Handy Wiring Guide B3 C3 - Hammond X66 Organ Club · B3/C3 Handy Wiring Guide B3/C3 May .2015...

B3/C3 Handy Wiring Guide B3/C3 May .2015 Hammond Vintage dan.vigin

Hammond Vintage

by Dan.Vigin

Handy Wiring Guide for B3/C3 TWG

Hammond ® and Leslie ® are registered trademarks of Suzuki Musical Instru ment Manufacturing Co. Ltd.

Binche / Belgium May 2015


Table of contents. 1. Forewords and Purpose. P. 3 2. TWG to keyboards wiring concept P. 4 3.1 Table #1 – Legend (glossary) P. 6 3.2 Table #2 – Wiring to Upper and Lower keyboards P. 7 3.3 Table #3 – Wiring to Pedal keyboard P. 8 4. Another way to proceed P. 9 5. Other surrounding wiring P. 9 7. My conclusion P.10 Appendix #1 – Hammond Note Nbr/'Key' Ref./Related f requency


" Handy Wiring Guide for B3/C3 TWG " 1. Forewords – Purpose of this article. It happens during the B3/C3 lifetime that upper and lower keyboards assembly have to be pulled out from the cabinet and put on the workbench for several reasons such as :

- removing black caustic foam - replacement of contacts - dendrites cleaning - dead note, - open tapering leads, - and there are more...

Less frequently, similar problems may also appear at pedal keyboard. In any case, all wirings from TWG (*) to keyboards have to be unsoldered. Inversely, same situation may be encountered if TWG has to be removed out from the cabinet in case of coil pick-up replacement f.i. and the like. When remounting, there is absolutely no room for any wiring error. Since all cables are laced and black coloured, during re-soldering, it's sometimes confusing. Of course, indications are available in the service manual but to my opinion, such information are not clear enough, printed in very small characters and it is not always easy to find one's bearings. Most of the time, B3/C3 service manuals are copy of copy of copy ... so at the end it becomes simply unreadable. Then, I have decided to investigate that specific matter and come up with a "handy wiring guide" in order to facilitate that re-cabling operation without any possible wiring mistake. That was the initial intention. The note position of keyboard is added at each terminal of TWG according to the Hammond table III entitled " Frequency numbers assigned to keys and pedals " – refer to Page 3-4 of the B3/C3 service manual. For those who are equipped with frequency-meters or scopes with built-in frequency counters, the frequency of each note has been also added at each TWG terminal. This article is mainly focused on correct 'Re-wiring' after maintenance intervention on keyboards. Dismounting of keyboards are not covered in this article. ( as an example, refer to http://b3world.com/hammond-techinfo3.html - § 5-78 ). An adequate technical expertise is compulsory. So this article is mostly addressed to qualified technicians endowed with sufficient know-how, dexterity and ... patience. (*) TWG : Tone-Wheel Generator


2. TWG to keyboards wiring concept. When referring to the Wiring Diagram Fig.4-1 of the B3/C3 service manual, we may notice that terminals of TWG are arranged in a certain order that depends of the TWG tone-wheels organization defined by Mr.Laurens Hammond himself.

GND

FREQUENCY NUMBERS IN CONSECUTIVE ORDER

Extracted from B3/C3 service manual - wiring diagram Fig.4-1

Let's put the attention on the above schematic diagram (simplified) that is composed of four main 'blocks' and the top section represents the Resistor Panel and Pedal Filter. The Lower and Upper manual blocks are simply 'parallel linked'. This means 'point-to-point' connections. Not so much to tell about that. It has to be mentioned that frequency numbers have to be connected in consecutive order from Note # 13 up to Note # 91. The point is : 'Why to start at Note # 13 ?'. Good question indeed. The reason is that Frequency Numbers from Note # 1 up to Note # 12 are the fundamental notes only connected to the pedal keyboard (i.e. one octave lower than those of Upper and Lower keyboards). The output signals from the Tone Generator (TWG) block are located on 4 bakelite strips composed of 24 terminals each (see picture on covering page). Each terminal is feeding either all keyboards or only the pedal keyboard. Depending of its Note Number assignment.


The lower block represents the Pedal Keyboard on which only 68 frequency numbers are assigned. In addition to those 68 connections, on the left-end side, 4 coloured wires + 1 black wire are connected to the resistor panel and pedal filter as follows : - Yellow : 10th and 12th harmonics - Orange : 6th and 8th harmonics - Red : 2nd and 4th harmonics - Brown : Fundamental and 3rd harmonics - Black : ground Here again, the frequency numbers are connected in consecutive order from Note # 1 up to Note # 68. For easiness of understanding, several tables have been prepared as follows : Table # 1 – Legend (or glossary). This sketch is simply drawn to become familiarized with annotations of the two subsequent tables. The first bakelite strip (left side of TWG) is composed of 24 terminals numbered from '1' to '24'. The next strip will start at '25' up to '48', and so on up to '96'. The reference of Hammond Note Nbr is placed on top of each of those terminals. This Hammond Nbr has been assigned arbitrarily by Hammond engineers for industrial convenience and, in fact, is hiding the exact frequency from each tone-wheel. On the connecting cable itself, two additional elements are added : - in blue inked, the reference of the key of the keyboard. - in red inked, the frequency generated by the corresponding tone-wheel. The little " " deplicts a spacing of cables lacing. This reference is extremely important for correct re-wiring process. Spacing is available when there is no connection on the relevant terminal. As an example, there is no connection to upper and lower keyboards at terminal # 7 of the bakelite strip, then a spacing is put to bypass this unused TWG terminal for the upper and lower keyboards. Same for terminal #14 and terminal #22.... Cabling to pedal keyboard are located on the bottom side of bakelite terminal strips. Table # 2 : Wiring to Upper and Lower Keyboards. This table represents the overall wiring scheme from TWG to both Upper and Lower keyboards. Most important ground points of the whole organ are brought together at terminals #94 to #96. Table #3 : Wiring to Pedal Keyboard. This table represents the overall wiring scheme from TWG to the pedal keyboard. Only the fundamentals notes (25 in total) are shown. The harmonics are not included but can be easily found (if needed...) with indications on Table # 2. Appendix # 1 : Hammond Note Nbr / 'Key' Ref / Relat ed frequency. This table is provided to get a better relation between the Hammond Note number, the effective key on keyboard and subsidiarily the associated frequency.

B3/C

3 Handy W

iring Guide B

3/C3

M

ay .2015 H

amm

ond Vintage

dan.vigin

P

age 6 3.1

Table # 1 – LE

GE

ND

(glossary).

85 42 30 78 66 18

6

54 90 35 83 71 23

11

59 47 40 28 76 64 16

4

52 88

Knot

to Upper & Lower manuals

4.18

6,01

349,

22

174,

61

2.79

3,83

1396

,91

87,3

0

698,

45

5.58

7,65

233,

08

3.72

9,31

1.86

4,66

116,

54

932,

32

466,

16

311,

12

155,

56

2.48

9,02

1.24

4,51

77,7

8

622,

25

4.97

8,03

38,8

9

43,6

5

58,2

7 D#1F1 A#1

D#2F2F7

A#2

D#3F3

A#3

D#4F4

A#4 D#5F5

A#5 D#6F6

A#6

D#7

A#7C8

D#8F8

Position of terminals on TWG

chassis in consecutive order

Hammond Note Nbr.

1 2 3 4 5 6 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 247

‘Key’ Reference on keyboards

Frequency in ‘Hz’

Notes for pedal keyboard

(lower bundle of wires)24-terminalsbakelite strip

Black cables lacing(on top of TWG)Spacing

B3/C

3 Handy W

iring Guide B

3/C3

M

ay .2015 H

amm

ond Vintage

dan.vigin

P

age 7

3.2 T

able # 2 : Wiring to U

pper and Lower K

eyboards.

25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

85 42 30 78 66 18

6

54 90 35 83 71 23

11

59 47 40 28 76 64 16

4

52 88

6233 81 69 21

9

57 45 38 26 74 14

2

50 86 43 31 79 67 19

7

55 91 36

84 72 24

12

60 48 41 29 77 65 17

5

53 89 34 82 70 22

10

58 46 39 27 75

63 15

3

51 87 32 80 68 20

8

56 44 37 25 73 61 13

1

49 NC NC

ChassisGround

Knot

Knot

to Upper & Lower manuals

4.18

6,01

349,

22

174,

61

2.79

3,83

1396

,91

87,3

0

698,

45

5.58

7,65

233,

08

3.72

9,31

1.86

4,66

523,

25

880,

00

116,

54

932,

32

466,

16

311,

12

155,

56

2.48

9,02

1.24

4,51

77,7

8

622,

25

4.97

8,03

207,

65

3.32

2,44

1.66

1,22

103,

82

830,

60

415,

30

277,

18

138,

59

2.21

7,46

1.10

8,73

69,2

9

554,

36

4.43

4,92

369,

99

184,

99

2.95

9,96

1.47

9,98

92,4

9

739,

98

5.91

9,91

246,

94

3.95

1,07

1.97

5,53

123,

47

987,

76

493,

88

329,

62

164,

81

2.63

7,02

1.31

8,51

82,4

0

659,

25

5.27

4,04

220,

00

3.52

0,00

1.76

0,00

110,

00

440,

00

293,

66

146,

83

2.34

9,32

1.17

4,66

73,4

1

587,

33

4.69

8,64

195,

99

1.56

7,98

3.13

5,96

97,9

9

783,

99

391,

99

261,

62

130,

81

2.09

3,00

1.04

6,50

65,4

0

32,7

0

34,6

4

36,7

0

38,8

9

41,2

0

43,6

5

46,2

4

48,9

9

51,9

1

55,0

0

58,2

7

63,7

3

C1

C#1

D1

D#1

E1

F1

F#1

G1

G#1

A1

A#1

B1

C2

C#2

D2

D#2

A5

E2

F2

F#2

F7

G2

G#2

A2

A#2

B2

C3

C#3

D3

D#3

E3

F3

F#3

G3

G#3

A3

A#3

B3

C4

C#4

D4

D#4

E4

F4

F#4

G4

G#4

A4

A#4

B4

C5

C#5

D5

D#5

E5

F5

F#5

G5

G#5

A#5

B5

C6

C#6

D6

D#6

E6

G6

F6

F#6

G#6

A6

A#6

B6

C7

C#7

D7

D#7

E7

F#7

G7

G#7

A7

A#7

B7

C8

C#8

D8

D#8

E8

F8

F#8

Position of terminals on TWG

chassis

Hammond Note Nbr.‘Key’ Reference

of keyboards

Frequency in ‘Hz’to pedal keyboard

HAMMOND B3/C3

Issued by : Dan.ViginFile.: TWG_Wiring_Assignation.vsd

TWG-WIRING-ASSIGNATION

Hammond(R) and Leslie(R) are registered trademarks of Suzuki Musical Instrument Manufacturing Co. Ltd.

74 75 76 77 78 79 80 88 8973 81 9083 84 9691 92 93 94 9582 85 86 87

1 2 3 4 5 6 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 247

49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72

24-terminalsbakelite strip

NC = No ConnectionWiring to upper & lower keyboards

to A

to BA

Bto C

C

B3/C

3 Handy W

iring Guide B

3/C3

M

ay .2015 H

amm

ond Vintage

dan.vigin

P

age 8

3.3 T

able #3 : Wiring to P

edal Keyboard.

25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

85 42 30 78 66 18 6 54 90 35 83 71 23 11 59 47 40 28 76 64 16 4 52 88

6233 81 69 21 9 57 45 38 26 74 14 2 50 86 43 31 79 67 19 7 55 91 36

84 72 24 12 60 48 41 29 77 65 17 5 53 89 34 82 70 22 10 58 46 39 27 75

63 15 3 51 87 32 80 68 20 8 56 44 37 25 73 61 13 1 49 NC NC

ChassisGround

Knot

Knot

to Pedal Keyboard

349,

22

174,

61

1396

,91

87,3

0

698,

45

233,

08

523,

25

880,

00

116,

54

932,

32

466,

16

311,

12

155,

56

1.24

4,51

77,7

8

622,

25

207,

65

103,

82

830,

60

415,

30

277,

18

138,

59

1.10

8,73

69,2

9

554,

36

369,

99

184,

99

1.47

9,98

92,4

9

739,

98

123,

47

987,

76

493,

88

329,

62

164,

81

1.31

8,51

82,4

0

659,

25

220,

00

110,

00

440,

00

293,

66

146,

83

1.17

4,66

73,4

1

587,

33

195,

99

1.56

7,98

97,9

9

783,

99

391,

99

261,

62

130,

81

1.04

6,50

65,4

0

32,7

0

34,6

4

36,7

0

41,2

0

43,6

5

46,2

4

48,9

9

51,9

1

55,0

0

58,2

7

63,7

3

C1

C#1

D1

D#1

E1

F1

F#1

G1

A1

A#1

B1

C2

C#2

D2

D#2

E2

F2

F#2

G2

G#2

A2

A#2

C3

Position of terminals on TWG chassisHammond Note Nbr.

Fondamental noteon pedal keyboard

Frequency in ‘Hz’

HAMMOND B3/C3

Issued by : Dan.ViginDate : 15.04.08

File.: TWG_Wiring_Assignation.vsd

TWG-WIRING-ASSIGNATION

Hammond(R) and Leslie(R) are registered trademarks of Suzuki Musical Instrument Manufacturing Co. Ltd.

74 75 76 77 78 79 80 88 8973 81 9083 84 9691 92 93 94 9582 85 86 87

1 2 3 4 5 6 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 247

49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72

24-terminalsbakelite strip

NC = No Connection

38,8

9

G#1

to Pedal Keyboard

Wiring to pedal keyboard

Pedal harmonics

B2

to A

A

to B

B


4. Another way to proceed. For those who found the above method too complicated, there is another way to cope with TWG re-wiring. The next picture is self-explanatory. Before unsoldering, just tie up a little sticky label (or the like) with the reference number of the corresponding TWG terminal. This way was previously experimented as well and has been proved also effective. Sticky labels Spacings

5. Other surrounding wirings. As stated in the introduction, this article is mostly focused on TWG wiring and it is obvious that whenever keyboards have to be removed from the cabinet, in addition to TWG wiring, there are a lot of other cables to be dismounted ( scanner, vibrato line box, resistor panel, AO-28 preamp, etc...). However, those cables are easily identified since either shielded or coloured. Before unsoldering, it is highly recommended to take due note of the exact initial location of each cable. Taking close-up pictures is a good idea, also advisable and often very useful. Remember, no room for wiring error ! Also refer to Page 5-12, § 5.79 of B3/C3 service manual.


6. My conclusion. The purpose of this article is to provide a reference tool when removing keyboards from the B3/C3 cabinet. Evidently, it has been written based on my own intruments with S/N above 56000. Minor discrepancies in wiring scheme may arise and have to be taken into consideration for lower S/N ranges. Refer to B3/C3 service manual. Trust having been of some help. Dan. Sources : - Hammond Service Manual B3/C3

- DVD of Alain Kahn ' Hammond Inside ' – Part One - http://b3world.com/hammond-techinfo3.html - § 5-78

Disclaimer :

This information is simply for educational purposes only and no claims are made that this information will lead to any successful repair. Dan Vigin assumes no responsibility to its use.


Appendix # 1 : Hammond Note Nbr / 'Key' Ref / Rela ted frequency.

B3/C3 Key Nbr & Frequency Assignation .

Hammond 'Key' Ref. Frequency Hammond 'Key' Ref. Frequency Hammond 'Key' Ref. Frequency

Note Nbr. in Hz. Note Nbr. in Hz. Note Nbr. in Hz.

1 C1 32,7032 37 C4 261,626 73 C7 2.093,00

2 C#1 34,6478 38 C#4 277,183 74 C#7 2.217,46

3 D1 36,7081 39 D4 293,665 75 D7 2.349,32

4 D#1 38,8909 40 D#4 311,127 76 D#7 2.489,02

5 E1 41,2034 41 E4 329,628 77 E7 2.637,02

6 F1 43,6536 42 F4 349,228 78 F7 2.793,83

7 F#1 46,2493 43 F#4 369,994 79 F#7 2.959,96

8 G1 48,9994 44 G4 391,995 80 G7 3.135,96

9 G#1 51,9131 45 G#4 415,305 81 G#7 3.322,44

10 A1 55,0000 46 A4 440,000 82 A7 3.520,00

11 A#1 58,2705 47 A#4 466,164 83 A#7 3.729,31

12 B1 63,7354 48 B4 493,883 84 B7 3.951,07

13 C2 65,4064 49 C5 523,251 85 C8 4.186,01

14 C#2 69,2957 50 C#5 554,365 86 C#8 4.434,92

15 D2 73,4162 51 D5 587,330 87 D8 4.698,64

16 D#2 77,7817 52 D#5 622,254 88 D#8 4.978,03

17 E2 82,4069 53 E5 659,255 89 E8 5.274,04

18 F2 87,3071 54 F5 698,456 90 F8 5.587,65

19 F#2 92,4986 55 F#5 739,989 91 F#8 5.919,91

20 G2 97,9989 56 G5 783,991

21 G#2 103,826 57 G#5 830,609

22 A2 110,000 58 A5 880,000

23 A#2 116,541 59 A#5 932,328

24 B2 123,471 60 B5 987,767

25 C3 130,813 61 C6 1.046,50

26 C#3 138,591 62 C#6 1.108,73

27 D3 146,832 63 D6 1.174,66

28 D#3 155,563 64 D#6 1.244,51

29 E3 164,814 65 E6 1.318,51

30 F3 174,614 66 F6 1.396,91

31 F#3 184,997 67 F#6 1.479,98

32 G3 195,998 68 G6 1.567,98

33 G#3 207,652 69 G#6 1.661,22

34 A3 220,000 70 A6 1.760,00

35 A#3 233,082 71 A#6 1.864,66

36 B3 246,942 72 B6 1.975,53

Handy Wiring Guide B3 C3 - Hammond X66 Organ Club · B3/C3 Handy Wiring Guide B3/C3 May .2015...

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