Philips SPENDEX 40 Maintenance Manual page 56

NATO CONFIDENTIAL
SPENDEX 40 UA 8251/00 AND /Ol
LIMITED MAINTENANCE MANUAL
- Loosen the 12 captive M4 socket head screws, with which the front
panel is fixed to the housing. Use for this purpose a round head
screwdriver, size 3;
- Take the front panel from the housing without damaging the packing.
The packing should remain in the front panel;
*
ATTENTIONfl
AS SOON AS THE FRONT PANEL IS TAKEN FROM THE HOUSING THE
ZEROISE SWITCH ON THE CONNECTING BOARD WILL BE OPENED, AS A
RESULT OF WHICH ANY POSSIBLE KEY VARIABLES ARE ZEROISED
IMMEDIATELY.
- Release the flat cable connectors X32, X28, X26, X24 and X22
carefully (see Fig. 7.1);
- Detach the earth wire from the mother board.
7.3.2 Demounting of the connecting board
- Demount the front panel as described in § 7.3.1;
- Loosen the 8 M3 socket head screws, with which the connecting board
is fixed in the housing. Use for this purpose a round head
screwdriver, size 2.5;
- Remove the socket head screws, including the plain washers and the
retaining Belleville washers;
- Pull the connecting board carefully loose from connector X2 of the
mother board and take the board out of the housing.
7 . 3 . 3 D e m o u n t i n g o f t h e m a i n s / l i n e fi l t e r ( b a c k c o v e r )
- Loosen the 14 captive M4 socket head screws, with which the
mains/line filter is fixed to the housing. Use for this purpose a
round head screwdriver, size 3;
- Take the mains/line filter from the housing without damaging the
packing. The packing should remain in the housing;
- Release the flat cable connector X56 and the blue connectors X53,
X57, X59 and X61 carefully (see Fig. 7.2);
- Loosen the 2 M2.5 screws, with which connector X76 is fixed to the
bottom of the power supply compartment;
- Remove the screws and loosen connector X76.
-
7 . 3 . 4 D e m o u n t i n g o f t h e l i n e i n t e r f a c e b o a r d
The line interface board and the modem make up an assembly. The whole
is mounted in the line interface compartment of the housing.
- Demount the mains/line filter as described in § 7.3.3;
- Release the flat cable connectors X50 and X52 and the blue
connector X63 carefully (see Fig. 7.2);
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NATO CONFIDENTIAL