IBM 5150 Hardware Maintenance Manual

Reinstall the Logic Printed Circuit Board. Position the
System Unit Power switch to Off for five seconds, insert your
Advanced Diagnostic diskette, then power the System Unit
on. Test for an increase (approximately 0.2 Vdc)
at TP-S on
the Logic Printed Circuit Board during the POST while the
LED is lit.
o
•
DOES THE VOLTAGE AT TP-5 INCREASE
(APPROXIMATELY
0.2 Vdc) WHEN THE "LED" IS LIT?
NO Replace the Diskette Drive assembly. See Section 3,
"Removal/Replacement. "
YES Replace Diskette Drive Adapter. See Section 3,
"Removal/Replacement. "
600-19

IBM 5150 Specifications

General

Processor	Intel 8088
Clock Speed	4.77 MHz
RAM	16 KB - 256 KB
Manufacturer	IBM
Model	5150
Release Year	1981
Storage	5.25-inch floppy drives
Graphics	MDA or CGA
Operating System	IBM PC DOS
Ports	Cassette, keyboard
Expansion Slots	5