Zenith ZDX-313 Service manual

SERVICE MANUAL

Product Type: VCR+DVD COMBI Chassis: D37 + DP-9C Manual Series: ZDX-313 Manual Part #: 3829RGN004E Model Line: D Product Year: 2005

SUMMARY CABINET & MAIN CHASSIS ELECTRICAL MECHANISM OF VCR PART MECHANISM OF DVD PART REPLACEMENT PARTS LIST

1 2 3 4 5 6

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Published March 2005

by Technical Publications

Zenith Electronics Corporation

201 James Record Road

Huntsville, Alabama 35824-1513

Printed in U.S.A

Model Series:

CONTENTS

ZDX-313

CONTENTS

SECTION 1 . . . . SUMMARY

SECTION 2 . . . . CABINET & MAIN CHASSIS

SECTION 3 . . . . ELECTRICAL

SECTION 4 . . . . MECHANISM OF VCR PART

SECTION 5 . . . . MECHANISM OF DVD PART

SECTION 6 . . . . REPLACEMENT PARTS LIST

SECTION 1

SUMMARY

CONTENTS

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS ............. 1-3

SERVICING PRECAUTIONS .................................................................................................. 1-4

• General Servicing Precautions

• Insulation Checking Prodedure

• Electrostatically Sensitive Devices

SERVICE INFORMATION FOR EEPROM ........................................................................... 1-5

SPECIFICATIONS ....................................................................................................................... 1-6

1-31-3

CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY, NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFACTURER’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 PROTECTION 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 PROTRUNING 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 CIRCUIT MODIFICATIONS.

7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM AN A.C. LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABINET, (THE CHANNEL SELECTOR KNOB, ANTENNA TERMINALS. HANDLE 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. VOLTMETER, HAVING 5000 OHMS PER VOLT OR MORE SENSITIVITY, IN THE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESISTOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CONDUIT, 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 MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.

THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE 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 PERSONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTENTIAL SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PICTURE 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. OPERATION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PICTURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIRCUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DESIRABLE LEVELS.

2. ONLY FACTORY SPECIFIED C.R.T. ANODE CONNECTORS MUST BE USED. DEGAUSSING SHIELDS ALSO SERVE AS 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 ORGANIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGE REGULATION IS ALWAYS CHECKED AS A STANDARD SERVICING PROCEDURE. AND THAT THE HIGH VOLTAGE READING BE RECORDER 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 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, CUBBYHOLE 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 RADIATORS WHERE STEAM LEAKAGE IS A FACTOR, ETC.

3. AVOID PALCEMENT WHERE DRAPERIES MAY OBSTRUCT REAR VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DECORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT OBSTRUCT VENTILATION.

4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMERCIAL 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 HAZARDS 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 SINGLE 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

1-41-4

SERVICING PRECAUTIONS

CAUTION : Before servicing the VCR+DVD covered by this service data and its supplements and addends, read and follow the

SAFETY PRECAUTIONS. NOTE : if unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions in this publications, always follow the safety precautions.

Remembers Safety First:

General Servicing Precautions

1. Always unplug the VCR+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 VCR+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 VCR+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 resistance between each blade of the attachment plug and accessible conductive parts (Note 1) should be more than 1Mohm. Note 1 : Accessible Conductive Parts including Metal panels, 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 component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially 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 grouned-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 electricity sufficient to damage an ES device.)

1-5

SERVICE INFORMATION FOR EEPROM

POWER ON

DVD LOGO Status (NO Disk status)

Remotecontrol Pause key-->1-->4-->7-->2 in order.

Press number 0~9, Press charater A~F (1~6 for a while)

Use arrow key (

F D G E

) to move to approprite position and make changes

Press pause key once

Change will be applied when power

OFF-->ON.

* OPTION

• NTSC model doesn’t have VCR option and use DVD option B~F as VCR option. (only DVD exist)

• PAL model has another separate VCR option. (Both VCR and DVD exist)

MODEL ZDX-313

NAME HEX

OPT 1 55 OPT 2 53 OPT 3 00 OPT 4 41 OPT 5 12 OPT 6 05 OPT 7 64 OPT 8 00 OPT 9 00 OPT A 00 OPT B C0 OPT C 40 OPT D 20 OPT E 00 OPT F 03 OPT G 3D

DETECT NEW EEPROM (OPTION EDIT SCREEN)

1-6

SPECIFICATIONS

• GENERAL

Power requirements 120V, 60 Hz Power consumption 16 W Dimensions (approx.) 16.9" X 3.1" X 10.4" (430 X 78.5 X 265 mm) (w x h x d) Weight (approx.) 9.24 lbs (4.2 kg) Operating temperature 5˚C to 40˚C (41˚F to 104˚F) Operating humidity 5 % to 90 % Signal system NTSC

• INPUTS

ANTENNA IN 75 ohms (VHF/UHF/CATV) VHS VIDEO IN(LINE1, 2) 1 V (p-p) 75 ohms, sync negative, RCA jack x 2 VHS AUDIO IN(LINE1, 2) -6.0 dBm more than 47 ohms, RCA jack (L, R) x 2

• OUTPUTS

VIDEO OUT 1 V (p-p) 75 ohms, sync negative COMPONENT VIDEO OUT (Y) 1.0 V (p-p), 75 ohms, negative sync, RCA jack x 1 (PROGRESSIVE SCAN) (Pb)/(Pr) 0.7 V (p-p), 75 ohms, RCA jack x 2 Audio output (digital audio) 0.5 V (p-p), 75 ohms, RCA jack x 1 Audio output (analog audio) 2.0 Vrms (1 KHz, 0 dB), 600 ohms, RCA jack (L, R) x 1 RF OUT Channel 3 or 4 (Adjustable)

• VCR SPECIFICATIONS

Head system Four head helical scan azimuth system Timer 12-hour display type with AM, PM Tape speed SP: 33.35 mm/sec, LP: 16.67 mm/sec, SLP: 11.12 mm/sec Tape width 12.7 mm Maximum recording time SP: 2 HOURS (T-120), SLP: 6 HOURS (T-120)/8 HOURS (T-160) Rewind time About 3 minutes (T-120) Channel coverage VHF: 2-13, UHF: 14-69, CATV: 1-125 (4A, A-W, W+1 - W+84, A-5 - A-1) Frequency range 20 Hz to 20 kHz Signal-to-noise ratio More than 43 dB Dynamic range More than 88 dB Channel separation More than 60 dB

• DVD SPECIFICATIONS

Laser system Semiconductor laser, wavelength 650 nm Frequency response DVD (PCM 96 kHz): 8 Hz to 44 kHz,

DVD (PCM 48 kHz): 8 Hz to 22 kHz

CD: 8 Hz to 20 kHz Signal-to-noise ratio More than 100 dB (ANALOG OUT jacks only) Harmonic distortion Less than 0.008% Dynamic range More than 95 dB (DVD/CD)

2-1

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

EXPLODED VIEWS .....................................................................................................................2-2

1. Cabinet and Main Frame Section ...........................................................................................2-2

2. Packing Accessory Section ....................................................................................................2-3

2-2

EXPLODED VIEWS

1. Cabinet and Main Frame Section

BCD

463

470

463

457

469

A47

324

A46

8 28

323

65 2

274

463

465

25 0

463

471

A00

A44

61 2

30 3

0 30

61 2

A43

61 2

469

463

A50

284

280

283

286

A26

285

452

0 6 2

2-3

2. Packing Accessory Section

810

808

BATTERY

REMOTE CONTROLLER

900

ASSEMBLY

803

PACKING, CASING

CABLE ASS'Y RF

806

811

PLUG ASS'Y 1WAY

812

PLUG ASS'Y 2WAY

INSTRUCTION ASSEMBLY

801

PACKING, CASING

803

RF CABLE

BAG

804

802

BOX

3-1

SECTION 3

ELECTRICAL

CONTENTS

OVERALL WIRING DIAGRAM.....................3-2

VCR PART

ELECTRICAL ADJUSTMENT PROCEDURES

..................................................3-3

ELECTRICAL TROUBLESHOOTING GUIDE

......................3-4

1. POWER(SMPS) CIRCUIT .............................3-4

2. SYSTEM/KEY CIRCUIT ................................3-8

3. SERVO CIRCUIT ...........................................3-9

4. OSD CIRCUIT ..............................................3-11

5. Y/C CIRCUIT................................................3-12

6. HI-FI CIRCUIT..............................................3-16

7. TUNER/IF CIRCUIT .....................................3-19

BLOCK DIAGRAMS......................................3-21

1. POWER (SMPS) BLOCK DIAGRAM ..........3-21

2. TU/IF BLOCK DIAGRAM ............................3-23

3. Y/C BLOCK DIAGRAM ...............................3-25

4. NORMAL AUDIO BLOCK DIAGRAM .........3-27

5. HI-FI BLOCK DIAGRAM .............................3-29

6. SYSTEM BLOCK DIAGRAM ......................3-31

CIRCUIT DIAGRAMS....................................3-33

1. POWER (SMPS) CIRCUIT DIAGRAM ........3-33

2. TU/IF CIRCUIT DIAGRAM ..........................3-35

3. A/V CIRCUIT DIAGRAM .............................3-37

4. HI-FI CIRCUIT DIAGRAM ...........................3-39

5. JACK CIRCUIT DIAGRAM..........................3-41

6. SYSTEM CIRCUIT DIAGRAM.....................3-43

• WAVEFORMS................................................3-45

• CIRCUIT VOLTAGE CHART.........................3-47

• IC BLOCK DIAGRAMS.................................3-51

PRINTED CIRCUIT DIAGRAMS ...............3-53

1. MAIN P.C.BOARD (TOP SIDE) ...................3-53

2. MAIN P.C.BOARD (BOTTOM SIDE)...........3-57

3. POWER P.C.BOARD...................................3-59

4. KEY P.C.BOARD .........................................3-59

DVD PART

ELECTRICAL TROUBLESHOOTING GUIDE

................................................................3-61

1. SYSTEM OPERATION FLOW .....................3-61

2. SYSTEM TEST FLOW .................................3-62

DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING

............................3-63

1. SYSTEM 27MHZ CLOCK, RESET,

FLASH R/W SIGNAL ...................................3-68

2. SDRAM CLOCK ...........................................3-70

3. TRAY OPEN/CLOSE SIGNAL .....................3-70

4. SLED CONTROL RELATED SIGNAL

(NO DISC CONDITION) ..............................3-71

5. LENS CONTROL RELATED SIGNAL

(NO DISC CONDITION) ...............................3-71

6. LASER POWER CONTROL RELATED

SIGNAL(NO DISC CONDITION).................3-72

7. DISC TYPE JUDGEMENT WAVEFORM .....3-72

8. FOCUS ON WAVEFORM .............................3-73

9. SPINDLE CONTROL WAVEFORM

(NO DISC CONDITION) ...............................3-74

10. ZR36868 AUDIO OPTICAL AND

COAXIAL OUTPUT(SPDIF) .......................3-75

11. ZR36868 VIDEO OUTPUT WAVEFORM ...3-75

12. ZR36868 AUDIO OUTPUT TO

AUDIO DAC ...............................................3-76

13. AUDIO OUTPUT FROM AUDIO DAC .......3-77

BLOCK DIAGRAMS .....................................3-78

1. OVERALL BLOCK DIAGRAM ................3-78

2. SERVO BLOCK DIAGRAM .........................3-79

3. VIDEO & AUDIO BLOCK DIAGRAM ..........3-80

CIRCUIT DIAGRAMS ...................................3-81

1. SYSTEM CIRCUIT DIAGRAM .....................3-81

2. RF & DSP SERVO CIRCUIT DIAGRAM .....3-83

3. AV/JACK CIRCUIT DIAGRAM.....................3-85

• IC BLOCK DIAGRAMS..................................3-87

3-2 3-3

OVERALL WIRING DIAGRAM

VCR DECK

POWER

DVD LOADER / DRIVE

BOARD

KEY

BOARD

123456789

DVD_LD

DVD_PD

VOL(DVD)

GND

Vcc(HF)

PMD01 PMD02

123456789

10111213141516171819202122

Vcc(HF)

VC_INPUT

10111213141516171819202122

F(+)

T(-)

T(+)

F(-)

Vcc

GND

CD_LD

CD_PD

VOL(CD)

Hi-Fi REC

Hi-Fi PB B

PMC01

123456789

CFG

12VA(CAP)

123456789

5.2VA

I-limit

CAP REV'H'

GND

12VA(DRUM)

MOTOR GND

CAP CTL

101112

LD IN

DFG/FG

101112

12345

P3D02

CTL(+)

DRUM CTL

12345

A/E(+)

CTL(-)

A/E(-)

A.PB

A.REC

GND

P3D03

FULL ERASE 2

123456789

GND8VGND

PPM01

REG_9V

REG_12V

MOTOR_Vcc 123456789

MAIN

33V

3.3V PWR_CTL'H'

101112

GND

5.3VA

101112

M5V/5VT

123456789

P3D01

SP PB A

123456789

K-RTN2

GND

1 2

SP REC

SP PB B

EP PB B

EP REC

EP PBA

Hi-Fi PB A

123456789

LM -

FM -

LM +

FM +

SPM -

SPM +

PMD03

123456789

GND

SW(OPEN)

SW(CLOSE)

SW(LEAD IN) 10

GND

BOARD

VCR PART

ELECTRICAL ADJUSTMENT PROCEDURES

1. Servo Adjustment

1) PG Adjustment

• Test Equipment

a) OSCILLOSCOPE b) NTSC MODEL : NTSC SP TEST TAPE

• Adjustment And Specification

MODE

PLAY

MEASUREMENT POINT ADJUSTMENT POINT SPECIFICATION

V.Out

H/SW(TP)

R/C TRK JIG KEY 6.5 ± 0.5H

• Adjustment Procedure

a) Insert the SP Test Tape and play.

Note - Adjust the distance of X, pressing the Tracking(+) or Tracking(-) when the “ATR” is blink after the

SP Test Tape is inserted. b) Connect the CH1 of the oscilloscope to the H/SW(TP) and CH2 to the Video Out for the VCR. c) Trigger the mixed Combo Video Signal of CH2 to the CH1 H/SW(TP) and then check the distance (time

difference), which is from the selected A(B) Head point of the H/SW(TP) signal to the starting point of the vertical synchronized signal, to 6.5H ± 0.5H (412µs, 1H=63µs).

• PG Adjustment Method

a-1) Payback the SP standard tape b-2) Press the “OK(ENTER)” key on the Remote controller and the “REC” key on the Front Panel the same

time, then it goes in to Tracking initial mode.

c-3) Repeat the above step(No.b-2), then PG adjusts automatically. d-4) Stop the playback, PG adjustment is finished.

• CONNECTION

V.Out

• WAVEFORM

H/SW

(TP)

OSCILLOSCOPE

CH1 CH2

R/C KEY

V.outH/SW

(TP)

H/SW

6.5H(412µs)

Composite

VIDEO

3-4

ELECTRICAL TROUBLESHOOTING GUIDE

1. Power(SMPS) CIRCUIT

(1) NNo 5.3VA

No 5.3VA

YES

Is FR101 Normal?

YES

Is BD101 Normal?

YES

Is R101 Normal?

YES

Is Vcc (9V - 18V) supplied to IC101 Pin2?

YES

Are D125

normal?

Is there about 2.5V at IC103 Pin1?

Replace FR101 (Use the same ICW)

Replace BD101

Replace R101

Is D102 normal?

Replace D125

Replace IC103

Check or Replace D102

YES

Is D123 normal?

YES

Is D124 Normal?

YES

Is D121 Normal?

YES

Power Line of Main PCB is short

Replace D123

Replace D124

Replace D121

3-5

3-6

Check the PWR CTL

“H” signal from µ-com

(2) No 5.0V_D

Check the PWR CTL “H” signal from µ-com

(3) No 5.0V_T

No 5.0V_D

YES

Is the Vcc(5.3V) supplied to Q165 Emittor?

YES

Is the Q162 Base ‘H’?

YES

Check or Replace Q165

(4) No 3.3V

Check or Replace D125

Check the PWR CTL “H” signal from µ-com

No 5.0V_T

YES

Is the Vcc(5.3V) supplied to Q163 Emittor?

YES

Is the Q162 Base ‘H’?

YES

Check or Replace Q163

(5) No 33V

Check or Replace D125

No 3.3V

YES

Is there about 3.8V at IC131 pin1?

YES

Is there about 3.3V~5V at IC131 pin4?

YES

Check IC131 and Replace

No 33V

YES

NO NO

Check or Replace D123

NO NO

Check the PWR CTL “H” signal from µ-com

Is the Vcc(33V) supplied to Q161 Emittor?

YES

Is Q162 Base ‘H’?

YES

Check or Replace Q161

Check or Replace D121

3-7

(6) No Motor_Vcc (To Cap, Drum Motor )

(7) No REG 12V

No Motor_Vcc

YES

Is the Vcc(14V) supplied to C134?

YES

Check or Replace the Cap / Drum

(8) No 9V

Check or Replace D124

No REG 12V

YES

Is the Vcc(14V) supplied to Q165 Collector?

YES

Is the Vcc(14V) supplied to Q165 Base?

YES

Check or Replace Q165

(9) No REG 9V

Check or Replace D124

Check the PWR CTL “H” signal from µ-com

Check the 33V Line

No 9V

YES

Is there about 3.8V at IC141 pin1?

YES

Is there about 3.3V~ 5V at IC131 pin4?

YES

Check or Replace IC141

No REG 9V

YES

NO NO

Check or Replace D126

NO NO

Check the PWR CTL “H” signal from µ-com

Is the Vcc(12V) supplied to Q164 Collector?

YES

Is the Vcc(10V) supplied to Q164 Base?

YES

Check or Replace Q164

Check or Replace D124

Check or Replace ZD152

2. SYSTEM/KEY CIRCUIT

Check the Q165 Power Circuit.

Refer to “SMPS MOTOR_Vcc

12 Volt Trouble Shooting”.

Refer to SMPS 5.3VA troubleshooting.

YES

(1) AUTO STOP

Auto Stop

YES

Does the SW30 waveform appear at IC501 Pin18?

YES

Do the T-UP Reel Pulses appear at IC501 Pin80?

YES

Replace IC501.

NO NO

Check the Drum Motor signal.

Do T/UP Reel Pulses appear at the point between R556 and R536?

YES

Replace the T/UP Reel Sensor (RS501).

(2) The unstable loading of a Cassette tape

The unstable loading of a Cassette tape

YES

Does 5V appear at RS501?

Is 12V applied to

PMC01 Pin1?

YES

Does the “H” signal appear at IC501 Pin60 during

inserting of the CST ?

YES

Does the “L” signal appear at IC501 Pin19 during

inserting of the CST?

YES

Check the Deck Mechanism.

Caution :

Auto stop can occur because Grease or Oil is dried up

Check the CST SW and the peripheral circuitry.

3-8

Is 5V applied to R531 ?

Check IC501 Pins22, 23, 24, 25.

3. SERVO CIRCUIT

(1) Unstable Video in PB MODE

Unstable Video in PB Mode.

YES

Does the Noise level of the screen change periodically?

YES

Do the CTL pulses appear at IC501 Pin97?

YES

Does the CFG waveform appear at IC501 Pin87?

YES

On tracking do the CTL pulses move?

YES

Does the Video Envelope waveform appear at IC501 Pin9?

YES

Replace IC501.

(2) When the Drum Motor (2) doesn’t run.

When the Drum Motor doesn’t run,

Does 12V appear at PMC01 Pin8?

Is adjusting the height of the CTL Head accurate?

Replace IC501.

Refer to “When the Y signal doesn’t appear on the screen in PB Mode”.

Refer to “(2) No 12VA of Power section”

Do the Drum PWM Pulses appear at the IC501 Pin76?

YES

Are the foil patterns and

the Components between IC501 Pin76 and PMC01

Pin12 shorted?

Readjust the height of the CTL Head.

Do the DFG Pulses appear at PMC01 Pin11?

YES

Replace the DRUM-M or CAP-M.

YES

Does 2.8V appear at PMC01 Pin12?

YES

Check the connector (PMC01) and the Drum Motor Ass’y.

Do the DFG Pulses appear

at IC501 Pin90?

YES

Do the Drum PWM Pulses appear at IC501 Pin76?

YES

Are the connecting patterns and the Components

between IC501 Pin76 and PMC01 Pin12 shorted?

3-9

Are the foil patterns and

the Components between IC501 Pin 90 and PMC01

Pin11 shorted?

Replace IC501.

3-10

2. SERVO CIRCUIT

(3) When the Capstan Motor doesn’t run,

When the Capstan Motor doesn’t run,

Does 12VA appear at PMC01?

YES

Does 2.8V appear at PMC01 Pin 9?

YES

Check the PMC01 and the Capstan Motor Ass’y.

Are the foil patterns and Components between IC501 Pin77 and PMC01

Pin9 shorted?

Does the CFG signal come into IC501 Pin87?

YES

Refer to “SMPS(CAPSTAN/12Volt)

Trouble Shooting”.

Does the PWM signal appear at IC501 Pin77?

Does the CFG signal appear at PMC01 Pin1?

Check the Capstan Motor Ass’y.

YES

Does the Capstan PWM signal appear at IC501 Pin77?

YES

Are the foil patterns and Components between IC501 Pin77 and PMC01

Pin9 shorted?

Are the foil patterns and component between IC501 Pin87 and PMC01

Pin1 shorted?

Replace IC501.

2. SERVO CIRCUIT

(4) KEY doesn’t working

KEY doesn’t working.

Is 5V applied to IC501 Pin99?

YES

Does LED or FLD change when a function button is pressed?

4. OSD CIRCUIT

(1) No OSD display.

No OSD or F.OSD display.

Is 5.3V applied to IC501 Pin53?

YES

Does oscillation occur at IC501 Pins44, 45?

YES

Refer to “SMPS 5.3VA Trouble Shooting”.

Replace the defective switches.

Refer to “SMPS 5.3VA Trouble Shooting”.

Check or Replace the pheripheral Circurity.(L511, R518, C596, C595)

Replace IC501.

(2) I

C BUS CHECK

The I2C waves don’t come out.

Does Power appear at the Pull up impedence (R569, R507)?

YES

Replace IC501.

Refer to “SMPS 5.3VA Trouble Shooting”.

3-11

5. Y/C CIRCUIT

(1) No Video in EE Mode,

No Video in EE Mode

Does the Video signal appear at IC301 Pins28, 30, 32?

YES

Is REG 5.0V applied to IC301Pins23, 44, 45, 52, 68, 77?

YES

Does the Video signal appear at IC301 Pin26?

Does the Video signal appear at IC302 Pins1, 3?

YES

Is there SW5V at IC302 Pin6?

YES

Replace IC302.

Check the SW 5V Line. (Power Circuit)

Is I2C BUS signal applied to IC301 Pins53, 54, 55?

Check DVD Video Input (IC601, Pin150), Tuner Video Input (TU701 Pin16), Line Video Input (JK901), respectively.

Check the System Circuit. (Refer to ‘SYSTEM I CHECK Trouble Shooting’)

C BUS

YES

Does the Video signal appear at IC501 Pin52?

YES

Does the Video signal

appear at the Q924

Emitter?

YES

Check the path of the signal between the IC301 Pin 26 and IC501 Pins50, 52.

Is there 12V on the terminal of R905?

YES

Replace Q924.

3-12

Replace IC301.

Check the SW 12V Line. (Power Circuit)

3. Y/C CIRCUIT

(2) When the Y(Luminance) signal doesn’t appear on the screen in PB Mode,

Is 5V applied to IC301 Pins23, 44, 45, 52, 68, 77?

YES

Is the Y/C Bus siganl applied to IC301 Pins53, 54, 55?

YES

Does the normal RF signal appear at IC301 Pin 14?

YES

Check the line of the SW 5V Line.

Refer to ‘SYSTEM Y/C BUS CHECK Trouble Shooting’.

Is the V.H.S/W signal applied to IC301 Pin57?

YES

Does the Rectangular waveform(5V) appear at IC301 Pin57(V.H.S/W)

YES

Clean the Drum.

Check the System Circuit. (IC501 Pin18)

Check the V.H.S/W level.

Does the Y(Luminance) signal appear at IC301 Pin20?

YES

Is the Y(Luminance) Video

waveform shown at

IC301 Pin22?

YES

Replace IC301.

Check R328, C322, C323.

Check C324.

3-13

3. Y/C CIRCUIT

(3) When the C(Color) signal doesn’t appear on the screen in PB Mode,

Is SW 5V applied to IC301 Pins23, 44, 45, 52, 68, 77?

YES

Does the Color signal appear at IC301 Pins41, 50?

YES

Replace IC301.

Check the line of the REG 5V Line. (Power Circuit)

Is the oscillation frequency

of X301 (3.58MHZ) normal?

Does the Color signal appear at IC301 Pin48?

YES

Replace IC301.

Replace X301.

Check C342, C341, R333.

3-14

3. Y/C CIRCUIT

(4) When the Video signal doesn’t appear on the screen in REC Mode,

REC mode

YES

Is EE mode normal?

YES

Is brightness normal?

YES

Is the brightness signal supplied to IC301 Pins18?

YES

Check the power of Pins23, 44, 45, 52, 68, 77.

YES

Check the SW 5V power Check system part

YES

YES YES

Check the EE mode

Is color

Does signal appear at IC301 Pins41, 50?

Is SW 5V supplied to IC301 Pins23, 44, 45, 68, 77?

Is Y/C Bus applied to IC301 Pins53, 54, 55?

normal?

YES

Check X301 oscillation frequency.

Check the SW 5V power.

Do X301 and X-TAL oscillate?

YES

Is V.H SW supplied to IC301 Pin57?

YES

Does the FM signal appear at IC301 Pins73(SP)/ 66(EP)?

YES

Replace IC301.

3-15

Check X301.

Check system part (V.H/SW)

Check the drum

*OPTION Pins72, 73, 74(SP) Pins65, 66, 67(EP)

6. Hi-Fi CIRCUIT

(1) No Sound(EE Mode)

No Sound.

YES

Check the SIF.IN of IC801 Pins57.

Check the DVD Audio of IC801

Pins12, 74.

Check the LINE1 Audio of IC801 Pins11, 73.

Check the LINE2 Audio of IC801 Pins9, 71.

Check the Vcc of IC801 Pins3, 5, 15, 32, 36, 46, 54.

YES

Check the TU701 SIF Pin13.

Check the DVD MODULE. (PMD02 Pins13, 15).

Check the Rear Jack. (JK901 Audio in).

Check the front Jack. Timer

Check the Power 5V, 5.3VA, REG 9V. CN701 2,3,11,12

Check the IIC Clock and DATA at IC801 Pins37, 38.

YES

Check the Audio of IC801 Pins78, 80.

YES

Check the Audio of C804, C854.

YES

Check JK901

Check IC501 Pins71, 72.

Replace IC801.

Replace C804, C854.

3-16

3-17

3. Y/C CIRCUIT

(2) Hi-Fi Playback

YES

PB mode

No Sound.

Check the Vcc of IC801 (Pins3, 5, 15, 32, 36, 46, 54).

Check the Hi-Fi Selection switch. (IC801 Pin39) and the Tape quality.

Is the RF Envelope at IC801 Pin23 over 3Vp-p?

YES

Check IC801 Pin37(Data), Pin38(Clock)

YES

Do Audio Signals appear at IC801 Pin80(L-CH), 78(R-CH)?

YES

Do Audio Signals appear at JK901?

Check Power.

Check IC501 Pin19 (A.H/SW)

Check the parts of µ-COM (IC501 Pins71, 72)

Check the Connection at P3D01 Pins7, 9.

Check the Jack(JK901)

Check C801, C851, R801, R851.

YES

3-18

(3) Hi-Fi REC

Hi-Fi REC.

It is impossible to record Hi-Fi Audio signal.

Check Vcc of IC801. (Pins3, 5, 15, 32, 36, 46, 54)

YES

Check IC801 Pin37(Data), Pin38(CLOCK).

YES

Do Audio signals appear at IC801 Pin6?

YES

Do Audio signals appear at IC301 Pin76(Normal Audio)?

YES

Do OSC signals appear at P3D02 pin5 (50Vp-p)

YES

Check Power.

Check ports of µ-CPM. (IC501 Pins71, 72)

Check Audio input signal of IC801 Pin57(TU.A.), 7, 69(DVD.A.), 11, 73(LINE1.A.), 9, 71(LINE2.A.)

Check C825, R337, R338, C371, C3A1

Check REC OSC BLOCK (Q301, Q302, Q304~Q307)

Is “High” IC501 Pin74 in REC mode.

7. Tuner/IF CIRCUIT

(1) No Picture on the TV screen

No picture on the TV screen

YES

Does the Video signal at the TU701 Pin16.

YES

Is +33V applied to TU701 Pin14?

YES

Is +5V applied to TU701 Pin3?

YES

Does the Clock signal appear at TU701 Pin9?

YES

Does the data signal appear at TU701 Pin10?

YES

Replace Tuner.

Check 33V line.

Check 5V line.

Check the lIC Clock Signal of µ-COM Pin71.

Check the lIC Data Signal of µ-COM Pin72.

Does the Video signal appear at IC501 Pin 52.

YES

Does the Video signal appear at JK901

YES

Check the signal flow from IC501 Pin52 to JK901 Pin Video out.

Check the signal from IC301 Pin29 to IC501 Pin50.

Check the signal from IC501 Pin52 to Q924

3-19

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