IBM 5150 Hardware Maintenance Manual page 170

Error
Description
Diagnostic Action
Control
6.
Position the Printer Power switch to OFF.
/"""",
Panel
Insert forms under End-of-Forms switch.
Position the Printer Power switch to ON.
Press Online switch.
Online light off?
YES: Go to step 7.
NO:
Measure for approximately +4 to
5.5 Vdc on pin 5 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 Online switch.
/""""
Measure 0 to +l.5 Vdc on
pin 5 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") .
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