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946261·9701
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2.
Remove disk cartridge, if desired, in accordance with instructions in paragraph 4.3.3.2.
NOTE
Step 3 must be performed by maintenance personnel only.
3.
Set ac circuit breaker (labeled MAIN) on rear of disk drive to OFF.
4.3.6 CHANGING DISK ASSIGNMENTS. The fixed disk in the primary (or only) disk drive is
normally designated disk 0, and the cartridge is designated disk 1. The corresponding designations
for the secondary disk drive are disks 2 and 3. A jumper on the cable adapter board permits
reversing the designations for a given disk drive.
The jumper plug is normally stored as shown in Figure 4-2. To reverse designations for disks 0 and
1, remove the jumper plug and insert it to connect Jl and J3. To reverse designations for disks 2 and
3, remove the jumper plug and insert it to connect Jl and J4.
4.3.7 FAULT OPERATING PROCEDURES. If the FAULT/RESET indicator lights during nor-
mal operation or power application, proceed as follows:
1. Press the FAULT/RESET switch. If the FAULT/RESET indicator is extinguished, nor-
mal operation can be continued. If it remains lighted, proceed to step 2.
2. Press the START/STOP switch and allow spindle to stop rotating.
3. Press the START/STOP switch and observe the FAULT/RESET indicator. If it is ex-
tinguished, normal operation can be resumed. If the F AUL T indicator remains
lighted~
proceed to step 4.
4. Perform the stop and power removal procedure in paragraph 4.3.5.
5. Call a customer service engineer.
4.3.8 OPERATOR PREVENTIVE MAINTENANCE. Operator preventive maintenance is
restricted to daily dusting of the outside of the cabinet (cabinet mount drive) or the front panel of
the rack mount disk drive.
4.4 MAINTENANCE AIDS
Figure 4-3 shows the four light-emitting diodes (LEOs) on the disk controller (PWB version). Figure
4-4 shows the LEOs for the fine line PWB version of the disk controller. These four LEOs are visible
when the cover is removed from the computer by maintenance personnel and provide the following
information:
•
FAUL T - When lighted, the F AUL T LED indicates that a microprogram type of failure
has occurred and that the controller must be repaired. Specifically, the FAULT LED
lights when the command timer on the controller times out, indicating that the controller-
initiated operation was not completed within the prescribed 200 ± 20 milliseconds or a
self-diagnostic failure occurred. The FAULT indicator is dimly lighted during normal
operation. The indicator is lighted during self-test.
•
CLK - Operation of the CLK LED is as follows:
LED not lighted - Disk controller clock not running. Possible TILINE access
granted problem.
4-7
Digital Systems Division
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