IBM 5150 - Page 171

Error
Description
Diagnostic Action
Control
Panel
7. Press the Line Feed switch.
Do forms step?
YES:
Go to step 8.
NO:
Measure for approximately +4 to
5.5 V dc on pin 7 of Control Panel.
Use pin 8 for ground (see Section 5,
"Locations").
5 Vdc?
NO:
Replace both Control cards
(see Section 3, "Removal/
Replacement").
YES:
Press and hold Line Feed
switch. Measure for 0
to
+ l.5 Vdc on pin 7 of Control
Panel.
l.5 Vdc?
YES:
Replace both Control
cards (see Section 3,
"Removal/
Replacement").
NO:
Replace Control Panel
(see Section 3,
"Removal/
Replacement").
1400-30