DOWNLOAD Sony HCD-GN70V / MHC-GN70V Service Manual ↓ Size: 5.23 MB | Pages: 79 in PDF or view online for FREE

Model
HCD-GN70V MHC-GN70V
Pages
79
Size
5.23 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
hcd-gn70v-mhc-gn70v.pdf
Date

Sony HCD-GN70V / MHC-GN70V Service Manual ▷ View online

Model Name Using Similar Mechanism
NEW
CD
CD Mechanism Type
CDM74-30BD62
Section
Base Unit Name
BU-30BD62
Optical Pick-up Name
A-MAX.3
TAPE
Model Name Using Similar Mechanism
HCD-GN700/GX8800
Section
Tape Transport Mechanism Type
CWM43RR23
MiNi Hi-Fi COMPONENT SYSTEM
E Model
HCD-GN70V
Ver 1.0  2003.06
9-877-493-01
Sony Corporation
2003F02-1
Home Audio Company
C
 2003.06
Published by Sony Engineering Corporation
SPECIFICATIONS
HCD-GN70V is the amplifier, CD player, tape
deck and tuner section in MHC-GN70V.
– Continued on next page –
SERVICE MANUAL
Amplifier section
The following are measured at AC 127, 220, 240V 50/60 Hz
(Saudi Arabian model only)
The following are measured at AC 120, 220, 240V 50/60 Hz
(except for Saudi Arabian model)
DIN power output (rated)
160 + 160 watts
(6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference)
200 + 200 watts
(6 ohms at 1 kHz, 10% THD)
Inputs
GAME (VIDEO):
1 Vp-p, 75 ohms
(phono jack)
GAME (AUDIO):
Voltage 250 mV,
(phono jacks)
impedance 47 kilohms
MD/VIDEO (AUDIO) IN:
voltage 450 mV/250 mV,
(phono jacks)
impedance 47 kilohms
MIC:
sensitivity 1 mV,
(phone jack)
impedance 10 kilohms
Outputs
VIDEO OUT:
max. output level 1 Vp-p,
(phono jacks)
unbalanced, Sync.
negative load impedance
75 ohms
AUDIO OUT:
Voltage 250 mV,
(phono jacks)
impedance 47 kilohms
PHONES:
accepts headphones of
(stereo mini jack)
8 ohms or more
FRONT SPEAKER:
accepts impedance of 6 to 16 ohms
SURROUND SPEAKER:
accepts impedance of 24 ohms or more
VIDEO CD/CD/MP3 player section
System
Compact disc and digital audio system
Laser
Semiconductor laser
(
λ=795nm)
Emission duration: continuous
Frequency response
2 Hz – 20 kHz (
±0.5 dB)
Wave length
795 nm
Video colour system format
NTSC, PAL
Tape player section
Recording system
4-track 2-channel stereo
Frequency response
50 – 13,000 Hz (
±3 dB),
using Sony TYPE I tape
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
87.5 – 108.0 MHz
Antenna
FM lead antenna
Antenna terminals
75 ohm unbalanced
Intermediate frequency
10.7 MHz
HCD-GN70V
2
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.
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C dur-
ing 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.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
SAFETY-RELATED  COMPONENT  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  WHOSE  PART  NUMBERS  APPEAR  AS
SHOWN  IN  THIS  MANUAL  OR  IN  SUPPLEMENTS  PUB-
LISHED  BY  SONY.
This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER
PRODUCT MARKING is
located on the rear exterior.
AM tuner section
Saudi Arabian models:
531 – 1,602 kHz
(with the interval set at 9 kHz)
Other models:
531 – 1,602 kHz
(with the interval set at 9 kHz)
530 – 1,710 kHz
(with the interval set at 10 kHz)
Antenna
AM loop antenna
Antenna terminals
External antenna terminal
Intermediate frequency
450 kHz
General
Power requirements
Thai models:
220 V AC, 50/60 Hz
Saudi Arabian models:
120 - 127 V, 220 V or
230 - 240 V AC, 50/60 Hz
Adjustable with voltage selector
Other models:
120 V, 220 V or
230 - 240 V AC, 50/60 Hz
Adjustable with voltage selector
Power consumption
210 watts
Dimensions (w/h/d)
Approx. 280 x 360 x 386.5 mm
Mass :
Approx. 11.1 kg
Design and specifications are subject to change without notice.
The following caution label located inside th eapparatus.
HCD-GN70V
3
TABLE  OF  CONTENTS
1.
SERVICING NOTES
................................................
4
2.
GENERAL
Location of Controls .......................................................
5
3.
DISASSEMBLY
3-1. Case .................................................................................
8
3-2. Loading (Panel) ...............................................................
8
3-3. Front Panel Assy .............................................................
9
3-4. Tuner Pack, Sub Trans Board .........................................
9
3-5. CD Mechanism Deck ...................................................... 10
3-6. Game In Board, Tape Mechanism Deck ......................... 10
3-7. CD Switch Board, Display Board .................................. 11
3-8. Volume Board .................................................................. 11
3-9. Rear Panel ....................................................................... 12
3-10. Main Board ...................................................................... 12
3-11. Power Amp Board ........................................................... 13
3-12. Video board, SW Board, Driver Board .......................... 13
3-13. Base Unit ......................................................................... 14
3-14. Sensor Board ................................................................... 14
3-15. Motor (TB) Board ........................................................... 15
3-16. Motor (LD) Board ........................................................... 15
3-17. BD Board ......................................................................... 16
4.
TEST  MODE
.............................................................. 17
5.
MECHANICAL  ADJUSTMENTS
....................... 21
6.
ELECTRICAL  ADJUSTMENTS
Deck section .................................................................... 21
CD Section ...................................................................... 23
Video Section .................................................................. 24
7.
DIAGRAMS
7-1. Circuit Board Location ................................................... 26
7-2. Block Diagram  – CD Servo Section – ........................... 28
Block Diagram  – Tuner/Tape Deck Section – ............... 29
Block Diagram  – Main Section – .................................. 30
Block Diagram  – Display/Power Supply Section – ...... 31
7-3. Printed Wiring Board  – BD Board – ............................. 32
7-4. Schematic Diagram  – BD Board – ................................ 33
7-5. Printed Wiring Board  – Video Board – ......................... 34
7-6. Schematic Diagram  – Video Board – ............................ 35
7-7. Printed Wiring Board  – CD Mechanism Board – ......... 36
7-8. Schematic Diagram  – CD Mechanism Board – ............ 37
7-9. Printed Wiring Boards  – Main Board – ......................... 38
7-10. Schematic Diagram  – Main Board (1/3) – .................... 39
7-11. Schematic Diagram  – Main Board (2/3) – .................... 40
7-12. Schematic Diagram  – Main Board (3/3) – .................... 41
7-13. Printed Wiring Boards
– Game In, CD Switch Board – ...................................... 42
7-14. Schematic Diagram
– Game In, CD Switch Board – ...................................... 43
7-15. Printed Wiring Board  – Display Board – ...................... 44
7-16. Schematic Diagram  – Display Board – ......................... 45
7-17. Printed Wiring Board  – Power Amp Board – ................ 46
7-18. Schematic Diagram  – Power Amp Board – .................. 47
7-19. Printed Wiring Boards  – Trans Board – ........................ 48
7-20. Schematic Diagram  – Trans Board – ............................. 49
7-21. IC Block Diagram ........................................................... 50
7-22. IC Pin Function Description ........................................... 52
8.
EXPLODED  VIEWS
8-1. Case, Rear Panel Section ................................................ 59
8-2. Front Panel Section ......................................................... 60
8-3. Chassis Section ............................................................... 61
8-4. CD Mechanism Deck Section-1
(CDM74-30BD62) .......................................................... 62
8-5. CD Mechanism Deck Section-2
(CDM74-30BD62) .......................................................... 63
8-6. Base Unit Section (BU-30BD62) ................................... 64
9.
ELECTRICAL  PARTS  LIST
............................... 65
4
HCD-GN70V
SECTION  1
SERVICING  NOTES
NOTES  ON  HANDLING  THE  OPTICAL  PICK-UP
BLOCK  OR  BASE  UNIT
The laser diode in the optical pick-up block may suffer electro-
static 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
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.
LASER  DIODE  AND  FOCUS  SEARCH  OPERATION
CHECK
Carry out the “S curve check” in “CD section adjustment” and
check that the S curve waveforms is output three times.
• MODEL  IDENTIFICATION
– Back Panel –
MODEL
PART No.
SP model
4-246-198-0[]
E3, E15 models
4-246-198-4[]
TH model
4-246-198-5[]
MY model
4-246-198-6[]
EA model
4-246-198-7[]
PH model
4-246-198-8[]
Abbreviation
E3
: 240 V AC Area in E model
E15
: Iran model
EA
: Saudi Arabia model
SP
: Singapore model
MY
: Malaysia model
TH
: Thai model
PH
: Philippines model
PART No.
Page of 79
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Sony HCD-GN70V / MHC-GN70V Service Manual ▷ Download

  • DOWNLOAD Sony HCD-GN70V / MHC-GN70V Service Manual ↓ Size: 5.23 MB | Pages: 79 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sony HCD-GN70V / MHC-GN70V in PDF for free, which will help you to disassemble, recover, fix and repair Sony HCD-GN70V / MHC-GN70V Audio. Information contained in Sony HCD-GN70V / MHC-GN70V Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.