IBM 7012 G Series, Service Manual

Page: 94 / 264

3-1520-4
Service Guide
Step 6
(from Step 3)
Note: Either the Operator Panel (99 % failure probability) or the system planar (1 % failure
probability) is defective.
1. Unplug the system unit power cable from the wall outlet.
2. Exchange the operator panel. See “Operator Panel” on page 4-11.
3. Connect the system unit power cable to the wall outlet.
4. Be sure that the key mode switch is set to the Service position.
Has the symptom changed?
NO Reinstall the original Operator Panel.
Repeat Step 6 exchanging the system planar. See “Base Unit System
Planar” on page 4-46.
If you exchanged both operator panel and system planar with no results,
call your service support person for assistance.
YES Go to “Map 0410: Repair Checkout” in the
Diagnostic Information For Micro
Channel Bus Systems.
Step 7
(from Step 2)
Note:
Stand-By
should appear on the Operator Panel Display.
Is
Stand-By
displayed on the Operator Panel Display?
NO If an SRN is displayed, go to “Map 0210: General Problem Resolution” in
the
Diagnostic Information For Micro Channel Bus Systems. If only a
blinking cursor is displayed, record SRN
409-083
and go to “Map 0210:
General Problem Resolution” in the
Diagnostic Information For Micro
Channel Bus Systems.
YES Go to Step 8.