IBM 5150 Hardware Maintenance Manual page 173

Error
Description
Diagnostic Action
Control
Panel
9.
Remove forms from printer. Press the
Online switch.
Does alarm sound?
YES: Go to step 10.
NO:
Measure for approximately + I 0 to
+12 V dc at pin 10 of Control Panel.
Use pin 8 for ground (see Section 5,
"Locations").
+12 Vdc?
YES:
Replace Control cards (see
Section 3, "Removal/
Replacement").
NO: Replace Control Panel (see
Section 3, "Removal/
Replacement").
10. Does No Paper light go on?
YES:
Control Panel checks good. Return
to "Printer Entry", page 1400-1.
NO:
Measure for approximately + I 0 to
+12 V dc at pin 3 of Control Panel.
12 Vdc?
YES: Replace both Control cards
(see Section 3, "Removal/
Replacement").
NO:
Replace Control Panel (see
Section 3, "Removal/
Replacement").
1400-32