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13

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 3A)
fully in the direction of arrow 

B

 

to move the chuck plate up.

B

4

stop ring 1.5 (E type)

3

Attach the gear (LOAD CAM) assy
with its facing inside.

slit

1

Confirm that the slider moves in the direction of arrow 

C

 to move down

the chuck plate if the gear (LOAD CAM) is rotated in the direction of arrow

A

 or the chuck plate moves up and the slider moves in the direction of

arrow 

D

 if the gear is rotated in the direction of arrow 

B

.

chuck plate

slider

gear (LOAD CAM) assy

A

B

C

D

14

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

15

1. This check is performed with the set placed horizontally.
2. Power supply voltage: DC14.4 V (more than 3 A).
3. Be sure to use the disc “YEDS-18” parts code: 3-702-101-01, but only

when indicated.

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

RF board.

2. Put the set into play mode by loading the disc (YEDS-18).
3. Confirm that oscilloscope waveform is clear and check RF sig-

nal level is correct or not.

Clear RF signal waveform means that the shape “

◊

” can be clearly distin-

guished at the center of the waveform.

When observing the eye pattern, set the oscilloscope to AC range
and raise the vertical sensitivity so that it may be easily seen.

GND

+

BUS cable

compact disc changer

master unit

CONTROL connector
(CN901)

power supply

(DC 14.4 V)

±

oscilloscope

(AC range)

+
–

TP (VC)

TP (RFAC)

IC101

16

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

board.

2. Put the set into play mode by loading the disc (YEDS-18).
3. Press the 

[       AMS       ]

 button on the master unit, and check

the traverse waveform*.

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.

oscilloscope

(DC range)

+
–

TP (VC)

TP (TE)

IC101

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