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FM-AM Standard Signal Generator MSG-2570 ( Meguro )

[Outline] [Trouble-shoots]
[Reset the control logic board] [Polish the contact of the keys] [Replace an operational amplifier]

Fig1. The modulator board.	Fig.2 400Hz OSC of the modulator board.         Pin 14 of U1 was fixed to -12V.

Fig.3 Remove U1 ( uPC8048C)  from the board.	Fig.4 Remove the solder from the lands.

Fig.5 uPC804C ( for replace ) and upc4084C ( removed ). Both are the 2nd source of TL084.	Fig.6 uPC804C was 294 yens for one piece.

Fig.7 uPC804C ( replaced ) and upc4084C.	Fig.8 The 400Hz signal started to oscillate.          400Hz and 1kHz signals are not synchronized

Fig.9 Attach the modulation board to the chassis.	Fig.10 After the repairing.