IBM 5251 Series Maintenance Information Manual page 35

115
(continued)
- Check the '+8.5 Vdc' line at connector C of the MSR
card.
Is the voltage correct?
Y N
- Inspect the interposer.
- Replace the planar; set the jumpers correctly on
the new planar (103) (105).
Check the '+5 Vdc' and the '-5 Vdc' lines at
connector C of the MSR card.
Are the voltages correct?
Y N
- Inspect the interposer.
- Replace the planar; set the jumpers correctly on
the new planar (103) (105).
Check the '+5 Vdc' and the' -5 Vdc' lines on the
interposer test pins at connector D of the MSR card.
Are the voltages correct?
Y N
- Inspect the interposer.
- Replace the MSR card (119).
- Probe the' +photocell' signal on the interposer test
pins at connector 0 of the MSR card.
Pass the test card through the reader.
Does the line pulse?
Y N
Probe the' ground' line at connector C of the MSR
card.
Is the line at a Down level?
Y N
- Inspect the interposer.
Replace the planar; set the jumpers correctly on
the new planar (103) (105).
- Probe the' ground' line on the interposer test pins
at connector D of the MSR card.
Is the line at a Down level?
Y N
A B
115
Inspect the interposer.
Replace the MSR card (119)
•••••
.
.
A B
- Power off.
- Disconnect the MSR cable.
- Power on.
- Probe the '+photocell' signal on the interposer at
connector 0 of the MSR card.
Is the line at an Up level?
Y N
Inspect the interposer.
- Replace the MSR card (119).
- Replace the MSR assembly (119).
- Power off.
- Disconnect the MSR cable.
- Power on.
- Probe the '+photocell' signal on the interp'Jser at
connector D of the MSR card.
Is the line at an Up level?
Y N
Inspect the interposer.
- Replace the MSR card (119).
- Reconnect the MSR cable.
Power off.
- Reconnect the MSR cable.
Probe the' - POR' signal at connector C of the MSR
card.
Power on.
Note: The level should change from Down to Up.
Does the line change level?
Y N
c
Power off.
- Remove the MSR card (119).
Probe the '-POR' signal at the planar.
Power on.
Does the line change level?
Y N
Inspect the interposer.
Replace the planar; set the jumpers correctly on
the new planar (103) (105).
- Replace the MSR card (119).
Maintenar'!ce Procedures 5251 MIM 1·17