Troubleshooting
6-82
TDS 420A, TDS 430A & TDS 460A Service Manual
Figure 6- 33: Module Isolation Troubleshooting Procedure
In Table 6--10 on page 6--83, find the row containing the first failure reported on the display. Select modules f rom
the table row in numeric order st arting with number 1. The table uses abbreviations for the modules:
Cpu = A03 C PU D1 Cable = D1 Bus cable
Dsp = A09 DSP Acq Cable = Backplane to Acquisition cable
Dsy = A02 Display Attn Cable = Backplane to Attenuator cable
Attn = A05 Attenuator Jumper Board = A08 Jumper
Acq = A04 Acquisition Front Panel cables = Backplane to Front Panel
and CPU to Front Panel
Backplane = A01 Backplane Fp = A06 Front Panel
Replace the module. Run all
extended diagnostics.
Yes
No
Done.
Yes
No
No
Yes
This procedure assumes that
the oscilloscope is up and
running and you can read the
display.
Does
the display report
any errors?
Select the extended diagnostics menu
and run all the tests (for addit ional
diagnostics information, see
Diagnostics on page 6--75).
Are any failures
reported?
The oscilloscope is ok.
Yes
No
Is the
selected module
the A05 Attenuator,
A04 Acquisition, or the
A08 Jumper
board?
Using the
troubleshooting
procedures did you find
a faulty
module?
Perform the Attenuator/Acquisition and
Acquisition and Attenuator Power
troubleshooting procedures.
Is the
selected module the
A06 Front Panel board?
Using the
troubleshooting
procedures did you
find a faulty
module?
Perform the Processor/Front Panel
troubleshooting procedure.
No
Yes
Yes
No
Is the
selected module
the A01 Backplane?
Yes
No
Perform the Backplane
troubleshooting procedure.
Using the
troubleshooting
procedure did you find
a faulty module?
No
Yes
Done.
Done.
Does the
display report
any errors?
Select the next module from
Table 6--10.
No
Yes
Done.
Select the next module from
Table 6--10.
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