Rohde & Schwarz 1164.4391.03, Service Manual

Page: 180 / 254

Troubleshooting R&S FSP
1164.4556.82 3.76 E-1
Normal action Error and error cause
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.
If an error occurred on the
detector board or the clock is
missing, the following message
is displayed:
SYSTEM MESSAGE
DETECTOR:Access failed, check HW
component !
OK
In this case, first check the clock
generation in the instrument.
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.
The following measurements
are appropriate to check the
reference supply:
Measurement: Result:
RF frontend A100, X114: rated
value 128 MHz, 0 dBm No signal:
replace frontend.
IF filter A130, X135:
rated value 128 MHz, 0 dBm No signal:
replace IF filter.
IF filter A130, X141:
rated value 32 MHz, 0 dBm No signal:
replace IF filter.
If no error occurs with the clock generation,
booting can be continued by acknowledging the
error message entering "OK“
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.