DAEWOO DHC-XD350 Service Manual
DHC-XD350
Digital Home Cinema System
1. SAFETY PRECAUTIONS......................................................3/4
2. SPECIFICATIONS....................................................................5
3. LOCATION OF USERS CONTROLS....................................6/8
-. FRONT PANEL.
-. REAR PANEL.
-. DISPLAY.
-. REMOTE CONTROLLER.
4. CONNECTING TO EQUIPMENT.........................................9/11
-. CONNECTING TO TV.
-. CONNECTING TO AUDIO & VIDEO.
-. CONNECTING TO SPEAKER.
-. CONNECTING TO RECORDING EQUIPMENT.
5. TROUBLE SHOOTING GUIDE.........................................12/19
6. DVD PROGRAM DOWNLOAD METHOD.............................20
7. WAVEFORMS OF MAJOR CHECK POINT.....................21/22
-. AUDIO OUT SIGNAL WAVEFORM.
-. DAC OUTPUT SIGNAL WAVEFORM.
-. OPTICAL OUTPUT AUDIO DATA SIGNALFORM.
-. L/R CLOCK DATA WAVEFORM DURING NORMAL PLAY.
-. SERIAL DATA OUTPUT WAVEFORM DURING NORMAL PLAY.
-. Cr OUTPUT DATA WAVEFORM IN COMPONENT OUTPUT.
-. Cb OUTPUT DATA WAVEFORM IN COMPONENT OUTPUT.
-. Y OUTPUT DATA WAVEFORM IN COMPONENT OUTPUT.
8. INTERNAL BLOCK DIAGRAM OF ICs............................23/30
9. BLOCK DIAGRAM............................................................31/33
10. WIRING DIAGRAM...............................................................34
11. SCHEMATIC DIAGRAM.................................................35/41
- AM SCHEMATIC DIAGRAM.
-. FRONT SCHEMATIC DIAGRAM.
-. DDX SCHEMATIC DIAGRAM.
-. IO SCHEMATIC DIAGRAM.
-. MPEG DECODER SCHEMATIC DIAGRAM.
-. MPEG OUTPUT SCHEMATIC DIAGRAM.
-. REGULATOR SCHEMATIC DIAGRAM.
12. PRINTED CIRCUIT DIAGRAM.......................................42/48
-. FRONT PCB.
1) TOP VIEW.
2) BOTTOM VIEW.
-. IO PCB.
1) TOP VIEW.
2) BOTTOM VIEW.
-. MPEG PCB.
1) TOP VIEW.
2) BOTTOM VIEW.
-. MAIN PCB.
1) TOP VIEW.
2) BOTTOM VIEW.
-. REGULATOR PCB.
13. MECHANISM........................................................................49
14. EXPLODED VIEW...........................................................50/52
-. MECHANICAL EXPLODED VIEW
-. MECHANICAL PARTS LIST
-. DISASSEMBLY VIEW
15. ELECTRICAL PARTS LIST............................................53/57
-. ELECTRICAL PARTS LIST
Contents
2
DIGITAL HOME CINEMA SYSTEM
DHC-XD350
1. Safety Precautions
WARNING
: TO PREVENT FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE
THIS APPLIANCE TO RAIN OR MOISTURE.
CAUTION :
TO REDUCE THE RISK IF ELECTRIC SHOCK, DO NOT
REMOVE COVER (OR BACK). NO USER SERVICEABLE PARTS
INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
THIS SYMBOL IS INTENDED TO ALERT THE USER TO THE
PRESENCE OF UNINSULTED "DANGEROUS VOLTAGE"
WITHIN THE PRODUCT'S ENCLOSURE THAT MAY BE
SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF
ELECTRIC SHOCK TO PERSONS.
THIS SYMBOL IS INTENDED TO ALERT THE USER TO THE
PRESENCE OF IMPORTANT OPERATING AND MAINTENANCE
(SERVICING) INSTRUCTIONS IN THE LITERATURE
ACCOMPANYING THE APPLIANCE.
CAUTION
TO PREVENT ELECTRIC SHOCK, DO NOT USE THIS POLARIZED AC
PLUG WITH AN EXTENSION CORD, RECEPTACLE OR OTHER OUTLET
UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE
EXPOSURE.
LASER SAFETY
THIS UNIT EMPLOYS A LASER. ONLY QUALIFIED SERVICE PERSONNEL
SHOULD REMOVE THE COVER OR ATTEMPT TO SERVICE THIS DEVICE
DUE TO POSSIBLE EYE INJURY.
CAUTION :
USE OF ANY CONTROLS, ADJUSTMENTS, OR PROCEDURES
OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS
RADIATION EXPOSURE.
CAUTION :
TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF
PLUG TO WIDE SLOT, FULLY INSERT.
ATTENTION :
POUR EVITER LES CHOCS ELECTRIQUES, INTRODUIRE
LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE CORRESPONDANTE DE LA PRISE ET POUSSER JUSQU'AU FOND.
Important Safety Instructions
- All the safety and operating instructions should be read before
the appliance is operated.
- The safety and operating instructions should be retained for
future reference.
- All warnings on the appliance and in the operating instructions
should be adhered to.
- All operating and use instructions should be followed.
1. Water and Moisture - The appliance should not be used near
water - for example, near a bathtub, washbowl, kitchen sink,
laundry tub, in a wet basement, or near a swimming pool,
and the like.
2. Carts and Stands - The appliance
should be used only with a cart or
stand that is recommended by th
manufacturer.
3. An appliance and cart combination
should be moved with care. Quick
stops, excessive force, and uneven
surfaces may cause the appliance
and cart combination to overturn.
4. Wall or Ceiling Mounting - The appli-
ance should be mounted to a wall or
ceiling only as recommended by the manufacturer.
5. Ventilation - The appliance should be situated so that its
location or position does not interfere with its proper
ventilation. For example, the appliance should not be situated
on a bed, sofa, rug, or similar surface that may block the
ventilation openings; or, placed in a built-in installation, such
as a bookcase or cabinet that may impede the flow of air
through the ventilation openings.
6. Heat - The appliance should be situated away from heat
sources such as radiators, heat registers, stoves, or other
appliances (including amplifiers) that produce heat.
7. Power Sources - The appliance should be connected to a
power supply only of the type described in the operating
instructions or as marked on the appliance.
8. Grounding or Polarization - The precautions that should be
taken so that the grounding or polarization means of an
appliance is not defeated.
9. Power - Cord Protection - Power-supply cords should be
routed so that they are not likely to be walked on or pinched
by items placed upon or against them, paying particular
attention to cords at plugs, convenience receptacles, and the
point where they exit from the appliance.
10.Protective Attachment Plug - If the appliance is equipped with
an attachment plug having overload protection. This is a
safety feature. See Instruction Manual for replacement or
resetting of protective device. If replacement of the plug is
required, be sure the service technician has used a
replacement plug specified by the manufacturer that has the
same overload protection as the original plug.
11.Cleaning - The appliance should be cleaned only as
recommended by the manufacturer.
12.Power Lines - An outdoor antenna should be located away
from power lines.
CAUTION
RISK OF ELECTRIC SHOCKS
DO NOT OPEN
PORTABLE CART
Figure 2
3
1. Safety Precautions
13.Outdoor Antenna Grounding - If an outside antenna is
connected to the receiver be sure the antenna system is
grounded so as to provide some protection against voltage
surges and built-up static charges. Article 810 of the National
Electrical Code, ANSI/NFPA 70, provides information with
regard to proper grounding of the mast and supporting
structure, grounding of the lead-in wire to an antenna-dis
charge unit, size of grounding conductors,location of antennadischarge unit, connection to grounding electrodes and
requirements for the grounding electrode. See Figure 1.
14.Non-use Periods - The power cord of the appliance should be
unplugged from the outlet when left unused for a long period
of time.
15.Object and Liquid Entry - Care should be taken so that objects
do not fall and liquids are not spilled into the enclosure through
openings.
16.Damage Requiring Service - The appliance should be
serviced by qualified service personnel when:
a) The power-supply cord or the plug has been damaged; or
b) Objects have fallen, or liquid has been spilled into the
appliance; or
c) The appliance has been exposed to rain; or
d) The appliance does not appear to operate normally or
exhibits a marked change in performance; or
e) The appliance has been dropped, or the enclosure
damaged.
17.Servicing - The user should not attempt to service the
appliance beyond that described in the operating instructions.
All other servicing should be referred to qualified service
personnel.
ANTENNA DISCHARGE UNIT
(NEC SECTION 810-20)
ANTENNA LEAD
IN WIRE
POWER SERVICE GROUNDING
ELECTRODE SYSTEM
(NEC ART 250 PART H)
GROUND CLAMP
ELECTRIC
SERVICE
EQUIPMENT
GROUNDING CONDUCTORS
(NEC SECTION 810-21)
GROUND CLAMPS
EXAMPLE OF ANTENNA
GROUNDING
NEC - NATIONAL ELECTRICAL CODE
4
2. Specifications
DHC-XD350
POWER OUTPUT 1% THD(DIN)
TOTAL HARMONIC DISTORTION
S/N RATIO DOLBY
FREQUENCY RESPONSE LARGE
(Dolby Digital) SMALL
FM Tuner Section
(FM ANT Impedance : 75 ohms)
Power supply
Voltage ( Option )
AC 110V or 120V or 127V or
220V or 230V or 240V (50/60Hz)
Power consumption Standby 2Watt
Operating 80Watt
Dimensions (W x D x H) / Weight
360 x 380 x 70mm/ 6.7 kg
POWER OUTPUT at 1% THD(DIN)
THD(Total Harmonic Distortion)
Input Sen. / Impedance @ 1KHz, 47K ohms
Output Level/Impedance @ 1KHz
Frequency Response(Analogue)
S/N Ratio IHF-A Weighted
Subwoofer Turnover Frequency
Channel Separation
Crosstalk
At 1KHz, 8 ohms
At 1KHz, 1W
VIDEO, TV/AUX
Video Rec
at 1W : TV/AUX -3dB
TV/AUX
TV/AUX:1KHz
VIDEO -->TV/AUX
TV/AUX--> VIDEO
30W
0.1%
200mV¡30mV/47K
200mV¡30mV/2.2K
20Hz~20KHz
70dB
¡´
120Hz
65dB
65dB
65dB
Front Amp. Section
Rear Amp Section
Center Amp Section
Video Section
Input Sen./Impedance
Output Level/Impedance
Frequency Response
Crosstalk
S/N Ratio
Composite Video(Video)
Composite 75 ohm
S-Video(Y/C) 75 ohm(DVD only)
Component Out(Y/ Cb/ Cr):Option
Ref 500KHz
@1MHz
DVD
1Vp-p/75 ohm
1Vp-p/75 ohm
1Vp-p/ 0.286Vp-p
1Vp-p/0.7Vp-p/0.7Vp-p
45dB
60dB
¡
0.5 dB
¡
0.5 dB
¡
0.5 dB
¡
0.5 dB
5Hz~5.7MHz
40dB
POWER OUTPUT at 1% THD(DIN)
TOTAL HARMONIC DISTORTION
S/N RATIO, IHF-A FILTER
FRE. RESPONSE LARGE
DOLBY MODE SMALL
At 1KHz, 8 ohms
At 1KHz, 1W
10W
1W
1W
30W
0.1%
70dB
20Hz~20KHz
135Hz~18KHz
At 1KHz, 8 ohms
At 1KHz, 1W
10W
1W
1W
30W
0.1%
70dB
20Hz~20KHz
135Hz~18KHz
Tuning Range
Scanning
Frequency Interval
Usable Sensitivity,
75 ohms
S/N Ratio @1mV
IHF-A FILTER
USA Version
Europe Version
USA Version
Europe Version
S/N=30dB,USA Version
S/N=26dB,Europe Version
Mono USA Version
Mono Europe Version
Stereo USA Version
Stereo Europe Version
87.5~108.0MHz
87.5~108.0MHz
100KHz
50KHz
2uV(17.2dBf)
3uV(20.8dBf)
70dB
70dB
65dB
63dB
Subwoofer Section
POWER OUTPUT at 10% THD
FREQUENCY RESPONSE
S/N RATIO, IHF-A Weight
At 100Hz, 8 ohms
1W
30W
20Hz~150Hz
60dB
5
PLAY
DIGITAL HOME CINEMA SYSTEM
6
DHC-XD350
DIGITAL HOME CINEMA SYSTEM DHC-XD350
VOL.
DOWN UP
OPEN/CLOSE PLAY STOP PREV
SKIP
NEXT FUNCTION
ON/OFF
POWER
PHONES
Front panel
1. POWER ON/OFF switch
2. DVD/VIDEO CD/MP3 CD/audio CD disc tray
3. Remote Control Sensor
4. Display
5. MASTER VOLUME control
6. STANDBY indicator
7. STANDBY/ON button
8. OPEN/CLOSE ( ) button
9. PLAY ( ) button
10. STOP ( ) button
11. PRE ( ) button
12. NEXT ( ) button
13. FUNCTION button
14. PHONES jack
3. Location of Users Controls
DHC-XD350
-. Rear Panel
-. Display
1. SPEAKER CONFIGURATION indicator
2. TITLE indicator
3. PRESET indicator
4. CHAPTER indicator
5. TRACK indicator
6. FILE indicator
7. SUB indicator
8. DIR indicator
9. TOTAL indicator
10. REMAIN indicator
11. SLEEP indicator
12. SOURCE indicator
13. PROLOGIC indicator
14. DOLBY DIGITAL indicator
15. PLAY indicator
16. PAUSE indicator
17. DTS indicator
18. DSP indicator
19. PCM indicator
20. PBC(Playback Control) indicator
21. RDS indicator
22. TA/TP indicator
23. STEREO indicator
24. MUTE indicator
25. RANDOM indicator
26. REPEAT indicator
27. INTRO indicator
7
1. COMPONENT VIDEO OUTPUT Y/Cb/Cr jacks
or SCART jack(Optional)
2. S VIDEO MONITOR OUT jack
3. AUX IN jacks
4. VIDEO (IN) jack
5. VIDEO (OUT) jack
6. DIGITAL OUTPUT jack
7. CENTER SPEAKER connector
8. FRONT SPEAKER connector
9. REAR SPEAKER connector
10. Power cord
11. FM ANTENNA connector
12. SUBWOOFER output jack
13. MONITOR OUT jack
14. WOOFER connector
8
3. Location of Users Controls
DHC-XD350
-. Remote Controller
1. STANDBY/ON button
2. OPEN/CLOSE button
3. MUTE button
4. INPUT SELECTOR: DVD button
5. INPUT SELECTOR: TUNER button
6. INPUT SELECTOR: VIDEO, TV/AUX button
7. FAST REVERSE(FR) ( ) button
8. SKIP PREV ( ) button
9. SPEAKER SETUP button
10. CH LEVEL button
11. PLAY ( ) button
12. STOP( ) button
13. MENU/RETURN button
14. PAUSE/STEP button
15. Number buttons
16. DISPLAY/FM MODE button
17. TEST TONE button
18. SUBTITLE button
19. SLOW button
20. A-B REPEAT button
21. ANGLE button
22. RANDOM button
23. DIGEST/RDS MODE button
24. MPX/PTY SEARCH button
25. SLEEP button
26. FAST FORWARD(FF) ( ) button
27. SKIP NEXT ( ) button
28. MOVE /ENTER buttons
29. SURROUND MODE button
30. TITLE button
31. VOLUME buttons
32. SET-UP button
33. GO TO/AUTO MEMORY button
34. DELAY TIME button
35. AUDIO button
36. ZOOM button
37. REPEAT button
38. PBC button
/ / /
/
4. Connecting to Equipment
DHC-XD350
-. Connecting to TV
9
If the TV or monitor is equipped with an S video
input, make the S video connection in addition to
the normal video connection. The S video
connection will provide higher quality picture
playback.
for America version:
optional
21-Pin SCART Cable(not included) to 21-pin
SCART input terminal on TV
SCART Specification :
Composite and Component Video output(DVD,
Video) Audio L/R Output(DVD only)
4. Connecting to Equipment
-. Connecting to AUDIO & VIDEO
10
DHC-XD350
4. Connecting to Equipment
-. Connecting to Speaker
-. Connecting to Recording Equipment
11
DHC-XD350
Before connecting
Refer also to the instruction manuals of the speakers.
This machine is designed to reproduce optimum sound quality when speakers with the specified impedance below are
connected.Please check the following information and choose speakers with appropriate impedance for the connections.
Front speakers / Center speaker / Surround Speakers : 8 ohms min. per speaker
Subwoofer speaker : 8 ohm min
Surround speakers
Surround speakers
Center speaker
Woofer speaker
Front speakers
Left ch.
Front speakers
Right ch.
Left ch.
Right ch.
To prevent damage to circuits, never shortcircuit the positive (+) and negative
(-) speaker wires.
Do not connect the speaker cable to the L
and R connectors at the same time and do
not connect more than one speaker to the
same speaker connectors.
RED BLUE
GREEN
GRAY
ORANGE
BROWN
5. Trouble Shooting Guide
DHC-XD350
12
1. Basic Operating
Is STANDBY LED on?
Push power on.
Is POWER on?
Does initial read work
Turn Power on.
Does it play?
Does it output audio?
OK
Yes
Yes
Yes
Yes
Yes
Yes
Check AUDIO circuit.
No
Check tracking SERVO
circuit.
No
Check LASER circuit.
Check focus circuit.
Check disc.
Check protect circuit.
No
Check power supply circuit.
No
Check POWER SUPPLY
circuit.
Check connection
CN703, WC700.
No
2. Front Micom Circuit
Replace IC703
Yes
Check if IC703
Pin24, 98
is High(+5.0V) ?
Check +5.0V line.
Check if IC703
Pin18
is High ?
Check Power down line.
Check if IC703
Pin6, 7, 8
is High ?
Yes
Check Protection circuit.
No
No
No
Yes
Yes
1
Does DVD appear
at VFD ?
Push power on.
Does loading appear
at VFD ?
Yes
Does no DISC or
time appear at VFD ?
Yes
Check if DVD an Audio
Micom Interface is OK.
Yes
Check from Micom
to DVD Interface
Check Power
Check Loader.
Check MPEG PCB
Yes
Check Power Supply circuit
No
No
No
Check power
supply circuit
of Regulator PCB
Yes
Refer to Power Supply
Circuit.
Check Oscillator of
XC700
Yes
Replace XC700
Check if IC703 Pin5
is work ?
Yes
Check DVD Reset control
Check if
Connector CW704 Pin1
to 6 are work ?
Yes
No
No
No
No
No
1
Check connector
WC701 if it normaly?
Check MPEG PCB
Yes
No
Recheck it
-. Audio Part
13
5. Trouble Shooting Guide
DHC-XD350
Check if the
POWER PART of the
FRONT is OK.
Check if the
REMOCON waveform of
the IC703 PIN(31).
Refer to MICOM circuit.
Refer to POWER SUPPLY
circuit.
Check if the IC702
PIN(1) is OK.
Replace IC702. Check RMC circuit.
Yes
Yes
No
No
No
Yes
1
LED ON
Push power on.
Yes
LED OFF
Yes
Yes
Check if ALL
BUTTONS are OK.
Check if the
FRONT POWER is OK.
Yes
Check if the IC703
OSC PIN(22) waveform is OK.
Yes
Check if the IC703
PIN (24) (98) is OK.
Check if POWER PART
of the FRONT is OK.
Replace XD700.
Check if the
VOLUME
is OK.
Check if the
HEADPHONE is OK?
Check if the
REMOCON is OK.
Yes
Yes
Yes
Yes
Yes
Check if the CN703
is OK.
Check if the FL700 PINS
are OK.
Yes
STANDBY ON
No
Yes
Re connect it.
Refer to POWER SW PCB
Refer to POWER SUPPLY
circuit.
CN703 PIN3: +5.6V
PIN8: -30V
Refer to POWER
SUPPLY circuit.
Refer POWER SUPPLY
circuit.
Check IC703
PIN(98) (99) (100) OK.
Refer to MICOM circuit.
Refer to KEY-IN line.
Check PATTERN and
RESOLDING.
No
No
No
No
No
Yes
Yes
No
No
Yes
No
Check if the POWER
is OK.
Check if the J700
PIN(4) is High.
Check if
HEADPHONE JACK is
OK.
Check MAIN PCB.
Check J700 circuit.
Replace H/P JACK.
Refer to Power Supply
circuit.
No
No
No
No
Yes
Yes
Yes
Check if POWER PART
of the FRONT is OK.
Check if IC703
PIN(29) (30) waveform
OK.
Refer to MICOM circuit.
Refer to Power Supply
circuit.
Check
VR700, HR718, HR719
OK.
Replace
VR700, HR718, HR719.
No
No
No
Yes
Yes
No
Refer to MICOM circuit.
Yes
No
No
1
Does Initial work? No
Front PCB OK
-. Front Circuit
14
5. Trouble Shooting Guide
-. Audio Part
Check if the IC202
PIN 23,24, 27, 28, 29,
30, 33, 34 and IC201
PIN 27, 28, 33, 34
waveform is OK.
Check if the J801
waveform is OK.
OK
Check if the IC201, 202
PIN 14 is OK.
Check if the
IC201, IC202 PIN 35 is
High?
Refer to STA304A.
Check if the
IC801, IC802, IC803 PIN
4, 7, 12, 15 waveform
are OK.
Refer to POWER circuit.
Refer to Digital Amp.
Check POWER circuit.
Check OSC circuit XC201.
Check MICOM Control
circuit.
No
No
Yes
Yes
No
Yes
Yes
No
No
Yes
Check if the WC701
is OK.
Check if the
CW507
waveform is OK.
Check if the
CW503 PIN 1 to 7
waveform are OK.
Check if the
CW203 PIN 1 to 7
waveform are OK.
Check if the
IC211 PIN 4, 7, 9, 12
waveform is OK.
Check if the
IC212 PIN 4, 7, 9
waveform is OK.
Reconnect it
Refer to Regulator circuit.
Refer to MPEG Decoder
circuit IC501.
Refer to CN203
Refer to MUX circuit IC211.
Refer to MUX circuit IC212.
Yes
Yes
N
o
N
o
N
o
N
o
N
o
Yes
Yes
Yes
N
o
Yes
1
1
1. DVD Abnormal(w/o DSP)
AUDIO Abnormal
Check if the
IC801, IC802, IC803 PIN
27 is High.
Yes
Check short parretn.
No
DHC-XD350
15
5. Trouble Shooting Guide
DHC-XD350
Check if the IC202
PIN 23,24, 27, 28, 29,
30, 33, 34 and IC201
PIN 27, 28, 33, 34
waveform is OK.
Check if the J801
waveform is OK.
OK
Check if the IC201, 202
PIN 14 is OK.
Check if the
IC201, IC202 PIN 35 is
High?
Refer to STA304A.
Check if the
IC801, IC802, IC803 PIN
4, 7, 12, 15 waveform
are OK.
Refer to POWER circuit.
Refer to Digital Amp.
Check POWER circuit.
Check OSC circuit XC201.
Check MICOM Control
circuit.
No
No
Yes
Yes
No
Yes
Yes
No
No
Yes
Check if the WC701
is OK.
Check if the
CW507
waveform is OK.
Check if the
CW503 PIN 3
waveform is OK.
Check if the
CW304 PIN 20
waveform is OK.
Check if the
IC301 PIN 39, 40, 41
waveform are OK.
Check if the
CW204 PIN 8, 9, 10,
waveform are OK.
Reconnect it
Refer to Regulator circuit.
Refer to IC302, IC309.
Refer to MPEG Decoder
circuit IC501.
Refer to CN203
Refer to Regulator circuit
IC302, IC309
Refer to Reset circuit
Refer to connector
Yes
Yes
No
No
No
No
No
Yes
Yes
Yes
No
Yes
1
1
2. DVD Abnormal(with DSP)
AUDIO Abnormal
Check if the
IC801, IC802, IC803 PIN
27 is High.
Yes
Check short parretn.
No
Check if the
IC304 PIN 5
waveform is OK.
Check if the
IC304 PIN 28
waveform is OK.
Refer to Main PCB
12.288MHz.
Check Micom interface line.
No
No
Yes
Yes
-. Audio Part
16
5. Trouble Shooting Guide
DHC-XD350
OK
Check if the IC208
is OK.
Check if the
IC210 PIN 1, 7
waveform are OK.
Check if the
IC401 PIN 12, 19
waveform are OK.
Check if the
IC406 PIN 1, 7 waveform
are OK.
Check if the
J401
waveform is OK.
Refer to MPEG PCB.
Refer to DSP PCB.
Refer to Filter circuit
IC209, IC210.
Refer to Function circuit
IC401.
Refer to Filter circuit IC406.
Replace Jack.
Yes
Yes
No
No
No
No
No
Yes
Yes
Yes
DVD Recout Abnormal
Refer to H/P Control circuit.
Check if the IC202 PIN
37
is OK.
Check if the
IC203 PIN 12, 15
waveform are OK.
Check if the
IC205 PIN 1, 7
waveform are OK.
Check if the
H/P Jack is OK.
Refer to DDX IC202.
Refer to DAC IC203.
Refer to H/P Amp IC205.
Replace H/P Jack.
Yes
Yes
No
No
No
No
Yes
Yes
H/P output Abnormal
Check if the IC101 PIN
37
is OK.
Check if the
IC204 PIN 12
waveform is OK.
Check if the
IC206 PIN 1
waveform is OK.
Check if the
SW Jack is OK.
Refer to DDX IC201.
Refer to DAC IC204.
Refer to OP Amp IC206.
Replace SW Jack.
Yes
Yes
No
No
No
No
Yes
Yes
Subwoofer output
Abnormal
OK
-. Audio Part
17
5. Trouble Shooting Guide
DHC-XD350
OPTICAL OUT
Abnormal
Check if the IC407
PIN 3 waveform is OK.
Check if the IC405
PIN 11 is OK
Check if the IC304
PIN 12 is OK.
Refer to DIR circuit AK4112.
Replace Optical IC.
Refer to 74HCU04 circuit
IC405.
Refer to MPEG circuit.
Yes
Yes
Yes
No
No
No
MAIN VOLUME &
CHANNEL Level
Abnormal
Check if the
IC201, IC202 STA304A is
OK.
Refer to FRONT PCB. Refer to DDX STA304A.
N
o
Yes
Optical in OK
Refer to Dir circuit IC304
AK4112.
Optional in
Abnormal(with DSP
option)
Check if the
IC408 PIN 1 is OK.
Check if the IC408
PIN 3 is OK.
Refer to POWER SUPPLY
circuit.
Yes
Yes
N
o
N
o
Check if the IC405
PIN 2 waveform is OK.
Check if the IC304
PIN 20 waveform is OK.
Replace OPTICAL IC.
Refer to 74HCU04 circuit
IC405.
Yes
Yes
N
o
N
o
Check if the IC407
PIN 1 waveform is OK.
Refer to Power supply
circuit.
No
Yes
REMOTE CONTROL
Abnormal
Check if the IC703 PIN
31 is OK.
Refer to MICOM circuit IC703. Refer to RMC IC IC702.
No
Yes
-. Audio Part
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