Sony WX-GT77UI / WX-GT78UI / WX-GT78UIM Service Manual ▷ View online
SERVICE MANUAL
Sony Corporation
Audio&Video Business Group
Published by Sony Techno Create Corporation
General
Output:
Audio outputs terminal (front/rear)
Subwoofer output terminal (mono)
Power antenna (aerial) relay control terminal
Power
Audio outputs terminal (front/rear)
Subwoofer output terminal (mono)
Power antenna (aerial) relay control terminal
Power
amplifi er control terminal
Inputs:
Remote controller input terminal
Antenna (aerial) input terminal
Telephone ATT control terminal
Illumination control terminal
BUS control input terminal
BUS audio input terminal
AUX input jack (stereo mini jack)
USB signal input terminal
Remote controller input terminal
Antenna (aerial) input terminal
Telephone ATT control terminal
Illumination control terminal
BUS control input terminal
BUS audio input terminal
AUX input jack (stereo mini jack)
USB signal input terminal
WX-GT77UI/GT78UI/
GT78UIM
FM/AM 2DIN COMPACT DISC PLAYER
9-889-412-02
2009D04-1
©
2009.04
US Model
WX-GT77UI
E Model
WX-GT78UI
Indian Model
WX-GT77UI/GT78UIM
Saudi Arabia Model
WX-GT77UI
Ver. 1.1 2009.04
SPECIFICATIONS
CD Player section
Signal-to-noise ratio: 120 dB
Frequency response: 10 – 20,000 Hz
Wow and fl utter: Below measurable limit
Frequency response: 10 – 20,000 Hz
Wow and fl utter: Below measurable limit
Tuner section
FM
Tuning range:
Except US model:
87.5 – 108.0 MHz
US
Tuning range:
Except US model:
87.5 – 108.0 MHz
US
model:
87.5 – 107.9 MHz
Antenna (aerial) terminal:
External antenna (aerial) connector
Intermediate frequency: 150 kHz
Usable sensitivity: 10 dBf
Selectivity: 75 dB at 400 kHz
Signal-to-noise ratio: 70 dB (mono)
Separation: 40 dB at 1 kHz
Frequency response: 20 – 15,000 Hz
Antenna (aerial) terminal:
External antenna (aerial) connector
Intermediate frequency: 150 kHz
Usable sensitivity: 10 dBf
Selectivity: 75 dB at 400 kHz
Signal-to-noise ratio: 70 dB (mono)
Separation: 40 dB at 1 kHz
Frequency response: 20 – 15,000 Hz
AM
Tuning range:
Except US model:
531 – 1,602 kHz
US
Tuning range:
Except US model:
531 – 1,602 kHz
US
model:
530 – 1,710 kHz
Antenna (aerial) terminal:
External antenna (aerial) connector
Intermediate frequency: 25 kHz
Sensitivity: 26
Antenna (aerial) terminal:
External antenna (aerial) connector
Intermediate frequency: 25 kHz
Sensitivity: 26
μV
USB Player section
Interface: USB (Full-speed)
Maximum current: 500mA
Maximum current: 500mA
Power amplifi er section
Outputs: Speaker outputs (sure seal connectors)
Speaker impedance: 4 – 8 ohms
Maximum power output: 52 W × 4 (at 4 ohms)
Speaker impedance: 4 – 8 ohms
Maximum power output: 52 W × 4 (at 4 ohms)
Model Name Using Similar Mechanism
CDX-M60UI/MR60UI
CD Drive Mechanism Type
MG-101Z-188//Q
Optical Pick-up Name
DAX-25A
• The tuner and CD sections have no adjustments.
AUDIO POWER SPECIFICATIONS
(US model)
CEA2006 Standard
Power Output: 17 Watts RMS × 4 at
4 Ohms <1 % THD + N
SN Ratio: 82 dBA
(reference: 1 Watt into 4 Ohms)
(US model)
CEA2006 Standard
Power Output: 17 Watts RMS × 4 at
4 Ohms <1 % THD + N
SN Ratio: 82 dBA
(reference: 1 Watt into 4 Ohms)
Photo: WX-GT78UI
– Continued on next page –
WX-GT77UI/GT78UI/GT78UIM
2
NOTES ON CHIP COMPONENT REPLACEMENT
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
TEST DISCS
Please use the following test discs for the check on the CD section.
Please use the following test discs for the check on the CD section.
YDES-18 (Part No. 3-702-101-01)
PATD-012 (Part No. 4-225-203-01)
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostat-
ic 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 fl exible board is easily damaged and should be handled with
care.
ic 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 fl exible 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 refl ective 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.
The laser beam on this model is concentrated so as to be focused
on the disc refl ective 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.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specifi ed herein may result in hazardous radia-
tion exposure.
Use of controls or adjustments or performance of procedures
other than those specifi ed herein may result in hazardous radia-
tion exposure.
If the optical pick-up block is defective, please replace the whole
optical pick-up block.
Never turn the semi-fi xed resistor located at the side of optical
pick-up block.
optical pick-up block.
Never turn the semi-fi xed resistor located at the side of optical
pick-up block.
optical pick-up
semi-fixed resistor
Tone controls:
Low: ±10 dB at 60 Hz (XPLOD)
Mid: ±10 dB at 1 kHz (XPLOD)
High: ±10 dB at 10 kHz (XPLOD)
Power requirements: 12 V DC Car battery
(negative ground (earth))
Dimensions: Approx. 178 × 100 × 185 mm
(7
Low: ±10 dB at 60 Hz (XPLOD)
Mid: ±10 dB at 1 kHz (XPLOD)
High: ±10 dB at 10 kHz (XPLOD)
Power requirements: 12 V DC Car battery
(negative ground (earth))
Dimensions: Approx. 178 × 100 × 185 mm
(7
1
/
8
× 4 × 7
3
/
8
in.) (w/h/d)
Mounting dimensions: Approx. 178 × 100 × 163 mm
(7
(7
1
/
8
× 4 × 6
1
/
2
in.) (w/h/d)
Mass: Approx. 1.9 kg (4 lb 4 oz.)
Supplied accessories:
Card remote commander: RM-X151
Parts for installation and connections (1 set)
Supplied accessories:
Card remote commander: RM-X151
Parts for installation and connections (1 set)
Design and specifi cations are subject to change
without notice.
without notice.
SAFETY-RELATED COMPONET WARNING!
COMPONENTS IDENTIFIED BY MARK 0 OR 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
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.
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
Ver. 1.1
WX-GT77UI/GT78UI/GT78UIM
3
Type of disc
Label on the disc
CD-DA
MP3
WMA
AAC
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 °C higher
• Unleaded solder melts at a temperature about 40 °C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
• Strong
viscosity
Unleaded solder is more viscous (sticky, less prone to fl ow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
also be added to ordinary solder.
• CD Play back
This unit can play CD-DA (also containing CD TEXT) and
CD-R/CD-RW (MP3/WMA/AAC fi les).
CD-R/CD-RW (MP3/WMA/AAC fi les).
This compact disc player is classifi ed as a CLASS 1 LASER
product. The CLASS 1 LASER PRODUCT label is located on the
exterior.
product. The CLASS 1 LASER PRODUCT label is located on the
exterior.
This label is located on the bottom of the chassis.
1.
SERVICE NOTES
................................................... 4
2. GENERAL
Location of Controls ....................................................... 5
Connections
....................................................................
6
3. DISASSEMBLY
3-1. Front Panel Assy ............................................................ 7
3-2. Sub Panel Assy ............................................................... 8
3-3. CD Mechanism Block ..................................................... 8
3-4. Main Board ..................................................................... 9
3-5. Servo
3-2. Sub Panel Assy ............................................................... 8
3-3. CD Mechanism Block ..................................................... 8
3-4. Main Board ..................................................................... 9
3-5. Servo
Board
.................................................................... 9
3-6. Chassis (T) Sub Assy ...................................................... 10
3-7. Roller Arm Assy .............................................................. 10
3-8. Chassis
3-7. Roller Arm Assy .............................................................. 10
3-8. Chassis
(OP)
Assy
........................................................... 11
3-9. Chucking Arm Sub Assy ................................................. 11
3-10. Sled Motor Assy .............................................................. 12
3-11. Optical Pick-up Section .................................................. 13
3-12. Optical Pick-up ............................................................... 13
3-10. Sled Motor Assy .............................................................. 12
3-11. Optical Pick-up Section .................................................. 13
3-12. Optical Pick-up ............................................................... 13
4. DIAGRAMS
4-1. Block Diagram –Main Section– ..................................... 15
4-2. Block Diagram –Display Section– ................................. 16
4-3. Printed Wiring Board –Main Section– ............................ 18
4-4. Schematic Diagram –Main Section (1/3)– ...................... 19
4-5. Schematic Diagram –Main Section (2/3)– ...................... 20
4-6. Schematic Diagram –Main Section (3/3)– ...................... 21
4-7. Printed Wiring Board –Sub Section– .............................. 22
4-8. Schematic Diagram –Sub Section– ................................. 23
4-9. Printed Wiring Board –Key Section (1/2)– ..................... 24
4-10. Printed Wiring Board –Key Section (2/2)– ..................... 25
4-11. Schematic Diagram –Key Section– ................................ 26
4-2. Block Diagram –Display Section– ................................. 16
4-3. Printed Wiring Board –Main Section– ............................ 18
4-4. Schematic Diagram –Main Section (1/3)– ...................... 19
4-5. Schematic Diagram –Main Section (2/3)– ...................... 20
4-6. Schematic Diagram –Main Section (3/3)– ...................... 21
4-7. Printed Wiring Board –Sub Section– .............................. 22
4-8. Schematic Diagram –Sub Section– ................................. 23
4-9. Printed Wiring Board –Key Section (1/2)– ..................... 24
4-10. Printed Wiring Board –Key Section (2/2)– ..................... 25
4-11. Schematic Diagram –Key Section– ................................ 26
5.
EXPLODED VIEWS
5-1. Sub
Panel
Section
........................................................... 33
5-2. Front Panel Section ......................................................... 34
5-3. Main Board Section ........................................................ 35
5-4. CD Mechanism Section (MG-101Z-188//Q) .................. 36
5-3. Main Board Section ........................................................ 35
5-4. CD Mechanism Section (MG-101Z-188//Q) .................. 36
6.
ELECTRICAL PARTS LIST
.............................. 37
TABLE OF CONTENTS
Ver. 1.1
WX-GT77UI/GT78UI/GT78UIM
4
SECTION 1
SERVICE NOTES
EXTENSION CABLE AND SERVICE POSITION
When repairing or servicing this set, connect the jig (extension
cable) as shown below.
When repairing or servicing this set, connect the jig (extension
cable) as shown below.
• Connect the MAIN board (CN201) and the SERVO board
(CN401) with the extension cable (Part No. J-2502-076-1).
NOTE FOR REPLACEMENT OF THE SERVO BOARD
When repairing, the complete SERVO board (Part No. A-1554-
409-A) should be replaced since any parts in the SERVO board
cannot be repaired.
When repairing, the complete SERVO board (Part No. A-1554-
409-A) should be replaced since any parts in the SERVO board
cannot be repaired.
SERVO BOARD
CN401
CN401
J-2502-076-1
MAIN BOARD
CN201
CN201