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TROUBLESHOOTING
DIAGNOSTIC POWER UP TESTS
I-E96-192-5A
4 - 3
DC Power Test
Follow these steps to test the DC power supply. The necessary
test equipment consists of a digital voltmeter. Figures
and
1. Turn off power to the console.
NOTE: Do not disconnect the power wiring from the multibus card
cage (IIOIC422 models).
2. Unplug DC power distribution cables from all peripheral
devices (ADP panel and keyboard interface board, if present).
Disconnect the power cables at the distribution side of the
cables.
3. Make certain the power line cord for the power supply is
plugged into the power entry panel (keyboard interface assem-
bly for the IIOIC421 tabletop).
4. Insure that
all
power supply wiring is correct. Refer to
and
5. Apply power to the console.
6. Measure the DC voltages at the multibus card module
backplane for the IIOCI422 models and at connector P16 of the
IIMKM02A module for all other OIC models.
7. Take the voltage measurements with the power supply
under load. Measure the +5.00 VDC; the voltage should be
+0.25 VDC and -0.0 VDC of the value. Measure the
+12.00 VDC and -12.00 VDC; the voltage should be +1.5 VDC
and -1.00 VDC of the value.
NOTE: Unstable operation may result if the power supply voltages
are not in tolerance.
8. Turn off the power to the console.
9. Connect all DC power distribution cables removed in Step 2.
10. Apply power to the console and check the DC voltage levels
again. Adjust the power supply to obtain the voltage within a
tolerance of +0.05 V.