Tektronix DSA8200 Service Manual page 141

DSA8200 Digital Serial Analyzer and Modules Service Manual
Table 4- - 4: Failure symptoms and possible causes (cont.)
Symptom
Diagnostic errors
Compensation errors
Modules not recognized
80C0X modules have no
signals displayed
80C0X modules; poor noise
performance
80C0X modules; frequency
response exhibits a steep
negative "droop" in its plot.
BIOS error messages
Instrument locks up
Possible cause(s)
Remove all electrical and optical modules from the
instrument, then diagnostics again. If the instrument passes
diagnostics, check for the electrical and optical module that
is causing the failures. Then run diagnostics again.
If the instrument fails the diagnostics without the installed
modules replace the Acquisition assembly. The run
diagnostics again.
Remove all electrical and optical modules from the
instrument, then run compensation again. If the instrument
passes compensation, check for the electrical and optical
module that is causing the failure.
Verify that each module is completely installed into the slot.
If the instrument still fails compensation, replace the
Acquisition assembly.
Module firmware incompatible with mainframe software
version.
Faulty module. Refer to appropriate module service manual
for further troubleshooting information.
Module not fully installed into the slot.
Module not fully installed into the slot.
Wrong channel is selected, Waveform Selector and Setup
menus.
Signal cable not connected properly.
Replace optical cables.
Replace Optical assembly or Acquisition assembly.
Male fiber-fiber connections need to be cleaned. Refer to
Table 4--1 on page 4--3.
Bad internal O/E RF amplifier de-coupling. Check tightness
of all rigid cable interconnect.
Refer to the BIOS error message table.
Power down the instrument, then restart.
Replace the ATX assembly.
Replace the Power PC circuit board assembly.
Troubleshooting
4- - 83