DOWNLOAD Sony CMT-SE9 / MDS-SE9 Service Manual ↓ Size: 6.94 MB | Pages: 77 in PDF or view online for FREE

29

Procedure :
1. Press the [FUNCTION] button to select TAPE. (HCD-SE9)
2. Insert a tape into deck, press the [TAPE REC] button, and then

press the  

TAPE

 X  button to start recording.

3. Mode : Record

4. Mode : Playback

5. Confirm playback the signal recorded in step  become adjustment

level as follows
If these levels do not satisfy adjustment level, adjust the RV241
(L-CH) and RV291 (R-CH) on the MAIN board to repeat steps
3 and 4.

Adjustment level : The playback output of 10kHz level difference

against 315Hz reference should be 0 

±

 3.0dB.

Adjustment Location :

AF OSC

1) 315 Hz
2) 10 kHz

blank tape
CS-123

set

attenuator

600 

Ω

50 mV (–23.8 dB)

MD/TAPE OUT   (J401)

recorded
position

level meter

set

MD/TAPE OUT   (J401)

Tape speed Adjust 

RV321

RV291

Record Bias Adjust (R-CH)

RV241

Record Bias Adjust (L-CH)

4.

After the adjustments, apply suitable locking compound to the
parts adjusted.

Procedure:
1.

MODE : FWD Playback.

2.

Insert the WS-48B into deck.

3.

Press the  

TAPE

 Y  button of deck.

4.

Check the reading of frequency counter becomes 3000 ± 90
Hz. If these level do not satisfy adjustment level, adjust the
RV321.

W.RMS (JIS) less than 0.35%
(test tape: WS-48B)

3.

Mode: Playback

test tape
P-4-A100
(10kHz, –10dB)

oscilloscope

set

Waveform of oscilloscope

in phase

45

°

90

°

135

°

180

°

good

wrong

V

H

R-ch

L-ch

GND

R-CH

MD/TAPE OUT   (J401)

L-CH

test tape
WS-48B
(3kHz, 0dB)

frequency
counter

set

MD/TAPE OUT   (J401)

30

Other faults are suspected.
Check the mechanism parts (spindle motor, sled motor, etc.).

Start

NG

NG

NG

OK

OK

OK

Laser Power Check

6-2.

(See page 33)

6-3.

(See page 33)

6-4.

(See page 34)

Iop Compare

Auto Check

Replace optical pick-up or MDM-7S2D

If malfunctions caused by optical pick-up such as sound skipping are suspected, follow the following check.

31

YES

NO

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

Start

IC195 replacement

OP or IC195 replacement

IC101, IC195 or D101 

replacement

OP, IC993 or IC195 

replacement

After turning the power off and on, initialises the non-volatile 
memory (EEPROM).

7. Initial setting of adjustment value (See page 36)

9. Temperature compensation offset adjustment (See page 36)

10. Laser power adjustment (See page 36)

OP, IC701, IC933 or IC195 

replacement

OP, IC101, IC201 or IC195 

replacement

OP replacement

Spindle motor replacement

6-4. Auto check (See page 34)

End

11. Iop NV save (See page 37)

12.Traverse adjustment (See page 37)
13. Focus bias adjustment (See page 38)
16. Auto gain control output level adjustment (See page 39)

In Err display mode, write OP change Iop

In Err display mode, Spdl change

•Abbreviation
OP: Optical pick-up

32

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 handling it.
Before disconnecting the connector, perform soldering bridge to the
laser tap. Before connecting the 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.

pick-up

flexible board

laser tap

1. When replacing the following parts, perform the adjustments

and checks with 

 in the order shown in the following table.

2. Set the MD test mode when performing adjustments.

After completing the adjustments, exit the MD test mode.
Perform the adjustments and checks in “Group Service” of the
MD test mode.

3. Perform the adjustments to be needed in the order shown.
4. Use the following tools and measuring devices.
•

Check Disc (TDYS-1) (Part No. : 4-963-646-01)

•

Test Disk (MDW-74/GA-1) (Part No. : 4-229-747-01)

•

Laser power meter LPM-8001 (Part No. : J-2501-046-A)
or
MD Laser power meter 8010S (Part No. :  J-2501-145-A)*

1

• Oscilloscope (Measure after performing CAL of prove.)
• Digital voltmeter
• Thermometer
• Jig for checking BD board waveform

(Part No. : J-2501-196-A)

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 without

the need to solder.
(Refer to Servicing Notes on page 11)

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

that no dusts nor fingerprints are attached to it.

*

1

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

7.

Initial setting of adjustment value

8.

Recording of Iop information

9.

Temperature compensation

offset adjustment

10. Laser power adjustment

11. Iop NV Save

12. Traverse adjustment

13. Focus bias adjustment

16. Auto gain adjustment

6-4. AUTO CHECK

Optical

Pick-up

IC101

IC701

IC201

IC993

IC195

D101

Parts to be replaced

Adjustment

Before starting adjustment:
The adjustment value differs depending on the types (KMS-262A
or KMS-262E) of optical pickup. Be sure to confirm the type name
before starting adjustment.

pink

: KMS-262A

white : KMS-262E

UV adhesive = 

UV adhesive 

Optical pick-up
(KMS-262A/262E)