Tektronix DSA8300 Service Manual page 100

Troubleshooting
Table 4-2: Possible causes of instrument failure (cont.)
Failure symptom
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
4–52
Possible cause(s) / solutions
Module not fully installed in the slot.
Wrong channel is selected, Waveform Selector and Setup menus.
Signal cable not connected properly.
Replace optical cables.
Replace optical module or Time Base assembly.
Male fiber-fiber connections need to be cleaned.
Bad internal O/E RF amplifier de-coupling. Check tightness of all rigid cable
interconnects.
Refer to the BIOS error message table. (See Table 4-3.)
Power off the instrument, and then restart.
Replace the ATX assembly.
Replace the Power PC circuit board assembly.
DSA8300 Digital Serial Analyzer and Modules Service Manual