Sony HCD-GRX2, HCD-RX33 Service Manual

HCD-GRX2/RX33

MICROFILM

SERVICE MANUAL

HCD-GRX2/RX33 is the tuner, deck, CD and amplifier section in MHC-GRX2/RX33.

Photo : HCD-GRX2

Model Name Using Similar Mechanism HCD-G101

SECTION

TAPE

DECK

SECTION

CD Mechanism Type CX3 Base Unit Type KSM-213BCM Optical Pick-up Type KSS-213B/S-N Model Name Using Similar Mechanism HCD-G101

Tape Transport Mechanism Type

US Model

Canadian Model

HCD-RX33

E Model

Australian Model

HCD-GRX2

DECK-A TK20FX-SW943-800 DECK-B TK20FX-SW943-800

SPECIFICATIONS

AUDIO POWER SPECIFICATIONS: (U.S.A. model only)

POWER OUTPUT AND TOTAL HARMONIC DISTORTION: with 6 Ω loads both channels driven, from 70 – 20,000 Hz; rated 25 W per channel minimum RMS power, with no more than 0.9% total harmonic distortion from 250 mW to rated output.

Amplifier section

North American model

Continuous RMS power output

35 W + 35 W (6 Ω at 1 kHz, 10% THD)

Other models

The following measured at AC 110, 220 V 60 Hz; DIN power output (Rated) 25 W + 25 W (6 Ω at 1 kHz, DIN) Continuous RMS power output (Reference)

30 W + 30W (6 Ω at 1 kHz, 10% THD)

The following measured at AC 120, 240 V 60 Hz; DIN power output (Rated) 30 W + 30 W (6 Ω at 1 kHz, DIN) Continuous RMS power output (Reference)

35 W + 35W (6 Ω at 1 kHz, 10% THD)

Peak music power output (Reference)

400 W

Outputs

PHONES (stereo phone jack) :

accepts headphones of 8 Ω or more

SPEAKER : accepts impedance of 6 to 16 Ω

CD player section

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

Emission duration: continuous

Laser output Max. 44.6 µW*

*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. Frequency response 20 Hz – 20 kHz (± 0.5 dB) Wavelength 780 – 790 nm

Tape deck section

Recording system 4 -track 2 -channel stereo Frequency response 60 – 13,000 Hz (± 3dB), using Sony

TYPE Ι cassette

— Continued on next page —

MINI Hi-Fi COMPONENT SYSTEM

SERVICING NOTE

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range 87.5 – 108.0 MHz Antenna FM lead antenna Antenna terminal 75 Ω unbalanced Intermediate frequency 10.7MHz

AM tuner section

Tuning range

European, Australian and South African models:

531 – 1,602 kHz

Other models: 530 – 1,710 kHz Antenna AM loop antenna Antenna terminals External antenna terminal Intermediate frequency 450 kHz

General

Power requirements

Mexican model: 120 V AC, 50/60 Hz

Australian and South African models:

220 – 240 V AC, 50/60 Hz

Other models: 120V AC, 60Hz Power consumption 80 W Dimensions (w/h/d) incl. projecting parts and controls

Approx. 280 × 320 × 371 mm

(11 1/8 × 12 5/8 × 14 5/8 in) Mass Approx. 7.2 kg (15 lb 14 oz.) Supplied accessories: AM loop antenna (1)

Remote RM-SG5 (1)

FM lead antenna (1)

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.

Design and specifications are subject to change without notice.

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.

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.

This caution label is located inside the unit.

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 IDENTIFÉS PAR 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 PIÈSES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.

— 2 —

SAFETY CHECK-OUT

After correcting the original service problem, perform the following safety checks before releasing the set to the customer: Check the antenna terminals, metal trim, “metallized” knobs, screws, and all other exposed metal parts for AC leakage . Check leakage as described below.

LEAKAGE

The AC leakage from any exposed metal part to earth Ground and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microampers). Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA WT -540A. Follo w the manufactur ers’ instructions to use these instruments.

2. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a VOM or battery-operated A C voltmeter . The “limit” indication is 0.75 V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A)

T o Exposed Metal

Parts on Set

TABLE OF CONTENTS

1. GENERAL .......................................................................... 4

2. DISASSEMBLY

2-1. CD Door ............................................................................. 5

2-2. CD Mechanism Deck ......................................................... 5

2-3. Front Panel ......................................................................... 6

2-4. Main Board and H.P Board ................................................ 6

2-5. CD Tray .............................................................................. 7

2-6. CD Decoder Board ............................................................. 7

2-7. Base Unit ............................................................................ 8

2-8. Cassette Lid (L)/(R)............................................................ 8

3. MECHANICAL ADJUSTMENTS ............................... 9

4. ELECTRICAL ADJUSTMENTS ................................. 9

5. DIAGRAMS

5-1. Circuit Boards Location ................................................... 14

5-2. Brock Diagrams

• Deck Section ................................................................... 15

• Tuner/CD Section............................................................ 17

5-3. IC Brock Diagrams...........................................................19

5-4. Schematic Diagram —Main Section — ........................... 24

5-5. Printed Wiring Board — Main Section — ....................... 29

5-6. Printed Wiring Board —CD Section — ........................... 34

5-7. Schematic Diagram —CD Section —..............................39

5-8. Schematic Diagram — Panel Section — ......................... 43

5-9. Printed Wiring Board —Panel Section —........................ 47

5-10. IC Pin Function ................................................................ 52

0.15

Fig. A. Using an AC voltmeter to check AC leakage.

1.5 k

Ω

Earth Ground

Voltmeter (0.75 V)

6. EXPLODED VIEWS

6-1. Cabinet Section................................................................. 54

6-2. Front Panel Section .......................................................... 55

6-3. Cassette Button Section.................................................... 56

6-4. Cassette Mechanism Deck Section................................... 57

6-5. CD Mechanism Deck Section 1 ....................................... 58

6-6. CD Mechanism Deck Section 2 ....................................... 59

6-7. Base Unit Section (KSM-213BCM)................................. 60

7. ELECTRICAL PARTS LIST ........................................ 61

— 3 —

LOCATION OF PARTS AND CONTROLS

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SECTION 1

GENERAL

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1 Disc tray 2 DISC 1 button 3 DISC 2 button 4 DISC 3 button 5 DISC SKIP button 6 § OPEN/CLOSE button 7 DBFB button 8 VOLUME knob 9 Display window !º CLOCK TIMER SET button !¡ TIMER ON/OFF button !™ DISPLAY DEMO !£ TUNER/BAND !¢ · ∏ (play/pause) button !∞ ENTER/NEXT button !§ ≠ ± CD AMS/TUNER PRESET TIMER

SET buttons

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!¶ FILE SELECT !• I/u (POWER) button !ª TUNER MEMORY REPEAT button @º EDIT button @¡ STEREO/M NO, PLAY MODE button @™ TAPE button @£ π (STOP) button @¢ 0 ) CD/TUNER button @∞ PHONES jack @§ Deck A, PLAY/REC @¶ Deck B, PLAY @• Tape operaying buttons

r (recording) ( (play) 0 (fast rening) ) (fast forward) p 6 (stop/eject) P (pause)

— 4 —

SECTION 2

DISASSEMBLY

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

2-1. CD DOOR

Two craws

CD door

Pull out the CD tray and remove the CD door

with releasing claws into the direction of arrow.

2-2. CD MECHANISM DECK

Screw (+PTPWH 3 × 10)

CD mechanism deck

Flat type wire (CN09)

Two screws (+B 3 × 8)

Two screws (+BVTP 3 × 10)

Harness (CN302)

— 5 —

Screw (+PTPWH 3 × 10)

2-3. FRONT PANEL

Connector (CN401)

Front panel

Screw

(+PTPWH 3 × 10)

Screw (+BVTP 3 × 10)

HOW TO SET THE POWER CORD

Screw (+BVTP 3 × 10)

Two screw (+BVTP 3 × 10)

Two screws

(+BVTP 3 × 10)

Screw (+PTPWH 3 × 10)

2-4. MAIN BOARD AND H.P BOARD

Three screws

(+BVTP 3 × 10)

Harness (CN204)

Harness (CN303)

H.P board

Connector

Connector (CN202)

Connector (CN201)

power cord

MAIN board

— 6 —

Craw

Two screws

(+KTP 3 × 8)

)

2-5. CD TRA Y

Bracket

Screw (+P 2.6 × 4)

CD tray

Bracket

Flat type wire

(CN06)

Screw (+P 2.6 × 4

2-6. CD DECODER BOARD

CD DECODER board

Two screw

(+BVTP 3 × 10)

Sheet

Craw

Two screws (+BVTP 3 × 10)

Flat type wire (CN06)

Flat type wire (CN01)

Connector (CN05)

!º

Connector (CN03)

Two craws

Belt

— 7 —

Two screws (+BVTP 3 × 10)

)

2-7. BASE UNIT

UD-Cam

Screw (+PTPWH 2.6 × 8)

UD-gear

Spring

2-8. CASSETTE LID (L) / (R)

Cassette lid (L)

Spring

Base unit

Spring

Two screws (+KTP 3 × 8

Four craws

— 8 —

Cassette lid (R)

SECTION 3

MECHANICAL ADJUSTMENTS

SECTION 4

ELECTRICAL ADJUSTMENTS

Precaution

1. Clean the following parts with a denatured alcohol-moistened swab: record/playback head 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

Torque

FWD FWD

back tension

FF/REW

Torque meter

CQ-102C

CQ-201B

Meter reading

40 to 70 g • cm

(0.56 - 0.97 oz • inch)

1 to 5 g • cm

(0.01 - 0.07 oz • inch)

55 to 140 g • cm

(0.76 - 1.94 oz • inch)

DECK SECTION 0 dB=0.775V

1. Demagnetize the record/playback head with a head damagnetizer.

2. Do not use a magnetized screwdriver for the adjustments.

3. After the adjustments, apply suitable locking compound to the parts adjusted.

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.

Tape

P-4-A100

WS-48B

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 (10kHz, –10dB)

Signal

10 kHz, –10 dB

3 kHz, 0 dB

SPEAKER terminal (JK501)

Used for

Azimuth Adjustment

Tape Speed Adjustment

level meter

set

+ –

— 9 —

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

L-CH peak

screw position

R-CH peak

output level

within 2dB

L-CH peak

R-CH peak

within 2dB

screw position

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

Adjustment Location:

Remove the cassette lid before adjustment (See page 8)

Adjustment screws REC/PB head (deck A) or PB head (deck B)

3. Mode: Playback

test tape P-4-A100 (10kHz, –10dB)

in phase 45˚ 90˚ 135˚ 180˚

SPEAKER terminal (JK501) (L-CH)

set

SPEAKER terminal (JK501) (R-CH)

Waveform of oscilloscope

good

oscilloscope

wrong

Tape Speed Adjustment (Deck A)

Procedure:

1. Mode: Playback

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

set

SPEAKER terminal (JK501)

frequency counter

+ –

2. Adjust the SFR201 so that the frequency counter reads 3,000 Hz ± 90Hz.

Adjustment Location: MAIN board

Sample Value of Wow and flutter

W. RMS (JIS) within 0.3% (test tape: WS-48B)

[MAIN BOARD] — Component side —

— 10 —

Tape Speed

SFR201

CN204

TUNER SECTION 0 dB=1µV

AM T uning Voltage Adjustment

Main board

TP1

F G VT

DC voltmeter

+ –

Procedure:

1. Set the reception frequency of the unit to 530 kHz.

2. Adjust L105 for 1.2 ± 0.05 V reading on the DC voltmeter.

3. Set the reception frequency of the unit to 1,710 kHz.

4. Confirm that the voltage reading on the DC voltmeter is within

8.0 ± 0.5 V.

Adjustment Location: MAIN board (See page 12)

AM Trac king Adjustment

loop antenna

AM RF SSG

loop antenna (Supplied accessories)

set

30% amplitude modulation by 400 Hz signal

60 cm

Field strength dB (

V/m) =SSG output level dB (µV/m) –26 dB.

Procedure:

1. Tune the set to 600 kHz.

2. Set the output of AM RF SSG so that the input level of the set will become 60 dB (µV/m).

3. Adjust L104 so that when the waveform on the oscilloscope is maximum, no noise appears.

4. Tune the set to 1,400 kHz.

FM T uning Voltage Adjustment

Main board

TP1 IF G VT

DC voltmeter

+ –

Procedure :

1. Set the reception frequency of the unit to 87.5 MHz.

2. Adjust L103 for 1.2 ± 0.05V reading on the DC voltmeter.

3. Set the reception frequency of the unit to 108 MHz.

4. Confirm that the voltage reading on the DC v oltmeter is within

7.8 ± 0.5V.

AM ANTENNA terminal (TM1)

5. Adjust TC102 so that when the waveform on the oscilloscope is maximum, no noise appears.

• Repeat the procedures in each adjustment several times, and the

tracking adjustment should be finally done by the trimmer capacitors.

Adjustment Location: MAIN board (See page 12)

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