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IO_Board:

Here is the part list:

ImageDescriptionPartValueQty
Jack 6,35 NRJ4HFBD, CB, CH, CP/MA, CY, HT/HC, LT/LC, MASTER, MT/MC, OH, RS/CL, SD, TRIG1, TRIG2 14
Electrolytic capacitorC110/251
DiodeD91N41481
Din connectorDIN_SYNC, IN, OUT, THRU 4
OptocouplerIC46N1381
Cable 4PosJP1, JP2, JP3 3
Cable 10PosJP4 1
Audio CableMST25cm1
PNP Silicon TransistorQ1, Q22SA7332
1/4w Carbon resistorR1, R2, R3, R4, R6, R7, R1333K7
1/4w Carbon resistorR5, R23, R2622K3
1/4w Carbon resistorR8, R9, R11, R22, R2547K5
1/4w Carbon resistorR1056K1
1/4w Carbon resistorR121K21
1/4w Carbon resistorR14, R24, R271K3
1/4w Carbon resistorR165k61
1/4w Carbon resistorR17, R18, R19, R20, R212205
1/4w Carbon resistorR31, R322K22
1/4w Carbon resistorR33, R34100K2

Make it:

Here is the IO_Board

Solder all resistors.

Solder each value one after the other.

Solder D9 diode 1N4148

MAKE SURE DIODE IS IN THE RIGHT WAY

Solder the electrolytic capacitor

MAKE SURE ELECTROLYTIC CAPACITOR IS IN THE RIGHT WAY

 

Assemble the two 2SA733 transistors they are the output buffers of TRIG1 and  TRIG2

 

MAKE SURE TRANSISTORS ARE IN THE RIGHT WAY

Solder the 14 6.35mm Jacks
Solder the four Din connectors
Solder the 6N138 optocoupler
Solder the three cable 4 wires and the cable 10-wire on IO_Board.
Strip one end of the audio cable and connect both ground together as on the picutre. Tin your cable.
Strip the other side and cutting both ground.Tin it.
Solder the end of the cable who has three wires (red, white and ground) to IO_Board. Take the red wire to No. 1, the ground in the middle and white for the No. 3 as the picture.

Now solder the cables 4-wires and 10-wires to the Main_Board.

This is a bit tricky. Be careful.

Now solder the other end of the audio cable to the Main_Board in the master section. Take the red wire as No. 1 and No. 3 for white. There is nothing to solder on the pad in the middle.
Desoldering and make power cables shorter with a length of 8cm.

Resolder the power supply cables.

RESPECT THE ORDER OF WIRING. LOOK WELL THE PICTURE. THE PADS ARE FACING  EACH OTHER!

You can then go to Finished assembly