: 2SA1576D4, D5: 1SS355

DRIVERINPUT SEL.

Q6, Q7: 2SA1576

INPUT VOLTAGE BATT TEMP.

BI

BATT VOLTAGE1

BATT VOLTAGE2

SEL. CTRL

Vin/TEMP

SW REG.

IC5: PC494GSQ8, Q9: 2SC4081

PWM

DTC

CPU

2nd REG.IC1: NJM2870R25

5.15 V

RESET

VOLTAGEDETECT

IC3: S-80847ALNP

LED

DS1

IC2 :PD789112AMC

CURRENT

BATT TYPECERAMICRESONATOR

4.91 MHz

X1: CSTCR4M91G

J1

J1

IC4:

to ADAPTO

8-2 BC-121N


16/19

SECTION 9 VOLTAGE DIAGRAMS

IC1 NJM2870Q12XP6501

Q12SB1132

Q42SA1576

Q10DTC144EU

Q3 2SC4081

Q5

UPA1890

IC5 PC494GS

Q82SC4081

Q92SC4081

R1433k

C230.1

R2739k

C220.01

R1210k

R11120k

R1610k

1 2 3 4

5678

12V

L10.1

C340.01

R298.2k

R34.7k

R53470k

R5112k

C410

1 2 3C50.01

R261.5k

R25100

C310.1

C70.01

C80.01

CTRL

GND

NB

VIN

VOUT

1

3

2

4

55.15V

C922

CP4

R48220

R5215k

12V

R2833k

6 5 4

C320.01

C330.001

C430.01

C440.01

C450.01

C3522

R331k

R3622k

C3622

C370.001

R3756k

C400.01

C410.1

R4533k

C10470

C110.01

R8560

D41SS355

R10560

R491k

C250.01

C26470

D6SB20-03P

L2HK-08S050-2010

D7SB20-03P

D1

S1

S1

G1

D2

S2

S2

G2

1

2

3

4 5

6

7

8

R910

R7560

D51SS355

R44120k

C390.01

R4056k

R41560k

R4210k

16

15

14

13

12

11

NO-INVIN

INVIN

REFOUT

OC

VCC

C2

E2

E1

NO-INVIN

INVIN

FB

DTC

CT

RT

GND

C1

10

9

1

2

3

4

5

6

7

8

R354.7k

R3422k

R43120k

R3222k

F2S-N5051

F3S-N5051

F1FGB 2AJ1

1

2

C380.1

R3822k

R39560k

C210.01

11.8V

15.6V

46.4 s

46.4 s

8.6V

7.9V

0.4V

3.8V

9-1 BC-119N


17/19

ICS-

IC2PD789112AMC

Q11DTC144EU

Q62SA1576

Q72SA1576

IC4NJM

IC1NJM2870

Q12XP6501

Q12SB1132

Q42SA1576

Q10DTC144EU

Q3 2SC4081

Q5UPA1890

IC5PC494GS

Q8

2SC4081

Q92SC4081

15.6V

46.4 s

46.4 s

8.6V

7.9V

0.4V

M

C60.1

C20.0

R151k

R1433k

C230.1

R2739k

C220.01

C13

1

2 OU

Me In W

VD

C12CP1X1CSTCR4M91G

P231

P242

P253

AVDD4

ANI05

ANI16

ANI27

ANI38

AVSS9

IC010

P5011

P5112

P5213

P5314

P0015

RXD 30

TXD 29

P20 28

P11 27

P10 26

VDD 25

VSS 24

X1 23

X2 22

IC0

21

IC0 20

RESET 19

P03 18

P02 17

P01 16

C30.01

C300.01

R5 100

R4 100

R311M

DS1VRPG3349S-734

GND

RXD

TXD

RESET

VDD

VPP

R11k

R21k

R301M

R5047k

D2DAN202K

D3DAN202K

CP2

CP3

R1210k

R11120k

R16 10k

12V

D81S

1 2 3 4

5678

L10.1H

C340.01

R298.2k

R34.7k

R53470k

R5112k

C410

1 2 3C50.01

R261.5k

R25100

C310.1

C70.01

C80.01

CTRL

GND

NB

VIN

VOUT

1

3

2

4

55.15V

C922

CP4

R48220

R5215k

R2833k

6 5 4

C320.01

C330.001

C430.01

C440.01

C450.01

C3522

R331k

R3622k

C3622

C370.001

R3756k

C400.01

C410.1

R4533k

C10470

C110.01

R8560

D41SS355

R10560

R491k

C250.01

C26470

D6SB20-03P

L2HK-08S050-2010

D7SB20-03P

D1

S1

S1

G1

D2

S2

S2

G2

1

2

3

4 5

6

7

8

R910

R7560

D51SS355

R44

120k

C390.01

R4056k

R41 560k

R42

10k

16

15

14

13

12

11

NO-INVIN

INVIN

REFOUT

OC

VCC

C2

E2

E1

NO-INVIN

INVIN

FB

DTC

CT

RT

GND

C1

10

9

1

2

3

4

5

6

7

8

R35

4.7k

R3422k

R43120k

R3222k

F2S-N5051

F3S-N5051

F1FGB 2A

C380.1

R3822k

R39 560k

C210.01

C10.01

11.8V

3.8V

4.915 MHz

3.3V

J1

1

2

3

1

2

1

2

3

9-2 BC-121N


18/19

Count on us!


19/19

S-13810MZ-CD-1 2001 Icom Inc.1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan

Count on us!

BC-119 BC-121 Service Manual

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