M O U N T I N G - Philips SPENDEX 40 Maintenance Manual

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NATO CONFIDENTIAL
S P E N D E X 4 0 U A 8 2 5 1 / 0 0 A N D / O l L I M I T E D M A I N T E N A N C E M A N U A L
of the housing;
- Loosen the 5 M3 socket head screws, with which the timing board is
fixed. 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;
- Take away the timing board.
7.3.14 Demounting of the telephony board
The telephony board and the timing board make up an assembly. The
whole is mounted in the red compartment of the housing on position
6/7.
- Demount the cradle as described in § 7.3.6;
- Demount the upper cover as described in § 7.3.7;
- Pull the timing board/telephony board assembly loose from the
connectors X13 and X15 of the mother board and take the whole out
of the housing;
- Loosen the 5 M3 socket head screws, with which the telephony board
is fixed. 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;
- Take away the telephony board.
7.3.15 Demounting of the power supply unit
- Loosen the 12 captive M4 socket head screws, with which the power
supply unit is fixed in the housing. Use for this purpose a round
head screwdriver, size 3;
- Take the power supply unit out of the apparatus without damaging
the packing. The packing should remain in the housing;
- Loosen the 4 M2.5 screws, with which the connectors X70 and X71
are fixed on the bottom of the power supply compartment (see Fig.
7 . 3 ) ;
- Remove the screws, including the mounting strip and release the
connectors X70 and X71.
7 . 4 M o u n t i n g
7 . 4 . 1 M o u n t i n g o f t h e f r o n t p a n e l
- Connect the earth wire to the second pin to the left at the bottom
of the mother board (see Fig. 7.1);
- Connect the flat cable connectors X32, X28, X26, X24 and X22 to the
connecting board;
- Place the front panel against the housing. See to it that the
various connections with the connecting board do not get jammed;
- Tighten the 12 captive socket head screws;
- Affix a new USFA-sealing strip.
9 9 2 2 1 5 4 1 3 4 3 1 7 - 6
NATO CONFIDENTIAL