IBM 5251 Series Maintenance Information Manual page 31

114
(continued)
Remove the connector from the planar.
Use a CE meter.
Check continuity at the planar end of the cable
between the common and the normally open lines
with the switch in the locked position.
Is there continuity?
Y N
Repair or replace the keylock assembly.
Check continuity at the planar end of the cable
between the normally open and the normally closed
lines with the switch in the locked position.
Does the CE meter indicate an open circuit?
Y N
Repair or replace the keylock assembly.
Check continuity at the planar end of the cable
between the normally closed and the common lines
with the switch in the unlocked position.
Is there continuity?
Y N
- Repair or replace the keylock assembly.
Replace the planar board; set the jumpers correctly
on the new planar (103) (105).
• • •
I • • '
....
Suggested action for an intermittent problem:
• Analyze the suspected line; inspect all the connector
contacts.
• Replacement sequence:
Keylock assembly
- Planar
Maintenance Procedures 5251 MIM 1-13