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– 13 –

–tuner board (component side)–

TU1

IC1

CFT1

AM IF 

ADJUSTMENT

CT5

L5

LW

TRACKING

ADJUSTMENT

CT4

L3

MW

TRACKING

ADJUSTMENT

L4

LW

FREQUENCY

COVERAGE

ADJUSTMENT

– 14 –

This adjustment is to be done when the optical pick-up is replaced.

1. Connect the oscilloscope to TP (TRACKING-Y) and TP (VC)

on the CD board.

2. Insert the disc (YEDS-18) in and close the lid (CD).
3. Put the set into test mode.
4. Press the 

+ and = buttons to move the optical pick-up to

the center.

5. Press the 

( button.

From focus searching, focus is turned ON while entering
CLV drawing-in mode. Tracking and sled are turned OFF.

6. Adjust RV703 so that the oscilloscope traverse waveform is sym-

metrical, as shown in the figure below.

A

B

0 V

A

B

0 V

A=B

Note: Take long sweep time

for easy monitoring.

VOLT/DIV: 0.2 V (with the 10:1 probe in use.)
TIME/DIV: 1 ms

A=B

Adjustment value: 0.4 

±

 0.2 Vp-p (A + B)

7. Release the test mode after adjustment is completed.

Adjustment Location: CD board (See page 17.)

+
–

CD board

TP (TRACKING-Y)

TP (VC)

oscilloscope

(DC range)

TEST 1
Terminal

1. Be sure to disconnect the AC plug cord and remove the solder

bridge at the TEST1 terminal connected before in setting.

2. The set thus becomes available for normal operation

Put the set into test mode and perform the following checks.
Repair if there are any problems.

Press the 

+, = buttons and confirm that the optical pick-up

moves smoothly from the innermost to outermost circumference
and back smoothly and with no catching or abnormal noises.

+ : Optical pick-up moves to the outer circumference
= : Optical pick-up moves to the inner circumference

1. Press the 

( button. (Focus search operation is performed con-

tinuously.)

2. Look at the optical pick-up objective lens and confirm that it

moves up and down smoothly, when no catching or abnormal
noises.

3. Press the 

p button.

Confirm that focus search operation stops. If it does not , press
the 

p button again longer.

Note: When the malfunction is occurred by mis-passing other keys, turn

off the power and check again from making the test mode.

1. Perform adjustment in test mode.

After adjustments, be sure to release test mode.

2. Perform adjustments in the order given.
3. Use the disc (YEDS-18. Part No. 3-702-101-01) only when so

indicated.

1. Disconnect an AC plug cord. (Power is not applied to the set.)
2. Solder across the TEST1 terminal.
3. Close the lid (CD).
4. Connect an AC plug cord.

– 15 –

This adjustment is to be done when the optical pick-up is replaced.

1. Connect the oscilloscope TP (RF) and TP (VC) on the CD board.
2. Insert the disc (YEDS-18)  in and close the lid for CD.
3. Put the set into test mode. (See page 14.)
4. Press 

+ and = buttons to move the optical pick-up to the

center. (Move the optical pick-up to the music area on the disc
to enable easy visibility of the eye pattern.)

5. Press the 

( button.

From focus searching, focus is turned ON while entering
CLV drawing-in mode. Tracking and sled are turned OFF.

6. Press the 

( button.

[Both tracking and sled are turned ON.]

7. Adjust RV701 so that the oscilloscope waveform is as shown in

the figure below. (eye pattern)
A good eye pattern means that the diamond shape (

≈

) in the

center of the waveform can be clearly distinguished.

VOLT/DIV : 0.2 V (With the 10:1 probe in use)
TIME/DIV  : 500 ns

1.3 

±

 0.2 Vp-p

+
–

CD board

TP (RF)

TP (VC)

oscilloscope

(AC range)

When observing the eye pattern, set the oscilloscope for AC
range and raise vertical sensitivity.

8. Release the test mode after adjustment is completed.

Adjustment Location: CD board (See page 17.)

Gain

Focus

Tracking

Symptoms

• The time until music starts becomes

longer for 

p

→

( on automatic

selection.

low

low or high

(

=, + buttons pressed.)

(Normally takes about 2 seconds.)

• Music does not start and disc

—

low

continues to rotate for 

p

→

( or

automatic selection.
(

=, + buttons pressed.)

• Sound is interrupted during PLAY.

Or time counter display stops

—

low

progressing.

• More noise during 2-axis device

high

high

operation.

A frequency response analyzer is necessary in order to perform this
adjustment exactly.
However, this gain has a margin, so even if it is slightly off, there is
no problem. Therefore, do not perform this adjustment.
Focus/tracking gain determines the pick-up follow-up (vertical and
horizontal) relative to mechanical noise and mechanical shock when
the 2-axis device operate.
However, as these reciprocate, the adjustment is at the point where
both are satisfied.
• When gain is raised, the noise when the 2-axis device operates

increases.

• When gain is lowered, mechanical shock and skipping occurs

more easily.

• When gain adjustment is off, the symptoms below appear.

– 16 –

The following is a simple adjustment method.

Since exact adjustment cannot be performed, remember the posi-
tions of the controls before performing the adjustment. If the posi-
tions after the primary adjustment are only a little different, return
the controls to the original position.

+
–

TP (FOCUS-Y)

TP (TRACKING-Y)

TP (VC)

oscillosope
(DC range)

CD board

Procedure:
1. Keep the set horizontal.

If the set is not horizontal, this adjustment cannot be performed
due to the gravity against the 2-axis device.

2. Connect the oscilloscope TP (FOCUS-Y) and TP (VC) on the

CD board.

3. Insert the disc (YEDS-18) in and close the lid for CD.
4. Put the set into test mode. (See page 14.)
5. Press the 

( button.

From focus searching, focus is turned ON while entering
CLV drawing-in mode. Tracking and sled are turned OFF.

6. Press the 

( button.

[Both tracking and sled are turned ON.]

7. Adjust RV702 so that the waveform is as shown in the figure

below. (Focus gain adjustment)

100 mV

0 V

low focus gain

0 V

250 mV

high focus gain

VOLT/DIV: 100 mV
TIME/DIV:2ms

VOLT/DIV: 100 mV
TIME/DIV:2ms

VOLT/DIV: 100 mV
TIME/DIV:2ms

100 mV
75 mV

0 V

• Inconnect Examples (DC level changes more than on adjusted

waveform)

high tracking gain
high fundamental wave
than for low gain

VOLT/DIV: 1 V
TIME/DIV:2 ms

0 V

low tracking gain

VOLT/DIV: 1 V
TIME/DIV: 2ms

0 V

0 V

VOLT/DIV: 1 V
TIME/DIV: 2ms

8. Connect the oscilloscope to TP (TRACKING-Y) and TP (VC)

on the CD board.

9. Adjust RV704 so that the waveform is as shown in the figure

below. (tracking gain adjustment)

• Incorrect Examples (fundamental wave appears)

VOLT/DIV: with the 10:1 probe in used.

10. Release test mode after adjustment is completed.

Adjustment Location: CD board (See page 17.)