TTI QPX1200 Service Manual page 9

6. Power: Remove the 10-way connector (PJ5) to the Control board, noting polarity (corner
marker to pin1); remove the flat cable connection to PJ4 at the rear of the board; remove the
HT connection from the PFC board at FAS1 & FAS2; remove the 4-way primary AUX
connection from the PFC board at PJ1; remove the 3 2-way fan power connections
(PJ6,PJ7, PJ8); remove the 2 M6 barb nuts which secure the output cables to the front
panel. To release the Power board from the chassis it is first necessary to remove the 3
internal, fan; push out the centres of the 2 plastic push-rivets which secure the top of the fan
to the bracket and lift out the fan with its lower bracket still attached. When re-assembling
note that the fan label faces the transformer (airflow towards the transformer). Remove the
10 M3 screws (with integral shakeproof washer) from the underside of the chassis, leaving
the support pillars attached to the board assembly, and lift the assembly forward and up.
7. Interface: Remove the 3-way connection to the Keyboard at PJ3. The Interface board is
secured only by the RS232 screwjacks; undo these to release the board.
8. When reassembling, take great care to ensure that all connections are exactly as before
dismantling and that no insulation creepage and clearance distances have been
compromised. Ensure that only the correct fasteners have been used otherwise earthing,
and hence EMC and safety performance, may be impaired.
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