Rohde & Schwarz FSP3 Service Manual page 180

Troubleshooting
Normal action
When the program has been loaded, the measurement hardware is
initialized first. A timer which is controlled by a 32-MHz clock signal
is set on the detector board. This test reveals proper functioning of
the detector board and the clock oscillator in the R&S FSP
(frontend).
After passing the function tests, the analog boards are initialized and
the correction data EEPROMs are loaded.
The reference is generated on the frontend module. The 128-
MHz reference supplied by the frontend is decoupled in the IF
filter and distributed to the detector board and the options.
If no error message or any other information on the error source was issued with booting, the error can
only be determined by replacement of the detector board or the front-module controller.
1164.4556.82
Error and error cause
If an error occurred on the
detector board or the clock is
missing, the following message
is displayed:
DETECTOR:Access failed, check HW
component !
In this case, first check the clock
generation in the instrument.
Measurement:
RF frontend A100, X114: rated
value 128 MHz, 0 dBm
IF filter A130, X135:
rated value 128 MHz, 0 dBm
IF filter A130, X141:
rated value 32 MHz, 0 dBm
If no error occurs with the clock generation,
booting can be continued by acknowledging the
error message entering "OK"
3.76
R&S FSP
SYSTEM MESSAGE
OK
The following measurements
are appropriate to check the
reference supply:
Result:
No signal:
replace frontend.
No signal:
replace IF filter.
No signal:
replace IF filter.
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