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3 . 0
OPTIONAL D IAGNOSTIC, VOLTA G E , AND RES I STANCE CHECKS
3 . 1
PU RPOSE
Only e lectronic technicians and others who have been trained
WARNING :
in the s afe handling of s o l id-s tate e l ectronic circuits and who
are familiar with operat i ng a volt -ohm multimeter should con
duct the checks i n this chapte r .
The optional checks i n this chapter are provided so that you may e l iminate
possible causes of a fault or malfunction in the IBM 9 00 1 .
voltmeter scale on a high- impedance volt - ohm multimeter (VOM) , you are
able to verify the presence o f power in the computer and to verify the
pres ence of certain logic s ignals .
primarily
for continuity checks to verify the integrity o f switches ,
connectors , and interconnecting cab les .
3 . 2
POWER CORD C H E C K
The diagram to the right repre
sents the power cord with both
connectors facing you . Per form
continuity
test ing of the wires
as specified i n this table .
Wire
AC LINE
NEUTRAL
GROUND
Optional Diagnost i c , Voltage , and Res istance Checks 3 - 1
The ohmmeter scale on the VOM is used
POWER SOURCE
Res ist ance
0 Ohms
AC LINE
NEUTRAL
0 Ohms
0 Ohms
GROUND
By us ing the
MACHINE
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