IBM 5150 Hardware Maintenance Manual

Check the voltage between P20-1 and P20-2 at the servo-board
for 11.25-12.6 Vdc.
DO YOU HAVE 11.25-12.6 Vdc FROM P20-2 TO P20-l?
NO Replace the Logic Printed Circuit Board. See Section
3, "Removal/Replacement."
YES
600-22

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