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– 13 –

 Follow the assembly procedure in the numerical order given.

chuck plate

1

Move the lever (LOCK 3) in direction 

A

, and return it a little in

direction 

B

 from the position where the chuck plate is moved

down to the lower limit.

A

B

4

stop ring 2.0 (E type)

5

tension spring (DH)

2

washer 2.5

3

optical pick-up complete ass’y
Note: Insert the shaft (A) first.

shaft (A)

gear (LOAD 2)

gear (LOMINI)

marking
Fig. A

chuck plate

2

Attach the gear (LOMINI) at the position 
shown in Fig. A.

shaft (rotary prevention C)

1

Move the lever (LOCK 3)
fully in direction 

B

 to

move the chuck plate up.

B

4

stop ring 1.5 (E type)

3

Attach the gear (LOAD 1) ass’y
with its facing inside.

slit

– 14 –

1

Confirm that the slider moves in direction 

C

 to move down

the chuck plate if the gear (LOAD 1) is rotated in direction 

A

 or

the chuck plate moves up and the slider moves in direction 

D

 if

the gear is rotated in direction 

B

.

chuck plate

slider

gear (LOAD 1) ass’y

A

B

C

D

– 15 –

This adjustments is necessary when the system controller (IC302),
variable resistor (RV301), 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-C670/

C670RDS), 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 RV301 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.

comb tooth at address 6

elevator shaft

comb tooth at address 6

comb tooth at address 5

RV301

OK

NG

elevator shaft

comb tooth at address 5

A

B

A

B

power supply

GND

+

BUS cable

CDX-424RF

master unit

– 16 –

1.

Perform adjustments as given.

2.

Power supply voltage: DC14.4 V (more than 3A).

[RF  BOARD]  – Conductor Side –

Procedure:
1. Connect the oscilloscope to TP (RF) and TP (VC) on the RF

board.

2. Put the set into play mode by loading the disc.
3. Confirm that oscilloscope waveform is clear and check RF

signal level is correct or not.

Clear RF signal waveform means that the shape “≈” can be clearly distin-
guished at the center of the waveform.

[RF  BOARD]  – Conductor Side –

Procedure:
1. Connect the oscilloscope to BP11 (TE) and TP (VC) on the

RF board.

2. Put the set into play mode by loading the disc.
3. Press the 

= AMS + button, and check the traverse wave-

form*.

4. Confirm that the oscilloscope waveform is symmetrical on the

top and bottom in relation to 0 V dc, and check this level.

* Traverse waveform: This is the tracking error wave form appears

when crossing the track.

TP

(VC)

IC11

IC51

CNJ12

TP (RF)

oscilloscope

+
–

RF signal waveform

VOLT/DIV: 200 mV
TIME/DIV: 500 ns

level: 1.4 

±

 0.3 Vp-p

A

B 

0 V

A=B

traverse waveform
(100 track jump waveform)

VOLT/DIV : 500 mV
TIME/DIV : 2 ms
Center : 0 V

Traverse waveform

TP

(VC)

IC11

IC51

CNJ12

BP11

(TE)

oscilloscope

+
–