IBM 5150 Hardware Maintenance Manual page 172

Error
Description
Diagnostic Action
Control
8. Press Forms Feed switch.
r,Panel
Do forms advance?
YES: Go to step 9.
NO: Measure for approximately +4 to
5.5 Vdc on pin 6 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 Forms Feed
switch. Measure 0 to + 1.5 Vdc
on pin 6 of Control Panel.
",......
1.5 Vdc?
YES: Replace both Control
cards (see Section 3,
"Removal/
Replacement").
NO: Replace Control Panel
(see Section 3,
"Removal/
Replacement") .
",......
•
1400-31