Chapter 5: Troubleshooting
Power Supply Trouble Isolation
77
Figure 5-5
Power Supply Trouble Isolation Flowchart
Power Supply Trouble Isolation
Disconnect cables from the DC
interface assembly (54857-66506),
disconnect the sense cable from
the power distribution board, plug
in the ac power cord to the power
supply, and turn on the scope.
Does
power supply
fan turn?
Check ac power cables to
power supply
No
Are
cables
OK?
No
Replace power supply.
Yes
Reseat or replace bad cable.
Go to 'Power Board
Trouble Isolation'.
Check the voltages on the DC
interface assembly
(see the following procedure).
Yes
Are
voltages
OK?
No
Yes
Remove ac power.
Power supply OK.
End
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