IBM 5150 Hardware Maintenance Manual

1. Position the System Unit Power switch to Off.
2. Set the meter switch on the OHM's (xl) scale .
3. Remove
the System Board connectors from the System
Board and take resistance measurements
on the System
Board pins
as shown below.
•
Common lead
5 6 7 8 8 8
Ohm lead
3 4 9 10 11 12
Minimum
6
48 17 0.8 0.8 0.8
Resistance
ohms ohms
ohms
ohms ohms
ohms
Connectors
Top View Power Supply
ARE ANY
OF THE RESISTANCE MEASUREMENTS
BELOW THE MINIMUM SHOWN IN THE TABLE?
NO You have a bad power supply. See Section 3,
"Removal/Replacement. "
YES You have a bad system unit board. See Section 3,
"Removal/Replacement. "
020-9

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