Disassembly For Servicing - Arcam ALPHA Service Manual

same winding are regulated by Z401, providing the - 20V rail required by the fluorescent display.
There is an additional winding that powers the filament on the display via pass transistor Q403.
Pressing the front panel 'Display' button toggles flip-flop Z405, switching Q403 (and therefore the display) on
and off.
The supply to the audio board is +25V, -25V with an analogue ground.
ANTI STATIC PRECAUTIONS MUST BE OBSERVED
1. Remove the cover by removing the 4 side screws and 4 rear screws. Slide the cover backwards and
up.
2. Remove the 4 side screws holding the front panel on and one screw from the centre of the front panel
accessed from inside the unit. The front should now pull off.
3. Remove the 2 screws from the digital and audio output sockets on the audio board.
Squeeze the pcb pillar in the centre of the audio board and pull the board up. It will
be tight because of the connectors between the audio and monoboards.
NOTE: Because the master clock is on the audio board the unit will not function with the
audio board removed from the player.
4. Push the tray of the CD player forward to reveal a mounting screw at the rear of the mechanism
chassis. Remove this screw.
5. Remove 4 screws situated on the mono board close to the corners of the
transformer.
6. Remove the 2 screws connecting the rear panel to the mains inlet socket and squeeze the top of
the 2 pcb pillars.
The monoboard, complete with mechanism, sub front and display board should now be
free and can be pulled up and out of the chassis.
The display board can be removed, if necessary, by removing the 2 screws on the
front and squeezing the pcb pillars. The board can then be pulled off its 2
connectors.
The mechanism can be removed by removing 2 screws from the sub front and
2 screws from the underside of the monoboard. Unclip the 3 connectors from the
mechanism to monoboard.
Lift the mechanism up carefully and release the flexible pcb from the mechanism to
monoboard. The mechanism can now be removed fully.
NOTE:- You must fit a paper clip across the end of the flexible pcb to prevent static
damage to the laser whilst it is out of the case.

DISASSEMBLY FOR SERVICING

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