Procedure 7 - Checking Power Supply Voltages • 6B-14; Procedure 8 - Removing And Replacing The Power Supply Board - Control Data Corporation CDC CC63X Hardware Maintenance Manual

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Procedure 7 - Checking Power Supply Voltages
Check the power supply voltages as follows:
1. Remove access lid (procedure 3).
2. Determine if the LEOS on the power supply are lighted.
3. Check for the presence of 5-volt and l2-volt power on the
appropriate test points near the power supply LEOS (fig-
ure 6B-9). These voltages should be 5.10 +0.14 (4.96 to
5.24) volts dc, 12 +0.2 (11.8 to 12.2) volts dc, and -12
+0.2 (-12.2 to -11.8) volts de respectively. Measure
24-volt power on the video monitor board (see figure
6B-15). This voltage should be 24 +2.4 (21.6 to 26.4)
volts dc.
4. Replace access lid (procedure 3).
Figure 6B-9.
GROUND
TEST POINT
Power Supply Board Test Points
04031-2
Procedure 8 - Removing and Replacing the Power Supply Board
Remove and install a new power supply board as follows.
6B-14
WARNING
Line voltage may be present on the
power supply board before step 1 is
performed.
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