DAV-DX375, HCD-DX375 - Sony Audio Service Manual (repair manual)

dav-dx375, hcd-dx375 service manual
Model
DAV-DX375 HCD-DX375
Pages
104
Size
11.32 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
dav-dx375-hcd-dx375.pdf
Date

Read Sony DAV-DX375 / HCD-DX375 Service Manual online

SERVICE MANUAL
Sony Corporation
Audio Business Group
Published by Sony Techno Create Corporation
US Model
SUPER AUDIO CD/DVD RECEIVER
9-887-160-05
2007J16-1
© 2007.10
Ver. 1.4  2007.10
HCD-DX375
HCD-DX375 is the amplifier, DVD/CD and tuner
section in DAV-DX375.
SPECIFICATIONS
Model Name Using Similar Mechanism
HCD-DX255
Mechanism Type
CDM81C-DVBU101
Optical Pick-up Name
KHM-310CAB
This system incorporates with Dolby*
1
 Digital and Dolby Pro Logic (II)
adaptive matrix surround decoder and the DTS*
2
  Digital Surround
System.
*1 Manufactured under license from Dolby Laboratories.
“Dolby,” “Pro Logic,” and the double-D symbol are trademarks of
Dolby Laboratories.
*2 Manufactured under license from Digital Theater Systems, Inc.
“DTS” and “DTS Digital Surround” are trademarks of Digital
Theater Systems, Inc.
— Continued on next page —
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND 
TOTAL HARMONIC 
DISTORTION
(FTC Output Power):
FL/FR/SL/SR/C: 84 W/ch 
3 ohm at 170 - 20,000 Hz,
0.7 % THD 
SW: 160 W 1.5 ohm at 40 - 
170 Hz, 0.7 % THD
Amplifier section
Surround mode (reference) RMS output power, 10 % 
THD
Front: 143 W + 143 W 
(with SS-TS52)
Center*: 143 W
(with SS-CT51)
Surround*: 143 W + 143 
W
(with SS-TS51)
Subwoofer*: 285 W
(with SS-WS52B)
* Depending on the sound field settings and the source, 
there may be no sound output.
Inputs
TV, VCR (AUDIO IN)
Sensitivity: 450/250 mV
AUDIO IN
Sensitivity: 250/125 mV
Outputs (Analog)
Phones
Accepts low-and high-
impedance headphones.
Super Audio CD/DVD system
Laser
 Semiconductor 
laser
(Super Audio CD/DVD:
 
λ = 650 nm)
(CD: 
λ = 790 nm)
Emission duration: 
continuous
Signal format system
NTSC 
Harmonic distortion
Less than 0.03 %
Tuner section
System
PLL quartz-locked digital 
synthesizer system
FM tuner section
Tuning range 
87.5 – 108.0 MHz 
(100 kHz step)
Antenna (aerial)
FM wire antenna (aerial)
Antenna (aerial) terminals 75 ohms, unbalanced
Intermediate frequency
10.7 MHz
AM tuner section
Tuning range 
530 – 1,710 kHz (with the 
interval set at 10 kHz)
531 – 1,710 kHz (with the 
interval set at 9 kHz)
Antenna (aerial)
AM loop antenna (aerial)
Intermediate frequency
450 kHz
Video section
Outputs
VIDEO: 1 Vp-p 75 ohms
S VIDEO:
Y: 1 Vp-p 75 ohms
C: 0.286 Vp-p 75 ohms
COMPONENT:
Y: 1 Vp-p 75 ohms
P
B
/C
B
, P
R
/C
R
: 0.7 Vp-p 
75 ohms
HDMI OUT:
Type A (19 pin)
2
HCD-DX375
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
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
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.
Soldering irons using a temperature regulator should be set to
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 viscou-s (sticky, less prone to flow)
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.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 °C
during 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 radiation
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  PUBLISHED  BY  SONY.
SAFETY  CHECK-OUT
After correcting the original service problem, perform the following
safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE  TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples
of a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2 V AC range are suitable.  (See
Fig. A)
1.5 k
0.15 
µ
F
AC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
Fig. A.
Using an AC voltmeter to check AC leakage.
General
Power requirements 
120 V AC, 60 Hz
Power consumption
On: 160 W
Standby: 0.3 W (at the 
Power Saving mode) 
Dimensions (approx.)
430 
× 86 × 418 mm 
(17 
× 3 
1
/
4
 
× 16 
3
/
4
 inches) 
(w/h/d) incl. projecting 
parts
Mass (approx.)
5.2 kg (11 lb 8 oz)
Design and specifications are subject to change 
without notice.
3
HCD-DX375
TABLE OF CONTENTS
1.
SERVICING NOTE
...................................................
4
2.
GENERAL
................................................................... 11
3.
DISASSEMBLY
3-1.
Disassembly Flow ........................................................... 14
3-2.
Case, Front Panel Assy .................................................... 15
3-3.
FL Board, SW Board ....................................................... 16
3-4.
JACK Board, LED Board ................................................ 16
3-5.
DMB12 Board ................................................................. 17
3-6.
I/O Board, Tuner .............................................................. 18
3-7.
SPEAKER Board, D.C. Fan ............................................ 18
3-8.
MAIN Board .................................................................... 19
3-9.
POWER Board ................................................................ 20
3-10. DVD Mechanism Deck (CDM81C-DVBU101) ............. 21
3-11. TRAY .............................................................................. 22
3-12. MOTOR Board M761 (LD/ST Motor),
M762 (BU U/D Motor) ................................................... 22
3-13. BASE UNIT (DVBU101) ................................................ 23
3-14. Optical Pick-up (KHM-310CAB) ................................... 23
3-15. Gear (Sub Tray 1), Gear (Sub Tray 2) ............................. 24
3-16. Lever Assy ....................................................................... 24
3-17. Stocker Section ................................................................ 25
3-18. Cam (Stocker) .................................................................. 25
3-19. Gear (Stocker 3) .............................................................. 26
3-20. Rotary Encoder (MD) ...................................................... 26
3-21. Gear (BU2) ...................................................................... 27
4.
TEST MODE
............................................................... 28
5.
ELECTRICAL ADJUSTMENT
............................. 32
6.
DIAGRAMS
6-1.
Block Diagram  – RF Section – ....................................... 34
6-2.
Block Diagram  – AMP Section – ................................... 35
6-3.
Block Diagram  – AUDIO Section – ............................... 36
6-4.
Block Diagram  – VIDEO Section – ............................... 37
6-5.
Block Diagram  – POWER Section – .............................. 38
6-6.
Printed Wiring Board – DMB12 Board (Side A) – ......... 39
6-7.
Printed Wiring Board – DMB12 Board (Side B) – ......... 40
6-8.
Schematic Diagram  – DMB12 Board (1/7) – ................. 41
6-9.
Schematic Diagram  – DMB12 Board (2/7) – ................. 42
6-10. Schematic Diagram  – DMB12 Board (3/7) – ................. 43
6-11. Schematic Diagram  – DMB12 Board (4/7) – ................. 44
6-12. Schematic Diagram  – DMB12 Board (5/7) – ................. 45
6-13. Schematic Diagram  – DMB12 Board (6/7) – ................. 46
6-14. Schematic Diagram  – DMB12 Board (7/7) – ................. 47
6-15. Printed Wiring Board – MAIN Board (Side A) – ............ 48
6-16. Printed Wiring Board – MAIN Board (Side B) – ............ 49
6-17. Schematic Diagram  – MAIN Board (1/6) – ................... 50
6-18. Schematic Diagram  – MAIN Board (2/6) – ................... 51
6-19. Schematic Diagram  – MAIN Board (3/6) – ................... 52
6-20. Schematic Diagram  – MAIN Board (4/6) – ................... 53
6-21. Schematic Diagram  – MAIN Board (5/6) – ................... 54
6-22. Schematic Diagram  – MAIN Board (6/6) – ................... 55
6-23. Printed Wiring Board – I/O Board – ............................... 56
6-24. Schematic Diagram  – I/O Board – ................................. 57
6-25. Printed Wiring Boards – PANEL Section – ..................... 58
6-26. Schematic Diagram  – PANEL Section – ........................ 59
6-27. Printed Wiring Board – SPEAKER Board – ................... 60
6-28. Schematic Diagram – SPEAKER Board – ...................... 60
6-29. Printed Wiring Boards  – CD MECHANISM Section – . 61
6-30. Schematic Diagram  – CD MECHANISM Section – ..... 62
6-31. Printed Wiring Board – POWER Board – ....................... 63
6-32. Schematic Diagram  – POWER Board  – ........................ 64
7.
EXPLODED VIEWS
7-1.
Overall Section ................................................................ 78
7-2.
Front Panel Section ......................................................... 79
7-3.
Chassis Section ................................................................ 80
7-4.
DVD Mechanism Deck Section-1
(CDM81C-DVBU101) .................................................... 81
7-5.
DVD Mechanism Deck Section-2
(CDM81C-DVBU101) .................................................... 82
7-6.
DVD Mechanism Deck Section-3
(CDM81C-DVBU101) .................................................... 83
7-7.
Base Unit (DVBU101) .................................................... 84
8.
ELECTRICAL PARTS LIST
.................................. 85
Ver. 1.4
4
HCD-DX375
SECTION  1
SERVICING  NOTE
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
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 emission,
observe from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH
1. Open the cover and turn POWER on with no disc inserted.
2. Confirm that the following operation is performed while
observing the objecting lens.
1)
Confirm that laser beam is spread.
2)
Up and down motion of the objective lens. (3 times)
DISC TRAY  LOCK
The disc tray lock function for the antitheft of an demonstration
disc in the store is equipped.
Setting Procedure :
1. Press the  ?/1  button to turn the set on.
2. Press the [FUNCTION] button to set DVD function.
3. Insert a disc.
4. Press the  
x  
button and the  
 button simultaneously for five
seconds.
5. The message “LOCKED” is displayed and the tray is locked.
Releasing Procedure :
1. Press the  
x  
button and the  
 button simultaneously for five
seconds again.
2. The message “UNLOCKED” is displayed and the tray is
unlocked.
Note 1:
When “LOCKED” is displayed, the tray lock is not released by
turning power on/off with the  ?/1  button.
Note 2:
Incorrect operations may be performed if the test mode ia not
entered properly.
In this case, press the  ?/1  button to turn the power off, and
retry to enter the test mode.
Note 3:
If the disc tray does not open and the message “LOCKED”
appears, press the  x  button and the  A  button  simultaneously
for seconds or longer.
Then remove your fingers from the above stick and the button.
The message “UNLOCKED” appears for 2 seconds and the disc
tray opens.
Note on DMB12 board replacement
New part of EEP ROM (IC103, IC706) on the DMB12 board cannot be
used. Therefore, if the mounted DMB12 board (A-1148-813-A) is replaced,
exchange new EEP ROM (IC103, IC706) with that used before the
replacement.
When the self-diagnosis function is activated to 
prevent the system from malfunctioning, a 5-
character service number (e.g., C 13 50) with a 
combination of a letter and 4 digits appears on 
the screen and the front panel display. In this 
case, check the following table.
When displaying the version 
number on the screen
When you turn on the system, the version 
number [VER.X.XX] (X is a number) may 
appear on the screen. Although this is not a 
malfunction and for Sony service use only, 
normal system operation will not be possible. 
Turn off the system, and then turn on the system 
again to operate.
Self-diagnosis Function 
(When letters/numbers appear in the 
display)
First 3 
characters of 
the service 
number
Cause and/or corrective action
C 13
The disc is dirty.
,Clean the disc with a soft cloth 
C 31
The disc is not inserted correctly.
,Restart the system, then re-insert 
the disc correctly.
E XX
(xx is a number)
To prevent a malfunction, the 
system has performed the self-
diagnosis function.
,Contact your nearest Sony 
dealer or local authorized Sony 
service facility and give the 5-
character service number.
Example: E 61 10
C:13:50
VER.X.XX
Page of 104
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