DOWNLOAD Sony MHC-VX333 (serv.man2) Service Manual ↓ Size: 12.12 MB | Pages: 70 in PDF or view online for FREE

16

2)  Operation during aging mode
In the aging mode, the program is executed in the following
sequence.
(1)

The disc tray opens and closes.

(2)

The mechanism accesses DISC 2 and makes an attempt to
read TOC.  However, since there are no discs, a message
“CD2 NO DISC” appears.

(3)

The mechanism accesses DISC 3 and a message “CD3 NO
DISC” appears.

(4)

The disc tray turns to select a disc1.

(5)

A disc is chucked.

(6)

TOC of disc is read.

(7)

The pickup accesses to the track 1, and  playing 2 seconds.

(8)

The pickup accesses to the last track, and playing 2 seconds.

(9)

Every time when an aging operation of step 1 to step 8 is
complete, the display “AGING[*][*][*][*]” value increases
as the number of aging operations is counted up.

(10) Returns to step 1.

3. Aging Mode in Tape Deck section
1) Display state
• No error occurs

Display action now

• Error occurred

Display action last time

2)  Operation during aging mode
In the aging mode, the program is executed in the following
sequence.
(1) Rewind is executed up to the top of tape A and B.
(2) A tape on FWD side is played for 2 minutes.
(3) FF is executed up to either made for 20 second or the end of

tape.

(4) A tape is reversed, and the tape on REV side is played for 2

minutes.
The tape on the REV side is played in both A and B.

(5) Rewind is executed up to the top of tape.
(6) Returns to step 2, and repeat steps from 2 to 5.

* Select either VIDEO or MD of the external FUNCTION input.

Procedure:
1.

Turn on the power.

2.

Press the two buttons  MD (VIDEO)  and  ?/1  at the same
time.
The main power is turned on and the other function of the
previous function is selected and displayed.  “MD” or
“VIDEO”.

NO. Display action

Action contents

Final timing

1

TAPE A AG-6

Rewind the TAPE A

The top of tape

TAPE B AG-1

Rewind the TAPE B

2

TAPE A AG-2

FWD play the TAPE A

2 minutes playing

3

TAPE A AG-3

F.F. the TAPE A

20 second FF or the end
of tape

4

TAPE A AG-4

REV play the TAPE A

2 minutes playing

5

TAPE A AG-5

Rewind the TAPE A

The top of tape

6

TAPE B AG-2

FWD play the TAPE B

2 minutes playing

7

TAPE B AG-3

F.F. the TAPE B

20 second FF or the end
of tape

8

TAPE B AG-4

REV play the TAPE B

2 minutes playing

9

TAPE B AG-5

Rewind the TAPE B

The top of tape

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 CN301
(VIDEO OUT) 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)

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.

17

Procedure:
1.

Supply a 98 MHz signal at 28 dB from the ANTENNA terminal.

2.

Tune the set to 98 MHz.

3.

Adjust RV101 to the point (moment) when the TUNED
indicator will change from going off to going on.

Adjustment Location: MAIN board

Procedure:
1.

Supply a 98 MHz signal at 60 dB from the ANTENNA terminal.

2.

Tune the set to 98 MHz.

3.

Measure voltage between pin 21 and pin 23 of IC 101.  Adjust
T101 ubtil the voltage becomes 0 V.

Adjustment Location: MAIN board

FM RF Signalgenerator

75 

Ω

 coaxial

Carrier frequency : 98 MHz
Modulation           : AUDIO 1 kHz, 75 kHz
                              deviation (100%)
Output level          : 28 dB  (at 75 

Ω

 open)

FM ANTENNA terminal
(TM101)

set

FM RF Signalgenerator

75 

Ω

 coaxial

Carrier frequency : 98 MHz
Modulation           : AUDIO 1 kHz, 75 kHz
                              deviation (100%)
Output level          : 60 dB  (at 75 

Ω

 open)

FM ANTENNA terminal
(TM101)

set

Note :

1. CD Block is basically designed to operate without adjustment.

Therefore, check each item in order given.

2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M

Ω impedance.

4. Clean the object lens by an applicator with neutral detergent

when the signal level is low than specified value with the
following checks.

Procedure :
1. Connect oscilloscope to TP (FE0).
2. Connect between TP (FEI) and TP (VC) by lead wire.
3. Connect between TP (AGCCON) and TP (D GND) by lead wire.
4. Turn Power switch on.
5. Load a disc (YEDS-18) and actuate the focus search. (In

consequence of open and close the disc tray, actuate the focus
search)

6. Confirm that the oscilloscope waveform (S-curve) is

symmetrical between A and B. And confirm peak to peak level
within 4 

±1 Vp-p.

7. After check, remove the lead wire connected in step 2 and 3.

Note :

• Try to measure several times to make sure than the ratio

of A : B or B : A is more than 10 : 7.

• Take sweep time as long as possible and light up the

brightness to obtain best waveform.

Procedure :
1. Connect oscilloscope to TP (RF).
2. Connect between TP (AGCCON) and TP (D GND) by lead wire.
3. Turned Power switch on.
4. Load a disc (YEDS-18) and playback.
5. Confirm that oscilloscope waveform is clear and check RF signal

level is correct or not.

6. After check, remove the lead wire connected in step 2.

±

T101

IC101

RV101

T101:NULL

RV101:FM TUNED LEVEL

18

Note : Clear RF signal waveform means that the shape “ 

◊ ” can be clearly

distinguished at the center of the waveform.

Procedure :
1. Connect oscilloscope to TP (TE0) and TP (VC).
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback the number five track.
4. Press the  gG  button. (Becomes the 1 track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscilloscope

waveform.

6. After check, remove the lead wire connected in step 1.

±

±

Specified level: –– 

× 100=less than ±22%

B

A

[BD BOARD] (Conductor Side)

Procedure:
1. Connect the frequency counter to check point of the VIDEO

board.

2. Turned power switch on.
3. Press the  CD  button to select the CD.
4. Adjust CT503 on the VIDEO board so that the frequency counter

reading 27.0 MHz 

± 80 Hz at stop status.

[VIDEO CD BOARD] (Component Side)

19

Note on Schematic Diagram:
• All capacitors are in 

µ

F unless otherwise noted.  p: pF. 50

WV or less are not indicated except for electrolytics and
tantalums.

• All resistors are in 

Ω

 and 

1

/

4

 

W or less unless otherwise

specified.

•

¢

: internal component.

•

C

: panel designation.

• X

: parts extracted from the component side.

• b

: Pattern from the side which enables seeing.

• Indication of transistor.

•

A

: B+ Line.

•

B

: B– Line.

•

H

: adjustment for repair.

• Voltages and waveforms are dc with respect to ground

under no-signal (detuned) conditions.

• Voltages are taken with a VOM (Input impedance 10 M

Ω

).

Voltage variations may be noted due to normal produc-
tion tolerances.
no mark : FM
(

) : CD

[

] : TAPE

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal produc-
tion tolerances.

• Circled numbers refer to waveforms.

• Signal path.

F

: FM

f

: AM

E

: PB (DECK A)

d

: PB (DECK B)

G

: REC (DECK B)

J

: CD

c

: digital out

C

B

These are omitted.

E

Q

B

These are omitted.

C

E

Q

• Abbreviation

MY

: Malaysia model.

SP

: Singapore model.

TH

: Thai model.

EA

: Saudi Arabia model.

JE

: Tourist model.

IA

: Indonesian model.

TW

: Taiwan model.

Note: The components identified by mark 

0

 or dotted line

with mark 

0

 are critical for safety.

Replace only with part number specified.

• Abbreviation

MY

: Malaysia model.

SP

: Singapore model.

TH

: Thai model.

EA

: Saudi Arabia model.

JE

: Tourist model.

IA

: Indonesian model.

TW

: Taiwan model.

TRANS board

MOTOR board

ADDRESS SENSOR board

DRIVER board

VIDEO CD board

SENSOR board

BD board

VIDEO OUT board

SUB TRANS board

MAIN board

POWER AMP board

PANEL board

KEY board

Caution:
Pattern face side:

Parts on the pattern face side seen from

(Side B)

the pattern face are indicated.

Parts face side:

Parts on the parts face side seen from

(Side A)

the parts face are indicated.