Commodore 1541 Maintenance Manual page 11

5-5-2. Equipment Required
1. Alignment standard-use a factory recorded disk which has
not been written to since purchase, or a disk which has been
formatted on a VIC-1541 which is known to be in proper
alignment.
2. Digital Voltmeter
3. Video detector-see Appendix E
5-5-3. 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, J5 to PS, J6 to P6 and J7
to P7 in such a manner that access is still allowed to the
stepping motor mount screws (See Figure 5-2) .
• 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.
7. Connect video detector between DVM and pins 7 and 8 of
UH7.
8. Remove any Glyptol or other substance from stepping motor
mount screws (See Figure 5-2).
5-5-4. Head Alignment
1. Connect VIC-20/COMMODORE 64 to video monitor or TV.
(Refer to computer User's Guide for proper connection.)
2. Connect serial bus cable between P3 on VIC-1541 and
serial bus connector on VIC-20/COMMODORE 64.
Page 5-5