Chapter 5: Troubleshooting
Power Supply Trouble Isolation
83
Power Supply Trouble Isolation
Power Supply Trouble Isolation Flowchart
These trouble isolation instructions help isolate the problem to the assembly level when
the power supply is not operating. Because of advanced power supply protection features,
the problem may not be with the supply itself, and therefore you will need to work
through the procedure systematically to determine the source of the fault.
A
Check the power supply voltages.
The power supply voltages are checked on the acquisition board, A13. See See Figure
5- 7 for the location of these test points. Table 5- 8 shows the allowable range of power
supply voltages.
Power Supply
Trouble Isolation
Check Power Supply
Voltages
Voltages OK?
Check for display on
screen
Display on
screen?
Power supply OK, go
to no-display trouble
isolation chart
Check power supply
resistances
Resistance OK?
Power-up OK?
Replace shorted
assembly
Replace Power
Supply
Yes
No
Power supply and
display OK, go to
primary trouble
isolation chart
Yes
No
No
No
A
B
C
D
E
Yes
Replace Fan Control
Board
Done
Yes
To Next Page
Loading...
