CMU MODULE Replacement
1100.4903.82 3.51 E-4
Replacing the MOTHERBOARD
(see chapter 5, spare part list, Current No. 620 (MOTHERBOARD1), Current No. 630
(MOTHERBOARD2), Current No. 660 (FRONTPANEL BOARD), Current No. 640 (REARPANEL
BOARD1), Current No. 650 (REARPANEL BOARD2) and explosion drawing 1100.0008.01 D)
The MOTHERBOARD consists of five parts: MOTHERBOARD1, MOTHERBOARD2, FRONTPANEL
BOARD, REARPANEL BOARD1 and REARPANEL BOARD2.
For replacement of the individual parts proceed as follows:
MOTHERBOARD1 (big MOTHERBOARD)
Opening the instrument and removing MOTHERBOARD1
½ Switch off the instrument, pull the mains plug and unscrew the rear-panel feet.
½ Place the instrument onto the front carrying handles, push the tube upwards and take off.
½ After unscrewing the two countersunk screws at the top left instrument frame slightly lift the cover at
the top of the instrument, slightly shift towards the right and lift off.
½ Loosen all connecting cables to the boards, then lever out all boards as described above using the
two levers at the right and at the left.
½ Likewise, remove the POWER SUPPLY and the FRONT MODULE, disconnect the ribbon cable
connections to the RF-FRONTEND, MOTHERBOARD2, FRONTPANEL BOARD, REARPANEL
BOARD1 and REARPANEL BOARD2. Disconnect the fan connecting cable and remove the Option
OCXO REFERENCE OSC, if installed.
½ Remove the partition inserted between air duct and module support as reinforcement by unscrewing
the four screws.
½ Place the instrument upside down and unscrew all the five combi screws on MOTHERBOARD1, then
slightly shift MOTHERBOARD1 towards the rear until the six motherboard supports slide out of the
keyholes. Then swing out MOTHERBOARD1 towards the top.
Installing the new MOTHERBOARD1 and completing the instrument
½ Insert new MOTHERBOARD1 and connect all connectors and modules in the reverse order.
½ Complete the instrument without causing damage to the cables.
½ Connect the instrument to the mains and switch on.
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