Zenith XBV-442, XBV-443 Service manual

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

SPECIFICATIONS ...................................................................................................................... 1-5

1-3

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

1-4

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.)

SPECIFICATIONS

GENERAL

Power requirements AC 120V , 60 Hz Power consumption 21W Dimensions (approx.) 16.9" X 3.1" X 10.8" (430 X 78.5 X 273 mm) (w x h x d) Mass (approx.) 8.82 lbs (4.0 kg) Operating temperature 41°F to 104°F (5 °C to 40°C) Operating humidity 5 % to 90 % Signal system NTSC

INPUT

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

OUTPUTS

VIDEO OUT 1 Vp-p 75 ohms, sync negative S-VIDEO OUT (Y) 1.0 V (p-p), 75 ohms, negative sync, Mini DIN 4-pin x 1

COMPONENT VIDEO OUT (Y) 1.0 V (p-p), 75 ohms, negative sync, RCA jack x 1

(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 (Swichable)

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 20Hz to 20kHz Signal-to-noise ratio More than 43dB 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 100dB (ANALOG OUT jacks only) Harmonic distortion Less than 0.008% Dynamic range More than 95 dB (CD), More than 100 dB (DVD)

ACCESSORY:

Video cable x 1, Audio cable(L/R) x 1, RF 75-ohm Coaxial Cable x 1, Remote control x 1, Batteries x 2

• Design and specifications are subject to change without notice.

1-5

2-1

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

1. 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

A43

A60

260

A44

A26

A00

250

300

462

467

457

467

A46

A47

468

323

265

467

465

330

452

261A

285

274

283

284

286

280

BCD

2-3

2. Packing Accessory Section

BATTERY

808

BAG

804

PACKING, CASING

803

806

INSTRUCTION ASSEMBLY

CABLE(COAXIAL)

810

CABLE ASS'Y RF

801

REMOTE CONTROLLER ASSEMBLY

900

BOX

802

PACKING, CASING

803

811

812

PLUG ASS'Y 1WAY

PLUG ASS'Y 2WAY

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 ................................3-7

3. SERVO CIRCUIT ...........................................3-8

4. OSD CIRCUIT..............................................3-10

5. Y/C CIRCUIT ................................................3-11

6. Hi-Fi CIRCUIT..............................................3-15

7. Tuner/IF CIRCUIT........................................3-18

BLOCK DIAGRAMS ......................................3-20

1. Power (SMPS) BLOCK DIAGRAM.............3-20

2. TU/IF BLOCK DIAGRAM ............................3-22

3. Y/C BLOCK DIAGRAM ...............................3-24

4. NORMAL AUDIO BLOCK DIAGRAM.........3-26

5. Hi-Fi BLOCK DIAGRAM .............................3-28

6. SYSTEM BLOCK DIAGRAM ......................3-30

CIRCUIT DIAGRAMS ....................................3-32

1. Power (SMPS) CIRCUIT DIAGRAM...........3-32

2. TU/IF CIRCUIT DIAGRAM ..........................3-34

3. A/V CIRCUIT DIAGRAM .............................3-36

4. Hi-Fi CIRCUIT DIAGRAM ...........................3-38

5. JACK CIRCUIT DIAGRAM..........................3-40

6. SYSTEM CIRCUIT DIAGRAM.....................3-42

7. KEY CIRCUIT DIAGRAM............................3-44

• WAVEFORMS................................................3-46

• CIRCUIT VOLTAGE CHART.........................3-48

PRINTED CIRCUIT DIAGRAMS................3-50

1. MAIN P.C.BOARD .......................................3-50

2. MAIN P.C.BOARD .......................................3-52

3. POWER P.C.BOARD...................................3-54

DVD PART

ELECTRICAL TROUBLESHOOTING

GUIDE & WAVEFORMS ...............................3-56

1. System Clock X601 (27Mhz)......................3-56

2. Initializing between MPEG and SDRAM...3-56

3. Initializing between MPEG and Flash.......3-57

4. Reference Voltage 1 ...................................3-57

5. Reference Voltage 2 ...................................3-58

6. Checking the initial step of M/D Ass’y.....3-58

7. Checking the Video Signal........................3-59

8. Checking the first step of servo (1)..........3-59

9. Checking the second step of servo (2)....3-60

10. Checking the output of Audio signal .....3-60

11. Checking the reset port...........................3-61

12. Checking the focus & tracking servo ....3-61

13. Checking the track jump .........................3-62

14. The status of CD_LD and DVD_LD in

the PLAY MODE........................................3-62

15. The status Focus and spindle motor .....3-63

16. DATA STREAM..........................................3-63

17. Input Clock to IC202 ................................3-64

18. Tray Open and Close ...............................3-64

19. Focus Drive signal(FACT) .......................3-65

20. Signals for Front micom..........................3-65

21. FACT and FE for DVD9 (Dual disc).........3-66

22. System clock of MPEG IC .......................3-66

BLOCK DIAGRAMS ......................................3-67

1. DVD Overall Block Diagram ......................3-67

2. SERVO Block Diagram ..............................3-68

3. MPEG Block Diagram ................................3-69

4. AUDIO Block Diagram ...............................3-70

CIRCUIT DIAGRAMS ....................................3-71

1. RD SERVO CIRCUIT DIAGRAM ................3-71

2. SYSTEM CIRCUIT DIAGRAM.....................3-73

3. AUDIO CIRCUIT DIAGRAM........................3-75

• CIRCUIT VOLTAGE CHART.........................3-77

OVERALL WIRING DIAGRAM

3-2

PMC01

CFG

12VA(CAP)

5.2VA

CAP REV'H'

I-limit

MOTOR GND

GND

12VA(DRUM)

CAP CTL

LD IN

DFG/FG

DRUM CTL

P3D01

SP PB A

SP REC

SP PB B

EP PB B

EP REC

EP PBA

Hi-Fi PB A

Hi-Fi REC

Hi-Fi PB B

PPM01 PMP01

24VA

GND

14VA

GND

5.3VA

33VA

GND

4VA

PMD01 PMD02

Vcc(HF)

DVD_LD

DVD_PD

VOL(DVD)

GND

VC_INPUT

Vcc(HF)

F(+)

T(-)

T(+)

F(-)

Vcc

GND

CD_LD

CD_PD

VOL(CD)

123456789

10111213141516171819202122

123456789

10111213141516171819202122

PMD03

SPM +

SPM -

FM +

FM -

LM -

LM +

SW(OPEN)

SW(CLOSE)

GND

SW(LEAD IN)

GND

123456789

P3D02

CTL(+)

CTL(-)

A/E(+)

A/E(-)

A.REC

A.PB

GND

FULL ERASE

P3D03

DECK MD

ONE

BOARD

SMPS

BOARD

ONE

BOARD

3-3

ELECTRICAL ADJUSTMENT PROCEDURES

1. Servo Adjustment

1) PG Adjustment

• Test Equipment

• Adjustment And Specification

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

MODE

PLAY

• 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 it finishes the PG adjusting automatically. d-4) Stop the playback, then it goes out to PG adjusting mode after mony the PG data.

• CONNECTION

• WAVEFORM

V.Out

H/SW(TP)

R/C TRK JIG KEY 6.5 ± 0.5H

MEASUREMENT POINT ADJUSTMENT POINT SPECIFICATION

V.Out

H/SW

(TP)

OSCILLOSCOPE

CH1 CH2

V.outH/SW

R/C KEY

(TP)

H/SW

Composite

VIDEO

6.5H(412µs)

VCR PART

3-4

ELECTRICAL TROUBLESHOOTING GUIDE

Check or Replace the D102.

Replace the D111.

Replace the D110.

Replace the D113.

YES

Is the D113 normal?

Power Line of Main PCB is short.

1. Power(SMPS) CIRCUIT

NO 5.3VA.

Replace the F101.

(Use the same Fuse)

Is the F101 normal?

Is the R101 normal?

Is the BD101 normal?

Replace the BD101.

Replace the R101.

Is the D102 normal?

Replace the D118 (MTK)/D112(ST).

Replace the IC103.

YES

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

Are the

D118 (MTK)

/D112(ST) normal?

Are the about 2.5V at the IC103 Pin1?

Is the D111 normal?

Is the D110 normal?

(1) No 5.3VA (SYS/Hi-Fi/TUNER)

NO 33V.

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

Check or Replace the D113.

Is the Q162 Base “H”?

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

Check or Replace the Q161

YES

(5) No 33V

3-5

NO 5V.

Check or Replace the D118.

Is the Vcc(5.3V) supplied to Q160 Emitter?

Check or Replace the Q160

Is the Q162 Base “H”?

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

YES

(2) No 5V

No 3.3V.

Check or Replace the D111

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

Is there about 3.7V at the IC152 pin1?

Is there about 3.3V~ 5V at the IC152 pin4?

Check the IC152 and Replace

YES

(3) No 3.3V

No SW5V

Check or Replace the D118.

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

Is the Q164 Base “H”?

NO NO

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

NO NO

YES

Check or Replace the Q163

YES

(4) No SW5V

3-6

NO 13VA.

Check or Replace the D110.

Is the Vcc(13V) supplied to C123?

Check or Replace the cap/Drum

Is the D117/D115 Normal?

Replace the D117/D115.

YES

(6) No 13V(TO Cap, Drum Motor)

NO 8V.

Is there about 13V at the IC151 pn1?

YES

Is there about 3.3V~ 5V at the IC151 pin4?

YES

Check the IC151 and Replace

YES

(7) No 8V

Check or Replace the D110.

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

NO 33V.

Is the Vcc(12V) supplied to Q165 Collector?

Check or Replace the D110.

Is the Vcc(10V) supplied to Q165 Base

Check or Replace the ZD171.

Check or Replace the Q165

YES

(9) No 9V

No REG 12V

Check or Replace the D110.

Is the Vcc(13V) supplied to Q156 Collector?

Is the Vcc(13V) supplied to Q156 Base

NO NO

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

Check the 33V Line

NO NO

YES

Check or Replace the Q156

YES

(8) No REG 12V

3-7

2. SYSTEM/KEY CIRCUIT

(1) AUTO STOP

(2) The unstable loading of a Cassette tape

Auto Stop

Does the SW30 waveform appear at the IC501 Pin18?

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

Is 12V applied to the

PMC01 Pin8?

Check the Drum Motor signal.

Does 5V appear at the RS501?

Check the Q160 Power Circuit.

Refer to “SMPS DRUM 12 Volt Trouble Shooting”.

Is 5V applied to the R531 ?

Refer to SMPS 5.3VA troubleshooting.

Check the IC501 Pins22, 23, 24, 25.

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

Replace the T/UP Reel Sensor (RS501).

Check the CST SW and the peripheral circuitry.

Replace the IC501.

The unstable loading of a Cassette tape

Does the “H” signal appear at the IC501 Pin60 during inserting the CST ?

Does the “L” signal appear at the IC501 Pin19 during inserting the CST?

Check the Deck Mechanism.

Caution :

Auto stop can occur because Grease or Oil is dried up

YES

NO NO

YES

YES YES

3-8

3. SERVO CIRCUIT

(1) Unstable Video in PB MODE

Unstable Video in PB Mode.

Does the Noise level of the screen change periodically?

Do the CTL pulses appear at the IC501 Pin97?

Is adjusting the height of the CTL Head accurate?

Readjust the height of the CTL Head.

Replace the IC501.

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

Does the CFG waveform appear at the IC501 Pin87?

On tracking do the CTL pulses move?

Does the Video Envelope waveform appear at the IC501 Pin9?

Replace the IC501.

YES

(2) When the Drum Motor

(2) doesn’t run.

Do the DFG Pulses appear at the PMC01 Pin11?

Replace the DRUM-M or CAP-M.

Aren’t the foil patterns and the Components between IC501 Pin 90 and PMC01 Pin11 short?

Replace the IC501.

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

Do the Drum PWM Pulses appear at the IC501 Pin76?

Aren’t the foil patterns and the Components between IC501 Pin76 and PMC01 Pin12 short?

Do the DFG Pulses appear at the IC501 Pin90?

Do the Drum PWM Pulses appear at the IC501 Pin76?

Aren’t the connecting patterns and the Components between IC501 Pin76 and PMC01 Pin12 short?

When the Drum Motor doesn’t run,

Does 12V appear at the PMC01 Pin8?

Does 2.8V appear at the PMC01 Pin12?

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

YES

3-9

Does the CFG signal appear at the PMC01 Pin1?

Does the PWM signal appear at the IC501 Pin77?

Does 2.8V appear at the PMC01 Pin 9?

Check the PMC01 and the Capstan Motor Ass’y.

Does the Capstan PWM signal appear at the IC501 Pin77?

Aren’t the foil patterns and Components

between IC501 Pin77 and PMC01 Pin9 short?

Does the CFG signal come into the IC501 Pin87?

Aren’t the foil patterns and Components

between IC501 Pin77 and PMC01 Pin9 short?

2. SERVO CIRCUIT

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

YES

When the Capstan Motor doesn’t run,

Does 12VA appear at the PMC01?

YES

Replace the IC501.

YES

Refer to “SMPS(CAPSTAN/12Volt) Trouble Shooting”.

Aren’t the foil patterns and component between IC501 Pin87 and PMC01 Pin1 short?

Check the Capstan Motor Ass’y.

3-10

4. OSD CIRCUIT

(1) No OSD display.

(2) I2C BUS CHECK

KEY doesn’t working.

Is 5V applied to the IC501 Pin99?

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

No OSD or F.OSD display.

Is 5.3V applied to the IC501 Pin53?

Does oscillation occur at the IC501 Pins44, 45?

Replace the IC501.

The I2C waves don’t come out.

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

Replace the IC501.

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)

Refer to “SMPS 5.3VA Trouble Shooting”.

YES

2. SERVO CIRCUIT

(4) KEY doesn’t working

3-11

5. Y/C CIRCUIT

(1) No Video in EE Mode,

No Video in EE Mode

Check the Tuner Pin16V

Check the SW 5V, 5.3VA Line.(Power Circuit)

Is I2C BUS signal applied to the IC301 Pins73, 74?

Does the Video signal appear at the IC301 Pin15?

Is 5.0V applied to the IC301Pins4, 22, 47, 60, 84?

Does the Video signal appear at the IC301 Pin29?

Does the Video signal appear at the IC501 Pin52?

Does the Video signal appear at the IC602 Pin7?

Check the path of the signal between the IC301 Pin 29 and IC501 Pins50.

Is there Vcc 5V on the IC602 Pin6

Does the Video signal appear at the IC602 Pin1(DVD MODE)

Replace the IC602.

Check the 5V. (Power Circuit)

Check the C327.(AGC)

Check the System Circuit.

YES

3-12

3. Y/C CIRCUIT

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

Is 5.2VT, 5.3VA applied to the IC301 Pins22, 47, 60, 84?

Is the Y/C Bus siganl applied to the IC301 Pins73, 74?

Does the normal RF signal appear at the IC301 Pin 6?

Check the SW 5V Line. (Power Circuit)

Check the System Circuit. (IC501 Pin18)

Check the V.H.S/W level. (Check R328)

Check the IC301

Refer to ‘SYSTEM I2C BUS CHECK Trouble Shooting’.

Is the V.H.S/W signal applied to the IC301 Pin70?

Is V.H.S/W “H” about 3.4V at the IC301 Pin 80?

Clean the Drum.

Check the path of the Y(Luminance) RF signal. (C337, C340)

Does the Y(Luminance) signal appear at the IC301 Pin9?

Is the Y(Luminance) Video waveform showed up at the IC301 Pin43?

Replace the IC301.

YES

3-13

3. Y/C CIRCUIT

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

Is 5.2VT/5.3VA applied to the IC301 Pins 22, 47, 60, 84.

Is the Color signal applied

to the IC301 Pin 57?

Check the SW 5V, 5.3V Line. (Power Circuit)

Replace the X301.

Check the Color Pass.

Is normal the X301 (3.58MHZ) of oscillation Frequency?

Replace the IC301.

Does the Color signal appear at the IC301 Pin55?

Replace the IC301.

YES

3-14

3. Y/C CIRCUIT

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

Is the EE signal normal?

Is 5.2V/5.3VA applied to the IC301 Pins 4, 22, 47, 60, 84?

Does the REC RF signal appear at the IC301 Pin76?

Check EE Mode.

Check the system of REC”H”(IC501 pin74)

Replace the IC301.

Check the SW 5V/ 5.3VA Line.(Power Circuit)

Check PB Mode.

Does the REC “H”(4V~5V) signal appear at the Q303, Q307 Base?

Check the REC Luminance Pass and Color Pass.

Does PB Mdoe operate normally?

YES

Does the REC RF signal appear at the IC301 Pins86, 90?

Check the Drum & Drum Connector.

YES YES

YES

3-15

6. Hi-Fi CIRCUIT

(1) No Sound(EE Mode)

YES

No Sound.

Check the SIF.IN of IC801 Pins57.

Check the DVD Audio of IC801 Pins12, 74.

Check the AV1 Audio of IC801 Pins11, 73.

Check the AV2 Audio of IC801 Pins9, 71.

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

YES

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 the JK601.

Check the TU701 SIF Pin13.

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

Check the Rear Jack. (JK601 Audio in).

Check the front Jack. Timer (JK602, JK603).

Check the Power 5.2V, 5.3VA, REG 9V. Q701, PMP01 Pins1, 2, 5, 6.

YES

Check the IC501 Pins71, 72.

Replace IC801.

Replace C804, C854.

3-16

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 JK601?

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(JK801)

Check C801, C851, R801, R851.

YES

3-17

(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 pins4,5 (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(AVI.A.), 9, 71(AV2.A.)

Check C825, C306, R311, R312, R346.

Check REC OSC BLOCK (FL301, Q301~Q305, Q308, Q309)

Is “High” IC501 Pin74 in REC mode.

3-18

7. Tuner/IF CIRCUIT

(1) No Picture on the TV screen

No picture on the TV screen

Does the Video signal at the TU701 Pin16.

YES

YES YES

Is +33V applied to TU701 Pin14?

YES

Is +5V applied to TU701 Pin3?

Does the Video signal at the IC501 Pin 52.

Does the Video signal at the IC609 Pin 23.

YES

Check the signal flow from IC609 Pin23 to JK901 Pin Video out.

YES

Check 33V line.

Check 5V line.

YES

Does the Clock signal appear at TU701 Pin9?

Check the lIC Clock Signal of µ-COM Pin71.

YES

Does the data signal appear at TU701 Pin10?

Replace Tuner.

Check the signal from IC301 Pin29 to IC501 Pin50.

Check the signal from IC501 Pin52 to IC609 Pin4.

Check the lIC Data Signal of µ-COM Pin72.

3-19

(2) No Sound

No Sound.

Check the Vcc of TU701 Pins3, 14.

YES

Check 5.2V, 33V Line.

Check the Tuner SiF signal at IC801 Pin57.

YES

Check the Audio of IC801 Pins78, 80.

YES

Check the Signal flow from IC801 Pins78, 80 to JK901 Audio out(L), (R)

YES

Check the Tuner SIF of TU701 Pin13.

1. Check the Vcc(5.3VA, 9V) of IC801 Pins3, 5, 36, 54.

2. Check the IIC Clock and Data at IC801 Pins37, 38.

3-20 3-21

BLOCK DIAGRAMS

1. POWER(SMPS) BLOCK DIAGRAM

BD101

T101

TRANS

R101

BR BL

(BK)(WH)

C103

FUSE

(F101)

NOISE FILTER

BLOCK

(C101,L102,

C102)

PHOTO COUPLER

(IC102)

ERROR

AMP

(IC103)

SNUBBER

BLOCK (D101,C105 C106,R104)

DRIVE & S/W BLOCK

(IC101, D102, R105,

C104, C109 , C135)

Y-CAP

C111

Y-CAP

C110

FEED-BACK

BLOCK R112,R113, C133,R114.

R115,R116

R117)

RECTIFIER &

SMOOTING BLOCK

(D110,C123,C163,

R133,L122,C126)

RECTIFIER &

SMOOTING BLOCK

(D118,D112,C129,

C131,L124,L125)

RECTIFIER &

SMOOTING BLOCK

(D111,C127,L123,

C128)

RECTIFIER &

SMOOTING BLOCK

(D113,C132,R119)

CAP VCC

D115

D117

DRUM VCC

12V

5.3VA

3.3V

33V

12V REG BLOCK

(Q156,ZD103,C151,

R150,R153,C152)

8V REG BLOCK

(D114,IC151,R170,

C154,C159)

5V S/W BLOCK

(Q160,C155,D121,

R157,R158,R159,R160)

3.3V REG BLOCK

(IC152,C153,R156)

33V S/W BLOCK

(Q161,R154,R155,

R177)

5V S/W BLOCK

(Q163,C162,R173,

Q164)

PWR CTL'H'

SW5V

9V REG BLOCK

(Q165,ZD171,C171,

R174,R175,R176)

PWR CTL BLOCK

(Q162,C161,R164,

R163)

657 8

DVW-7000

3-22 3-23

2. TU/IF BLOCK DIAGRAM

A.IN

CH S/W

REG 5V

CONTROL

V.IN

RF AGC

ENABLE

CLOCK

DATA

AFT

A.OUT

SIF

TU 30V

V.OUT

999 GND

100AFT

732TU.V.OUT

875 MOD A.IN

61 MOD CTL

107 5V

26 VCR 'H'

971 MOD VEDIO

71 IIC CLK

72 IIC DATA

781 SIF OUT

DVW-7000

15833V

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