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R&S FSP
Module Replacement
1164.4556.82 3.33
E-1
Replacing the Module RF Attenuator A40
(See chapter 5, spare parts list, items 20, 30, 35, and explosion drawing 1164.4391.)
The RF attenuator is fitted at the bottom side behind the RF input connector.
There are different models of the attenuator for instruments up to 7 GHz (20), 30 GHz (30) and 40 GHz
(35).
Opening the Instrument and Removing the RF Attenuator
Switch off the instrument, pull the mains plug, unscrew the 4 rear-panel feet (450) and push the tube
(410) backwards and take off.
Place the instrument on the left side and unscrew the RF cable or the diplexer (150, only with R&S
FSP30) at the RF output of the RF attenuator.
Unscrew the two screws with washers (40) at the right frame.
Note
: The RF attenuator will only be fixed with the RF cables at the front.
Disconnect RF-cable W1 (295), (315) or (322) at the input of the RF attenuator.
Move carefully out the RF attenuator and disconnect the flexible RF-cable at the input.
Disconnect ribbon cable at motherboard connector X40.
Installing the New RF Attenuator and Completing the Instrument
Connect the ribbon cable of the new RF Attenuator (20), (30) or (35) at motherboard connector X40.
Connect the flexible RF-cable at the input of new RF Attenuator (see label on cable)
Move the new RF Attenuator in the instrument and connect cable W1 (295), (315) or (35) at the
input.
Screw the two screws with washers (40) at the right frame in the RF attenuator.
Screw the RF cable or the diplexer (150, only with R&S FSP30) at the RF output of the RF
Attenuator.
Push the tube (410) on the instrument and mount the 4 rear-panel feet (450).
A cold boot is necessary after replacing the attenuator.
See section "Performing a Cold Boot" in this chapter.
Connect the instrument to the mains, switch on the instrument power switch and switch on the
instrument with the ON/STANDBY key
After starting the instrument check for system messages:
-
[
SETUP
: SYSTEM INFO : SYSTEM MESSAGES
]
Start selftest and check results:
-
[
SETUP
: SERVICE : SELFTEST ], then [SELFTEST RESULT]
Start a total calibration and check the result:
-
[
CAL
: CAL TOTAL ] , then [ CAL RESULTS ]
Create a backup of the EEPROM data (see chapter 2, section "Adjustment of Module Data").
Check frequency response with chapter 1 and make a correction if necessary.
Содержание 1164.4391.03
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