Sony HCD-DX8 Service manual

HCD-DX8

SERVICE MANUAL

Ver 1.1 2001.08

HCD-DX8 is the tuner, tape pla yer, CD pla yer and amplifier section in MHC-DX8.

This stereo system is equipped with the Dolby Btype noise reduction system*. * Manufactured under license from Dolby Laboratories Licensing Corporation. DOLBY and the double-D symbol ; are trademarks of Dolby Laboratories Licensing Corporation.

SECTION

TAPE DECK

SECTION

Model Name Using Similar Mechanism HCD-BX7 CD Mechanism Type CDM58-K2BD38 Base Unit Type BU-K2BD38 Optical Pick-up Type KSM-213DAP/Z-NP Model Name Using Similar Mechanism NEW T ape Transport Mechanism T ype TCM-230AWR11

E Model

Australian Model

SPECIFICATIONS

Amplifier section

The following measured at AC 120, 220, 240V 50/60 Hz DIN power output (rated) 160 + 160 watts

Continuous RMS power output (reference)

Inputs MD/VIDEO (AUDIO) IN: voltage 450 mV/250 mV, (phono jacks) impedance 47 kilohms MIC: sensitivity 1 mV, (phone jack) impedance 10 kilohms Outputs PHONES: accepts headphones of 8 (stereo mini jack) ohms or more FRONT SPEAKER: accepts impedance of 6 to

SATELLITE SPEAKER: accepts impedance of 6 to

(6 ohms at 1 kHz, DIN)

200 + 200 watts (6 ohms at 1 kHz, 10% THD)

16 ohms

CD player section

System Compact disc and digital

Laser Semiconductor laser

Laser output Max. 44.6

Frequency response 2 Hz – 20 kHz (±0.5 dB) Wavelength 780 – 790 nm Signal-to-noise ratio More than 90 dB Dynamic range More than 90 dB CD OPTICAL DIGITAL OUT (Square optical connector jack, rear panel) Wavelength 660 nm Output Level –18 dBm

audio system (λ=780nm)

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.

— Continued on next page —

9-929-221-12 Sony Corporation

2001H0500-1 Home Audio Company C 2001.8 Shinagawa Tec Service Manual Production Group

COMPACT DISC DECK RECEIVER

Tape player section

Recording system 4-track 2-channel stereo Frequency response 40 – 13,000 Hz (±3 dB), (DOLBY NR OFF) using Sony TYPE I

cassette 40 – 14,000 Hz (±3 dB), using Sony TYPE II cassette

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range 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 models: 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 Australian models: 230 - 240 V AC, 50/60 Hz Mexican models: 120 V AC, 60 Hz Other models: 120 V, 220 V or 230 - 240

Power consumption

Dimensions (w/h/d)

Mass :

V AC, 50/60 Hz Adjustable with voltage selector

250 watts

Approx. 280 x 360 x 425 mm

Approx. 9.5 kg

Design and specifications are subject to change without notice.

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.

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.

TABLE OF CONTENTS

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

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

3. DISASSEMBLY································································ 7

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

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

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

7. DIAGRAMS

7-1. Circuit Boards Location ··················································· 21 7-2. Block Diagrams ································································ 22 7-3. Printed Wiring Board – BD Section – ····························· 24 7-4. Schematic Diagram – BD Section –································25 7-5. Printed Wiring Board – MAIN Section – ························ 26 7-6. Schematic Diagram – MAIN (1/3) Section – ·················· 27 7-7. Schematic Diagram – MAIN (2/3) Section – ·················· 28 7-8. Schematic Diagram – MAIN (3/3) Section – ·················· 29 7-9. Printed Wiring Board – POWER AMP Section – ··········· 30 7-10. Schematic Diagram – POWER AMP Section – ·············· 31 7-11. Printed Wiring Boards – PANEL Section –····················· 32 7-12. Schematic Diagram – PANEL Section – ························· 33 7-13. Printed Wiring Boards – LEAF SW Section – ················ 34 7-14. Schematic Diagram – LEAF SW Section – ···················· 35 7-15. Printed Wiring Boards – DRIVER Section – ·················· 36 7-16. Schematic Diagram – DRIVER Section – ······················ 37 7-17. Printed Wiring Board – TRANS Section –······················38 7-18. Schematic Diagram – TRANS Section – ························ 39

7-19. IC Pin Function Description·············································40 7-20. IC Block Diagrams ··························································· 42

CAUTION

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

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.

MODEL IDENTIFICATION

— BACK PANEL —

PART No.

8. EXPLODED VIEWS ······················································ 46

9. ELECTRICAL PARTS LIST ······································· 52

MODEL

E2, E3, EA, MY, SP, AR models MX, AUS models

PART No.

4-225-040-3s 4-225-040-4s

• Abbreviation AR : Argentine AUS : Australian E2 : 120 V AC Area in E model E3 : 240 V AC Area in E model

EA : Saudi Arabia MY : Malaysia MX : Mexican SP : Singapore

SECTION 1

SERVICE NOTE

Panel board

: melted-connection point

Cut the nine melted-connection points with cutting pliers.

Note for installing the panel board

Hot melt

Screw hole

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

+BVTP 2.6 × 8

)

LOCATION OF CONTROLS

• Front view

2 3 4 5

waw;

wg wh wj wk wl

e; ea es

ejeh

r; rs

SECTION 2

GENERAL

6 7 8

9 0 qa qs qd qf

qgqh

qj qk

1 DISC SKIP button 2 DISC 1 button and indicator 3 DISC 2 button and indicator 4 DISC 3 button and indicator 5 Z OPEN/CLOSE button 6 CD disc tray 7 Fluorescent indicator tube 8 EDIT, TUNER, MEMORY button 9 PLAY MODE, STEREO/MONO button q; REPEAT, DOLBY NR button qa DIRECTION button qs SURROUND button qd VOLUME knob qf Shuttle knob qg x button qh gG button qj PHONES jack qk Tape deck-B ql TAPE A/B button w; CD button wa Function indicator ws TUNER/BAND button wd MD (VIDEO) button wf ?/1 button and indicator wg DISPLAY button wh SPECTRUM button wj EQ EDIT button wk GROOVE button wl ECHO LEVEL knob (Saudi Arabia model) e; MIC LEVEL knob ea MIC2 jack (Saudi Arabia model) es MIC1 jack (Saudi Arabia model)

MIC jack (except Saudi Arabia model)

ed g, G, f, F button and indicator ef V-GROOVE button and indicator eg Tape deck-A eh – . button ej X button ek > + button el KARAOKE PON button r; CD SYNC HI-DUB ra REC PAUSE/START button and indicator rs ENTER button

Step 3: Setting the time

You must set the time before using the timer functions.

Press ENTER.

The minute indication flashes.

This section is extracted from instruction manual.

hH S s

2,4

Press CLOCK/TIMER SET.

The hour indication flashes.

HS s

3,5

Press . or > repeatedly to set the minute.

Press ENTER.

The clock starts working.

Tip

If you’ve made a mistake, start over from step 1.

To change the time

The previous explanation shows you 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.

Press . or > repeatedly to set the hour.

)

SECTION 3

DISASSEMBLY

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

CASE (TOP)

4 three

screws (case)

side panel L

9 case (top)

5 two

screws

(BVTP3

10)

7 two

(BVTP3

screws

8 claw

10)

side panel R

LOADING PANEL ASS’Y

CD mechanism deck (CDM58)

Turn the pulley (S) to the direction of arrow.

front panel side

pulley (S)

- bottom view -

Pull out the table.

loading panel ass'y

1 three

2 two

screws

(BVTP3

screws (case)

FRONT PANEL ASS’Y

CD mechanism deck

screw (BVTP3

10)

wire (flat type) (17 core) (CN304)

screw (BVTP3

connector (19 core) (CN201)

connector (CN601)

10)

connector (CN1)

BASE UNIT (Page 11) DRIVER/MOTOR/ SENSOR BOARDS (Page 11)

3 two

screws

(BVTP3

12)

TAPE MECHANISM DECK

connector (CN2)

front panel ass'y

bracket (heart cam L)

screw (BVTP2.6

five screws (BVTP2.6

connector (CN202)

× 8

)

screw (BVTP2.6

bracket (heart cam R)

× 8

LEAF SW/ HEAD (A)/ HEAD (B) BOARDS

)

(Page 10)

tape mechanism deck (TCM-230AWR11)

PANEL BOARD

)

knob (MIC)

2 two

screws

(BVTP2.6

× 8

)

FR knob

PANEL board

7 t

hree claws

three claws

five claws

6 two

screws

(BVTP2.6

CD switch board

: melted-connection point

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

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

× 8

)

bracket (FR)

vol knob

POWER TRANSFORMER (T971), TRANS BOARD

connector (CN975)

9 Remove the sixteen solderings.

connector (CN977)

7 two

(BVTP4

screws

× 8

)

8 power transformer

(T971)

7 two

TRANS board

screws

(BVTP4

× 8

back panel

3 six

screws

× 10

(BVTP3

)

2 two

screws

(BVTP3

× 10

)

connector (CN891)

MAIN/POWER AMP BOARDS

)

connector (CN503)

connector (CN502)

5 three

(BVTP3

screws

× 8

8 h

eat sink

)

7 two

screws

(BVTP3

× 8

3 MAIN

board

LEAF SW/HEAD (A)/HEAD (B) BOARDS

2 five claws

1 two

(BVTP3

screws

× 8

)

Remove the two solderings.

5 LEAF

6 POWER

4 two

screws

(BVTP3

× 16

SW board

Remove the two solderings.

AMP board

)

HEAD (A) board

6 ground point s

(PTT2

crew

HEAD (B) board

8 ground point s

(PTT2

Remove the four solderings.

crew

BASE UNIT

)

(BU-K2BD38)

two insulators

Base unit

two insulators

wire (flat type) (19 core) (CN101

DRIVER/MOTOR/SENSOR BOARDS

1 c

onnector (CN701)

tray

DRIVER board

screw (PTPWH2.6

9 MOTOR

screw (BVTP 2.6

board

2 four s

crews

(PTPWH 2.6)

two screws (+BVTP 2.6

wire (flat type) (8 core) (CN721

Remove the two solderings of motor.

connector (CN722)

SENSOR board

2 screw

(BVTP2.6

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 simulta-neously.

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

Procedure:

1. Press ?/1 button to turn the set ON.

2. Press CD button 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.

[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 DISC 1 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 OPEN/CLOSE simul-

taneously.

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 DISC2 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, 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. T o 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 ?/1 button to turn on the set.

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

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

4 When f (CURSOR UP) button is pressed, GEQ increases to

its maximum and a message “GEQ ALL MA” appears.

5. When F (CURSOR DOWN) button is pressed, GEQ decreases to its minimum and a message “GEQ ALL M1” appears.

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

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

8. 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.

9. 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, by oper ating the Shuttle knob. (It means that the memory is cleared.)

10. 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 DISC SKIP EXCHANGE and OPEN/CLOSE cannot be accepted. (It means that the tray motor and the turntable motor are disabled of their operation.)

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

12. 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.

13. 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.

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

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

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

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

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

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

[Aging Mode]

This mode can be used for operation check of CD section and tape deck section.

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

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

1. Operating method of Aging Mode

Turn on the main power and select “CD” of the function.

1) Set a disc in DISC1 tray. Select CONTINUE ALL DISCS (press the PLAY MODE button), and REPEAT OFF (press the REPEAT

button).

2) Load the tapes recording use into the decks A and B respectively.

3) Press three buttons x , ENTER , and

DISC SKIP/EX-CHANGE simultaneously.

4) Aging operations of CD and tape are started at the same time.

5) To exit the aging mode, perform [MC Cold Reset].

3. Aging Mode in CD section

1) Display state

• No error occurs

Display

AGING[*][*][*][*]

Note:

[*][*][*][*]

Error display

E ** s ## $$ %%

12 34 5

1 **

2 s 3 ##

4 $$

5 %%

: Number of aging operations

The error No. 00 indicates the newest error. As the error No. increases, it means the older error. When you want to retrieve the error history, press the PLAY MODE button in the case of mechanism error. Or press the REPEAT button in the case of NO DISC error.

M: Mechanism error Don’t care

High order digits only D: Stopped during closing due to problems other than mechanism. E: Stopped during opening due to problems other than mechanism. C: Stopped during chucking due to problems other than mechanism. F: Stopped during EX-opening due to problems other than mechanism.

Emergency related errors (High order digits only) 1: Stopped during chuck-up 2: Stopped during chuck-down 3: Time out by EX-OPEN 5: Time out by EX-CLOSE

D: No disc error 01: FOCUS ERROR

02: GFS ERROR 03: SETUP ERROR

01: NO DISC judgment without chucking retry 02: NO DISC judgment after chucking retry

Status at the time of NO DISC judgment (High order digits only) 1: STOP 2: SETUP 3: TOC READ 4: ACCESS 5: PLAY BACK 6: PAUSE 7: MANUAL SEARCH (PLAY) 8: MANUAL SEARCH (PAUSE)

• When the buttons x , ENTER and DISC 1 are pressed simultaneously, number of time of the mechanism error and the NO DISC error can be checked. Display: EMC**EDC** **: Number of times of error (Maximum three times)

EMC: Mechanism error EDC: NO DISC error

• When aging operation is complete, be sure to perform the MC Cold Reset to reset the error history.

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[*][*][*][*]” v alue 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

NO. Display action Action contents Final timing

1 TAPE A AG-1 Rewind the TAPE A, B The top of tape 2 TAPE A AG-2 FWD play the TAPE A 2 minutes playing 3 T APE A AG-3 F.F. the TAPE A 20 second FF or the end

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 T APE B AG-3 F .F . the T APE B 20 second FF or the end

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

of tape

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

[Function Change Mode]

* Select 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”.

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.

• T est 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)

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

set

MAIN board CN301 Pin 2 (GND)

level meter

+ –

2. Turn the adjustment scre w and check output peaks. If the peaks

–

set

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

MAIN board CN301 (Pin 3 : L-CH)

(Pin 1 : R-CH)

frequency counter

–

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

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

oscilloscope

wrong

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

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

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 so 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

Adjustment Location: Playback Head (Deck A).

Record/Playback/Erase Head (Deck B).

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 rotate 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 VIDEO. (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 PAUSE/START button, 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

CN301 (Pin 3 : L-CH)

level mete

–

Pin 1 : R-CH

recorded portion

set

CN301 (Pin 3 : L-CH)

level mete

–

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)

REC LEVEL (L)

PB LEVEL (L)

(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:

1. Press MD (VIDEO) button to select VIDEO. (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 PAUSE/START button, press REC PAUSE/ START button, then recording start.

PB LEVEL (R)

(A)

PB LEVEL (R)

[LEAF SW BOARD]

(Conductor Side)

REC LEVEL (R)

REC BIAS (L)

CN301

RV351

PB LEVEL (L)

REC BIAS (R)

TAPE SPEED

(HIGH)

RV303

(B)

RV301

RV352

RV302

RV353

RV1001

RV304

RV354

TAPE SPEED

(NORMAL)

RV1002

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 indicated.

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 on the flourescent indicator tube 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 wa of IC 601. Adjust T601 until the voltage becomes 0 V.

Adjustment Location: MAIN board

[MAIN BOARD] (Component side)

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 (AGCCON) 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 level within 4 ±1 Vp-p.

S-curve waveform

symmetry

within 4 ±1Vp-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.

NULL

T601

RV611

FM TUNED LEVEL

RF Level Check

oscilloscope

BD board

TP(RF) TP(VC)

Procedure :

1. Connect oscilloscope to TP (RF).

2. Connect between TP (AGCCON) 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.

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

Adjustment Location:

[BD BOARD] (Conductor side)

TP (VC)

TP (TEO)

level : 1.45 ± 0.3Vp-p

E-F Balance (1 Track Jump) Check

oscilloscope

BD board

TP (TEO) TP (VC)

–

Procedure:

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

2. Turned Power switch on.

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

4. Press the hH 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

Center of waveform

TP (RF)

TP (FEI)

TP (FEO)

IC103

TP (AGCCON)

IC101

TP (XPCK)

level=1.3±0.6Vp-p

Specification level: x 100=less than ±22%

Symmetry

A (DC voltage)

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

RF PLL Free-run Frequency Check

Procedure :

1. Connect frequency counter to test point (XPCK) with lead wire.

BD board

TP (XPCK)

frequency counte

–

2. Turned Power switch on.

3. Put the disc (YEDS-18) in to play the number five track. Confirm that reading on frequency counter is 4.3218MHz.

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