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17

TUNER BOARD

C27

C10

R5

JC3

C12

R28

C44

Q3

C45

C43

C51

C5

R7

R4

D2

C6

R2

R3

C7

R32

Q2

Q4

R6

C8

C46

C47

C4

L7

C54

C11

R13

C26

R14

C9

R30

D4

D8

D9

D5

R31

D6

D7

9

JW2

JW7

CT4

JW6

8

D3

L4

L2

JW10

L5

JW5

Q1

FL1

CT3

L3

CT2

JW4

JW3

JW1

+

—

Digital

JW4

(VT)

100K

Ω

voltmeter

RADIO BAND button : MW or LW
Volume : MIN

RADIO BAND button : FM
Volume : MIN

Put the lead-wire
antenna close to
the supplisd MW/LW
loop  antenna.

AM RF signal
generator

30% amplitude modulation by 400Hz
signal.
Output level : as low as possible

telescopic
antenna
terminal

FM RF signal
generator

22.5kHz frequency deviation by
400Hz signal.
Output level : as low as possible

0.01 uF

Adjustment Location : Tuner board (See page 18)

• Repeat the procedures in each adjustment several times, and the

frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.

Adjust for a maximum reading on level meter.

T1

450kHz

Adjust part

Frequency display

 L5

531kHz

Confirmation

1,611kHz

reading on digital

voltmeter.

Adjustment value: 1.0V

Standaed value: 0.7 to 1.3V

5.1  to  5.9V

Adjust for a maximum reading on level meter.

L 3

621kHz

CT2

1,404kHz

Adjust part Frequency display

CT4

 279kHz

Adjustment value: 5.4 to 6.0V

Confirmation

153kHz

 0.4 to 1.1V

reading on digital

voltmeter

Adjust for a maximum reading on level meter.

L 4

162kHz

CT3

261kHz

Adjust part Frequency display

Confirmation

 87.5kHz

1.4 to 2.4V

Confirmation

108kHz

2.7 to 3.7V

reading on digital

voltmeter

Adjust for a maximum reading on level meter.

L6

10.7MHz

Adjust for a maximum reading on level meter.
L1

87.5MHz

CT1

108MHz

47K

Ω

level meter

set

LINE OUT

+

–

(SIDE B)

18

L5 : MW Frequency
       Coverage Adjustment

CT4 : LW Frequency Coverage Adjustment

T1 : AM IF Adjustment

L6 : FM IF Adjustment

L3 : MW Tracking Adjustment

CT2 : MW Tracking Adjustment

CT1 : FM Tracking Adjustment

L4 : LW Tracking Adjustment

CT3 : LW Tracking Adjustment

L1 : FM Tracking Adjustment

[TUNER BOARD] 
(Component side)

19

1. PARTS REPLACEMENT AND ADJUSTMENT
• Check and adjust the mechanism deck as follows.

The procedure changes according to the part replaced.

• Laser power check
• Focus bias check
• C PLAY check
• Self-recording/playback check

Parts Replacement and Repair

NG

Has the OWH been replaced?

NO

OK

NO

NO

NO

Has OP, IC603, IC502, or 
IC504 been replaced?

YES

YES

Initial setting of the adjustment value

Has OP or IC603 been replaced?

YES

IOP information recording
(IOP value labeled on OP)

Has IC603 or D501 
been replaced?

YES

Temperature compensation offset adjustment

• Laser power adjustment
• EF balance adjustment
• Focus bias adjustment
• Error rate adjustment
• Focus bias check
• Auto gain adjustment

Check the sled and spindle 
mechanisms. 
Other causes can be suspected.

• Abbreviation

OP

: Optical pick-up

OWH : Overwrite head

20

To check the emission of the laser diode during adjustments, never
view directly from the top as this may lose your eye-sight.

As the laser diode in the optical pick-up is easily damaged by static
electricity, solder the laser tap of the flexible board when using it.
Before disconnecting the connector, desolder first. Before connect-
ingthe connector, be careful not to remove the solder. Also take
adequate measures to prevent damage by static electricity. Handle
the flexible board with care as it breaks easily.

4. PRECAUTIONS FOR ADJUSTMENTS
1. When replacing the following parts, perform the adjustments

and checks with in the order shown in the following table.

2. Set the test mode when performing adjustments.

After completing the adjustments, release the test mode.
Perform the adjustments and checks in “group S” of the test
mode.

3. Perform the adjustments to be needed in the order shown.

4. Use the following tools and measuring device.

• Check Disc (MD) TDYS-1

(Part No. 4-963-646-01)

• Test Disc (MDW-74/AU-1) (Part No. 8-892-341-41)
• Laser power meter LPM-8001 (Part No. J-2501-046-A)

or MD Laser power meter 8010S (Part No. J-2501-145-A)

• Oscilloscope (Measure after performing CAL of prove)
• Digital voltmeter
• Thermometer

5. When observing several signals on the oscilloscope, etc., make

sure that VC and ground do not connect inside the oscilloscope.
(VC and ground will become short-circuited)

6. Using the above jig enables the waveform to be checked with-out

the need to solder.
(Refer to Service Note on page 3)

7. As the disc used will affect the adjustment results, make sure

that not dusts nor fingerprints are attached to it.

When performing laser power checks and adjustment (electrical
adjustment), use of the new MD laser power meter 8010S (Part No.
J-2501-145-A) instead of the conventional laser power meter is con-

venient.

It sharply reduces the time and trouble to set the laser power meter
sensor onto the objective lens of optical pick-up.

5. CREATING CONTINUOUSLY-RECORDED DISC
* This disc is used in focus bias adjustment and error rate check.

The following describes how to create a continuous recording
disc.

1. Insert a disc (blank disc) commercially available.
2. Turn the JOG dial to display “CREC MODE”.
3. Press the  YES/ENTER  button again to display “CREC MID”.
Display “CREC (0300)” and start to recording.
4. Complete recording within 5 minutes.
5. Press the NO/CANCEL button and stop recording.
6. Press the  Z  (MD) button and remove the disc.
The above has been how to create a continuous recorded data for
the focus bias adjustment/check and MO error rate check.
Note:
• Be careful not to apply vibration during continuous recording.

flexible board

laser tap

pick- up

Optical pick-up flexible board

2.Temperature

compensation
offset adjustment

1. Recording of IOP

information
(Value written in
the pick-up)

3.Laser power

adjustment

4.EF balance

adjustment

5.Focus bias

adjustment

6.Error rate check

Optical

Pick-up

BD Board

IC603

D501

IC502, IC504

IC506