Service manual

DEVICE NUMBER CHANGE
The 1540 and 1541 drives are shipped from the factory se for device # 8. The channel can be
hardware altered to # 9, 10, or 11 by two methods:
1) Refer to appropriate board layout drawing for the location of the pads provided for this purpose.
The device change pads must be CUT to alter the channel number and re-soldered if another change
is needed later.
2) The preferred method to alter the device number is to lift certain pins of the 6522 chip. The I.C.
should always be socketed, so removal of the chip is simple. Once removed, the proper pin can be
carefully bent to eliminate it from the circuit. If another change is needed, simply remove the I.C. and
re-install with the pin back in place.
PCB ASSY #
LOCATION
DEVICE #
LIFT PIN
1540008
UAB1
9
15
1540048
251748
UC3
10
16
251834
UC3
11
15 and 16