MDX-65 - Sony Car Audio Service Manual (repair manual). Page 3

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BP1

BP2

MDX-65

Master unit
(CDX-C880,
 C880R, etc.)

BUS CONTROL IN

BUS CONTROL OUT

The this set has no key control function and cannot be placed into
the Playback mode alone.
For key control, the this set is controlled through serial
communication with a master unit (car audio player, TV tuner or
source selector compatible with the Sony BUS system.)
To service the this set, the set should be connected as given below:

1. Remove the panel (rear) assy, case (upper) and panel (front) assy.

Then, remove the main board from the mechanism deck. (See
page 8 of “SECTION 3. DISASSEMBLY”.)

2. Remove the chassis (OP) block from the mechanism deck. (See

page 10 of “SECTION 3. DISASSEMBLY”.)

3. Short each bridge points BP1 and BP2 on the main board by

solder bridge.

– main board (conductor side) –

4. Connect the power board with the main board by the main

flexible board. Connect the main board with the servo board by
the servo flexible board.

5. Connect to a master unit. With the master unit OFF, press the

preset buttons 4 

n 5 n 1 (2 seconds or more each) in this

turn to enter the TEST mode.

6. Open the doors and insert a disc in the chassis (OP) assy. Use

the  SOURCE  button on the master unit to select to MD to
playback.

7. Check the waveforms at each point on the servo board.

After this check is completed, remove solder between
shorted bridge points BP1 and BP2 and open these points.