DOWNLOAD Sony HCD-VP800AV / MHC-VP800AV Service Manual ↓ Size: 10.51 MB | Pages: 89 in PDF or view online for FREE

13

[Cold Reset]
• The cold reset clears all data including preset data stored in the

RAM to initial conditions. Execute this mode when returning
the set to the customer.

Procedure:
1. Press three buttons  x  ,  DISPLAY  , and  DISC 1

simultaneously.

2. The fluorescent indicator tube becomes blank instantaneously,

and the set is reset.

[Tuner Step Change] (Except for European and Middle Eastern
models)
• A step of AM channels can be changed over between 9 kHz and

10 kHz.

Procedure:
1. Press  `/1  button to turn the set ON.
2. Select the function “TUNER”, and press  TUNER/BAND  button

to select the BAND “AM”.

3. Press   `/1  button to turn the set OFF.
4. Press  ENTER  and   `/1  buttons simultaneously, and the

display of fluorescent indicator tube changes to “AM 9 k ST”
or “AM 10 k ST”, and thus the channel step is changed over.

[GC Test  Mode]
• This mode is used to check the software version, FL tube, LED,

keyboard and VACS.

Procedure:
1. Press three buttons   x  ,  DISPLAY , and  DISC 2

simultaneously.

2. LEDs and fluorescent indicator tube are all turned on.
3. When you want to enter the software version display mode,

press  DISC 1 .The model number and destination are displayed.

4. Each time  DISC 1  is pressed, the display changes stating from

MC version, GC version, CD version, CDD, CDM version BD,
ST version, TA version, TM version, TC version, in this order,
and returns to the model number and destination display.

5. When  DISC 3  is pressed while the version numbers are being

displayed except model number and destination, year, month
and day of the software creation appear. When  DISC 3  is pressed
again, the display returns to the software version display. When
DISC 1  is pressed while year, month and day of the software
creation are being displayed, the year, month and day of creation
of the software versions are displayed in the same order of
version display.

6. Press  DISC 2  button, and the key check mode is activated.
7. In the key check mode, the fluorescent indicator tube displays

“KOJOVO”. Each time a button is pressed, “KEY” value
increases.
However, once a button is pressed, _it is no longer taken into
account.
“VOL” value increases like 1, 2, 3...if rotating VOLUME knob
in “+” direction, or it decreases like 0, 9, 8...if rotating in
“_”direction.

8. Also when  DISC 3  is pressed after lighting of all LEDs and FL

tubes, value of VACS appears.

9. To exit from this mode, press three buttons in the same manner

as step 1, or disconnect the power cord.

[MC Test  Mode]
• This mode is used to check operations of the respective sections

of Amplifier, Tuner, and Tape.

Procedure:
• To enter MC Test Mode
1. Press the  `/1  button to turn on the set.
2. Press the three buttons of  x   ,  DISPLAY  and  DISC 3

simultaneously.

3. Cursor segment flash on the FL display tube. The input

FUNCTION is changed to GAME.

* Check of Amplifier

Initial settings: Input

, GAME

EQ

, FLAT

Mode

, MUSIC

VA CS

, OFF

Output channel switching:

MUSIC key: L

,  L

R 

, R through

MOVIE key: L

, SL

R 

, SR through

GAME key:L

, L, SL, C R , R, SR, SW through

TOOL MODE key: L 

,  C

R 

, SW through

1. When the  VOLUME  control knob is turned clockwise even

slightly, the sound volume increases to is maximum and a
message “VOLUME MAX” appears for two seconds, then the
display returns to the original display.

2. When the  VOLUME  control knob is tuned counter-clockwise

even slightly, the sound volume decreases to its minimum and a
message “VOLUME MIN” appears for two seconds, then the
display returns to the original display.

* Tuner function
1. In the test mode, the default-preset channel is called even when

the TUNER is selected and an attempt is made to call the preset
channel that has been stored in memory. (It means that the
memory is cleared.)

2. The minimum, center and maximum frequency of each band is

set then.

* Tape recording test
1. To enter the MC Test Mode.
2. Load tapes in both tape decks A and B.
3. Press the REC button to start recording.
4. Pressing the  M  ,  m  buttons during recording returns the

tape to the recording start position and stops it at this position.

5. Pressing the “High Speed Dubbing” key while playing back the

tape of deck B switches the playback speed between “Normal
Speed” and “High Speed”.

Note:
When the playback direction of the tape is set to other than “ONY
WAY”, the restriction on the number of times playback which can
be repeated will be cleared.

* AMS Test Mode
1. Set TAPE function
2. Select the desired loop by pressing the  PLAY MODE  button.

Insert a test tape AMS-110A or AMS-120 to Deck A.

3. Press the  SPECTRUM  or  KARAOKE PON  button to enter

the AMS test mode.

4. After a tape is rewound first, the FF AMS is checked, and the

mechanism is shut off after detecting the AMS signal the AMS
signal twice.

5. Then the REW AMS is checked and the mechanism is shut off

after detecting the AMS signal twice.

6. When the check is complete, a message of either OK or NG

appears.

* To return to normal mode again.
1. When you want to exit this mode, press the  `/1  button.
2. The cold reset is enforced at the same time.

14

[CD Ship Mode (No Memory Clear)]
• This mode moves the position to the position durable to vibra-

tion Use this mode when returning the set to the customer after
repair.

Procedure:
1. Press  `/1  button to turn the set ON.
2. Press three  ENTER  ,  DISK 1  button and CD  button

simultaneously.

3. After the “STANBY” display blinks six times, a message

“LOCK” is displayed on the fluorescent indicator rube, and the
CD ship mode is set.

[CD Ship Mode (Memory Clear)]
• This mode moves the pickup to the position durable to vibra-

tion. Use this mode when returning the set to the customer after
repair.

Procedure:
1. Press  `/1  button to turn the set ON.
2. Press three buttons  CD  and  `/1  button simultaneously.
3. After the “STANDBY” display blinks six times, a message

“LOCK” is displayed on the fluorescent indicator tube, and the
CD ship mode is set.

[CD Service Mode]
• This mode can run the CD sled motor freely. Use this mode, for

instance, when cleaning the pickup.

Procedure:
1. Press  `/1  button to turn the set ON.
2. Select the function “CD”.
3. Press three buttons  ENTER  ,  DISC 1  , and  x   simultaneously.
4. The CD service mode is selected.
5. With the CD in stop status, press  M  button to move the

pickup to outside track, or press  m  button to inside track.

6. To exit from this mode, perform as follows:

1) Move the pickup to the most inside track.
2) Press  `/1  button to turn the set OFF.

Note:
• Always move the pickup to most inside track when exiting from

this mode. Otherwise, a disc will not be unloaded.

• Do not run the sled motor excessively, otherwise the gear can

be chipped.

15

[VCD COLOR SYSTEM MODE]
• This mode is used for changing the COLOR SYSTEM of the

VCD.

Procedure:
1. Set the standby mode.
2-1.Press the two buttons  `/1 and  >  simultaneously to set the

COLOR SYSTEM of the VCD to AUTO.

2-2.Press the two buttons  `/1 and  . simultaneously to fix the

COLOR SYSTEM of the VCD to PAL.

2-3.Press the two buttons  `/1 and  X  simultaneously to fix the

COLOR SYSTEM of the VCD to NTSC.

3. The power tune ON automatically and the function sets to“CD’’.
4. The FL tube shows the COLOR SYSTEM mode see .
5. The COLOR SYSTEM mode set is maintained (memorized)

until COLD RESET is executed.

[VIDEO CD Color-bars Mode]
On this mode, the data of the color-bars signal as a picture signal
and the 1 kHz sine wave signal as a sound signal are output by the
mechanism controller (IC502) for the video CD signal check.  When
measurement of the voltage and waveform on the VIDEO board,
perform it in this mode.
For reference, the color-bars signal can be observed at J302  using
an oscilloscope.
Procedure:
1. Short the both ends of the land of SL503 of the VIDEO board.
2. Turn the power on. Press the  CD  button to select CD.
3. The color-bars appears when the CD is in stop status, and it

disappears when the CD goes in play status.

4. After measuring, remove the lead wire connected.VIDEO board

(SIDE B)

[CD Servo ON/OFF Mode]
Procedure:
1.

Short SL502 on the VIDEO board by soldering.

2.

Turn on the main power.  Set a disc on the DISC1 tray.  Select
CD.

3.

Press the hH button to play back CD.

4.

When the  >  button is pressed, 100 track jump is executed.

5.

Also, every pressing of the PLAY MODE button triggers
between  ON and OFF of TRACKING SERVO and SLED
SERVO.

How to quit the CD servo ON/OFF mode:
1.

Press the  ?/1  button to turn off the main power.

2.

Remove soldering from SL502.

[REPEAT 5 LIMIT OFF MODE]
• This mode is used to enable infinite repetitions.

Normally, the number of repetitions allowed is 5.

Procedure:
1. Press the  `/1  button to turn ON the power supply.
2. Set the function “CD”.
3. Press the three burtons  ENTER ,  DISC 3 , and  x    is

simultaneously.

4. Infinite repetitions is enabled.
5. This state is maintained ( memorized ) until COLD RESET is

executed.

J301

CN501

J302

1  2  3

CN503

SL503

SL502

SL501

CHECK LED

CN502

16

0 dB=0.775 V

1. Demagnetize the record/playback head with a head

demagnetizer.

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

parts adjust.

4. The adjustments should be performed with the rated power

supply 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
adjustment.)

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.

• Test Tape

P-4-A100

10 kHz, –10 dB

Azimuth Adjustment

WS-48B

3 kHz, 0 dB

Tape Speed Adjustment

P-4-L300

315 Hz, 0 dB

Level Adjustment

Note:  Perform this adjustments for both decks

Procedure:
1. Mode:  Playback

Precaution
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

demagnetizer.

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

supply voltage unless otherwise noted.

main board
CN301
Pin 3 (L-CH)
Pin 1 (R-CH)

main board
CN301
Pin 2 (GND)

3.06 N • m to 6.96 N • m

31 to 71 g • cm

(0.43 – 0.98 oz • inch)

0.19 N • m to 0.58 N • m

2 to 6 g • cm

(0.02 – 0.08 oz • inch)

3.06 N • m to 6.96 N • m

31 to 71 g • cm

(0.43 – 0.98 oz • inch)

0.19 N • m to 0.58 N • m

2 to 6 g • cm

(0.02 – 0.08 oz • inch)

6.96 N • m to 14.02 N • m

71 to 143 g • cm

(0.98 – 1.99 oz • inch)

9.80 N • m

100 g or more

(3.53 oz or more)

9.80 N • m

100 g or more

(3.53 oz or more)

CQ-102C

CQ-102C

CQ-102RC

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

FWD

FWD
back tension

REV

REV
back tension

FF/REW

FWD tension

REV tension