Commodore 1541 Maintenance Manual page 14

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5-6. Mechanical Alignment of Track 11 Stop
5-6-1. General
This procedure adjusts the Track #1 Stop. The Track #1 Stop is
used by the computer in the VIC-1541 for only two purposes:
1. Formatting a blank floppy disk ("New" command).
2. Soft error recovery.
The procedure that follows should only be used after carefully
verifying that the rest of the VIC-1541 is properly operating, in
accordance with the procedures given in Troubleshooting-Part 2.
5-6-2. Preparation for Mechanical Alignment.
1. Remove all external cables from VIC-1541.
2. Remove upper cover (Refer to Section
6-DISASSEMBLY/REASSEMBLY).
3. Remove RFI Shield (Refer to Section
6-DISASSEMBLY/REASSEMBLY).
4.
Remove Disk Controller PC Board (Refer to Section
6-DISASSEMBLY/REASSEMBLY).
5. Remove Drive Unit (Refer to Section
6-DISASSEMBLY/REASSEMBLY).
6. Reconnect Jl to Pl, J2 to P2, JS to PS, J6 to P6 and J7
to P7 in such a manner that access is still allowed to the
Track #1 Stop adjustment. (See Figure 5-3)
.DO NOT ALLOW PATHWORK ON DISK CONTROLLER
PC BOARD TO CONTACT THE FRAME OR DRIVE
UNIT ASSEMBLIES. USE AN INSULATING
RUBBER MAT, IF NECESSARY, TO INSULATE THE
DISK CONTROLLER PC BOARD FROM THESE
ASSEMBLIES.
5-6-3. Mechanical Alignment
1. Connect serial bus cable between P3 and VIC-20/COMMODORE
64.
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