Sony TA-FB720R / TA-FB820R Service Manual ▷ View online
– 1 –
MICROFILM
AEP Model
SPECIFICATIONS
SERVICE MANUAL
INTEGRATED STEREO AMPLIFIER
TA-FB720R/FB820R
Photo : TA-FB820R
– 2 –
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.
TABLE OF CONTENTS
1. GENERAL
.......................................................................... 3
2. ELECTRICAL ADJUSTMENT
..................................... 4
3. DIAGRAMS
3-1. Circuit Boards Location ........................................................ 5
3-2. Schematic Diagram – Input Section – .................................. 7
3-3. Printed Wiring Board – Input Section – ................................ 9
3-4. Schematic Diagram – Main Section – ................................ 11
3-5. Printed Wiring Board – Main Section – .............................. 13
3-6. Schematic Diagram – Panel Section – ................................ 15
3-7. Printed Wiring Board – Panel Section – ............................. 17
3-8. Schematic Diagram – Power Section – ............................... 19
3-9. Printed Wiring Board – Power Section – ............................ 21
3-10. IC Block Diagrams ............................................................ 23
3-11. IC Pin Function ................................................................. 24
3-2. Schematic Diagram – Input Section – .................................. 7
3-3. Printed Wiring Board – Input Section – ................................ 9
3-4. Schematic Diagram – Main Section – ................................ 11
3-5. Printed Wiring Board – Main Section – .............................. 13
3-6. Schematic Diagram – Panel Section – ................................ 15
3-7. Printed Wiring Board – Panel Section – ............................. 17
3-8. Schematic Diagram – Power Section – ............................... 19
3-9. Printed Wiring Board – Power Section – ............................ 21
3-10. IC Block Diagrams ............................................................ 23
3-11. IC Pin Function ................................................................. 24
4. EXPLODED VIEW
4-1. Case and Back Panel Section .............................................. 25
4-2. Front Panel Section ............................................................. 26
4-3. Chassis Section ................................................................... 27
4-2. Front Panel Section ............................................................. 26
4-3. Chassis Section ................................................................... 27
5. ELECTRICAL PARTS LIST
........................................ 28
– 3 –
Front Panel Descriptions
SECTION 1
GENERAL
1
PROTECTION indicator
2
U (Power) button
3
Remote sensor
4
TAPE 1/DAT indicator
5
TAPE 2/MD indicator
6
AUX indicator
7
CD indicator
8
TUNER indicator
9
PHONO indicator
10
INPUT SELECTOR knob
11
VOLUME knob
12
SUBSONIC button
13
SOURCE DIRECT button and indicator
14
LOUDNESS button
15
TAPE MONITOR knob
16
BALANCE knob
17
TREBLE knob
18
BASS knob
19
SPEAKERS knob
20
PHONE jack
21
EON LINK button
This section is extracted from
instruction manual.
instruction manual.
10
3
2
1
9
7
8
4
6
5
11
13
12
14
15
16
17
18
19
20
21
– 4 –
SECTION 2
ELECTRICAL ADJUSTMENT
Bias Adjustment
NOTE:
NOTE:
1. Perform the adjustment after the unit has warmed up sufficiently.
2. Perform the bias adjustment if the power transistor has been
2. Perform the bias adjustment if the power transistor has been
replaced.
Procedure:
1. Rotate fully the bias adjusting semi-fixed resistors (RV500,
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.
3. Set the slide regulator to 0V, and press the U 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
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 10 ± 0.1 mV.
7. Return the slidack to 0 V, and press the U button (OFF) on the
set.
Adjustment Location :
[MAIN BOARD] – COMPONENT SIDE –
1 pin
3 pin
–
–
+
+
CN500 (L-CH)
CN600(R-CH)
+
CN600 (R-CH)
1
3
3
CN500 (L-CH)
1
3
3
RV600
Bias (R-CH)
Bias (R-CH)
RV500
Bias (L-CH)
Bias (L-CH)
DIGITAL
VOLTMETER
VOLTMETER
DIGITAL
VOLTMETER
VOLTMETER
+