Sony TAFB-940-R Service manual

TA-FB940R

SERVICE MANUAL

AEP Model

UK Model

E Model

Australian Model

Photo: BLACK model

SPECIFICATIONS

Amplifier section

DIN power output

Except UK, Singapore, Malaysia: 120 W + 120 W (4 Ω at 1 kHz) 80 W + 80 W (8 Ω at 1 kHz)

UK, Singapore, Malaysia model: 95 W + 95 W (4 Ω at 1 kHz) 60 W + 60 W (8 Ω at 1 kHz)

Total harmonic distortion

Less than 0.008% (at 10 W output 1 kHz)

Frequency response

PHONO (20 Hz - 20 kHz): RIAA equalization curve

±0.5 dB

TUNER, SACD/CD, AUX, TAPE1/DAT, TAPE2/MD: 7 Hz - 300 kHz +0–3 dB

S/N (network A)

General

System

Power amplifier: Pure-complementary SEPP OCL power amplifier with all stages directly coupled Preamplifier: Low-noise, equalizer amplifier

Power requirements

230 V AC, 50/60 Hz

Power consumption

210 W

Dimensions (approx.) (w/h/d)

430 × 150 × 420 mm

incl. projecting parts and controls

Mass (approx.)

10.3 kg

PHONO 94 dB

TUNER, SACD/CD, AUX, TAPE1/DAT, TAPE2/MD: 105 dB

Output voltage/impedance

REC OUT 1, 2: 150 mV, 1 kΩ

PHONES: 10 mW (at 8 Ω)

Speakers impedance

4 - 16 Ω, 8 - 16 Ω (SPEAKERS A+B)

Damping factor

500 (8 Ω, 1 kHz)

Supplied accessories

•Remote commander (remote) (1) RM-S336

•Sony batteries R6 (size-AA) (2)

Design and specifications are subject to change without notice.

INTEGRATED STEREO AMPLIFIER

1

TABLE OF CONTENTS
1. GENERAL ..........................................................................	3
2. ELECTRICAL ADJUSTMENT .....................................	4
3. DIAGRAMS
3-1. Circuit Boards Location ........................................................	5
3-2. Schematic Diagram – Input Section – ..................................	6
3-3. Printed Wiring Board – Input Section – ................................	7
3-4. Schematic Diagram – Main Section – ..................................	8
3-5. Printed Wiring Board – Main Section – ................................	9
3-6. Schematic Diagram – Panel Section – ................................	10
3-7. Printed Wiring Board – Panel Section – .............................	11
3-8. Schematic Diagram – Power Section – ...............................	12
3-9. Printed Wiring Board – Power Section – ............................	13
3-10. IC Block Diagrams ............................................................	14
3-11. IC Pin Function .................................................................	14
4. EXPLODED VIEW
4-1. Case Section ........................................................................	15
4-2. Front Panel Section .............................................................	16
4-3. Chassis Section ...................................................................	17
5. ELECTRICAL PARTS LIST ........................................	18

SAFETY-RELATED COMPONENT WARNING !!

COMPONENTS IDENTIFIED BY MARK 0OR 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.

2

SECTION 1

GENERAL

Front Panel Descriptions

1

2

3

4

5

6

7

8

9

10

11

12

	22	21	20	19	18	17	16	15	14	13
1	PROTECTION indicator							12	VOLUME knob
2	POWER button							13	SOURCE DIRECT button and indicator
3	Remote sensor							14	TAPE MONITOR knob
4	EON LINK indicator							15	SUBSONIC button
5	TAPE 1/DAT indicator							16	LOUDNESS button
6	TAPE 2/MD indicator							17	BALANCE knob
7	AUX indicator							18	TREBLE knob
8	SACD/CD indicator							19	BASS knob
9	TUNER indicator							20	SPEAKERS knob
10	PHONO indicator							21	PHONE jack
11	INPUT SELECTOR knob							22	EON LINK button

This section is extracted from instruction manual.

Rear Panel Descriptions
1	2	3			4	5
						AC OUTLET
						SWITCHED 100W MAX
PHONO					IMPEDANCE USE 4–16Ω
IN	SIGNAL
	GND				A+B USE 8–16Ω
L	U				BI WIRE USE 4–16Ω
				SPEAKERS
R		+	R	–	– L +
		B

L					L		EON CONTROL
					A
R					R
IN	IN	IN	REC OUT IN	REC OUT IN	+ R –	– L	+
TUNER	SACD/	AUX	TAPE2/MD	TAPE1/DAT			IN
	CD

qa 09 8 7			6
1 PHONO	4 EON CONTROL IN	6 Mains lead	9 AUX
2 U (SIGNAL GND)	5 AC OUTLET	7 TAPE1/DAT	0 SACD/CD
3 SPEAKERS A/B	(Except UK, Singapore, Malaysia)	8 TAPE2/MD	qa TUNER

3

SECTION 2

ELECTRICAL ADJUSTMENT

Bias Adjustment

NOTE:

1.Perform the adjustment after the unit has warmed up sufficiently.

2.Perform the bias adjustment if the power transistor has been replaced.

Procedure:

1.Rotate fully the bias adjusting semi-fixed resistors (RV500, RV600) to the MIN position (counterclockwise).

2.Connect a digital voltmeter to the CN500 and CN600.

	1 pin	2 pin
CN500 (L-CH)	+	–
CN600(R-CH)	+	–

3.Set the slide regulator to 0V, and press the POWER button (ON) on the set.

4.Raise gradually the slide regulator voltage up to the rated voltage.

5.At this time, confirm that the SP relay is turned on (it will click).

6.Adjust the RV500 and RV600 so that a reading of digital voltmeter is 7 ± 1 mV.

7.Return the slidack to 0 V, and press the POWER button (OFF) on the set.

Adjustment Location :

[MAIN BOARD] – COMPONENT SIDE –

1 2

CN500

(L-CH)

RV500

Bias (L-CH)

RV600

Bias (R-CH)

2 1 CN600 (R-CH)

+	+
DIGITAL	DIGITAL
VOLTMETER	VOLTMETER

4

SECTION 3

DIAGRAMS

3-1. CIRCUIT BOARDS LOCATION

PS board	OUTLET board
	(EXCEPT UK, SP, MY)
PANEL board
	SP-TM board

SIRCS board

PHONO board

SIRCS SUB board

HP board

TONE board	INPUT board
	MAIN board
	S-D LED board
	VOL board

THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.

(In addition to this, the necessary note is printed in each block.)

For schematic diagrams.

Note:

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

•All resistors are in Ω and 1/4 W or less unless otherwise specified.

•f : internal component.

•2: nonflammable resistor.

•5: fusible resistor.

•C: panel designation.

Note: The components identified by mark 0or dotted line with mark 0are critical for safety.

Replace only with part number specified.

•U : B+ Line.

•V : B– Line.

•H: adjustment for repair.

•Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions.

no mark : POWER ON

•Voltages are taken with a VOM (Input impedance 10 MΩ). Voltage variations may be noted due to normal production tolerances.

•Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal production tolerances.

•Circled numbers refer to waveforms.

•Signal path.

F : TUNER

•Abbreviation

G : German model.

EE : East European model.

AUS : Australian model.

SP	: Singapore model.
MY	: Malaysia model.

For printed wiring boards.

Note:

•X: parts extracted from the component side.

•Y: parts extracted from the conductor side.

•b: Pattern from the side which enables seeing.

•Indication of transistor

BC E

These are omitted

TA-FB940R

WAVEFORM

1

3.8Vp-p

4MHz

IC902 1 XOUT

5 5

TA-FB940R
3-2. SCHEMATIC DIAGRAM – INPUT SECTION –
						EXCEPT	UK, SP, MY
		2SD2525
*C101 – 105, 201 – 205			0R140		+15V
EXCEPT UK, SP, MY
				82	–15V
*	470		10	1W		JW11
	16V	22	63V		+B
						UK, SP, MY
		25V			GND
						MODEL
*		22			–B		16V
					(Page 8)
*	470	25V	10
	16V
SACD/CD			63V
*			0R240
		2SB1640		82
				1W
*
*					(Page 10)	UK, SP, MY
						MODEL
						JW12
							16V
*
*
						EXCEPT	UK, SP, MY
*
*
	(Page 10)
				6	6

TA-FB940R

3-3. PRINTED WIRING BOARD – INPUT SECTION – • See page 5 for Circuit Boards Location.

• Semiconductor	• Semiconductor
Location	Location
(INPUT Board)	(PHONO Board)

Ref. No.	Location
D100	D-5
D101	D-4
D102	D-4
D103	C-4
D104	B-4
D105	A-4
D106	A-4
D107	D-5
D108	C-7
D140	C-9
D240	C-9
Q100	C-6
Q101	C-6
Q102	C-6
Q103	C-7
Q104	C-7
Q105	C-7
Q140	C-9
Q240	D-9

Ref. No.	Location
D170	B-1
IC150	A-2
Q150	A-3
Q151	A-3
Q250	B-3
Q251	B-3

*C101 – 105, 201 – 205 EXCEPT UK, SP, MY

*

*

*

*

*

*

*

*

*

*

7 7

TA-FB940R

3-4. SCHEMATIC DIAGRAM – MAIN SECTION – • See page 14 for IC Block Diagrams.

8

8

*

*

*

*

*

*

* C511, 512, 611, 612 * R533, 534, 633, 634 EXCEPT UK, SP, MY

*