Power Switch Check - IBM System 9000 Troubleshooting And Servicing

3 . 3 POWER SWITCH CHEC K
The power switch check requires disassembly of the IBM 9001 as far as s tep
4 in Section 5 . 5 . 1 , "Removal. " The diagram fol lowing s hows the power cord
( facing you) and the connector on the power supply.
power - supply AC connector.
the power - supp l y AC connector and the power cord are those shown in this
table.
Switch
Position
ON
ON
ON
OFF
OFF
OFF
I f your readings differ from these , replace the power switch or return
the processor unit to IBM for repair .
MALE PLUG
(CONNECTED TO MACHINE)
Optional Diagnostic , Voltage, and Res i stance Checks 3 - 2
Verify that the resistance readings between
Line Cord Plug and
AC Connector Posit ion
AC LINE AC LINE
NEUTRAL NEUTRAL
GROUND GROUND
AC LINE
AC LINE
NEUTRAL NEUTRAL
GROUND GROUND
Gnd.
Dis connect the
Ohms
0
0
0
00
00
0
AC Neutral
POWER SUPPLY CONNECTOR