Commodore 1541-II Manuale di Servizio Scaricare il pdf (Pagina 26)

UPGRADE NOTES

PCB Assembly #1540048 (Schematic 1540049) requires an upgrade to the reset circuit. The upgrade

consists of:

1) COMPONENT CHANGES:

R25

Change To

6.8K ohm,

1/4 W, +/-5%

R57

Add

220 ohm,

1/4 W, +/-5%

R58

Add

2K ohm,

1/4 W, +/-5%

2) CUT circuit trace near UA1 (See diagram)

3) INSTALL JUMPER WIRES:

BETWEEN:

UA1 pin 8 and UB1 pin 5

UA1 pin 9 and CR4 Anode

UB1 pin 6 and UD3 pin 5 on BACK of

board

4) CUT circuit trace between CR7 Anode and UD3 pin 5 on BACK of board.

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Commodore 1541-II Manuale di Servizio Pagina 26