Sony WX-C770 Service Manual ▷ View online
– 1 –
Model Name Using Similar Mechanism
NEW
CD Drive Mechanism Type
MG-338T-121
Optical Pick-up Name
KSS-520A
Model Name Using Similar Mechanism
WX-C570
Tape Transport Mechanism Type
MG-52A-135
SERVICE MANUAL
E Model
WX-C770
CHANGER CONTROL AUDIO MASTER
MICROFILM
CD player section
Signal-to-noise ratio
96 dB
Frequency response
10 - 20,000 Hz
Wow and flutter
Below measurable limit
Cassette player section
Tape track
4-track 2-channel stereo
Wow and flutter
0.08 % (WRMS)
Frequency response
30 - 18,000 Hz
Signal-to-noise ratio
Cassette type
Dolby B NR
Dolby NR off
TYPE II, IV
67 dB
58 dB
TYPE I
64 dB
55 dB
Tuner section
FM
Tuning range
FM tuning interval:
50 kHz/200 kHz switchable
87.5 - 108.0 MHz
(at 50 kHz step)
87.5 - 107.9 MHz
(at 200 kHz step)
50 kHz/200 kHz switchable
87.5 - 108.0 MHz
(at 50 kHz step)
87.5 - 107.9 MHz
(at 200 kHz step)
Antenna terminal
External antenna connector
Intermediate frequency
10.7 MHz
Usable sensitivity
9 dBf
Selectivity
75 dB at 400 kHz
Signal-to-noise ratio
65 dB (stereo),
68 dB (mono)
68 dB (mono)
Harmonic distortion at 1 kHz
0.5% (stereo),
0.3% (mono)
0.3% (mono)
Separation
35 dB at 1 kHz
Frequency response
30 - 15,000 Hz
Capture ratio
4 dB
SPECIFICATIONS
– Continued on next page –
CD
Section
Section
TC
Section
Section
Dolby noise reduction manufactured under license from Dolby Labo-
ratories Licensing Corporation.
“DOLBY” and the double-D symbol
ratories Licensing Corporation.
“DOLBY” and the double-D symbol
a
are trademarks of Dolby
Laboratories Licensing Corporation.
AM
Tuning range
AM tuning interval:
9 kHz/10 kHz switchable
531 - 1,602 kHz
(at 9 kHz step)
530 - 1,710 kHz
(at 10 kHz step)
9 kHz/10 kHz switchable
531 - 1,602 kHz
(at 9 kHz step)
530 - 1,710 kHz
(at 10 kHz step)
Antenna terminal
External antenna connector
Intermediate frequency
10.71 MHz/450 kHz
Sensitivity
30
µ
V
Graphic equalizer section
Center frequency
63 Hz, 160 Hz, 400 Hz,
1 kHz, 2.5 kHz, 6.3 kHz,
16 kHz
1 kHz, 2.5 kHz, 6.3 kHz,
16 kHz
Variable range
±
12 dB
Power amplifier section
Outputs
Speaker outputs
(sure seal connectors)
(sure seal connectors)
Speaker impedance
4 - 8 ohms
Maximum power output 35 W
×
4 (at 4 ohms)
– 2 –
SERVICE NOTE
CAUTION
Use of controls or adjustments or performance of proce-
dures other than those specified herein may result in haz-
ardous radiation exposure.
dures other than those specified herein may result in haz-
ardous radiation exposure.
Notes on Chip Component Replacement
•
Never reuse a disconnected chip component.
•
Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
aged by heat.
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown 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.
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown 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, ob-
serve from more than 30 cm away from the objective lens.
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission, ob-
serve from more than 30 cm away from the objective lens.
NOTES ON PICK-UP FLEXIBLE BOARD
The pick-up flexible board in this set is secured to the optical pick-
up with an adhesive tape. Once the tape is removed, an adhering
force becomes weak, and it cannot be reused.
Therefore, if the optical pick-up is replaced, replace also the pick-
up flexible board with a new one.
up with an adhesive tape. Once the tape is removed, an adhering
force becomes weak, and it cannot be reused.
Therefore, if the optical pick-up is replaced, replace also the pick-
up flexible board with a new one.
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.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
optical pick-up
Apply CD lens cleaner B-4 (Part No.:J-2501-000-A) to cotton swabs
(narrow type) (Part No.:J-2501-023-A) to be lightly wet. Use a force
(about 5 g) to make the objective lens in contact with the bottom
lightly, and clean the lens by spirals as following below.
Replace the cotton swab and repeat this cleaning two or three times.
(narrow type) (Part No.:J-2501-023-A) to be lightly wet. Use a force
(about 5 g) to make the objective lens in contact with the bottom
lightly, and clean the lens by spirals as following below.
Replace the cotton swab and repeat this cleaning two or three times.
NOTES ON CLEANING THE OBJECTIVE LENS
cotton swabs
objective lens
2-axis actuator
2-axis cover
slide base
surface of objective lens
General
Outputs
Line outputs (2)
Sub output
Power antenna relay
control lead
Power amplifier control
lead
Sub output
Power antenna relay
control lead
Power amplifier control
lead
Power requirements
12 V DC car battery
(negative ground)
(negative ground)
Dimensions
Approx. 178
×
100
×
173 mm
(w/h/d)
Mounting dimensions
Approx. 178
×
100
×
155 mm
(w/h/d)
Mass
Approx. 2.2 kg
Supplied accessories
Parts for installation and
connections (1 set)
Decoy cover (1)
connections (1 set)
Decoy cover (1)
Design and specifications are subject to change without
notice.
notice.
Notes:
Do not force to push the objective lens. Otherwise, the plate spring
supporting the objective lens will be bent, causing a deteriorated
RF waveform.
Never touch anything other than the objective lens. Otherwise, a
significant deterioration occurs in the RF waveform.
Do not force to push the objective lens. Otherwise, the plate spring
supporting the objective lens will be bent, causing a deteriorated
RF waveform.
Never touch anything other than the objective lens. Otherwise, a
significant deterioration occurs in the RF waveform.
– 3 –
TABLE OF CONTENTS
1. GENERAL
Location of Controls ............................................................... 4
Getting Started ........................................................................ 5
Setting the Clock .................................................................... 5
CD Player ............................................................................... 5
Cassette Player ....................................................................... 7
Radio ...................................................................................... 8
Other Functions .................................................................... 10
CD/MD unit .......................................................................... 11
TV/Video .............................................................................. 14
Connections .......................................................................... 16
Getting Started ........................................................................ 5
Setting the Clock .................................................................... 5
CD Player ............................................................................... 5
Cassette Player ....................................................................... 7
Radio ...................................................................................... 8
Other Functions .................................................................... 10
CD/MD unit .......................................................................... 11
TV/Video .............................................................................. 14
Connections .......................................................................... 16
2. DISASSEMBLY
2-1. Front Panel ....................................................................... 18
2-2. Control Board ................................................................... 18
2-3. CD Mechanism Block ...................................................... 19
2-4. Heat Sink .......................................................................... 19
2-5. CD Board ......................................................................... 20
2-6. Tape Mechanism Block .................................................... 20
2-7. Main Board ...................................................................... 21
2-8. Chassis (T) Assy ............................................................... 21
2-9. Lever (Release T) ............................................................. 22
2-10. Servo Board ...................................................................... 22
2-11. Roller Assy ....................................................................... 23
2-12. Chassis (OP) (O/S) Assy .................................................. 23
2-13. Optical Pick-up Block ...................................................... 24
2-2. Control Board ................................................................... 18
2-3. CD Mechanism Block ...................................................... 19
2-4. Heat Sink .......................................................................... 19
2-5. CD Board ......................................................................... 20
2-6. Tape Mechanism Block .................................................... 20
2-7. Main Board ...................................................................... 21
2-8. Chassis (T) Assy ............................................................... 21
2-9. Lever (Release T) ............................................................. 22
2-10. Servo Board ...................................................................... 22
2-11. Roller Assy ....................................................................... 23
2-12. Chassis (OP) (O/S) Assy .................................................. 23
2-13. Optical Pick-up Block ...................................................... 24
3. ASSEMBLY OF TAPE MECHANISM
Alignment of Rotary Switch ................................................. 25
Gear (LDG-E) ....................................................................... 25
Chassis (S) Assy ................................................................... 26
Lever (Mode) ........................................................................ 26
Lever (Pinch Selection) ........................................................ 27
Head Plate Assy .................................................................... 27
Lever (Pinch) Assy ............................................................... 28
Housing ................................................................................ 28
Arm (Suction) ....................................................................... 29
Lever (LDG-A)/(LDG-B) ..................................................... 29
Gear (LDG-FT) .................................................................... 30
Guide (C) .............................................................................. 30
Gear (LDG-E) ....................................................................... 25
Chassis (S) Assy ................................................................... 26
Lever (Mode) ........................................................................ 26
Lever (Pinch Selection) ........................................................ 27
Head Plate Assy .................................................................... 27
Lever (Pinch) Assy ............................................................... 28
Housing ................................................................................ 28
Arm (Suction) ....................................................................... 29
Lever (LDG-A)/(LDG-B) ..................................................... 29
Gear (LDG-FT) .................................................................... 30
Guide (C) .............................................................................. 30
4. MECHANICAL ADJUSTMENTS
.............................. 31
5. ELECTRICAL ADJUSTMENTS
Tape Section ......................................................................... 31
Tuner Section ........................................................................ 32
CD Section ........................................................................... 35
Tuner Section ........................................................................ 32
CD Section ........................................................................... 35
6. DIAGRAMS
6-1. IC Pin Descriptions .......................................................... 37
6-2. Block Diagram –CD Section– .......................................... 41
6-3. Block Diagram –Tape Section– ....................................... 43
6-4. Block Diagram –Main Section– ....................................... 45
6-5. Circuit Boards Location ................................................... 47
6-6. Printed Wiring Boards –CD Mechanism Section– ........... 48
6-7. Schematic Diagram –CD Mechanism Section– ............... 51
6-8. Printed Wiring Boards –CD Section– .............................. 56
6-9. Schematic Diagram –CD Section–................................... 59
6-10. Printed Wiring Boards –Main Section– ........................... 63
6-11. Schematic Diagram –Main Section– ................................ 67
6-12. Printed Wiring Board –Control Section– ......................... 72
6-13. Schematic Diagram –Control Section– ............................ 77
6-2. Block Diagram –CD Section– .......................................... 41
6-3. Block Diagram –Tape Section– ....................................... 43
6-4. Block Diagram –Main Section– ....................................... 45
6-5. Circuit Boards Location ................................................... 47
6-6. Printed Wiring Boards –CD Mechanism Section– ........... 48
6-7. Schematic Diagram –CD Mechanism Section– ............... 51
6-8. Printed Wiring Boards –CD Section– .............................. 56
6-9. Schematic Diagram –CD Section–................................... 59
6-10. Printed Wiring Boards –Main Section– ........................... 63
6-11. Schematic Diagram –Main Section– ................................ 67
6-12. Printed Wiring Board –Control Section– ......................... 72
6-13. Schematic Diagram –Control Section– ............................ 77
7. EXPLODED VIEWS
7-1. Cover Section ................................................................... 87
7-2. Front Panel Section .......................................................... 88
7-3. Chassis Section ................................................................ 89
7-4. CD Mechanism Section (1) .............................................. 90
7-5. CD Mechanism Section (2) .............................................. 91
7-6. CD Mechanism Section (3) .............................................. 92
7-7. Tape Mechanism Section (1) ............................................ 93
7-8. Tape Mechanism Section (2) ............................................ 94
7-2. Front Panel Section .......................................................... 88
7-3. Chassis Section ................................................................ 89
7-4. CD Mechanism Section (1) .............................................. 90
7-5. CD Mechanism Section (2) .............................................. 91
7-6. CD Mechanism Section (3) .............................................. 92
7-7. Tape Mechanism Section (1) ............................................ 93
7-8. Tape Mechanism Section (2) ............................................ 94
8. ELECTRICAL PARTS LIST
....................................
95
– 4 –
SECTION 1
GENERAL
This section extracted from
instruction manual.
instruction manual.