DOWNLOAD Sony HCD-V909AV / MHC-V909AV Service Manual ↓ Size: 1.48 MB | Pages: 77 in PDF or view online for FREE

— 9 —

1

 Connector

(CN402)

4

 Two screws

(+BVTT3x6)

Two claws

3

 Connector

(CN701)

2

 Connector

(CN401)

6

 Front panel assembly

5

 Three screws

(+BVTT3x6)

5

 Button (EJECT)

9

 Flat type wire (5 core)

8

 DECO board

Claws

3

 TC mechanism deck

2

 Three screws

(+BVTP2.6x8)

4

 Button (EJECT)

7

 Cassette lid (B) assembly

6

 Cassette lid (A)

assembly

1

 Push the buttons (EJECT) 

4

 and 

5

.

— 10 —

!¢

 Seven screws

(+BVTP2.6x8)

!§

 TC SW board

!¶

 Connector

(CN607)

!∞

 Two claws

!™

 Claw

!¡

 Two claws

4

 Knob (Vol)

5

 Nut

0

 Two claws

9

 Two claws

3

 HP/MIC board

2

 Bracket (HP)

1

 Two screws

(+BVTP2.6x8)

!£

 Display board

6

 Flat type wire (10 core)

7

 Seven screws

(+BVTP2.6x8)

8

 Nine screws

(+BVTP2.6x8)

(Perform after removing the front panel.)

3

 Flat type wire (8 core)

4

 Push the claws

2

 Pull-out the disc tray.

5

 Remove the disc tray.

1

 Turn the cam to the

direction of arrow.

Claw 

A

Claw 

B

Note: When installing the Disc tray, pull around the flat type wire to

     pass through the claw 

A

 and claw 

B

, as shown in the figure.

— 11 —

On this mode, the data of the color-bars signal as a picture signal
and the 1kHz sine wave signal as a sound signal are output by the
mechanism control microcomputer (IC701) for video CD signal
check. When measurement of the voltage and waveform on the
VIDEO board, perform it in this mode.
For refernce, the color-bars signal can be observed at J9001 (VIDEO
OUT) and the sound signal can be observed at J101 (VIDEO/MD
(AUDIO) OUT) using an oscilloscope.
1. Connect the lead wire to both ends of the land of SL701 (CAL

BAR) of the VIDEO board.

2. Turn the power on. Press  FUNCTION  button to select CD.
3. After 2 or 3 seconds later, connect the lead wire.
4. After measuring, remove the lead wire connected.
NOTE:
The 1 kHz sine wave is not outputted when the CD is played once,
but it is not error.

• Refer to SECTION 6 ELECTRICAL ADJUSTMENTS page 15.

1. Connect the lead wire to both ends of the land of SL702 (ADJ)

and SL703 (AFADJ) of the VIDEO board.

2. Turn the power on. Press  FUNCTION  button to select CD.
3. Short-circuit the lead wire. (At this time, “DISC” on the fluores-

cent indicator tube will blink (test mode). If it is not blinking,
perform from step 1 again.)

4. Press the  

·  button in playback.

5. Every pressing the  REPEAT  button, the tracking servo and the

sledding servo are turned on or off.

6. When the servo is OFF, the counter on front panel will not be

changed.

7. After measuring, remove the lead wire connected step 1.

SL703 (AFADJ)

IC751

IC251

SL702 (ADJ)

SL701 (CAL BAR)

— 12 —

1. Clean the following parts with a denatured alcohol-moistened

swab:

record/playback heads

pinch rollers

erase head

rubber belts

capstan

idlers

2. Demagnetize the record/playback head with a head demagne-

tizer.

3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the

parts adjusted.

5. The adjustments should be performed with the rated power sup-

ply voltage unless otherwise noted.

2 to 6 g • cm

(0.02 - 0.08 oz • inch)

36 to 61 g • cm

(0.5 - 0.84 oz • inch)

Torque

Torque meter

FWD

FWD
back tension

REV

FF/REW

REV
back tension

FWD tension

REV tension

CQ-102C

CQ-102C

CQ-102RC

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

36 to 61 g • cm

(0.5 - 0.84 oz • inch)

2 to 6 g • cm

(0.02 - 0.08 oz • inch)

61 to 143 g • cm

(0.85 - 1.99 oz • inch)

100 g or more

(3.53 oz or more)

100 g or more

(3.53 oz or more)

Meter reading

1. Demagnetize the record/playback head with a head damagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the

parts adjusted.

4. The adjustments should be performed with the rated power sup-

ply voltage unless otherwise noted.

5. The adjustments should be performed in the order given in this

service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit adjust-
ment.)

6. The adjustments should be performed for both L-CH and R-CH.
7. Switches and controls should be set as follows unless otherwise

specified.

Signal

Used for

Tape

P-4-A100

WS-48B

P-4-L300

10 kHz, –10 dB

3 kHz, 0 dB

315 Hz, 0 dB

Azimuth Adjustment

Tape Speed Adjustment

Level Adjustment

NOTE:
Set the test mode by following step before performing the adjust-
ment of “DECK SECTION”. All effects for the output signal are
canceled. If the adjustment is not performed in this test mode, you
cannot adjust correctly.

Procedure :
With the power turned ON, press the  NEXT  button,  ENTER/
NEXT  button, and  EFFECT ON/OFF  button simultaneously.
(The “VOLUME” on the fluorescent display tube will blink while
in the test mode.)
To exit the test mode, press the  POWER  button.

Note: Perform this adjustments for both decks.

Procedure:
1. Mode : Playback

test tape
P-4-A100
(10kHz, –10dB)

VIDEO/MD
(AUDIO) OUT

level meter

set

+

–