Sony HCD-VX33 Service Manual

HCD-VX33

SERVICE MANUAL

• HCD-VX33 is the tuner, deck, CD and amplifier section in MHCVX33.

CD CD Mechanism Type CDM58-K2BD37A Section Base Unit Name BU-K2BD37A

Tape deck Model Name Using Similar Mechanism NEW Section T ape Transport Mechanism T ype TCM-230AWR11

E Model

Tourist Model

Model Name Using Similar Mechanism NEW

Optical Pick-up Name KSM-213DAP

SPECIFICATIONS

Amplifier section

MHC-VX33:

The following measured at AC 120, 220, 240 V 50/60 Hz DIN power output (rated) 75 + 75 watts

Continuous RMS power output (reference)

Inputs MD/VIDEO IN: voltage 450/250 mV, (phono jacks) impedance 47 kilohms MIC: sensitivity 1 mV, (mini jack) impedance 10 kilohms

Outputs VIDEO OUT: max. output level (phono jack) 1Vp-p, unbalanced,Sync

S-VIDEO OUT: Y: 1Vp-p, unbalanced, (4-pin/mini-DIN jack) Sync negative,

PHONES: accepts headphones of (stereo mini jack) 8 ohms or more SPEAKER: MHC-VX33: accepts impedance of 6 to

(6 ohms at 1 kHz, DIN)

100 + 100 watts (6 ohms at 1 kHz, 10% THD)

negative, load impedance 75 ohms

C: 0.286Vp-p, load impedance 75 ohms

16 ohms

VIDEO CD/CD player section

System Compact disc and digital

Laser Semiconductor laser

Laser output Max. 44.6

Wavelength 780 — 790 nm Frequency response 2 Hz — 20 kHz (±0.5 dB) Signal-to-noise ratio More than 90 dB Dynamic range More than 90 dB Video color system format

CD OPTICAL DIGITAL OUT (Square optical connector jack, rear panel) Wavelength 660 nm Output Level

audio system (λ=780 nm)

Emission duration: continuous

*This output is the value measured at a distance of 200 mm from the objective lens surface on the Optical Pick-up Block with 7 mm aperture.

NTSC, PAL

—18 dBm

— Continued on next page —

MINI Hi-Fi COMPONENT SYSTEM

Tape player section

Recording system 4-track 2-channel stereo Frequency response 40 — 13,000 Hz (±3 dB),

using Sony TYPE I cassette

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range Tourist model: 76.0 — 108.0 MHz Other models: 87.5 — 108.0 MHz Antenna FM lead antenna Antenna terminals 75 ohm unbalanced Intermediate frequency 10.7 MHz

AM tuner section

Tuning range Middle Eastern model: 531 — 1,602 kHz

Other models: 531 — 1,602 kHz

Antenna AM loop antenna Antenna terminals External antenna terminal Intermediate frequency 450 kHz

(with the interval set at 9 kHz)

(with the interval set at 9 kHz) 530 — 1,710 kHz (with the interval set at 10 kHz)

General

Power requirements Thai model: 220 V AC, 50/60 Hz Other models: 120 V, 220 V or

Power consumption 190 watts

Dimensions (w/h/d)

Mass Approx. 8.9 kg

Supplied accessories: AM loop antenna (1)

230 — 240 V AC, 50/60 H Adjustable with voltage selector

Approx. 280 x 325 x 403 mm

FM lead antenna (1) Remote Commander (1) Batteries (2) Video cable (1) Front speaker pads (8)

Design and specifications are subject to change without notice.

SAFETY CHECK-OUT

After correcting the original service problem, perform the following safety checks before releasing the set to the customer.

1. Check the area of your repair for unsoldered or poorly-soldered connections. Check the entire board surface for solder splashes and bridges.

2. Check the interboard wiring to ensure that no wires are "pinched" or contact high-wattage resistors.

3. Look for unauthorized replacement parts, particularly transistors, that were installed during a previous repair . Point them out to the customer and recommend their replacement.

4. Look for parts which, through functioning, show obvious signs of deterioration. Point them out to the customer and recommend their replacement.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY .

5. Check the B+ voltage to see it is at the values specified.

6. Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270˚C during repairing.

• Do not touch the soldering iron on the same conductor of the circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering or unsoldering.

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts. The flexible board is easily damaged and should be handled with care.

NOTES ON LASER DIODE EMISSION CHECK

The laser beam on this model is concentrated so as to be focused on the disc reflective surface by the objective lens in the optical pickup block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.

Laser component in this product is capable of emitting radiation exceeding the limit for Class 1.

This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT MARKING is located on the rear exterior.

CAUTION

Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

1. SERVICE NOTE······························································· 4

2. GENERAL ·········································································· 5

3. DISASSEMBY ·································································· 7

4. TEST MODE ····································································12

5. MECHANICAL ADJUSTMENTS ····························· 16

6. ELECTRICAL ADJUSTMENTS ······························· 16

7. DIAGRAMS

7-1. Circuit Board Location ················································· 23 7-2. Block Diagrams ···························································· 25 7-3. Printed Wiring Board BD Section ····························· 28 7-4. Schematic Diagram BD Section ································ 29 7-5. Printed Wiring Board Main Section ·························· 30 7-6. Schematic Diagram Main Section (1/3) ····················31 7-7. Schematic Diagram Main Section (2/3) ····················32 7-8. Schematic Diagram Main Section (3/3) ····················33 7-9. Printed Wiring Board Power AMP Section ··············· 34 7-10. Schematic Diagram Power AMP Section ················ 35 7-11. Printed Wiring Board Panel Section ························ 36 7-12. Schematic Diagram Panel Section ··························· 37 7-13. Printed Wiring Board Leaf SW Section ··················· 38 7-14. Schematic Diagram Leaf SW Section ····················· 39 7-15. Printed Wiring Board Driver Section······················· 40 7-16. Schematic Diagram Driver Section ························· 41 7-17. Printed Wiring Board Video CD Section ················· 42 7-18. Schematic Diagram Video CD Section (1/2) ··········· 43

7-19. Schematic Diagram Video CD Section (2/2) ··········· 44 7-20. Printed Wiring Board Power Section ······················· 45 7-21. Schematic Diagram Power Section··························45 7-22. IC Pin Function Description ······································· 46 7-23. IC Block Diagrams ····················································· 50

8. EXPLODED VIEWS

8-1. Main Section ································································· 54 8-2. Panel Section ································································55 8-3. Main Board Section ······················································ 56 8-4. Tape Mechanism Section (TCM-230PWR11) (1/2)·····57 8-5. Tape Mechanism Section (TCM-230PWR11) (2/2)·····58 8-6. CD Mechanism Section (CDM58-K2BD37) ··············· 59

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be

damaged by heat.

Flexible Circuit Board Repairing

• Keep the temperature of soldering iron around 270˚C during repairing.

• Do not touch the soldering iron on the same conductor of the circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering or unsoldering.

9. ELECTRICAL PARTS LIST ·······································60

MODEL IDENTIFICATION

— BACK PANEL —

PARTS No.

SECTION 1

SERVICE NOTE

Panel board

MODEL

E, EA, HK, MY, SP, TW, JE models TH model IA model

• Abbreviation EA :Saudi Arabia model MY :Malaysia model SP :Singapore model TH :Thai model TW :Taiwan model IA :Indonesia model HK :Hong Kong model JE :Tourist model

PARTS No.

4-224-547-3s 4-224-547-5s 4-226-245-4s

Cut the fourteen melted-connection points with a cutting plier.

Note for installing the panel board

Screw hole

Attach the panel board with fourteen screws ( after the board is removed once. Do not tighten the screws excessively.

+BVTP 2.6 × 8

Hot melt

)

123 45

SECTION 2

GENERAL

w; ql

qk qj

qsqdqfqgqh

1 – . button 2 x button 3 gG/SELECT button 4 S button 5 > + button 6 PLAY MODE button 7 REPEA T button 8 EDIT button 9 VOLUME knob q; PHONE jack qa OPEN/CLOSE button qs DISC 3 button qd DISC 2 button qf DISC 1 button qg DISC SKIP EX-CHANGE button qh CURSOL button qj MIC jack qk ECHO LEVEL knob ql MIC LEVEL knob w; SPECTRUM button wa DISPLAY button ws @/1 button

8 9

wj wh

wg wf wd

wd MD/VIDEO button and indicator wf TAPE A/B button and indicator wg RETURN button wh PREV button wj NEXT button wk CD button and indicator wl TUNER/BAND button and indicator e; GROOVE button and indicator ea CINEMA SPACE button and indicator es CD SYNC HI-DUB button ed REC PAUSE/START button and indicator ef KARAOKE PON/MPX button eg ENTER button eh EQ EDIT button ej PICTURE EFFECT button

efeg

This section is extracted from instruction manual.

Step 2: Setting the time

You must set the time before using the timer functions.

2,4

Press CLOCK/TIMER SET.

The hour indication flashes.

NX x

xMm>.

1 3,5

Press . or > repeatedly to set the hour.

Press ENTER.

The minute indication flashes.

Press . or > repeatedly to set the minute.

Press ENTER.

The clock starts working.

Tip

If you make a mistake, start over from step 1.

To change the time

The previous explanation shows how to set the time while the power is off. To change the time while the power is on, do the following:

1 Press CLOCK/TIMER SET. 2 Press . or > repeatedly to select SET

CLOCK.

3 Press ENTER. 4 Perform steps 2 through 5 above.

Note

The clock settings are canceled when you disconnect the power cord or if a power failure occurs.

SECTION 3

DISASSEMBY

Note : Follow the disassembly procedure in the numerical order given.

3-1. UPPER CASE (TOP)

Upper case (Top)

Two screws (Case)

Two screws

(+BVTP 3

10)

Four screws (+BVTP 3

10)

Case (L)

Screw (Case)

3-2. LOADING PANEL ASSY

CD mechanism deck (CDM58) 1

Turn the pulley to the direction of arrow.

pulley

Front panel side

Loading panel assy

Screw (Case)

Case (R)

Two screw

Two screws (Case)

Pull-out the disc tray.

3-3. FRONT PANEL SECTION

CD mechanism deck (CDM58)

Screw (+BVTP 3

Flat type wire

(CN502)

Video Board

10)

qs Two

screws

(+BVTP 2.6

Flat type wire

(CN501)

Flat type wire(CN304)

q; Two

screws

(+BVTP 3

10)

Three screws (+BVTT 3

3-4. TAPE MECHANISM DECK

Screw(+BVTP 3

Connector (CN1)

Connector (CN2)

Front panel section

Bracket (Heart cam L)

Screw (+BVTP 2.6

Five screws (+BVTP 2.6

10)

Screw (+BVTP 2.6

Bracket (Heart cam R)

Tape mechanism deck

3-5. PANEL BOARD

)

Ring (Vol)

Knob (Volume)

Hexagon nut

Spring (Jog)

Bracket (Volume)

Six claws

Panel board

Cut the fourteen melted-connection points with a cutting plier.

3-6. SUB-TRANS BOARD AND TRANS BOARD

Connector (CN971)

Two screws

(+BVTT 4

Connector (CN972)

Two screws

(+BVTT 4

Trans board

Note: When attching the panel board, refer to "Service Note" on page 4.

Back panel

Two screws

(+BVTP 3

Cover (Duct)

Sensor board

(+BVTP 3

10)

Five screws

(+BVTP 3

Two screws

10)

Trans

Screw (+BVTP 2.6

3-7. MAIN BOARD AND AMP BOARD

)

Three screws (+BVTP 3

Power

AMP board

Two screws (+BVTP 3

16)

Heat sink

Two screws (+BVTP 3

Main board

3-8. LEAF SW BOARD, HEAD (A) BOARD AND HEAD (B) BOARD

Five claws

Two screws (+BVTP 3

2 Leaf

SW board

Remove the four solderings.

Head (A) board

Screw (+PS 2.6

Head (B) board

Screw (+PS 2.6

)

3-9. BASE UNIT

Two insulators

Base unit

BD board

Two insulators

Four screws (+PTPWH 2.6

Flat type wire (CN102)

Flat type wire (CN101)

Screw (+BVTT 2.6

3-10. DRIVER BOARD, MOTOR BOARD AND ADDRESS SENSOR BOARD

Tray

Connector (CN701)

Screw (+PTPWH 2.6

Screw (+BVTP 2.6

Driver board

Motor board

Three screws (+BVTP 2.6

Flat type wire (CN721)

Remove the two solderings of motor.

Address sensor board

Screw (+BVTP 2.6

Pull-out the disc tray.

SECTION 4

TEST MODE

[MC 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 , ENTER , and ?/1 simultaneously.

2. The fluorescent indicator tube displays “COLD RESET” and

the set is reset.

[CD Ship Mode]

• 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 x , ENTER , and SPECTRUM

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.

[MC Hot Reset]

• This mode resets the set with the preset data kept stored in the

memory. The hot reset mode functions same as if the power cord is plugged in and out.

Procedure:

1. Press three buttons x , ENTER , and DISPLAY

simultaneously.

2. The fluorescent indicator tube becomes blank instantaneously,

and the set is reset.

[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 x , ENTER , and Z OPEN/CLOSE si-

multaneously.

4. The CD service mode is selected.

5. With the CD in stop status, turn the shuttle knob clockwise to

move the pickup to outside track, or turn the shuttle knob counter-clockwise to inside track.

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

1) Move the pickup to the most inside track.

2) Press three buttons in the same manner as step 2.

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.

[Change-over of AM Tuner Step between 9 kHz and 10 kHz]

• A step of MW 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 STEP” or “AM 10 k STEP”, 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 , ENTER , 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 starting

from MC version, GC version, VC version, CD version, CM version, ST version, TC version, TA version, TM version and BR 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

“KEY0 VOL0”. 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 e xit from this mode, press three b uttons in the same manner

as step 1, or disconnect the power cord.

[VACS ON/OFF Mode]

• This mode is used to switch ON and OFF the VACS (Variable Attenuation Control System).

Procedure:

Press the ENTER and SPECTRUM buttons simultaneously. The message “VACS OFF” or “VACS ON” appears.

[MC Test Mode]

• This mode is used to check operations of the respective sections of Amplifier, Tuner, CD and Tape.

Procedure:

1. Press the three buttons of x , ENTER and DISC 3 simultaneously.

2. A message “TEST MODE” appears on the FL display tube.

3. When f (CURSOR UP) button is pressed, GEQ increases to its maximum and a message “GEQ AMX” appears.

4. When F (CURSOR DOWN) button is pressed, GEQ decreases to its minimum and a message “GEQ MIN” appears.

5. When g (CURSOR LEFT) or G (CURSOR RIGHT) button is pressed, GEQ is set to flat and a message “GEQ FLAT” appears.

6. When the VOLUME control knob is turned clockwise even slightly, the sound volume increases to its maximum and a message “V OLUME MAX” appears for two seconds, then the display returns to the original display.

7. When the VOLUME control knob is turned 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.

8. In the test mode, the default-preset channel is called even w hen the TUNER is selected and an attempt is made to call the preset channel that has been stored in memory, by oper ating the Shuttle knob. (It means that the memory is cleared.)

9. When CD is selected and the EDIT button is pressed, the disc that is being chucked at this moment becomes the default setting. It means that the default disc only is accessed when any other discs are selected even though the display indication changes accordingly. At the same time, the DISK SKIP EXCHANGE and OPEN/CLOSE cannot be accepted. (It means that the tray motor and the turntable motor are disabled of their operation.)

10. When a tape is inserted in Deck B and recording is started, the input source function selects VIDEO automatically.

11. When x button is pressed to stop recording, the Tape (Deck) B is selected and tape is rewound using the Shuttle knob, tape is rewound, tape is stops at around the record-starting position and playback of the recorded portion of the tape is started. If P A USE is inserted even once during recording, ta pe is rewound to the position around the P AUSE position and is played back.

12. When the CD SYNC HI-DUB Button is press during playback of Deck B, either normal speed or high speed can be selected by this button.

13. Select the desired loop by pressing the PLAY MODE b utton. Insert a test tape AMS-110A or AMS-RO to Deck A.

14. Press the SPECTRUM button to enter the AMS test mode.

15. After a tape is rewound first, the FF AMS is checked, and the mechanism is shut off after detecting the AMS signal twice.

16. Then the REW AMS is checked and the mechanism is shut off after detecting the AMS signal twice.

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

18. When you want to exit this mode, press the ?/1 button twice. The cold reset is enforced at the same time.

[Tape Aging Mode]

This mode can be used for operation check of tape deck section. Tape deck section work in parallel.

• If an error occurred: The aging operation stops and displays then status.

• If no error occurs: The aging operation continues repeatedly.

Procedure:

1. Load the tapes into the decks A and B respectively.

2. Press the CD button to select the function “CD”.

3. Press the PLAY MODE button to set the ALL DISCS mode,

and press the REPEAT button to “REPEAT” off.

4. Press three buttons of p , ENTER , and DISC SKIP/EX-

CHANGE simultaneously.

5. The aging mode is activated.

6. To exit from the aging mode, press the 1/u button to turn the

power OFF and operate the cold reset. (Refer to the “MC Cold Reset”)

1. Display at the Aging Mode

• Display operating state of tape deck section alternately.

• If an error occurred, stop display.

2. Tape Deck Section

• The sequence during the aging mode is following as below.

• If an error occurred, stop display that step.

Aging mode sequence (Tape deck section) :

Rewind the tape A and B

“TAPE A AG-1”

Shut off

FWD play the tape A

“TAPE A AG-2”

2 minutes

Fast forward the tape A

“TAPE A AG-3”

Shut off or 20 seconds

REV play the tape A

“TAPE A AG-4”

2 minutes

Rewind the tape A

“TAPE A AG-5”

Shut off

FWD play the tape B

“TAPE B AG-2”

2 minutes

Fast forward the tape B

“TAPE B AG-3”

Shut off or 20 seconds

REV play the tape B

“TAPE B AG-4”

2 minutes

Rewind the tape B

“TAPE B AG-5”

Shut off

Note: “TAPE * AG-*” is display of each step.

[CD Aging Mode]

Procedure:

1. Short SL501 by soldering.

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

3. Press the SELECT/gG button. The aging mode starts.

4. Aging status appears on the monitor screen.

TOC reading

Last track is played bac

First track is played bac

OPEN

Monitor Display

1st line OPEN/CLOSE/CD PLAY display 2nd line DISC1/DISC1-15/DISC1-1/TIME display 4th line COUNT : 1 display 5th line TOTAL ERR : 00 display 6th line JITTER FF display 3rd line AGING

[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.

VIDEO board (SIDE A)

How to exit the CD aging mode:

1. Press the ?/1 and turn off the main power.

2. Remove soldering from SL501.

[Function Change Mode]

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

Procedure:

1. Turn on the power.

2. Press the two buttons ENTER 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”.

[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 (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)

CN501

J301

SL503

SL502

SL501

CHECK LED

J302

CN503

CN502

SECTION 5

MECHANICAL ADJUSTMENTS

SECTION 6

ELECTRICAL ADJUSTMENTS

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.

Torque Measurement

Mode

FWD

FWD back tension

REV

REV back tension

FF/REW

FWD tension

REV tension

Torque meter

CQ-102C

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

Meter reading

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)

DECK SECTION

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 RCH.

7. Switches and controls should be set as follows unless otherwise specified.

• Test Tape

Tape Signal Used for

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

Record/Playback Head Azimuth Adjustment

0 dB=0.775 V

DECK A DECK B

Note: Perform this adjustments for both decks

Procedure:

1. Mode: Playback

test tape P-4-A100 (10 kHz, –10 dB)

set

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

MAIN board CN301 Pin 2 (GND)

level mete

+ –

2. Turn the adjustment screw and check output peaks. If the peaks

–

set

test tape P-4-L300 (315 Hz, 0 dB)

MAIN board CN301 (Pin 3 : L-CH)

(Pin 1 : R-CH)

level meter

do not match for L-CH and R-CH, turn the adjustment screw so that outputs match within 1dB of peak.

Output level

within 1dB

L-CH peak

R-CH peak

within 1dB

Screw position

L-CH peak

Screw position

R-CH peak

Tape Speed Adjustment

Note: Start the Tape Speed adjustment as below after setting to the test

mode. In the test mode, the tape speed is high during pressing the

DECK B

CD SYNC HI-DUB button.

Procedure:

1. Turn the power switch on.

2. Press the x button, ENTER button and DISC 3 button simultaneously. (The “TEST MODE” on the fluorescent indicator tube display while in the test mode.) To exit from the test mode, press the ?/1 button.

Mode: Playback

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

frequency counte

3. Mode: Playback

test tape P-4-A100 (10 kHz, –10 dB)

L-CH

MAIN board CN301 set

R-CH

waveform of oscilloscope

in phase 45° 90° 135° 180°

pin 3

pin 2

pin 1

good

oscilloscop

wrong

4. After the adjustments, apply suitable locking compound to the pats adjusted.

Adjustment Location: Playback Head (Deck A).

Record/Playback/Erase Head (Deck B).

set

MAIN board CN301 (Pin 3 : L-CH)

(Pin 1 : R-CH)

–

1. Insert the WS-48B into the deck B.

2. Press the gG button on the deck B.

3. Press the CD SYNC HI-DUB button in playback mode. Then at HIGH speed mode.

4. Adjust RV1001 on the LEAF SW board do that frequency counter reads 6,000 ± 30 Hz.

5. Press the CD SYNC HI-DUB button. Then back to NORMAL speed mode.

6. Adjust RV1002 on the LEAF SW board so that frequency counter reads 3,000 ± 15 Hz.

Adjustment Location: LEAF SW board

Playback level Adjustment

DECK A DECK B

Procedure:

Mode: Playback

forward

reverse

Deck A is RV302 (L-CH) and RV352 (R-CH), Deck B is RV303 (L-CH) and RV353 (R-CH) so that adjustment within adjustment level as follows.

Adjustment Level:

CN301 PB level: 301.5 to 338.3 mV (–8.2 to –7.2 dB) level difference between the channels: within ±0.5 dB

Adjustment Location: MAIN board

Sample Volue of Wow and Flutter: 0.3% or less W. RMS

(WS-48B)

REC Bias Adjustment DECK B

)

Procedure:

INTRODUCTION When set to the test mode performed in Tape Speed Adjustment, when the tape is rewound after recording, the “REC memory mode” which rewinds only the recorded portion and playback is set. This “REC memory mode” is convenient for performing this adjustment. During recording, the input signal FUNCTION will automatically switch to VIDEO. (If do not operation of stopped from recording complete, and rotette of shuttle knob then rewind to recording start position.)

4. Mode: Record

MD/VIDEO (AUDIO) IN

AF OSC

315 Hz, 50 mV (–23.8 dB)

attenuator

5. Mode: Playback

600 Ω

blank tape CS-123

set

1. Press MD(VIDEO) button to select MD. (This step is not necessary if the above test mode has already been set.)

2. Insert a tape into deck B.

3. After press REC P AUSE/STAR T b utton, press REC PAUSE/ START button, then recording start.

4. Mode: Record

MD/VIDEO (AUDIO) IN

1) 315 Hz

2) 10 kHz

AF OSC

attenuator



50 mV (–23.8 dB)

 

600 Ω

blank tap CN-123

set

5. Mode: Playback

recorded portion

set

MAIN board CN301C(Pin 3 : L-CH)

(Pin 1 : R-CH

level meter

–

recorded portion

set

level meter

–

MAIN board CN301C(Pin 3 : L-CH)

(Pin 1 : R-CH

6. Confirm playback the signal recorded in step 3 become adjustable level as follows. If these levels do not adjustable level, adjustment the RV301 (L-CH) and R V351 (R-CH) on the MAIN board to repeat steps 4 and 5.

Adjustable level:

CN301 PB level: 47.2 to 53.0 mV (–24.3 to –23.3 dB) Adjustment Location: MAIN board

[MAIN BOARD] (Component Side)

T601

RV611

REC LEVEL (L)

(B)

PB LEVEL (R)

(A)

6. Confirm playback the signal recorded in step 3 become adjustable level as follows. If these levels do not adjustable level, adjustment the RV304 (L-CH) and R V354 (R-CH) on the MAIN board to repeat steps 4 and 5.

Adjustable level: Playback output of 315 Hz to playback output

of 10 kHz: ±1.0 dB

Adjustment Location: MAIN board

REC Level Adjustment

DECK B

Procedure:

INTRODUCTION When set to the test mode performed in Tape Speed Adjustment, when the tape is rewound after recording, the “REC memory mode” which rewinds only the recorded portion and playback is set. This “REC memory mode” is convenient for performing this adjustment. During recording, the input signal FUNCTION will automatically switch to VIDEO. (If do not operation of stopped from recording complete, and rotate of shuttle knob then rewind to recording start position.)

1. Press MD(VIDEO) button to select MD. (This step is not necessary if the above test mode has already been set.)

2. Insert a tape into deck B.

3. After press REC P AUSE/STAR T b utton, press REC PAUSE/ START button, then recording start.

PB LEVEL (L)

(A)

PB LEVEL (R)

(B)

REC LEVEL (R)

(B)

BIAS LEVEL (L)

[LEAF SW BOARD] (Component Side)

TAPE SPEED

(NORMAL) (HIGH)

RV1002

RV1001

CN301

RV351

BIAS LEVEL (R)

RV301

RV352

RV302

RV353

RV303

PB LEVEL (L)

(B)

CN1001

CN304

CN302

RV304

RV354

FM Tuned Level Adjustment

FM RF SSG

75 Ω coaxial

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

set

FM ANTENNA terminal (TM601)

CD SECTION

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 indica ted.

3. Use an oscilloscope with more than 10MΩ 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.

S-Curve Check

Procedure:

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

2. Tune the set to 98 MHz.

3. Adjust RV611 to the point (moment) when the TUNED indicator will change from going off to going on.

Adjustment Location: MAIN board

Null Adjustment

FM RF SSG

75 Ω coaxial

set

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

FM ANTENNA terminal (TM601)

Procedure:

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

2. Tune the set to 98 MHz.

3. Measure voltage between pin 21 of IC 601. Adjust T601 ubtil the voltage becomes 0 V.

Oscilloscope

BD board

TP(FEO) TP(VC)

Procedure :

1. Connect oscilloscope to TP (FEO).

2. Connect between TP (FEI) and TP (VC) by lead wire.

3. Connect between TP (AGCCONT) and TP (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 lev el within 4 ±1 Vp-p.

S-curve waveform

symmetry

within 4 ±1Vp-p

Adjustment Location: MAIN board

Adjustment Location

[MAIN BOARD] Component side

NULL

T601

RV611

FM TUNED LEVEL

CN301

RV351

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.

RF Level Check

oscilloscope

BD board

TP(RF) TP(VC)

Procedure :

CN304

RV301

RV303

RV352

RV302

RV353

CN302

1. Connect oscilloscope to TP (RF).

2. Connect between TP (AGCCONT) and TP (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.

RV304

RV354

Note : Clear RF signal waveform means that the shape “ ◊ ” can be clearly

)

distinguished at the center of the waveform.

RF signal waveform

VOLT/DIV : 200mV TIME/DIV : 500ns

level : 1.45 ± 0.3Vp-p

E-F Balance (1 Track jump) Check

oscilloscop

BD board

Adjustment Location:

[BD BOARD] (Conductor Side)

TP (RF)

TP (VC)

TP(TEO) TP(VC)

Procedure :

1. Connect oscilloscope to TP (TEO) and TP (VC).

2. Turned Power switch on.

3. Load a disc (YEDS-18) and playback the number five track.

4. Press the X button. (Becomes the 1 track jump mode.)

5. Confirm that the level B and A (DC voltage) on the oscilloscope waveform.

1 track jump waveform

level=1.3 ± 0.6Vp-p

Specified level: –– × 100=less than ±22%

A B

symmetry

center of waveform

A (DC voltage

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

TP (FE0)

IC103

TP (TEO)

IC101

VIDEO SECTION

Frequency Adjustment

Connection:

VIDEO board

(27 MHz)

frequency counte

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.

Adjustment Location:

[VIDEO BOARD] (Component Side)

J301

J302

IC507

CN501

SL503

SL502

SL501

CHECK LED

CN502

(27MHz)

(GND)

CT503 VIDEO Frequency Adjustment

CN503

HCD-VX33

SECTION 7

DIAGRAMS

THIS NOTE IS COMMON FOR PRINTED WIRING BO ARDS AND SCHEMATIC DIAGRAMS. (In addition to this, the necessary note is printed in each bloc k.)

Note on Schematic Diagram:

• All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums.

• All resistors are in Ω and 1/ specified.

•

• C : panel designation.

• U : B+ Line.

• V : B– Line.

• H : adjustment for repair.

• Voltages and waveforms are dc with respect to ground

• Voltages are tak en with a VOM (Input impedance 10 MΩ).

• Waveforms are taken with a oscilloscope.

• Circled numbers refer to waveforms.

• Signal path.

• Abbreviation

: internal component.

The components identified by mark 0 or dotted line with mark 0 are critical for safety. Replace only with part number specified.

under no-signal (detuned) conditions. Voltage variations may be noted due to normal produc-

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

tion tolerances.

F : FM f : AM E : PB (DECK A) d : PB (DECK B) G : REC (DECK B) J : CD c : digital out

EA : Saudi Arabia model MY : Malaysia model SP : Singapore model TH : Thai model TW : Taiwan model IA : Indonesia model HK : Hong Kong model JE : Tourist model

W or less unless otherwise

Note on Printed Wiring Boards:

• X : parts extracted from the component side.

• b : Pattern from the side which enables seeing.

• Indication of transistor. C

These are omitted.

7-1. CIRCUIT BOARD LOCATION

HCD-VX33

ADDRESS SENSOR Board

TRANS Board

PANEL Board

LEAF SW Board

HEAD (A) Board

MOTOR Board

DRIVER Board

BD Board

VIDEO Boar

MAIN Board

AMP Board

HEAD (B) Board

+ 51 hidden pages

Sony HCD-VX33 Service Manual

TABLE OF CONTENTS

SERVICE NOTE

GENERAL

DISASSEMBY

TEST MODE

MECHANICAL ADJUSTMENTS

ELECTRICAL ADJUSTMENTS

DIAGRAMS