Filter
Top Products
Troubleshooting
TDS 684A, TDS 744A, & TDS 784A Service Manual
6–59
Replace the A10
Acquisition module
Perform the A16 Low Voltage
Power Supply Module Isolation
troubleshooting procedure.
Does
the oscilloscope
power on, all the diagnostics
pass, but sometime later
powers down on its
own?
Yes
No
Yes
No
No
Yes
Press on the principal
power switch on the back
of the oscilloscope.
Can you
hear the fan
whirling?
Press
the ON/STBY
button. Can you
hear the
fan now?
When
the oscilloscope
powers on, do the front-
panel lights come on and
then go off about 30
seconds
later?
Yes
No
Perform the
Processor/Front Panel
troubleshooting procedure.
Power off and remove the cover using
the Rear Cover and Cabinet removal
procedure. Check all the cables coming
out of the Low Voltage Power Supply,
and the cabling between modules. Be
sure every cable is attached securely.
Does the
system power
on now?
Yes
Does
the display seem
to be working
at all?
No
Is
the display
readable and
stable?
Yes
No
Yes
No
There is something
wrong with the ON/STBY
button. Perform the
Processor/Front Panel
troubleshooting
procedure.
Perform the A16 Low Voltage
Power Supply Module
Isolation troubleshooting
procedure.
Perform the Module Isolation
troubleshooting procedure.
Does
the oscilloscope
respond correctly when
the front-panel buttons
are pushed?
Yes
No
Perform the
Processor/Front Panel
troubleshooting procedure.
Did
you find the faulty
module?
Yes
No
Done.
Figure 6–26: Primary Troubleshooting Procedure