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136
(continued)
- Check the failing line at the planar with the
10
jumper
installed on the jumper block.
Is the line at a Down level?
Y N
Check for an
o~en
line back through the keyboard
logic PC board.
Check the failing line at the planar with the jumper
10
removed.
The line should be at an Up level.
Is the line at an Up level?
Y N
Leave the jumper off.
Check the line from the planar back to the jumper
block on the logic PC board for a ground.
Is the line OK?
Y N
Replace the cable or keyboard logic PC board.
I nspect the interposer.
Replace the planar (set jumpers correctly on the
planar (103) (105) ).
Set the
10
jumper correctly.
Inspect the interposer.
Replace the planar (set jumpers correctly on the planar
( 1 03) (1 05) ).
Set the
10
jumper correctly.
136
Suggested action for an intermittent problem:
• Analyze the suspected line; inspect all the connector
contacts.
•
Replacement sequence:
Planar
Keyboard Cables
Keyboard Logic PC Board
Maintenance Procedures
5251 MIM
1-23
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