Service manual

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.