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Troubleshooting
Maintenance
836
Yes
No
Done.
No
Yes
Use this procedure to
determine if a problem is
caused by the Low Voltage
Power Supply.
Do you
hear the
clicking?
Press the ON/STBY
button a few times and
listen for a relay clicking
sound.
No
Yes
Is the fuse
blown?
Yes
No
Replace
fuse. Does
fuse blow
again?
Yes
No
Does
oscilloscop
e work?
Does
the oscilloscope
power up and are the
secondary voltages
(Table 84)
ok?
The LVPS
module is ok.
Replace LVPS
module.
Remove cable
from J1 on the
LVPS module.
Yes
No
Is
there 1
to 1.5V on pin 13
of the
connector?
The LVPS module is ok. Perform
the Front Panel/Processor
troubleshooting procedure.
Power off the oscilloscope and
disconnect J2 from the LVPS
module. Power back on.
Yes
No
Are the
secondary
voltages
ok?
Replace the Monitor module.
Disconnect the power
cord. Disconnect J1
from the LVPS module.
Reconnect power.
Yes
No
Are the
secondary
voltages
ok?
Perform the Supply
Overload troubleshooting
procedure (Figure 826).
Power off the oscilloscope
and disconnect J4 from the
LVPS module. Power back
on.
Yes
No
Are the
secondary
voltages
ok?
Replace the option module.
Figure 824:Power Supply Troubleshooting Procedure
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