IBM 5251 Series Maintenance Information Manual page 36

115
(continued)
c
Probe the' 1.0 MHz osc' signal at connector C of the
MSR card.
Is the line pulsing?
Y N
Is the line at an Up level?
Y N
- Replace the MSR card (119).
- Inspect the interposer.
- Replace the planar; set the jumpers correctly on
the new planar (103) (105).
- I nspect the interposer.
- Replace the planar; set
the~jumpers
correctly on
the new planar (103) (105).
- Probe the '- reg 25 bit l' signal at connector C of the
MSR card.
Are both probe lights Off?
Y N
- Check for proper positioning of the jumpers (118).
- Replace the MSR card (119).
- Inspect the interposer.
- Replace the planar; set the jumpers correctly on the
new planar (103) (105).
1-18
Suggested action for an intermittent problem:
• Analyze the suspected line; inspect all the connector
contacts.
• Replacement sequence:
MSR card
MSR assembly
Planar