Sony HCDRX-33 Service manual

HCD-RX33

SERVICE MANUAL				AEP Model
				UK Model
HCD-RX33 is the tuner, deck, CD and
amplifier section in MHC-RX33.
		Model Name Using Similar Mechanism		HCD-G101
	CD	CD Mechanism Type		CX3
	SECTION	Base Unit Type		KSM-213BCM
		Optical Pick-up Type		KSS-213B/S-N
	TAPE	Model Name Using Similar Mechanism		HCD-G101
	DECK	Tape Transport	DECK-A	TK20FX-SW943-800
	SECTION	Mechanism Type
			DECK-B	TK20FX-SW943-800

SPECIFICATIONS

The following measured at AC 230 V 50 Hz;

DIN power output (Rated) 25 W + 25 W (6 Ω at 1 kHz, DIN) Continuous RMS power output (Reference)

35 W + 35W (6 Ω at 1 kHz, 10% THD)

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
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	531 – 1,602 kHz
Antenna	AM loop antenna
Antenna terminals	External antenna terminal
Intermediate frequency	450 kHz

— Continued on next page —

MINI Hi-Fi COMPONENT SYSTEM

MICROFILM

General
Power requirements	230V AC, 50/60Hz
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)

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.

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.

SERVICING NOTE

NOTES ON HANDLINGTHE 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.

This caution label is located inside the unit.

— 2 —

	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.	Block Diagrams
•	Deck Section ...................................................................	15
•	Tuner/CD Section ............................................................	17
5-3.	IC Block 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
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 —

SECTION 1

GENERAL

LOCATION OF PARTS AND CONTROLS

1		2					3				4						5			6

!•
9	7
	!¶

!º !¡ !™ !£

8

!¢ !

!§

!ª @º @¡

@™

@£

@¢

@

@§

@¶

@•

1

Disc tray

!¶

FILE SELECT

2

DISC 1 button

!•

I/u (POWER) button

3

DISC 2 button

!ª

TUNER MEMORY REPEAT button

4

DISC 3 button

@º

EDIT button

5

DISC SKIP button

@¡ STEREO/M NO, PLAY MODE button

6

§OPEN/CLOSE button

@™

TAPE button

7

DBFB button

@£

(STOP) button

8

VOLUME knob

@¢

0 )CD/TUNER button

9

Display window

@

PHONES jack

!º

CLOCK TIMER SET button

@§

Deck A, PLAY/REC

!¡

TIMER ON/OFF button

@¶

Deck B, PLAY

!™

DISPLAY DEMO

@•

Tape operaying buttons

!£

TUNER/BAND

r

(recording)

!¢ · (play/pause) button

(

(play)

!

ENTER/NEXT button

0 (fast rewind)

!§ ± CD AMS/TUNER PRESET TIMER

) (fast forward)

SET buttons

p 6 (stop/eject)

P

(pause)

— 4 —

SECTION 2

DISASSEMBLY

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

2-1. CD DOOR

2 CD door

Two claws

1Pull out the CD tray and remove the CD door with releasing claws into the direction of arrow.

2-2. CD MECHANISM DECK

1 Two screws (+B 3 × 8)

6 CD mechanism deck

4 Flat type wire (CN09)

5 Harness (CN302)

2 Screw (+PTPWH 3 × 10)

3 Two screws (+BVTP 3 × 10)

2 Screw (+PTPWH 3 × 10)

— 5 —

2-3. FRONT PANEL

3 Screw (+BVTP 3 × 10)

4 Screw (+BVTP 3 × 10)

5 Two screws (+BVTP 3 × 10)

6 Two screws (+BVTP 3 × 10)

7Screw

(+PTPWH 3 × 10)

1 Connector (CN401)

9 Front panel

7 Screw (+PTPWH 3 × 10)

8 Screw (+BVTP 3 × 10)

HOW TO SET THE

POWER CORD

power cord

2 Three screws (+BVTP 3 × 10)

2-4. MAIN BOARD AND H.P BOARD

3 Connector

2 Harness (CN204)	4 Connector (CN202)
1 Harness (CN303)	5 Connector (CN201)
8 H.P board	7 MAIN board

6 Two screws (+KTP 3 × 8)

Craw

— 6 —

2-5. CD TRAY

1 Screw (+P 2.6 × 4)

2 Bracket

5 Flat type wire (CN06)

3 Screw (+P 2.6 × 4)

4 Bracket

6 CD tray

2-6. CD DECODER BOARD

7 CD DECODER board

8 Two screw (+BVTP 3 × 10)

9 Sheet

Claw

Claw

Two claws

1 Two screws (+BVTP 3 × 10)

6 Flat type wire (CN06)

5 Flat type wire (CN01)

4 Connector (CN05)

!º Connector (CN03)

3 Belt	2 Two screws (+BVTP 3	× 10)

— 7 —

2-7. BASE UNIT

4 Screw (+PTPWH 2.6 × 8)

2 Screw (+PTPWH 2.6 × 8)

3 UD-gear

5 UD-Cam

7 Spring

6 Spring

8 Spring

1 Two screws (+KTP 3 × 8)

9 Base unit

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

1 Cassette lid (L)

Four claws

Four claws

2 Cassette lid (R)

— 8 —

SECTION 3

MECHANICAL 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	Torque meter	Meter reading
	FWD	CQ-102C	40 to 70 g • cm
			(0.56 - 0.97 oz • inch)
	FWD	CQ-102C	1 to 5 g • cm
	back tension		(0.01 - 0.07 oz • inch)
	FF/REW	CQ-201B	55 to 140 g • cm
			(0.76 - 1.94 oz • inch)

SECTION 4

ELECTRICAL ADJUSTMENTS

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 R- CH.

Tape	Signal	Used for
P-4-A100	10 kHz, –10 dB	Azimuth Adjustment
WS-48B	3 kHz, 0 dB	Tape Speed 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
(10kHz, –10dB)	SPEAKER	level meter
	terminal (JK501)
set		+
		–

— 9 —

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 2 dB of peak.

L-CH peak

	output	within
	level
		2dB	within 2dB

R-CH

peak

screw position

L-CH	R-CH		screw
			position
peak	peak

3.Mode: Playback

test tape P-4-A100 (10kHz, –10dB)

SPEAKER terminal (JK501)

(L-CH)

oscilloscope

L

set

R

SPEAKER terminal (JK501) (R-CH)

Waveform of oscilloscope

in phase	45˚	90˚	135˚	180˚
	good			wrong

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)

Tape Speed Adjustment (Deck A)

Procedure:

1. Mode: Playback

test tape
WS-48B	frequency counter
(3kHz, 0dB)
set	+
	–

SPEAKER terminal (JK501)

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 —

Tape Speed	SFR201

CN204

— 10 —

TUNER SECTION		0 dB=1µV

AM Tuning Voltage Adjustment

Main board	DC voltmeter

	TP1
F
G
VT	+
	–

Procedure:

1.Set the reception frequency of the unit to 531 kHz.

2.Adjust L108 for 1.2 ± 0.05 V reading on the DC voltmeter.

3.Set the reception frequency of the unit to 1,602 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 Tracking Adjustment

	loop antenna		loop antenna
			(Supplied accessories)
AM RF SSG
			set
30% amplitude		60 cm	AM ANTENNA
			terminal (TM1)
modulation by
400 Hz signal	Field strength dB ( V/m) =SSG output level dB ( V/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 L107 so that when the waveform on the oscilloscope is maximum, no noise appears.

4.Tune the set to 1,400 kHz.

5.Adjust TC101 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)

— 11 —

FM Tuned Level Adjustment

FM RF SSG

75 Ω coaxial

set

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

FM ANTENNA terminal (JK101)

Procedure:

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

2.Tune the set to 98 MHz.

3.Adjust SFR101 to the point (moment) when the TUNED indicator will change from going off to going on.

Adjustment Location: MAIN board

Adjustment Location

[MAIN BOARD] — Component side —

JK501

		AM Tuning
	FM Tuned Level	Voltage
		L108	JK101
			AM
	SFR101	TC101	Tracking
		L107
IC103	IC102
	TP1

— 12 —

CD SECTION

Note:

1.CD Block is basically constructed 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 10MW 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.

5.Adjust the focus bias adjustment when optical block is replaced.

Focus Bias Adjustment

DC voltmeter

CD DECODER board

RF Level Check

CD DECODER	oscilloscope
board
TP (RF)
CN12 (VC)

Procedure :

1.Connect oscilloscope to test point TP (RF) on CD DECODER board.

2.Turned Power switch on.

3.Put disc (YEDS-18) in and playback.

4.Confirm that oscilloscope waveform is clear and check RF signal level is correct or not.

Note: Clear RF signal waveform means that the shape “ à” can be clearly distinguished at the center of the waveform.

CN12

FEO +

VC

–

Procedure:

1.Connect DC voltmeter to test point CN12 (FEO), (VC) on CD DECODER board.

2.Turned Power switch on.

3.Put disc (YEDS-18) in and stop.

4.Adjust VR01 so that the DC voitmeter reading is 0 ± 20 mV.

Adjustment Location: CD DECODER board

Focus Gain Adjustment (VR02)

This gain has a margin, so even if it is slightly off. There is no problem.

Therfore, do not perform this adjusment.

Please note that it should be fixed to mechanical center position when you moved and do not know original position.

Adjustment Location

[CD DECODER BOARD] — Component side —

VOLT/DIV: 200 mV

TIME/DIV: 500 nS

+0.3 level: 1.0 –0.2 Vp-p

Adjustment Location: CD DECODER board

Focus Gain

CN12

VR02

IC03

IC01

VR01

RF Level

R07

Focus Bias

— 13 —