NAD T 572 User manual

NAD
SERVICE MANUAL
T 572
T 572
DVD / VCD / CD
PLAYER
DVD / VCD / CD PLAYER
DRAFT DATE: 30 OCT, 2002

CONTENTS
SECTION 1 . . . . SUMMARY
SECTION 2 . . . . CABINET & MAIN CHASSIS
SECTION 3 . . . . ELECTRICAL
SECTION 4 . . . . MECHANISM
SECTION 5 . . . . REPLACEMENT PARTS LIST

SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS ......... 1-2
SERVICING PRECAUTIONS .................................................................................. 1-3
• GENERAL SERVICING PRECAUTIONS
• INSULATION CHECKING PRODEDURE
• ELECTROSTATICALLY SENSITIVE DEVICES

1-2
CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY,
NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFAC-
TURER’S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY
VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANY
RESULTING PROPERTY DAMAGE OR USER INJURY.
SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE
THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY
CHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE,
INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE
USER.
WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTEC-
TION FROM A.C. LINE SHOCK.
SAFETY CHECKS
AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRECTED. A
CHECK SHOULD BE MADE OF THE FOLLOWING.
SUBJECT : FIRE & SHOCK HAZARD
1. BE SURE THAT ALL COMPONENTS ARE POSITIONED IN SUCH A WAY
AS TO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS.
THIS IS ESPECIALLY IMPORTANT ON THOSE MODULES WHICH ARE
TRANSPORTED TO AND FROM THE REPAIR SHOP.
2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE DEVICES
SUCH AS INSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN
RELIEFS, POWER SUPPLY CORDS, AND OTHER HARDWARE HAVE
BEEN REINSTALLED PER ORIGINAL DESIGN. BE SURE THAT THE
SAFETY PURPOSE OF THE POLARIZED LINE PLUG HAS NOT BEEN
DEFEATED.
3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLE COLD
SOLDER JOINTS, SOLDER SPLASHES OR SHARP SOLDER POINTS.
BE CERTAIN TO REMOVE ALL LOOSE FOREIGN PARTICLES.
4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR DETERIORATION
TO PARTS AND COMPONENTS, FOR FRAYED LEADS, DAMAGED
INSULATION (INCLUDING A.C. CORD), AND REPLACE IF NECESSARY.
FOLLOW ORIGINAL LAYOUT, LEAD LENGTH AND DRESS.
5. NO LEAD OR COMPONENT SHOULD TOUCH A RECIVING TUBE OR
A RESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUND
PROTRUDING METAL SURFACES MUST BE AVOIDED.
6. ALL CRITICAL COMPONENTS SUCH AS FUSES, FLAMEPROOF
RESISTORS, CAPACITORS, ETC. MUST BE REPLACED WITH EXACT
FACTORY TYPES, DO NOT USE REPLACEMENT COMPONENTS
OTHER THAN THOSE SPECIFIED OR MAKE UNRECOMMENDED CIR-
CUIT MODIFICATIONS.
7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM AN A.C.
LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABI-
NET, (THE CHANNEL SELECTOR KNOB, ANTENNA TERMINALS. HAN-
DLE AND SCREWS) TO BE SURE THE SET IS SAFE TO OPERATE
WITHOUT DANGER OF ELECTRICAL SHOCK. DO NOT USE A LINE
ISOLATION TRANSFORMER DURING THIS TEST USE AN A.C. VOLT-
METER, HAVING 5000 OHMS PER VOLT OR MORE SENSITIVITY, IN
THE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESIS-
TOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR
BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CON-
DUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME.
MEASURE THE A.C. VOLTAGE ACROSS THE COMBINATION OF 1500
OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG
AND REPEAT A.C. VOLTAGE MEASUREMENTS FOR EACH EXPOSED
METALLIC PART. VOLTAGE MEASURED MUST NOT EXCEED 75
VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY
VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK
HAZARD AND MUST BE CORRECTED IMMEDIATELY.
SUBJECT: GRAPHIC SYMBOLS
THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN
AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE
SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED
“DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAG-
NITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.
THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIAN-
GLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO
THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN
SERVICE LITERATURE.
SUBJECT : X-RADIATION
1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PER-
SONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTEN-
TIAL SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PIC-
TURE TUBE. HOWEVER, THIS TUBE DOES NOT EMIT X-RAYS WHEN
THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVEL. THE
PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC. OPERA-
TION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PIC-
TURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIR-
CUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DESIR-
ABLE LEVELS.
2. ONLY FACTORY SPECIFIED C.R.T. ANODE CONNECTORS MUST BE
USED. DEGAUSSING SHIELDS ALSO SERVE AS AN X-RAY SHIELD IN
COLOR SETS, ALWAYS RE-INSTALL THEM.
3. IT IS ESSNTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN
ACCURATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRA-
TION OF THE METER SHOULD BE CHECKED PERIODICALLY
AGAINST A REFERENCE STANDARD, SUCH AS THE ONE AVAILABLE
AT YOUR DISTRIBUTOR.
4. WHEN THE HIGH VOLTAGE CIRCUITRY IS OPERATING PROPERLY
THERE IS NO POSSIBILITY OF AN X-RADIATION PROBLEM. EVERY
TIME A COLOR CHASSIS IS SERVICED. THE BRIGHTNESS SHOULD
BE RUN UP AND DOWN WHILE MONITORING THE HIGH VOLTAGE
WITH A METER TO BE CERTAIN THAT THE HIGH VOLTAGE DOES
NOT EXCEED THE SPECIFIED VALUE AND THAT IT IS REGULATING
CORRECTLY. WE SUGGEST THAT YOU AND YOUR SERVICE ORGA-
NIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGE REGU-
LATION IS ALWAYS CHECKED AS A STANDARD SERVICING PROCE-
DURE AND THAT THE HIGH VOLTAGE READING BE RECORDED ON
EACH CUSTOMER’S INVOICE.
5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN
A PRODUCT WITH A PROBLEM OF EXCESSIVE HIGH VOLTAGE,
AVOID BEING UNNECESSARILY CLOSE TO THE PICTURE TUBE AND
THE HIGH VOLTAGE SUPPLY. DO NOT OPERATE THE PRODUCT
LONGER THAN IT IS NECESSARY TO LOCATE THE CAUSE OF EXCES-
SIVE VOLTAGE.
6. REFER TO HV. B+ AND SHUTDOWN ADJUSTMENT PROCEDURES
DESCRIBED IN THE APPROPRIATE SCHEMATIC AND DIAGRAMS
(WHERE USED).
SUBJECT: IMPLOSION
1. ALL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTE-
GRAL IMPLOSION PROTECTION SYSTEM, BUT CARE SHOULD BE
TAKEN TO AVOID DAMAGE DURING INSTALLATION, AVOID
SCRATCHING THE TUBE. IF SCRATCHED REPLACE IT.
2. USE ONLY RECOMMENDED FACTORY REPLACEMENT TUBES.
SUBJECT : TIPS ON PROPER INSTALLATION
1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBY-
HOLE OR CLOSELY FITTING SHELF SPACE, OVER OR CLOSE TO
HEAT DUCT, OR IN THE PATH OF HEATED AIR FLOW.
2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO
INSTALLATIONS WHERE DEW IS A FACTOR, NEAR STEAM RADIA-
TORS WHERE STEAM LEAKAGE IS A FACTOR, ETC.
3. AVOID PLACEMENT WHERE DRAPERIES MAY OBSTRUCT REAR
VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DEC-
ORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT
OBSTRUCT VENTILATION.
4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMER-
CIAL MOUNTING KIT, MUST FOLLOW THE FACTORY APPROVED
MOUNTING INSTRUCTIONS. A PRODUCT MOUNTED TO A SHELF OR
PLATFORM MUST RETAIN ITS ORIGINAL FEET (OR THE EQUIVALENT
THICKNESS IN SPACERS) TO PROVIDE ADEQUATE AIR FLOW
ACROSS THE BOTTOM. BOLTS OR SCREWS USED FOR FASTENERS
MUST NOT TOUCH ANY PARTS OR WIRING. PERFORM LEAKAGE
TEST ON CUSTOMIZED INSTALLATIONS.
5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ON
SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS
PROPERLY SECURED.
6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE ON ITS
MOUNTING TO THE CART. CAUTION THE CUSTOMER ON THE HAZ-
ARDS OF TRYING TO ROLL A CART WITH SMALL CASTERS ACROSS
THRESHOLDS OR DEEP PILE CARPETS.
7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR STAND
WHICH HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES,
INC. FOR USE WITH THEIR SPECIFIC MODEL OF TELEVISION
RECEIVER OR GENERICALLY APPROVED FOR USE WITH T.V.’S OF
THE SAME OR LARGER SCREEN SIZE.
8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS.
EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM A SIN-
GLE OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO
HOME AND FAMILY.
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS
A.C. VOLTMETER
GOOD EARTH GROUND
SUCH AS THE WATER
PIPE. CONDUIT. ETC
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART

1-3
SERVICING PRECAUTIONS
CAUTION : Before servicing the DVD covered by this service
data and its supplements and ADDENDUMS, read and fol-
low the SAFETY PRECAUTIONS. NOTE : if unforeseen cir-
cumstances create conflict between the following servicing
precautions and any of the safety precautions in this publi-
cations, always follow the safety precautions.
Remember Safety First:
General Servicing Precautions
1. Always unplug the DVD AC power cord from the AC
power source before:
(1) Removing or reinstalling any component, circuit board,
module, or any other assembly.
(2) Disconnection or reconnecting any internal electrical
plug or other electrical connection.
(3) Connecting a test substitute in parallel with an elec-
trolytic capacitor.
Caution : A wrong part substitution or incorrect
polarity installation of electrolytic capacitors may result
in an explosion hazard.
2. Do not spray chemicals on or near this DVD or any of
its assemblies.
3. Unless specified otherwise in this service data, clean
electrical contacts by applying an appropriate contact
cleaning solution to the contacts with a pipe cleaner,
cotton-tipped swab, or comparable soft applicator.
Unless specified otherwise in this service data, lubrication
of contacts is not required.
4. Do not defeat any plug/socket B+ voltage interlocks with
whitch instruments covered by this service manual might
be equipped.
5. Do not apply AC power to this DVD and/or any of its
electrical assemblies unless all solid-state device heat
sinks are cerrectly installed.
6. Always connect test instrument ground lead to the
appropriate ground before connection the test instrument
positive lead. Always remove the test instrument ground
lead last.
Insulation Checking Procedure
Disconnect the attachment plug from the AC outlet and turn
the power on. Connect an insulation resistance meter(500V)
to the blades of the attachment plug. The insulation resis-
tance between each blade of the attachment plug and acces-
sible conductive parts (Note 1) should be more than 1M-
ohm.
Note 1 : Accessible Conductive Parts including Metal pan-
els, Input terminals, Earphone jacks, etc.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged
easily by static electricity. Such components commonly are
called Electrostatically Sensitive (ES) Devices. Examples of
typical ES devices are integrated circuits and some field
effect transistors and semiconductor chip components.
The following techniques should be used to help reduce the
incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor compo-
nent or semiconductor-equipped assembly, drain off any
electrostatic charge on your body by touching a known
earth ground. Alternatively, obtain and wear a commer-
cially available discharging wrist strap device, which
should be removed for potential shock reasons prior to
applying power to the unit under test.
2. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such
as aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
3. Use only a GROUNDED-tip soldering iron to solder or
unsolder ES devices.
4. Use only an anti-static solder removal device. Some
solder removal devices not classified a “anti-static” can
generate electrical charges sufficient to damage ES
devices.
5. Do not use freon-propelled chemicals. These can
generate electrical charge sufficient to damage ES
devices.
6. Do not remove a replacement ES device from its protec
tive package until immediately before you are ready to
install it. (Most replacement ES devices are packaged with
leads electrically shorted together by conductive foam,
aluminum foil, or comparable conductive material).
7. Immediately before removing the protective material from
the leads of a replacement ES device, touch the protective
material to the chassis or circuit assembly into which the
device will be installed.
Caution : Be sure no power is applied to the chassis or
circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged
replacement ES devices. (Normally harmless motion such
as the brushing together of your clothes fabric or the lifting
of your foot from a carpeted floor can generate static elec-
tricity sufficient to damage an ES device.)

5
SPECIFICATIONS
• GENERAL
Power requirements AC120V, 60Hz
Power consumption 14W
Dimensions(approx.) 430 x 118 x 408mm (16.9 X 4.7 X 16.1 inches)(wxhxd)
Mass(approx.) 5.7kg(12.6 lbs)
Operating temperature 5˚C to 40˚C (41˚F to 104˚F)
Operating humidity 5 % to 90 %
• SYSTEM
Laser Semiconductor laser, wavelength 650nm
Signal system NTSC
Frequency response DVD (PCM 96kHz): 8Hz to 44kHz
DVD (PCM 48kHz): 8Hz to 22kHz
CD: 8Hz to 20kHz
Signal-to-noise ratio More than 100dB (ANALOG OUT connectors only)
Harmonic distortion Less than 0.008%
Dynamic range More than 100dB(DVD)
More than 95dB(CD)
• OUTPUTS
VIDEO OUTPUTS 1Vp-p, 75 ohms, sync negative, RCA jack x 1
S-V IDEO OUTPUTS (Y)1.0V(p-p), 75Ω, negative sync., Mini DIN 4-pin x 1
(C)0.3V(p-p), 75 ohms
COMPONENT VIDEO OUT (Y)1.0V(p-p), 75Ω, negative sync., RCA jack x 1
(PB)/(PR)0.7V(p-p), 75 Ω, RCA jack x 2
Audio output(digital audio) 0.5V(p-p), 75Ω, RCA jack X 1
Audio output(optical audio) 0.5V(p-p), 75Ω,Optical connector x 1
Audio output(analog audio) 2.0Vrms (1kHz, 0dB), 330Ω, RCA jack (L, R) x 2

2-1
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
1. DISASSEMBLY.........................................................................................................................2-2
CABINET DISASSEMBLY ............................................................................................................2-2
CIRCUIT BOARD DISASSEMBLY ...............................................................................................2-3
2. EXPLODED VIEWS ................................................................................................................2-4
1. Cabinet and Main Frame Section ...........................................................................................2-4
2. Packing Accessory Section....................................................................................................2-6

2-2
DISASSEMBLY
CAUTION BEFORE STARTING SERVICING
Electronic parts are susceptible to static electricity and may easily damaged, so do not forget to take a
proper grounding treatment as required.
Many screws are used inside the unit. To prevent missing, dropping, etc. of the screws, always use a
magnetized screw driver in servicing. Several kinds of screws are used and some of them need special
cautions. That is, take care of the tapping screws securing molded patrs and fine pitch screws used to secure
metal parts. If they are used improperly, the screw holes will be easily damaged and the parts can not be fixed.
Top Case
(A)
(A) (A)
(A)
(A)
(A)
(A)
Disc Tray
Tray Door
Front Panel
Stopper
Stopper
CABINET DISASSEMBLY
1. Top Case
1. Release 7 screws (A). (See Fig. 2-1)
2. Lift the top case with holding the back of it,
and remove it in the direction of the arrow.
Fig. 2-1
Fig. 2-2
Fig. 2-3
3. Front Panel
1. Eject the disc tray. (See Fig. 2-2)
2. Remove the tray door. (See Fig. 2-2)
3. Pull the front panel toward you while pressing
5 stoppers to disengage, and remove the front
panel. (See Fig. 2-3)
2.Tray Door
1.Eject the disc tray.
2.Lift up the tray door in the direction of the
arrow.

2-3
(L1)
(L1)
(B)
(B)
(C)
(C)
(C)
Power Code
Power
Circuit
Board
Main Chassis
MA Ass'y Dpm1
Bracket Main
Jack Circuit Board
(F)
(F)
(F)
(F)
Main Circuit Board
(B)
(B)
(D)
(E)
(D)
(D)
(D)
(E) (E)
(B)
(B)
(G)
(G)
(G)
(G)
(G)
(G)
Fig. 2-4
Fig. 2-5
1. Disassemble Main circuit board, Jack
circuit board, Power circuit board and
MD Ass'y DPM1.
1. Remove the top case.(See Fig. 2-1)
2. Remove 10 screws (B).
3. Disassemble Main circuit board and Jack circuit
board from Bracket Main.
4. Unscrew 3 screws(C) at Bracket Main.
5. Disassemble Bracket Main from Main chassis.
6. Unscrew 4 screws(D) at MD Ass'y DPM1.
7. Turn the portion the direction of arrow to move
the Base Assembly Tray in front of you.
8. Release the other 3 screws(E).
9. Disassemble MD Ass'y DPM1 from Main chassis.
10. Unscrew 4 screws(F) at Power circuit.
11. Disassemble power circuit board from Main
chassis.
CIRCUIT BOARD DISASSEMBLY
Note: Before removing the main circuit board, be sure to shortcircuit the laserdiode output land.
After replacing the main circuit board, open the land after inserting the flexible connector.
(Refer to Mechanism Disassembly)
2. Digitron and Key Circuit Board
1. Remove the front panel.(See Fig. 2-3)
2. Release 6 screws (G), and remove the digitron
circuit board.

2-4
EXPLODED VIEWS
1. Cabinet and Main Frame Section
465
465
250
462
462
300
465
260
465
A46
A47
463
463
275
463
463
463
467
A48
463
463
463
463
463
A00
A43
283
280
285
262
452
452
LED901
PBTOO
A
5
4
3
2
1
BCD
DSP
POWER SUPPLY
A/V OUT

2-5
•Cabinet and Main Frame Section
S AL LOCA.NO PART NO(LG) A B DESCRIPTION SPECIFICATION REMARKS
ASSEMBLY PARTS SECTION
A43 3501RF3434C O BOARD ASSEMBLY FRONT(DMN5026N_T572_AH
A43 3501RF3434D O BOARD ASSEMBLY FRONT(DMN5025E_T572_C)
A46 6885R-0550G OSUB PWB(PCB) ASSEMBLY DSP BOARD DMN5026N EVNT NAD CHANGER SVC DSP
A46 6885R-0550H OSUB PWB(PCB) ASSEMBLY DSP BOARD DMN5025E EVNT NAD CHANGER SVC DSP
A47 6871R-5089A OPWB(PCB) ASSEMBLY,TOTAL DMN5026N HA1UNN IO BLUE PCB A/V OUTPUT
A47 6871R-5089B OPWB(PCB) ASSEMBLY,TOTAL DMN5025E HA2DNN IO BLUE PCB A/V OUTPUT
A48 6871R-5088A OPWB(PCB) ASSEMBLY,TOTAL POWER PCB DMN5026N HA1UNN SMPS BLUE PCB PSB
A48 6871R-5088B OPWB(PCB) ASSEMBLY,TOTAL POWER PCB DMN5025E HA2DNN SMPS BLUE PCB PSB
PARTS SECTION
250 3110R-0194U O O CASE DVD - TOP(5-DVD . W/O DVD .
260 3141R-0059R O CHASSIS ASSEMBLY DVD DMP5024N MAIN HA1UPP NSP
260 3141R-0059S O CHASSIS ASSEMBLY DMN5026N T572#SH NSP
275 4811R-0027F O BRACKET ASSEMBLY MAIN(DVM5000 . W/O GND . ADD S
280 3721R-F228C O PANEL ASSEMBLY,FRONT FRONT (DMN4026N) NAD T572 AH
280 3721R-F228D O PANEL ASSEMBLY,FRONT FRONT (DMN4025E) NAD T572 C
283 3580R-T041B O O DOOR,CASE TRAY (T572) NAD
285 3301R-M019A O O PLATE ASSEMBLY VCR - SHIELD(T571)NAD
300 6410RAHJ02A O POWER CORD JL001/NISPT-2 18AWGX2C 105C JI
300 6410RCHJ02A O POWER CORD JL201B WITH CORE JIULIAN VDE/
SCREW
455 353-051E O O SCREW SPECIAL (3X12)
462 353-085E O O SCREW,DRAWING +3 D4.0 L10.0 MSWR3/FZMCW-2
463 353-051G O O SCREW,DRAWING +2 D3.0 L8.0 MSWR3/FN TB ROUN
465 353-046K O O SCREW SPECIAL (3X10 B.K)

2-6
2. Packing Accessory Section
BATTERY
808
PACKING SHEET
804
PACKING
803
811
812
OWNER'S MANUAL
PLUG ASS'Y 1WAY
PLUG ASS'Y 2WAY
801
REMOCON
900
BOX CARTON
802
PACKING
803
810 RF CABLE
•Packing Accessory Section Part List
S AL LOCA.NO PART NO(LG) A B DESCRIPTION SPECIFICATION REMARKS
801 3835RS0042D O INSTRUCTION ASSEMBLY DMN5025E_HA2DNN
801 3835RS0042E O INSTRUCTION ASSEMBLY DMN5026N_HA1UNN
802 3890R-H524M O BOX DMN5025E HA2DNN SW3-A 1.745 1
802 3890R-H524N O BOX DMN5026N HA1UNN SW3-A 1.745 1
803 3920R-E038A O O PACKING,CASING DMN4022N 0.02 110 EPS 8 430 89
804 292-053E O O BAG V3 NSP
808 841-0021 O O BATTERY,MN ER03X HI WATT 1.5V .MA/H AAA
810 6851RP0003N O O CABLE ASSY,RF DVD CABLE ASSY,RCA USING AREA
811 6611R1G001A O O PLUG ASSY 1WAY YELLOW GLOBAL
812 6611R2G001A O O PLUG ASSY 2WAY RED/WHITE GLOBAL
900 6711R2N010X O O REMOTE CONTROLLER ASSY D1 DMN4022N NAD W/DISC SKIP

3-1
SECTION 3
ELECTRICAL
CONTENTS
ELECTRICAL TROUBLESHOOTING GUIDE......................................................................3-2
1. Power(SMPS) Circuit...............................................................................................................3-2
2. µ-com Circuit............................................................................................................................3-3
3. MPEG Circuit............................................................................................................................3-6
4. Front Circuit(Digitron & Key) ................................................................................................3-7
5. RF/Servo Circuit ......................................................................................................................3-8
BLOCK DIAGRAMS ..................................................................................................................3-12
1. Overall Block Diagram ..........................................................................................................3-12
2. Power (SMPS) Block Diagram..............................................................................................3-13
3. RF/CD DSP/DVD DSP/DVD servo Block Diagram ..............................................................3-14
4. Audio Block Diagram ............................................................................................................3-15
5. MPEG Block Diagram...........................................................................................................3-16
CIRCUIT DIAGRAMS................................................................................................................3-17
1. Power (SMPS) Circuit Diagram ............................................................................................3-17
2. DVD DSP Circuit Diagram.....................................................................................................3-19
3. Drive & RF Circuit Diagram ..................................................................................................3-21
4. MPEG Circuit Diagram ..........................................................................................................3-23
•WAVEFORMS ...........................................................................................................................3-25
5. Audio DM & 5.1CH Circuit Diagram .....................................................................................3-27
6. TIMER & Key Circuit Diagram ..............................................................................................3-29
7. A/V Circuit Diagram ...............................................................................................................3-31
8. Jack Circuit Diagram(T572AH) .............................................................................................3-33
9. Jack Circuit Diagram(T572C)................................................................................................3-35
•CIRCUIT VOLTAGE CHART .........................................................................................................3-37
PRINTED CIRCUIT DIAGRAMS ............................................................................................3-41
1. MAIN P.C.BOARD ...................................................................................................................3-41
2. AV JACK P.C.BOARD.............................................................................................................3-43
3. SMPS P.C.BOARD ..................................................................................................................3-44
4. FRONT P.C.BOARD................................................................................................................3-43

3-2
ELECTRICAL TROUBLESHOOTING GUIDE
No 5V_D
or 5V_A .
No 5.2VA.
Is 5.2VAsection working? (Is the
POWER CTL at Pin6 High/low?)
Is oscillation present at the
Base of Q108?
Replace Q108.
Check D109, C123, R125,
R124.
Replace R102.
Replace BD101.
(Bridge rectifier)
Is R102(R104) normal?
Is about AC 100V applied to
IC101 Pin 3.
Check IC101.
Is 5.2V applied to IC102
Pin 1?
Is there a DC voltage at the
(+) terminal of BD101?
Check R127, 128.
(SHUTDOWN CKT)
1. Power(SMPS) Circuit
No FLD
Is 5.2VA section working?
Replace SMPS trans(T101).
Replace the inferior
components.
Are D109, L103 open?
NO
NO
NO
NO
NO
NO
YES
YES YES
YES
YES
YES
YES
A. B.
NO
NO

3-3
Replace Main B/D
Refer to Front Part
Replace IC503
Reconnect it.
2. µ-COM Circuit
A. No Power
Does Logo appear
on the screen?
Is oscillation of
X501 normal?
Are IC501 Pins 193, 80
and 81 normal?
Does “Hello”appear on FLD?
Is P3901
connected normally?
16, 19 normal?
The waveform
on 3, 5, 7 pin of IC503
normal?
Check the oscillation
Check short.
OK
Replace IC501
or IC3F1.
Check power.
(Refer to power)
If power is
normal
OK
POWER ON
1
1
YES
YES
YES
NO
YES
YES
YES
A
NO
NO
NO
NO
NO
NONO
YES
A
Is P3901 Pin 15,

3-4
B. Audio abnormal
D. Open/Close abnormal
Check the
connection of P3901.
Check IC301 Pins 3, 4.
Check Audio jack.
YES (If OK)
YES
NO
NO
YES
YES (If OK)
YES
YES (If OK)
YES (If OK)
YES (If OK)
Refer to Audio part.
Refer to Decoder part.
Refer to PANTERA part.
Replace B/D.
Check Front.
Reconnect it.
Refer to SERVO part.
Check the connection of MD.
AUDIO ABNORMAL
OPEN/CLOSE ABNORMAL
C. Video abnormal
Check Video jack.
YES (If OK)
YES (If OK)
YES (If OK)
Refer to Video part.
Refer to PANTERA part.
Replace B/D.
VIDEO ABNORMAL

3-5
E. Picture abnormal
Check the disc.
If OK
YES (If OK)
YES (If OK)
Refer to Servo part
Check DSP
Check PANTERA
Replace B/D
PICTURE ABNORMAL
F. Disc Error
Check Disc
YES (If OK)
YES (If OK)
Refer to Servo part
Replace B/D
DISC ERROR

3-6
Power is on
Does Logo appear
on the screen?
Does the
moving picture of the DVD Disc
play on the screen
normally?
Is PANTERA
data signal normal?
Is error signal normal?
Is PANTERA data
signal normal?
Is Clock normal?
Does the audio
sound output from PANTERA
decoder?
Does the
moving picture of the video
CD play on the screen
normally?
Does the audio sound
output normally?
END
Check power & clock.
Check CD/DVD DSP output
signal.
Check CD/DVD DSP output
signal.
Check CD/DVD DSP output
signal.
Check clock signal
Check clock signal
YES
YES
YES
YES YES
YES
YES
YES
YES
YES
NO
NO NO
OK
NO
NO
NO
NO
NO
3. PANTERA Circuit
_OPTION
_If included VCD function.

3-7
NO
NO
NO
START
Does remote control
work normally?
Do all the
buttons work
normally?
Check waveform of
IC901 Pin 14, 15.
Check waveform
of IC901 Pin 18, 19.
Is Digitron on normally?
LED ON?
Check waveform
of IC901 Pin 7.
Is oscillation of
X901 normal?
Is waveform of IC901
Pin 20 normal?
Check waveform
of IC901 Pin 15.
Does pulse
waveform of RC901 Pin 1
appear?
Is IC901
Pin 28 connected to
RC901 Pin 1 ?
Is RC901 Pin 2 5V?
Power on.
Check and replace
R926, R925.
Solder defective parts again.
Solder defective parts
Replace IC901.
Solder Key part.
Check Power.
Replace IC902.
Replace IC901.
Replace LED901.
Replace RC901.
Re-solder.
Recheck
Replace IC901.Complete repairing Front B/D.
NO
NO
NO
NO
NO
NONONO
NO
YES
YES YES
YES
YES YES
YES
YES
YES YES
YES
YES YES
YES
YES
YES
CD
4. Front Circuit (Digitron & key)

3-8
Does signal pulse
input to IC201 Pins 53, 54 when
the powe is on?
Does signal goes
"High" to IC201 Pin186 when the
power is on?
Does
33.8688MHz clock input
to IC201 Pin 63?
Replace IC201
(IC206 soldering or IC defect).
Check "2.PANTERA Part".
Replace X201 or IC206
(30MHz clock defect)
CHECK POINT(General)
5. RF/Servo Circuit
A.
NO
NO
NO
YES
YES
YES