Interposer Selection Failures - IBM 29 Card Punch Field Engineering Maintenance Manual

Operate numeric
and alphabetic
character keys
Check interposer relatch
Check keyboard restore
Check keyboard contacts
for short circuit
Extra interposers or repeat punch cycles Interposers No
selected
Yes
Duplicate space,9...12
Extra interposers on dup Interposers No
Check interposer relatch
E heck pin-sense contact|
Check common bar
Check throat plates and
card registration
Key
Check interposer magnet
mechanism
Check interposer
Check keyboard shift ckt
Check for magnet impulse.
If no pulse, proceed to
key or dup branch
Dup
|
Check keyboard contacts
| Check restore circuit|
Figure 1-7. Interposer Selection Failures
[check pin-sense contacts |
| Check sensing pin |
Check card registration
29FEMM (4/69) 1-5