Section 1 Keyboard Isolation - IBM 6580 Product Support Manual

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INTERMITTENT PROBLEM DIAGNOSTIC APPROACH - Section 1 Keyboard
• 5218 Printer - See Section 6
• 6361 Mag Card Unit - See the Mag Card Unit
Product Support Manual.
• Printer Sharing - See Section 7
• Communications - See the Communications Service
Manual.
• Power Supply - See Section 8
• Isolation Undetermined - See Section 9
• Software or Operator Procedure - See Section 10
• Environment - See Section 11
SECTION 1 KEYBOARD ISOLATION
Did the customer have a service request number leading to
this area?
YES, loop on the keyboard MDls and see Section 13,
"Service Request Numbers."
NO, follow the procedure below:
1. Loop on BAT (RNA Test G)
Failure - Use the BAT error code with MAPs to
determine the cause, and see Section 14, "BAT
Failures."
• No Failure - Continue with this procedure.
2. Loop on BAT (RNA Test G) while flexing (moving)
the following:
- The keyboard cable and keyboard cable con-
nectors
- The internal distribution cable and connectors
7,
B1-A, and P2
• Failure - Check the cable and connector.
• No Failure - Continue with this procedure.
3. Loop on keyboard MDls
• Failure - Print the trace table, and perform the
fix as instructed.
• No Failure - Continue with this procedure.
4. Loop on keyboard MDls while flexing (moving) the
cables referenced in Step 2.
• Failure - Print the trace table, and check the
cable and connector.
• No Failure - Check all ground wires for a good
ground.
NOTE: If you suspect another area, see that section. If not,
see Section 9.