Commodore 1541 Maintenance Manual page 9

Section 3-INITIAL CONFIGURATION
3-1. General
This section provides step-by step procedures for setting the AC
line voltage (selectable between 100 VAC and 120 VAC) and the
device number (selectable between 8,9,10 or 11).
3-2.
AC Power
When replacing the Disk Controller P.C. Bd., the AC input power
may require changing. If Disk Controller P.C.Bd. 1540001-xx (long
board version typical of VIC-1541 (1540)) is replaced with Disk
Controller P.C.Bd. 1540048-xx (short board version typical of
1541), or vice versa, the input power will require
re-configuration. To re-configure, perform the following steps:
1. Disconnect AC power cord from J9.
2. Disconnect serial bus cable(s) from J3 and/or J4.
3. Remove top cover. (Ref er to Section
6-DISASSEMBLY/REASSEMBLY)
4. Remove RFI shield. (Refer to Section
6-DISASSEMBLY/REASSEMBLY)
5. Remove Disk Controller P.C. Board.
6-DISASSEMBLY/REASSEMBLY)
(Refer to Section
6. Desolder wire from pin 1 of J9. (Refer to Figure 3-1)
7. Solder desired tap of Tl to pin 1 of J9:
a. Solder black tap of Tl to pin 1 of J9 for 1540001-xx
P.C.Bd. (long board version typical of VIC-1541(1540)).
(Refer to Frame Schematic)
b. Solder red tap of Tl to pin 1 of J9 for 1540048-xx
P.C.Bd. (short board version typical of 1541). (Refer
to Frame Schematic)
!WARNINGI
• TO PREVENT A POSSIBLE SAFETY HAZARD,
INSULATE PIN 1 OF Tl WITH HEAT SHRINK
TUBING OR EQUIVALENT. USING HEAT SHRINK
OR ELECTRICAL TAPE, INSULATE UNUSED TAP
OF Tl AS SHOWN IN FIGURE 3-1.
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