CDX-646, CDX-646X - Sony Car Audio Service Manual (repair manual). Page 13

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This adjustments is necessary when the system controller (IC201),
variable resistor (RV201), slider (R), slider (L), or chassis (ELV)
was replaced for any repair.

Adjustment Method:
1. Connect this set to the master unit (e.g. MDX-C7970/C7970R),

load a disc magazine, and place the set vertically as shown
below.

2. Connect the regulated power supply to the master unit, and

turn the power on.

3. Press the DISC button on the master unit and select DISC 5.

4. At this time, if the elevator shaft does not position between

comb teeth A and B at addresses 5 and 6 as shown below,
adjust the following.

5. Press repeatedly the DISC + and – buttons on the master unit

so that the elevator shafts moves from address 6 to address 5,
or from 5 to 6. At this time, adjust RV201 on the main board
so that the elevator shaft positions smoothly between comb
teeth A and B.

6. Further, place the set horizontally and make same adjustment

as mentioned above.

7. After adjustment at addresses 5 to 6 is finished, check all op-

erations from addresses 1 to 10 with the set placed vertically
and horizontally respectively to confirm that the elevator shaft
positions in a range between comb teeth A to B.

GND

+

BUS cable

compact disc changer

master unit

CONTROL connector
(CN901)

power supply

(DC 14.4 V)

RV201

comb tooth at address 6

elevator shaft

comb tooth at address 6

comb tooth at address 5

OK

NG

elevator shaft

comb tooth at address 5

A

B

A

B