IBM 5150 Hardware Maintenance Manual page 147

Error
Description
Diagnostic Action
Power
l.
Position Printer Power switch to OFF.
Supply
Unplug Printer power cord. Position Printer
r Check
Power switch to ON. Measure 2-12 ohms
between voltage terminals on power cord.
Resistance
=
2-12 ohms?
YES: Go to step 3.
NO: Check for open fuse (see Section 5,
"Locations").
Fuse open?
YES: Replace fuse (see Section 3,
"Removal/Replacement").
Power off. Plug in Printer
power cord. Power on for
1 minute.
Does fuse open?
YES: Go to step 2.
NO: Problem resolved.
NO: Check for approximately 22 ohms on
primary side of power transformer
(see Section 5, "Locations").
Resistance
=
22 ohms?
DANGER: STATIC VOLTAGE MAY BE
PRESENT ON THE FUSE­
FILTER CARD. USE EXTREME
CAUTION IN THIS AREA.
YES: Replace Fuse-Filter card (see
Section 3, "Removal/
Replacement").
NO: Replace power transformer
(see Section 3, "Removal/
Replacement").
1400-6