Sony HCDGRX-70-J Service manual

HCD-GRX70/GRX70J/RXD80

SERVICE MANUAL

HCD-GRX70/GRX70J/RXD80 are the Amplifier, CD player, Tape Deck and Tuner section in HMC-GRX70/GRX70J/RXD80.

Dolby noise reduction manufactured under license from Dolby Laboratories Licensing Corporation. “DOLBY” and the double-D symbol a are trademarks of Dolby Laboratories Licensing Corporation.

Photo: HCD-GRX70 (GRAY)

CD Section

Tape deck Section

Canadian Model

HCD-RXD80

E Model

HCD-GRX70/GRX70J

Australian Model

HCD-GRX70

Model Name Using Similar Mechanism HCD-GRX50/RXD7 CD Mechanism Type CDM38LH-5BD32L Base Unit Name BU-5BD32L Optical Pick-up Name KSS-213D/Q-NP Model Name Using Similar Mechanism HCD-GRX50/RXD7 Tape Transport Mechanism T ype TCM-230AWR2

Amplifier section

Canadian model: Continuous RMS power output (reference)

100 + 100 watts (8 ohms at 1 kHz, 10% THD)

Total harmonic distortion less than 0.07%

(8 ohms at 1 kHz, 55 W)

Other models: The following measured at AC 120, 220, 240 V 50/60 Hz DIN power output (rated) 130 + 130 watts

(6 ohms at 1 kHz, DIN)

Continuous RMS power output (reference)

170 + 170 watts (6 ohms at 1 kHz, 10% THD)

SPECIFICATIONS

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

kilohms

Outputs MD OUT: voltage 250 mV, (phono jacks) impedance 1 kilohms PHONES: accepts headphones of 8 ohms (stereo mini jack) or more SPEAKER: Canadian model: accepts impedance of 8 to 16 ohms SURROUND SPEAKER (GRX70/GRX70J):

accepts impedance of 16 ohms

SUPER WOOFER: Voltage 1 V, impedance 1 kilohm

– Continued on next page –

MINI Hi-Fi COMPONENT SYSTEM

MICROFILM

Specifications (continued)

CD player section

System Compact disc and digital audio system Laser Semiconductor laser (λ=780nm)

Emission duration: continuous

Laser output Max. 44.6 µW*

*This output is the value measured at distance of 200 mm from the objective lens surface on the Optical Pick-up

Block with 7 mm aperture. 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 600 nm Output Level -18 dBm

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

General

Power requirements Canadian model: 120 V AC, 60 Hz Mexican model: 120 V AC, 50/60 Hz Australian model: 230 - 240 V AC, 50/60 Hz Thai model: 220 V AC, 50/60 Hz Other models: 120 V, 220 V, or 230 - 240 V AC,

50/60 Hz Adjustable with voltage selector

Power consumption 170 watts Dimensions (w/h/d) Approx. 280 × 340 × 395 mm

(111/8 × 131/2 × 155/8 in.)

Mass Canadian model: Approx. 10.2 kg Other models: Approx. 10.6 kg Supplied accessories: AM loop antenna (1)

Remote Commander (1) Batteries (2) FM lead antenna (1) Speaker cords (2) Front speaker pads (8)

Design and specifications are subject to change without notice.

FM tuner section

Tuning range 87.5 - 108.0 MHz Antenna FM lead antenna Antenna terminals 75 ohm unbalanced Intermediate frequency 10.7 MHz

UKV tuner section (3 band (FM-AM-UKV) models only)

Tuning range 65.0 - 74.0 MHz

Stereo Plus

AM tuner section

Tuning range 2 Band type: Canadian model: 530 - 1,710 kHz

(with the interval set at 10 kHz)

531 - 1,710 kHz

(with the interval set at 9 kHz) Other models: 531 - 1,602 kHz

(with the interval set at 9 kHz)

530 - 1,710 kHz

(with the interval set at 10 kHz) 3 Band type: Middle Eastern models: MW: 531 - 1,602 kHz

(with the interval set at 9 kHz) SW: 5.95 - 17.90 MHz

(with the interval set at 5 kHz) Other models: MW: 531 - 1,602 kHz

(with the interval set at 9 kHz)

530 - 1,710 kHz

(with the interval set at 10 kHz) SW: 5.95 - 17.90 MHz

(with the interval set at 5 kHz) Antenna AM loop antenna Antenna terminals External antenna terminal Intermediate frequency 450 kHz

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! 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.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE ! SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

– 2 –

TABLE OF CONTENTS

SECTION 1

SERVICING NOTES

1. SERVICING NOTES ............................................... 3

2. GENERAL

Location of Controls ....................................................... 6

Setting the Time .............................................................. 7

3. DISASSEMBLY ......................................................... 8

4. TEST MODE.............................................................. 11

5. MECHANICAL ADJUSTMENTS....................... 14

6. ELECTRICAL ADJUSTMENTS

DECK Section ................................................................. 14

CD Section ...................................................................... 17

7. DIAGRAMS

7-1. Block Diagram – CD SERVO Section – ........................ 19

7-2. Block Diagram – TAPE DECK Section – ...................... 21

7-3. Block Diagram – MAIN Section –................................. 23

7-4. Block Diagram – DISPLAY/KEY CONTROL/

POWER SUPPLY Section – ........................................... 25

7-5. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 27

7-6. Printed Wiring Board – BD Board – .............................. 29

7-7. Schematic Diagram – BD Board – ................................ 31

7-8. Printed Wiring Boards – CD MOTOR Section – .......... 33

7-9. Schematic Diagram – CD MOTOR Section – .............. 35

7-10. Printed Wiring Board – AUDIO Board – ...................... 37

7-11. Schematic Diagram – AUDIO Board – ......................... 39

7-12. Printed Wiring Board – LEAF SW Board – .................. 41

7-13. Schematic Diagram – LEAF SW Board –..................... 41

7-14. Printed Wiring Board – MAIN Board – ........................ 43

7-15. Schematic Diagram – MAIN Board (1/4) –................. 45

7-16. Schematic Diagram – MAIN Board (2/4) –.................. 47

7-17. Schematic Diagram – MAIN Board (3/4) –.................. 49

7-18. Schematic Diagram – MAIN Board (4/4) –.................. 51

7-19. Printed Wiring Board – PANEL Board – ...................... 53

7-20. Schematic Diagram – PANEL Board – ......................... 55

7-21. Printed Wiring Board – CD SW Board – ...................... 57

7-22. Schematic Diagram – CD SW Board –......................... 58

7-23. Printed Wiring Boards

– TRANSFORMER Section – ........................................ 61

7-24. Schematic Diagram

– TRANSFORMER Section – ........................................ 63

7-25. IC Pin Function Description ........................................... 67

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 pick-up block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.

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 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.

CAUTION

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

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

8. EXPLODED VIEWS ................................................ 72

9. ELECTRICAL PARTS LIST ............................... 81

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

The following caution label is located inside the unit.

CAUTION : INVISIBLE LASER RADIATION WHEN OPEN AND

INTERLOCKS DEFEATED. AVOID EXPOSURE TO BEAM.

ADVARSEL : USYNLIG LASERSTRÅLING VED ÅBNING NÅR

SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION. UNDGÅ UDSAETTELSE FOR STRÅLING.

VORSICHT : UNSICHTBARE LASERSTRAHLUNG, WENN

ABDECKUNG GEÖFFNET UND SICHEREITSVERRIEGELUNG ÜBERBRÜCKT. NICHT DEM STRAHL AUSSETZEN.

VARO!: AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALT -

TIINA NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE. ÄLÄ KATSO SÄTEESEEN.

VARNING : OSYNLING LASERSTRÅLING NÄR DENNA DEL ÄR ÖPPNAD

OCH SPÄRREN ÄR URKOPPLAD. BETRAKTA EJ STRÅLEN.

ADVERSEL : USYNLIG LASERSTRÅLING NÅR DEKSEL ÅPNES OG

SIKKERHEDSLÅS BRYTES. UNNGÅ EKSPONERING FOR STRÅLEN.

VIGYAZAT!: A BURKOLAT NYITÁSAKOR LÁTHATATLAN LÉZERSU-

GÁRVESZÉLY

KERÜLJE A BESUGÁRZÁST!

– 3 –

MODEL IDENTIFICATION – Rear Panel –

PART No.

MODEL PART No.

Thai model 4-214-456-6π Argentine and 120 V AC Area in E models 4-215-169-0π Singapore model 4-215-169-1π Mexican model 4-215-169-2π Saudi Arabia model 4-215-169-3π GRX70J: 240 V AC Area in E model 4-215-169-5π Canadian model 4-219-987-0π GRX70: 240 V AC Area in E model 4-219-987-2π Taiwan model 4-219-987-3π Australian model 4-219-987-4π

– 4 –

HOW TO OPEN THE DISC TRAY WHEN POWER SWITCH TURNS OFF.

Remove the Case.

Pull-out the disc tray.

Turn the cam to the direction of arrow.

NOTE FOR INSTALLATION (ROTARY ENCODER)

BU cam

Section A

Groove

Note:When attaching the BU cam, engage the Rotary encoder switch as shown in the figure.

Note:When attaching the Base unit, Insert th section A into the groove of BU cam.

– 5 –

LOCATION OF CONTOROLS – Front Panel –

SECTION 2

GENERAL

This section is extracted from instruction manual.

@ª EDIT, DIRECTION, TUNER MEMORY

button PLAY MODE, DOLBY NR button REPEAT, STEREO/MONO button

#º EFFECT button

FILE SELECT button GEQ CONTROL button P FILE MEMORY button

#¡ FUNCTION button

– Rear Panel –

1 CD DIGITAL OUT terminal 2 VIDEO (AUDIO) IN jack 3 FM ANTENN A terminal 4 MD IN/OUT jack 5 SUPER WOOFER jack

6 SURROUND SPEAKER terminal (GRX70/GRX70J) 7 SPEAKER terminal

8 AM ANTENN A terminal 9 VOLTAGE SELECTOR switch

(GRX70: 120 V AC Area in E, 240 V AC Area in E, Saudi Arabia, Singapore, Taiwan, Argentine models)

– 6 –

– 7 –

SECTION 3

DISASSEMBLY

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

COVER

two screws (case 3TP2) (3

screw (case 3TP2) (3

12)

cover

three screws (BVTP3

screw (case 3TP2) (3

two screws (case 3TP2) (3

12)

LOADING PANEL ASS’Y

Turn the cam-in the direction of the arrow

Pull-out the disc tray.

loading panel ass’y

– 8 –

FRONT PANEL SECTION

)

screw (BVTT3

10)

front panel section

wire (flat type) (15 core) (32 cm) (CN303)

screw (BVTT3

screw (BVTP3

lug

10)

wire (flat type) (23 core) (CN501)

lug

screw (BVTT3

two screws (BVTT3

CD MECHANISM DECK SECTION (CDM38LH-5BD32L)

Remove the CD mechanism deck (CDM38LH-5BD32L) in the direction of arrows

– B.

screw (BVTP3

10)

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

two screws (BVTP3

– 9 –

screw (BVTP3

wire (flat type) (19 core) (CN391)

two connectors (CN392, 393)

10)

TAPE MECHANISM DECK SECTION (TCM-230AWR2)

Open two cassette lids.

Push the cassette lid.

three screws (BVTP2.6

two screws (BVTP2.6

tape mechanism deck section (TCM-230AWR2)

MAIN BOARD

• Abbreviation AR : Argentine model AUS : Australian model E2 : 120 V AC Area in E model E3 : 240 V AC Area in E model MX : Mexican model SP : Singapore model TH : Thai model TW : Taiwan model

connector (CN953) (GRX70/GRX70J)

Push the cassette lid.

two screws (BVTP3 × 8)

wire (flat type)

13 core: GRX70: E2, TH, MX, AR, AUS/RXD80

( )

15 core: GRX70: E3, SP, TW/GRX70J

(CN371)

five screws (BVTP3 × 8)

5

screw (BVTP3 × 8) (GRX70/GRX70J)

connector (CN952)

Remove the MAIN board in the direction of the arrow.

– 10 –

two screws (BVTP3 × 8)

connector (CN403)

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. Turn the power ON or set to the DEMO mode.

2. Press three buttons of p , [ENTER/NEXT], and 1/u simulta-

neously.

3. The set is reset, and displays “COLD RESET”, then becomes

DEMO mode.

[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. Turn the power ON or set to the DEMO mode.

2. Press three buttons of p , [ENTER/NEXT], and [DISC1] si-

multaneously.

3. The set is reset, and becomes standby state.

[Change-over the AM Tuning Interval] (EXCEPT Saudi Arabia model)

• The AM tuning interval can be changed over 9 kHz or 10 kHz.

Procedure:

1. Press the 1/u button to turn the power ON.

2. Select the function “TUNER”, and press the [TUNER/BAND]

button to select the BAND “AM”.

3. Press the 1/u button to turn the power OFF.

4. Press the [ENTER/NEXT] and 1/u buttons simultaneously,

and the display on the fluorescent indicator tube changes to “AM 9 k STEP” or “AM 10 k STEP”, and thus the tuning interval is changed over.

[CD Service Mode]

• This mode can run the CD sled motor optionally. Use this mode, for instance, when cleaning the optical pick-up.

Procedure:

1. Press the 1/

2. Select the function “CD”.

3. Press three buttons of p , [ENTER/NEXT], and § simulta-

neously.

4. Set to the Sled Servo mode.

5. With the CD in stop status, turn the JOG dial clockwise to

move the optical pick-up to outside track, or turn it counterclockwise to inside track.

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

1) Move the optical pick-up to the most inside track.

2) Disconnect the power cord.

Notes: • Always move the optical pick-up to most inside track when

u button to turn the power ON.

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

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

[CD Delivery Mode]

• This mode moves the optical pick-up to the position durable to vibration. Use this mode when returning the set to the customer after repair.

Procedure:

1. Press the 1/

2. Press the [LOOP] and 1/u buttons simultaneously.

3. A message “LOCK” is displayed on the fluorescent indicator

tube, and the CD delivery mode is set.

[LED and Fluorescent Indicator Tube All Lit, Key Check Mode]

Procedure:

1. Press three buttons of p , [ENTER/NEXT], and [DISC2] si-

multaneously.

2. LEDs and fluorescent indicator tube are all turned on.

Press the [DISC2] button, and the key check mode is activated.

3. In the key check mode, the fluorescent indicator tube displays

“K 0 J0 V0”. Each time a button is pressed, “K” value increases. However , once a button is pressed , it is no longer taken into account. “J” value increases like 1, 2, 3 ... if turn the JOG dial clockwise, or it decreases like 0, 9, 8 ... if turn the JOG dial counterclockwise. “V” value increases like 1, 2, 3 ... if turn the [VOLUME] dial clockwise, or it decreases like 0, 9, 8 ... if turn the JOG dial counterclockwise.

4. To exit from this mode, press three buttons in the same man-

ner as step 1, or disconnect the power cord.

u button to turn the power ON.

– 11 –

[Aging Mode]

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

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

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

Procedure:

1. Set disc in DISC1 tray.

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

3. Press the [PLAYMODE] button to set the “ ALL DISCS” mode,

and press the [REPEAT] button to “REPEAT” off.

4. Press the [FUNCTION] button to select the function “CD”.

5. Press three buttons of p , [ENTER/NEXT], and [DISCSKIP/

EX-CHANGE] simultaneously.

6. The aging mode is activated, if the indicator of disc tray num-

ber on the fluorescent indicator tube is blinking.

7. T o 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”)

• Display at an error occurred

1) Display of the error count (1) Press three buttons of p , [ENTER/NEXT], and [CDSYNC]

simultaneously.

(2) Display of the error count following as below.

Display

EMC**EDC

Notes:

EMC**: The number of mechanical error. EDC**: The number of no disc error after chucking the disc.

2) Display of mechanical error

Display

E**M##$$&&

1. Display at the Aging Mode

• Display operating state of CD section and tape deck section alternately.

• If an error occurred, stop display which that section.

2. CD Section

• Display at the aging mode is the same as the normal operation.

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

Aging mode sequence (CD section) :

Turn the disc tray

Disc1 chucking

TOC read

Play track1 for 2 seconds

Play last track for 2 seconds

Notes:

: The number of mechanical error.(“00” is latest one)

(Press the [PLAYMODE] button to changes next error display) ## : Not used. $$ : Loading error. (Second figure is not used)

D: The error in the midst of close at the except mechanical trouble. E : The error in the midst of open at the except mechanical trouble. C : The error in the midst of chuck up at the except mechanical

trouble.

F : The error in the midst of EX-open at the except mechanical

trouble.

&&: Loading error. (Second figure in not used)

1:The error in the midst of chuck up. 2:The error in the midst of chuck down. 3:Time up of EX-open 4:Time up of EX-close.

3) Display of no disc error

Display

E**D##$$&&

Notes:

: The number of mechanical error.(“00” is latest one)

(Press the [REPEAT] button to changes next error display) ##:

01:Focus error 02:GFS error 03:Set up error

$$:

00:No disc error when does not chucking retry. 02:No disc error when chucking retry to completion.

&&: The state when judged no disc error. (Second figure is not used)

1: Stop 2: Set up 3: TOC read 4: Access 5: Play 6: Pause 7: Manual search (Play) 8: Manual search (Pause)

– 12 –

3. 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 A AG-4”

2 minutes

Rewind the tape B

“TAPE B AG-5”

Shut off

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

– 13 –

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

31 to 71 g • cm

(0.43 – 0.98 oz • inch)

2 to 6 g • cm

(0.03 – 0.08 oz • inch)

31 to 71 g • cm

(0.43 – 0.98 oz • inch)

2 to 6 g • cm

(0.03 – 0.08 oz • inch)

71 to 143 g • cm

(0.99 – 1.99 oz • inch)

100 g or more

(3.53 oz or more)

100 g or more

(3.53 oz or more)

DECK SECTION

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 RCH.

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

8. Set to the DOLBY NR OFF.

9. Set to the test mode. (1) Press the 1/u button to turn the power ON. (2) Select the function “TAPE A or B”. (3) Press the button of p , [ENTER/NEXT], and [DISC3]

simultaneously, to set the tape deck test mode and blink the indicator of disc tray number on the fluorescent indicator tube.

(4) To exit from the test mode, press the 1/u button.

• Test Ta pe

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

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 MD OUT jack (J101) L-CH, R-CH

set

level mete

+ –

– 14 –

2. Turn the adjustment screw and check output peaks. If the peaks do not match for L-CH and R-CH, turn the adjustment screw so that outputs match within 1dB of peak.

Tape Speed Adjustment

Mode: Playback

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

DECK B

frequency counter

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

main board test tape P-4-A100 (10 kHz, –10 dB)

L-CH

MAIN board CN301 set

R-CH

in phase 45°90°135°180

MD OUT jack (J101)

L-CH

R-CH

waveform of oscilloscope

good

oscilloscope

wrong

4. Repeat step 1 to 3 in playback (REV) mode.

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

set

main board MD OUT jack (J101) L-CH, R-CH

+ –

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

2. Press the ( button on the deck B.

3. Press the [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 ± 180 Hz.

5. Press the [HI-DUB] button. Then back to NORMAL speed mode.

6. Adjust RV1002 on the LEAF SW board so that frequency counter reads 3,000 ± 90 Hz.

Adjustment Location: LEAF SW board Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)

(WS-48B)

Playback level Adjustment DECK A DECK B

Procedure:

Mode: Playback

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

set

main board MD OUT jack (J101) L-CH, R-CH

level meter

–

Adjustment Location:Playback Head (Deck A).

Record/Playback/Erase Head (Deck B).

forward

reverse

Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301 (L-CH) and RV401 (R-CH) so that adjustment within adjustment level as follows.

Adjustment Level:

J101 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: AUDIO board

– 15 –

REC Bias Adjustment DECK B

Procedure:

1. Mode: Record FUNCTION: VIDEO

main board VIDEO (AUDIO) IN jack (J101) L-CH, R-CH



50 mV (–23.8 dB)

 

600

Ω

AF OSC

1) 315 Hz

2) 10 kHz

attenuator

2. Mode: Playback

set

blank tape CN-123

Specification values:

J101 PB level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)

Adjustment Location: MAIN board

– MAIN BOARD (Conductor Side) –

RV301

IC301

RV351

REC LEVEL

VIDEO (AUDIO) IN

J101

MD OUT

(L/R)

recorded portion

set

main board MD OUT jack (J101) L-CH, R-CH

level meter

+ –

3. Confirm playback the signal recorded in step 1 become specification values as follows. If these values are out of specification values, adjust the R V341 (L-CH) and RV441 (R-CH) on the AUDIO board to repeat steps 1and 2.

Specification values: Playback output of 315 Hz to playback

output of 10 kHz: ± 0.5 dB

Adjustment Location: AUDIO board

REC Level Adjustment DECK B

Procedure:

1. Mode: Record FUNCTION: VIDEO

main board VIDEO (AUDIO) IN jack (J101) L-CH, R-CH

AF OSC

315 Hz, 50 mV (–23.8 dB)

Ω

attenuator

600

blank tape CS-123

set

– AUDIO BOARD (Component Side) –

RV441

RV401

RV301

PB LEVEL

– DECK B –

– LEAF SW BOARD (Component Side) –

TAPE SPEED



(NORMAL) (HIGH)

RV1002



RV1001

IC602

RV341



REC BIAS



CN601

CN1001

RV311

PB LEVEL

– DECK A –

RV411



2. Mode: Playback

recorded portion

set

main board MD OUT jack (J101) L-CH, R-CH

level meter

+ –

3. Confirm playback the signal recorded in step 1 become specification values as follows. If these values are out of specification values, adjust the R V301 (L-CH) and R V351 (R-CH) on the MAIN board to repeat steps 1 and 2.

– 16 –

CD SECTION

+ –

BD board

TP (TE) TP (VC)

oscilloscope

)

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 10 MΩ 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

oscilloscope

BD board

TP (FE) TP (VC)

+ –

E-F Balance (1 Track Jump) Check

Procedure :

1. Connect oscilloscpe to TP (TE) and TP (VC).

2. Turn the power ON.

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

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

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

Procedure:

1. Connect oscilloscope to TP (FE).

2. Connect between TP (FE1) and TP (VC) by lead wire.

3. Connect between TP (AGCCON) and TP (GND) by lead wire.

4. Turn the power 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. Cofirm 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

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.

RF Level Check

oscilloscope

BD board

1 track jump waveform

level = 1.3

Specified level: × 100 = less than ± 22%

0.6 Vp-p symmetry

A B

A (DC voltage

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

center of waveform

TP (TE) TP (VC)

+ –

Procedure:

1. Connect oscilloscope to TP (RF).

2. Connect between TP (AGCCON) and TP (GND) by lead wire .

3. Turn the power ON.

4. Load a disc (YEDS-18) and playback.

5. Confirm that the 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.

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

level:

0.3 Vp-p

1.45

– 17 –

Checking Location:

– BD BOARD (Side B) –

TP (VC)

TP (RF)

IC103

IC102

TP (TE)

TP (GND)

(AGCCON)

TP (FE)

TP (FE1)

– 18 –

SECTION 7

DIAGRAMS

HCD-GRX70/GRX70J/RXD80

7-1. BLOCK DIAGRAM – CD SERVO Section –

RF AMP,

DETECTOR

OPTICAL PICK-UP (KSS-213D/Q-NP)

LASER DIODE

I-V AMP

CD D+5V

AUTOMATIC

POWER

CONTROL

Q101

FOCUS/TRACKING ERROR AMP

F I-V AMP

E I-V AMP

IC103

SUMMING

AMP

APC LD

AMP

RF EQ

FOCUS

ERROR AMP

TRACKING

ERROR AMP

APC PD

AMP

HOLD SW

RFO

LDON

FILTER

54 56

FILO

PCO

CLTV

RFAC

ASYI ASYO

DIGITAL

CLV

MDP

ASYMMETRY CORRECTION

XRST

49 48

DIGITAL

SUBCODE

PROCESSOR

XLON

XLAT

DATA

14 5

PLL

CPU INTERFACE

CLOK

SENS

DIGITAL SIGNAL PROCESSOR,

DIGITAL FILTER, D/A CONVERTER

FILI

EFM

DEMODULATOR

SERVO AUTO

SEQUENCER

SQSO

SCOR

1 2

16K

RAM

SQCK

IC101 (1/2)

CORRECTOR

SERVO

INTERFACE

SCLK

COUT

9 21

D/A

INTERFACE

INTERNAL BUS

ERROR

SSTP

EMPH

WFCK

GFS

64 15

ON :

S101

(LIMIT)

When the optical pick-up is inner position.

PCMD

BCK LRCK C2PO

SERIAL

INTERFACE

DIGITAL

62 63 61 19

OUT

DOUT

DIGITAL

FILTER,

NOISE SHAPER

TO MIRR/DFCT/ FOK DETECTOR

PWM

INTEGRATOR

AOUT1

AOUT2

CLOCK

GENERATOR

X101

CD DIGITALOUT

OPTICAL OPTICAL

TRANSCEIVER

CD-L

IC381

(Page 23)

BUFFER

TIMING

LOGIC

LOUT1

LOUT2

XTAI

XTAO

R-CH

66 67

16.9344MHz

AIN1

AIN2

(TRACKING)

(FOCUS)

2-AXIS

DEVICE

M101

(SPINDLE)

M102

(SLED)

FOCUS/TRACKING COIL DRIVE,

SPINDLE/SLED MOTOR DRIVE

IC102

CH4OUTF

17 18

12 11

14 13

CH4OUTR

CH3OUTF CH3OUTR

CH2OUTF CH2OUTR

CH1OUTF CH1OUTR

MOTOR

DRIVE

MOTOR

DRIVE

COIL

DRIVE

COIL

DRIVE

CH4SIN

CH3FIN

CH3RIN

CH2FIN

CH2RIN

CH1FIN

CH1RIN

MUTE

24 23

SFDR

SRDR

5 6

2 3

TFDR

TRDR

FFDR

FRDR

PWM GENERATOR

FOCUS/TRACKING/SLED

RFDC

A/D

CONVERTER

SERVO DSP

FOCUS/TRACKING/SLED

DIGITAL SERVO

PROCESSOR

IC101 (2/2)

MIRR/DFCT/

FOK

DETECTOR

TO SERVO INTERFACE

FOK

MIRR

DFCT

24 22 23

SQ-CLK

SQ-DATA

SCOR

SENSE

CD-CLK

XLT CD-DATA

HOLD

SYSTEM CONTROLLER

(CD MECHANISM CONTROL)

IC501 (1/4)

XRST

DISC-SENS

TBL-SENS

OUT-OPEN

ENC1 ENC2 ENC3

LOAD-OUT

LOAD-IN

TBL-L TBL-R

69 68

66 67

63 65

LEVEL SHIFT

Q701

(OPEN/CLOSE DET)

470

ROTARY

ENCODER

S811

DISC TRAY SLIDE MOTOR DRIVE

FIN

RIN

DISC TRAY TURN MOTOR DRIVE

IN1

IN2

DISC TRAY SENSOR

S801

OPEN

IC801

MOTOR

DRIVE

IC701

MOTOR

DRIVE

DISC IN DETECT

SENSOR

IC703

IC702

DISC TRAY

ADDRESS DETECT

OUT1

OUT2

OUT1

OUT2

(DISC TRAY SLIDE)

(DISC TRAY TURN)

M801

M701

– 19 – – 20 –

• SIGNAL PATH : CD PLAY (ANALOG OUT) : CD PLAY (DIGITAL OUT)

HCD-GRX70/GRX70J/RXD80

7-2. BLOCK DIAGRAM – TAPE DECK Section –

HP101

(PLAYBACK)

L-CH

R-CH R-CH

HRPE101 (1/2)

(RECORD/PLAYBACK)

L-CH

R-CH R-CH

R-CH

PB EQ AMP

(DECK A)

IC611

PB EQ AMP

(DECK B)

IC601

REC/PB SWITCHING

IC602

R-CH

RV311

PB LEVEL (L)

(DECK A)

RV301

PB LEVEL (L)

(DECK B)

DECK PROCESS

DECK A/B SELECT, PB/REC EQ AMP,

DOLBY NR AMP, ALC, AMS

AIN (L)

BIN (L)

BIAS (N)

BIAS (C)

S1004

(DECK A 120/70)

S1008

(DECK B 120/70)

BIAS (M)

CONTROL

B NORM/CROM

A 120/70

IC301

BIAS

CIRCUIT

ALC ON/OFF

1516182022 23242517

NORM/HIGH

PB A/B

120

R-CH

NR ON/OFF

BIAS ON/OFF

RM ON/OFF

L.P.F.

BUFFER

AMS

CIRCUIT

REC/PB/PASS

LM ON/OFF

MAOUT

MSIN

MSOUT

RIN (L)

ALC (L)

DOLBY PASS

ALC

ROUT (L) 35 34

DOLBY NR

AMP

CIRCUIT

ALC

IN (L)

REC OUT (L) 39

RV301

REC LEVEL (L)

(DECK B)

EQ IN (L)

REC

EQ AMP

PB OUT (L)

EQ OUT

• SIGNAL PATH : PLAYBACK (DECK A)

(L)

PB-L

REC-L

(Page 23)

(Page 24)

: PLAYBACK (DECK B) : RECORD

RV441

REC BIAS (R)

(DECK B)

HRPE101 (2/2)

(ERASE)

R-CH

RV341

REC BIAS (L)

(DECK B)

BIAS OSC

T621

BIAS OSC

Q621, 622

REC BIAS

SWITCH

Q623

C331, L331

BIAS

TRAP

B+

(A+7V)

D+5V

100

TC-RELAY

(DECK A PLAY)

8584838281 807978

PB-A/B

EQ-H/N

ALC-ON/OFF

A-PLAY-SW

S1001

(DECK B PLAY)

BIAS

B-PLAY-SW

S1002

R/P-PASS

REC-MUTE

NR-ON/OFF

TC-MUTE

S1003

(DECK A HALF)

AMS-IN

DETECT SENSOR

A-HALF

(DECK B HALF)

(DECK A REC)

(DECK B REC)

ROTATION

(DECK A)

IC1001

A-SHUT

S1006

S1005

S1009

ROTATION

DETECT SENSOR

(DECK B)

IC1002

B-SHUT

SYSTEM CONTROLLER

B-HALF

IC501 (2/4)

TRIGGER PLUNGER

DECK A

TRIGGER

PLUNGER DRIVE

(DECK A)

Q333, 334

A-TRG

TRIGGER PLUNGER

DECK B

TRIGGER

PLUNGER DRIVE

(DECK B)

Q331, 332

B-TRG

Q335

CAP-M-H/L

RV1001

TAPE SPEED

(HIGH)

CAPM-CNT1 CAPM-CNT2

CAPSTAN MOTOR

CONTROL SWITCH

Q1001

MOTOR DRIVE

RV1002

TAPE SPEED

(NORMAL)

CAPSTAN

Q336 – 343

(CAPSTAN)

– 21 –

– 22 –

HCD-GRX70/GRX70J/RXD80

7-3. BLOCK DIAGRAM – MAIN Section –

(GRX70J: Saudi Arabia)

DIGITAL ECHO

IC711

J711

(Page 20)

(Page 22)

VIDEO

(AUDIO) IN

(Page 25)

MIX MIC

MD IN

CD-L

PB-L

J101 (1/2)

SPEANA

ANTENNA

R-CH

MIC AMP

IC712 (1/2)

65 66 68 69 67

FM/AM TUNER UNIT

RV712

MIC LEVEL

IN E2 IN D2

INPUT

IN B2

SELECT

IN A2

SWITCH

IN C2

R-CH

INPUT SELECT SWITCH,

GRAPHIC EQUALIZER CONTROL,

ELECTRICAL VOLUME

IC101

RV711

ECHO LEVEL

SOUND

CONTROL

CIRCUIT

MIC AMP

IC712 (2/2)

KEY IN2

KEY IN1

KEY OUT 2

60 5 59 6

KEY OUT 1

BASS FREQ.

2 58 57

MIC IN

REC A2

R-CH

493-DATA

493-CLK

493-LATCH

DBFB-H/L

L+R

47 48 38

GRAPHIC EQUALIZER

CONTROL CIRCUIT

D607

D644

REC B2

F OUT2

42 41

REC-L

J101 (2/2)

J191

SUPER

WOOFER

FAN MOTOR

Q401, 402

SURROUND SPEAKER IMPEDANCE USE 16Ω

DRIVE

R-CH

SUPER

WOOFER

BUF

OUT2

FEED BACK

SWITCH

Q112

D191

R-CH

D141

PROTECT

SWITCH

Q192

MUTING

Q191

VOL IN2

VOLUME

CONTROL

COMMAND

CPU

INTERFACE

DATA

CLOCK

LATCH 34

BASS BOOST

CONTROL

CIRCUIT

BB B2,

BB A2

38, 39

BUF IN2 373233

DBFB CONTROL

SWITCH

Q111

CONTROL SWITCH

BASS FREQUENCY

Q201

R-CH

IMPEDANCE

–1

–2

USE 6 – 16Ω

MD OUT

TM402

+ –

TM401

SPEAKER

+ –

(Page 22)

M501 (FAN)

75Ω

• SIGNAL PATH : TUNER (FM/AM)

: CD PLAY : TAPE PLAY

: RECORD : MIC INPUT

(Page 25)

RESET

FM ANT

AM ANT

ST-L

ST-R

ST-MUTE

STEREO

TUNED ST-DIN

ST-DOUT

ST-CLK

ST-CE

R-CH

X601

32.768kHz

X613

16MHz

49 50 51

53 54 55 52

ST-MUTE STEREO TUNED

ST-DOUT ST-DIN ST-CLK ST-CE

XC-OUT

XC-IN

X-OUT

X-IN

SYSTEM CONTROLLER

IC501 (3/4)

STK-MUTE

LINE-MUTE

AC-CUT

RESET

PROTECTOR

F-RELAY

RY-SW

POWER AMP

IC801

MUTING

Q113

R-CH

MUTING CONTROL

SWITCH

Q508, 509

RESET SWITCH

Q501

STANDBY SWITCH

Q803, 804, 881

+5V

RESET SIGNAL

GENERATOR

IC502

R-CH

TH831

OVER LOAD

DETECT

Q801

DC DETECT

SWITCH

Q433, 434

TEMPERATURE

DETECT SWITCH

Q831, 832

D803

R-CH

MUTING CONTROL

OVER LOAD

DETECT SWITCH

PROTECT SWITCH

Q439

Q432

SWITCH

Q412

OVER LOAD

DETECT SWITCH

PROTECT SWITCH

Q435, 436

Q437

MUTING

Q411, 471

RELAY DRIVE

Q431

J701

PHONES

RY401

– 23 –

– 24 –

HCD-GRX70/GRX70J/RXD80

7-4. BLOCK DIAGRAM – DISPLAY/KEY CONTROL/POWER SUPPLY Section –

FLUORESCENT INDICATOR TUBE DRIVER,

KEY CONTROL

IC601

BAND-PASS FILTER

IC603

SPEANA

(Page 23)(Page 23)

RESET

(RXD80)

+5V REGULATOR

IC11

SUB POWER TRANSFORMER

RECT

D12 – 15

T11

GRID DRIVE

Q607 – 612

FL601

FLUORESCENT INDICATOR TUBE

GRID DRIVE

Q613

S611 – 630,

S638 – 651, 751 – 757

REMOTE CONTROL

RECEIVER

IC602

S601

(JOG DIAL)

S602

VOLUME

ROTARY

ENCODER

S601

ROTARY

ENCODER

S602

46 – 67

S1 – S22

32 – 27

G13 – G18

G2 – G12

44 – 42, 40 – 33

GR1

11 – 14

KEY0 – KEY3

SIRCS

JOG-A

JOG-B

VOL-A

VOL-B

S LOW FREQ (BPF0)

BPF1 BPF2

BPF3 BPF4

ALL BAND (L+R)

RESET

L SEL

LED DATA

LED SCK

LED LAT

I2C DATA

I2C CLK

WAKE UP

16 17 18 19 20

5 3 4

78 79

F01

F02

F04

14 13 12

13 14 15

30 29

DET

F05 F06

L+R

DET

LED DRIVER

IC604

DATA CLK STB

SYSTEM CONTROLLER

IC501 (4/4)

IIC-DATA IIC-CLK

WAKE UP

LINE

B.P.F.

17, 19 – 23, 2, 3, 5, 7, 10, 11

P1 – P6, P8, P9, P11, P12, P15, P16

FL SW

STBY RELAY

CD-POWER

POWER

REC IN

42 43

B+ SWITCH

Q601, 602

D611 – 616, 619 – 622, 624,

D627 – 631, 751 – 753

Q603

(RXD80)

LED +5V

CD SENSOR CIRCUIT B+

SYSTEM CONTROLLER

(IC501) B+

(PANEL SECTION B+)

CD D+5V, CD A+5V

CD MECHANISM DECK

SECTION B+

D+5V

M62493FP (IC101),

+5V

+5V (STBY)

D501, 502

D509

B+ SWITCH

Q907, 908

B+ SWITCH

Q904, 905

(RXD80)

(GRX70/GRX70J)

(RXD80)

D925

(GRX70/GRX70J)

(RXD80)

D923

(GRX70/GRX70J)

(RXD80)

–26V

(FL DRIVER (IC601) B–)

REGULATOR

TC, PANEL,

REGULATOR

CONTROL SWITCH

Q903, 923

(RXD80)

+5V

IC902

AUDIO

POWER AMP (IC801), PROTECTOR CIRCUIT

(GRX70/GRX70J)

+7V

–7V

–26V REGULATOR

Q13

TO FLUORESCENT

INDICATOR TUBE

(FL601)

REGULATOR

Q901, 902, 913

REGULATOR

Q914, 951, 952

FL ON/OFF

SWITCH

Q12, 17

FL ON/OFF

SWITCH

Q14 – 16

VF1 VF2

B+ B–

–26V REGULATOR

Q971

+7V

–7V

RECT

D17 – 20

RELAY DRIVE

POWER TRANSFORMER

(GRX70/GRX70J)

RECT D832

RECT D831

RECT D971

RECT

D901 – 904

RECT

D907 – 910

Q11

RY11

T951

GRX70: Thai, Mexican, Australian/RXD80

VOLTAGE

SELECTOR

S951

GRX70: E2, E3, Singapore, Hong Kong, Taiwan, Argentine/GRX70J

AC IN

GRX70/ GRX70J

AC IN

STBY LED

TIMER LED

XOUT

X601

12.5MHz

XIN

LED DRIVE

Q604, 605

LED DRIVE

Q606

– 25 –

D754

I/u

D632

TIMER SELECT

D+5V

(TAPE DECK SECTION B+)

LED +5V

(PANEL SECTION B+)

D922

(GRX70/GRX70J)

(RXD80)

D924

(GRX70/GRX70J)

CD M+7V

(CD MOTOR SECTION B+)

TC M+12V

(TC MOTOR SECTION B+)

ST +10V

(FM/AM TUNER UNIT B+)

FAN MOTOR B–

+10V

REGULATOR

Q909

D405 – 407

REGULATOR

IC901

+12V

REGULATOR

IC903

– 26 –

+7V

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