Rohde & Schwarz 1164.4391.03, Service Manual

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Module Replacement R&S FSP
1164.4556.82 3.34 E-1
Replacing the Key/Probe Module A80 and Vol./Phone Board A191
(Option R&S FSP-B3)
(See chapter 5, spare parts list, items 50 and 1040, and explosion drawings 1164.4391, 1129.6450. )
The boards are fitted behind the front panel connectors Keyboard, Probe, Headphone and the volume
control knob.
Opening the Instrument and Removing the Boards
Switch off the instrument, pull the mains plug, unscrew the 4 rear-panel feet (450) and push the tube
(410) backwards and take off.
Unscrew the four screws (430) of the front handles on both sides and take off the front handles.
Remove the volume control knob (Option R&S FSP-B3), if present, by pulling it off.
Pull off the labelling panel (270) towards the front.
Remove three countersunk screws (70) at the frame and 1 countersunk screw (70) at the connector
mounting plate (60).
Unscrew the cable W1 (310), W1 (315) or (322) at the RF attenuator (20) or (30).
Remove the mounting plate (60) completely with W1 and Probe/Key board (50) and option
Vol./Phone Board (1040) to the front side.
Note : The Probe/Key (50) and Vol./Phone boards (1040) are connected with a ribbon cable to the
motherboard X80 and X81.
Disconnect the ribbon cable at the motherboard connector X80 and X81.
Unscrew the three countersunk screws (55) and remove the board Key-Probe (50).
Undo the three countersunk screws (1060) and remove the board Vol./Phone Board (1040) from
mounting plate (60) .
Undo the screw with washers (1055) and the nut of the volume control at the mounting plate (1050)
and remove Vol./Phone Board (1040) .