IBM 5251 11 Maintenance Information Manual page 34

114·
(continued)
Remove the connector from the planar.
Use a CE meter.
Check continuity at the planar end of the cable
between the common
~nd
the normally open lines
with the switch in the locked position.
Is there continuity?
Y N
- Repair or replace the key lock 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 meter indicate an open?
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 key lock assembly.
Replace the planar board (set the jumpers correctly on
the new planar (103) (105) ).
114
Suggested action for an intermittent problem:
• Analyze the suspected line; inspect all the connector
contacts.
• Replacement sequence:
Keylock Assembly
- Planar
Maintenance Procedures 5251 MIM 1-15