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

(C) 0.286 V (p-p) 75 ohms

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

A

5

4

3

2

1

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

1

2

3

4

5

6

7

8

9

10

11

12

1

2

3

4

5

6

7

8

9

10

11

12

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

1

2

3

4

5

6

7

8

9

1

2

3

4

5

6

7

8

9

PPM01 PMP01

24VA

GND

14VA

GND

5.3VA

33VA

GND

4VA

1

2

3

4

5

6

7

8

1

2

3

4

5

6

7

8

PMD01 PMD02

Vcc(HF)

RF

DVD_LD

DVD_PD

VOL(DVD)

GND

VC_INPUT

Vcc(HF)

F

E

A

D

C

B

F(+)

T(-)

T(+)

F(-)

Vcc

GND

CD_LD

CD_PD

VOL(CD)

123456789

10111213141516171819202122

23

123456789

10111213141516171819202122

23

PMD03

SPM +

SPM -

FM +

FM -

LM -

LM +

SW(OPEN)

SW(CLOSE)

GND

SW(LEAD IN)

GND

123456789

10

11

123456789

10

11

P3D02

CTL(+)

CTL(-)

A/E(+)

A/E(-)

A.REC

A.PB

1

2

3

4

5

6

1

2

3

4

5

6

GND

FULL ERASE

P3D03

1

2

1

2

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

NO

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?

NO

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”?

NO

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

NO

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?

NO

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.

NO

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

YES

NO

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

NO

(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.

NO

YES

NO

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,

NO

YES

When the Capstan Motor doesn’t run,

Does 12VA appear at the PMC01?

YES

Replace the IC501.

YES

NO

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.

NO

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

NO

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

NO

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.

NO

YES

NO

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.

NO

YES

NO

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

NO

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.

NO

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

NO

Check the Rear Jack. (JK601 Audio in).

NO

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

NO

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

YES

NO

Check the IC501 Pins71, 72.

NO

Replace IC801.

Replace C804, C854.

NO

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.

NO

Check IC501 Pin19 (A.H/SW)

NO

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

NO

Check the Connection at P3D01 Pins7, 9.

NO

Check the Jack(JK801)

NO

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.

NO

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.)

NO

Check C825, C306, R311, R312, R346.

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

Is “High” IC501 Pin74 in REC mode.

NO

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?

NO

Does the Video signal at the IC501 Pin 52.

NO

Does the Video signal at the IC609 Pin 23.

YES

NO

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

YES

Check 33V line.

NO

Check 5V line.

NO

YES

Does the Clock signal appear at TU701 Pin9?

Check the lIC Clock Signal of µ-COM Pin71.

NO

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.

NO

3-19

(2) No Sound

No Sound.

Check the Vcc of TU701 Pins3, 14.

YES

Check 5.2V, 33V Line.

NO

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.

NO

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

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

NO

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

8V

5.3VA

5V

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

9V REG BLOCK

(Q165,ZD171,C171,

R174,R175,R176)

PWR CTL BLOCK

(Q162,C161,R164,

R163)

657 8

2

31

DVW-7000

3-22 3-23

2. TU/IF BLOCK DIAGRAM

A.IN

CH S/W

REG 5V

CONTROL

V.IN

RF AGC

NC

ENABLE

CLOCK

DATA

AFT

A.OUT

SIF

TU 30V

NC

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

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

DVW-7000

15833V

3-24 3-25

3. Y/C BLOCK DIAGRAM

+

28

51

49

53

98

73 6574

80

85

86

87

899190

83

IC301

HA118725

76 77

10

67 69

29

30

3640383733 34

31

32

57 45 43 42 46

55

EP CH1

EP CH2

V. OUT

(TO u-COM)

D-V SYNC

(FROM u-COM)

System

Y-CCD

C-CCD

CLOCK Drive

LPF

REC-AMP

SP CH2

REC-AMP

SP CH1

REC-AMP

EP CH2

REC-AMP

EP CH1

DATA

(FROM u-COM)

System

CLOCK

(FROM u-COM)

System

V.H/SW30

(FROM u-COM)

V.ENV

(TO u-COM)

System

SP CH1

SP CH2

Serial Cont

interface

X-tal

VCO/OSC

TRAP

629K

FM AGC P.EQ G.EQ D LIM Y LPF

Main

De-Empf

DEMO

S LPF

2M LPF

ACC

CTL Trap

fh Trap

HIFI Trap

C LPF DEALY

MIX

AMP

6dB

AMP

C-

SQUELCH

SQUEL CH

CLEAR

SYNC

CLAMP

Sharpness

CONTROL

YNR NC

SYNC SEP

C-SYNC

(TO u-COM)

System

NL

De-eMPH

VCA

C.K

LPF

BDBPF

CCD LPF

APC/ACC

DET

L- DET

Main

Conv2

Main

Conv1

FBC

Video ALC

(PB Mode)

+

++++

28

29

51

49

53

55

46

19

15 17 18 36 40 38 37 23 26 31 14 9 8 11

LINE 2 VIDEO IN

LINE 1 VIDEO IN

TV VIDEO IN

57

45 7365 74 6967

80

85

86

87

+

12

DVD VIDEO IN

89

91

90

ATT

-10dB VIDEO

AGC

CLEAR

SYNC

V. OUT

(TO u-COM)

D-V SYNC

(TO u-COM)

System

Y-CCD

C-CCD

CLOCK Drive

6dB

AMP

FBC

Video ALC

SQUEL CH

ATT

-10dB

C-SYNC

(TO u-COM)

ATT

-10dB

LPF

AGC DET

CLAMP

YNR

CLAMP

SYNC

SEP

D.E.

C-LPF 2

SPFACC

HPF

C-LPF 1

NL Emph

REC FILTER

LPF

VCA

629K

TRAP

FBC

ALC

Main

Conv2

Main

Conv2

APC/ACC

DET

Main

Emph

FM

MOD

REC

Trap

REC-AMP

SP CH2

REC-AMP

SP CH1

REC-AMP

EP CH2

REC-AMP

EP CH1

MIX

ATT

B.E

C.K

CCD

LPF

L-DET

JCA

(-4dB)

f0=1.68M

f/0DEV

Adjst

X-tal

VCO/OSC

Serial Cont

interface

DATA

(FROM u-COM)

System

CLOCK

(FROM u-COM)

System

V.H/SW30

(FROM u-COM)

System

SP CH1

SP CH2

EP CH1

EP CH2

IC301

HA118725

32

30

DVW-7000

(REC Mode)

3-26 3-27

4. NORMAL AUDIO BLOCK DIAGRAM

IC301

HA118725NF

SIF

A_IN

RF_MOD

IC801

LA72670BM

TUNER

TU701

10

76

DET

NORMAL

AUDIO

OUT

LINE AUDIO(R) IN

LINE AUDIO(L) IN

REAR JACK

REAR Jack

A. OUT (L)

ALC

SIF

DE MOD

INPUT

SELECT

OUTPUT

SELECT

4

6

13

1

57

9

2

71

117312

74

80

78

A. OUT (R)

DVD AUDIO

(System)

IC801

LA72670BM

IC301

HA118725NF

AMP

EQ

AMP

78

410

A. OUT (R)

MOD. OUT

DATA

CLOCK

R/P HEAD

N.A.IN

53

ENA

55 54

5

4

6

From u-COM

80

A. OUT (L)

2

OUTPUT

SELECTOR

EQ

3

2

SIF

DE MOD

INPUT

SELECT

OUTPUT

SELECT

IC301

LA71206M

SIF

IC801

LA72670BM

TUNER

TU701

10

76

DET

NORMAL

AUDIO

OUT

LINE AUDIO(R) IN

LINE AUDIO(L) IN

REAR Jack

A. OUT (L)

REC

AMP

4

6

13 57

RF MOD.

A_IN

1 2

9

71

80

78

A. OUT (R)

DVW-7000

ALC

9

(EE Mode) (PB Mode) (REC Mode)

3-28 3-29

5. Hi-Fi BLOCK DIAGRAM

A

B

Hi-Fi/

REC

IC801 LA72670BM

A.OUT

To JACK

MODULATOR

A.OUT (To Tu)

24

Hi-Fi PB 'B'

Hi-Fi PB 'A'

Hi-Fi REC

57

12

74

11

73

9

71

6 4

26 27

80

A.OUT 'L'

A.OUT 'R'

78

3

AUDIO INPUT

BLOCK

NORMAL AUDIO

OUT(To AVCP)

NORMAL AUDIO

IN(From AVCP)

SIF

DVD A.IN 'L'

DVD AUDIO

DVD A.IN 'R'

AV1 A.IN 'L'

AV1 A.IN 'R'

AV2 A.IN 'L'

AV2 A.IN 'R'

DVW-7000

REAR JACK

FRONT

FM MODU

DE MODU

DEMO

DULATE

INPUT

SELECT

OUTPUT

SELECT

3-30 3-31

6. SYSTEM BLOCK DIAGRAM

GND

MODE S1 MODE S2 MODE S3 MODE S4

MODE S/W

TO/FROM AVCP

T-UP REEL

T-UP END

SUP REEL

CST.SW/REC TAP

5V

CS501

5.3VA

ES501

R550

LD501 DECK IR LED

R553

R555

RS501

RS502

R556

R558 C582

R538

R535

R537

R536

C534

R544

C552

R5C6

C500 C517

R541

R529

R583

L512

MS501

X502

14MHz

32.768KHz

OSC

X501

1

2

RESET

GND

Vcc

3

5.3VA

5V

IC504

+

+ +

C592

+

C503

L501

R557

SUP END

ES502

C535

R564

R531

OSC

R/C

RC601

L511 R598 C595 C596

+

C561

TO/FROM DECK

Q503

Q501

CV IN

25

24

23

22

21

79

58

80

88

49

40

37

98

34

IC501

M37760

MODE S1

I-Limit

MODE S2

MODE S3

MODE S4

T-UP Sensor

T-UP Reel

SUP Reel

CST IN

Vss (AMP)

Vss (OSD)

Vss (SYSCON)

Vcc

(SYSCON)

Vcc

(SERVO)

CAP. PWM

CTL +

CTL -

CFG

CAP. REV 'H'

LD CTL

V. ENV

V.H.SW30

DPG

D.V.Sync

38

39

X out

Xc in Xc out

X in

35

36

44

OSC in 2

95

94

87

12

60

9

18

76

90

13

H.A.SW

SQPB

16

59

56

77

11

DRUM PWM

53

Vcc (OSD)

20

SUP Sensor

45

OSC out 2

14

99

Vcc (A/D)

TO/FROM AUDIO(Hi-Fi)

TO/FROM DVD

TO/ FROM TU/IF

72

100

26 61

VCR 'H'

MODU CTL

PLL DATA

PLL CLK

CV OUT

AFT

71

52

POWER FAIL

78

A. MUTE 'H'

A. ENV

A. H.SW

REC 'H'

74

68

71 72

CLK

DATA

74

50

COMP IN

17

REC 'H'

15

C.ROT

84

A.MUTE'H'

S clk

S in

S out

DVD DATA OUT

DVD DATA IN

DVD CLK

DVD RESET

DVD ENA

8

19

67 66 65

65 66 67 82 85

Hi-Fi ONLY

2

GND

Vcc

3

IC505

1

IC5F1

OSC

DISPLAY

DVW-7000

3-32 3-33

NOTES) Symbol denotes AC ground.

NOTES) Symbol denotes DC chassis ground.

NOTE) Warning

NOTE) Parts that are shaded are critical NOTE) With respect to risk of fire or NOTE) electricial shock.

SR14370A

DVW-7000

(DVW-7000 Without)

CIRCUIT DIAGRAMS

1. POWER(SMPS) CIRCUIT DIAGRAM 1

Switching Error. IC101 is defective.

Switching Error. IC103, 102 are defective.

2.5V, 3.3V no power. D111 is defective.

No Power. F101 is defective.

5.3VA no power. D112 is defective.

33V no power. D113 is defective.

No power. BD101, R101 are defective.

12VA no power. D110 is defective.

IMPORTANT SAFETY NOTICE

WHEN SERVICING THIS CHASSIS, UNDER NO CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN BE MODIFIED OR ALTERED WITHOUT PERMISSION FROM THE GO VIDEO ELECTRONICS CORPORATION. ALL COMPONENTS SHOULD BE REPLACED ONLY WITH TYPES IDENTICAL TO THOSE IN THE ORIGINAL CIRCUIT. SPECIAL COMPONENTS ARE

SHADED ON THE SCHEMATIC FOR EASY IDENTIFICATION.

THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER FROM THE ACTUAL CIRCUIT USED. THIS WAY, IMPLEMENTATION OF THE LATEST SAFETY AND PERFORMANCE IMPROVEMENT CHANGES INTO THE SET IS NOT DELAYED UNTILTHE NEW SERVICE LITERATURE IS PRINTED.

NOTE :

1. Shaded( ) parts are critical for safety. Replace only with specified part number.

2. Voltages are DC-measured with a digital voltmeter during Play mode.

3-34 3-35

2. POWER(SMPS) CIRCUIT DIAGRAM 2

SR14301A

DVW-7000

(DVW-7000 Without)

3-36 3-37

3. TU/IF CIRCUIT DIAGRAM

SR14305A

DVW-7000

PB

REC

3-38 3-39

4. A/V CIRCUIT DIAGRAM

1

2 4

7

3

6

3

9

12

13

8

59

10

11

WAVEFORM

Y. (REC) C. (REC) Y(PB)

Y/PB

C/PB

Y+C (PB)

C(PB)

Y+C (REC)

SR14303A

DVW-7000

R333, C350, C349 are defective.

No Color.

H/SW Level is defective..

Video Noise.

L307,C349 are defective.

No Color.

C323 is defective.

Video output level unstable

R322, R323, R324, C320 are defective.

VIDEO Distortion

3-40 3-41

5. Hi-Fi CIRCUIT DIAGRAM

SR14304A

DVW-7000

PB

REC

(DVW-7000 Without)

23 Pin is defective. Hi-Fi Audio is not appear.

IC801 Pins37, 38 aredefective.

All Audio is not appear.

3-42 3-43

6. JACK CIRCUIT DIAGRAM

(DVW-7000 Without)

SR14306A

DVW-7000

3-44 3-45

7. SYSTEM CIRCUIT DIAGRAM

1

3

48 5 6

7

2

WAVEFORM

SR14302A

DVW-7000

Q501, Q503 are defective.

µ-COM is unstable.

IC505 is defective.

VCR will not operate.

X501 is defective.

CLOCK SETTING will not operate.

X502 is defective.

µ-COM will not operate.

ES501, ES502, LD501 are defective.

Auto Rew will not working. RS501,RS502 are defective.

Auto stop occures.

R575, R576, R577, R578 are defective.

Deck will not operate.

3-46 3-47

* IC501 Waveform

Tek Stop : 10.0KS/s

280 Acqs

M5.00ms Ch1Ch1 3.04 V1.00 V

T

1

Tek Stop : 250KS/s

299 Acqs

M 200µs Ch1Ch1 3.04 V1.00 V

T

1

Tek Stop : 10.0KS/s

18 Acqs

M 5.00ms

Ch1

3.04 V

Trigger Position: 12%

1.00 V

T

1

T

Tek Stop : 10.0KS/s

27 Acqs

M5.00ms Ch1Ch1 3.04 V1.00 V

T

1

Tek Stop : 10.0KS/s

35 Acqs

M5.00ms Ch1

Ch1

3.04 V1.00 V

T

1

Tek Stop : 50.0KS/s

120 Acqs

M1.00ms Ch1Ch1 3.04 V1.00 V

T

1

T

Tek Stop : 5.00KS/s

2 Acqs

M 10.00ms

Ch1

340V

Trigger Level: 340mv

500mV

T

1

IC501 Pin 18 REC/PB

IC501 Pin 13 QUE/REV

IC501 Pin 95 REC

IC501 Pin 87 REC/PB

IC501 Pin 90 REC/PB (DPG/DFG)

(DPG)

(DFG)

IC501 Pin 97 PB (CTL OUT)

IC501 Pin 94 REC

• WAVEFORMS

* IC301 Waveform

IC301 Pin 9 100mV/10msec DIV VV/EE (Main De-Emphasis out)

IC301 Pin 12 100mV/10msec DIV PB (Main De-Emphais

Peacking)

IC301 Pins 33, 36, 37 100mV/10msec DIV VV/EE Clamp Drive IN Pin 33 Y-out(to 1H CCD) Pin 36 Y-out(from 1H CCD) Pin 37

IC301 Pin 15 200mV/10msec DIV EE (VIDEO IN)

IC301 53 Pin 100mV/0.2msec DIV REC/PB (2fsc)

IC301 31 Pin

1.0V/20msec DIV VV/EE (C-SYNC OUT)

IC301 29 Pin 500mV/10msecDIV VV/EE (VIDEO OUT)

IC301 Pin 43 200mV/20msec DIV PB (C.OUT)

IC301 Pins 46, 57 200mV/20msec DIV VV/EE from 1H CCD Pin 46 to 1H CCD Pin 57

IC301 Pin 67 100mV/0.2msec DIV PB/REC (3.58MHz X-TAL IN)

IC301 Pin 77 100mV/5msec DIV PB (PB RF out)

IC301 Pin 86 500mV/2msec DIV SP REC (REC RF)

IC301 Pin 90 500mV/2msec DIV EP REC (REC RF)

3-48 3-49

• CIRCUIT VOLTAGE CHART

EE PLAY

MODE

PIN NO.

0.06

0.02

5.10

2.10

0.00

2.84

1.85

2.39

2.64

1.69

0.01

2.78

0.01

0.31

2.80

1.95

2.80

0.02

2.80

5.10

2.32

0.52

2.13

3.01

0.51

0.03

2.47

2.79

0.37

2.39

2.10

1.83

3.05

2.31

3.04

0.00

2.49

2.09

2.49

2.13

0.01

3.12

5.05

4.92

3.28

5.05

2.03

5.05

2.61

0.01

0.00

0.06

0.01

5.15

2.61

2.54

2.84

1.35

1.34

1.90

3.04

0.01

2.40

0.01

1.92

2.80

1.89

2.80

0.01

2.80

5.14

2.34

0.88

2.13

2.81

0.92

0.03

2.38

2.89

0.23

2.82

2.15

3.14

2.54

2.39

3.13

2.18

1.45

2.12

2.66

2.14

0.01

3.15

0.00

4.97

3.33

5.10

2.11

5.10

2.63

0.01

EE PLAY

MODE

PIN NO.

1.99

0.01

2.18

2.30

4.95

0.03

1.19

2.35

2.61

2.26

2.61

1.39

1.28

1.98

2.30

1.60

2.50

5.25

2.17

2.84

0.03

0.01

2.50

5.05

2.29

2.47

0.01

5.02

0.03

5.06

2.05

2.55

2.53

0.02

2.27

0.01

2.57

0.97

5.17

0

0.5

0

0.4

0.19

2.02

0.01

2.18

1.91

4.99

5.00

0.03

1.19

2.35

2.61

2.26

2.61

1.39

1.28

1.98

2.30

1.60

2.50

5.25

2.17

0.03

0.01

2.50

5.05

2.29

0.01

2.28

5.11

2.54

2.52

2.50

0.01

2.55

0.01

2.54

0

5.17

5.16

0

0.54

0

0.42

4.06

IC501

EE PLAY

MODE

PIN NO.

0.29

0.68

0

4.78

0

0.68

2.56

2.57

0

0.11

5.17

]5.17

5.17

0

5.13

0

5.15

1.52

1.43

5.15

2.19

2.28

0

0.51

0.26

2.35

2.41

0

1.29

0

1.88

0.53

1.88

4.96

2.03

2.6

1.96

0

2.57

0

3.91

0.99

3.42

0

4.78

2.57

0

0.43

2.57

0

0.11

5.17

0

5.13

5.17

5.13

0

5.15

1.51

1.44

5.15

2.18

2.27

0

0.55

0

2.34

2.41

0

1.99

0.57

1.98

4.95

2.03

1.92

2.05

0

2.58

4.28

0

EE PLAY

MODE

PIN NO.

0

0.97

2.38

5.07

4.7

5.02

4.75

5.17

0

4.94

5.03

0

2.69

0.58

0.17

0

0.54

0.1

2.53

2.54

0.21

2.5

2.52

5.08

5.17

2.64

5.19

0

5.14

5.19

0

4.7

0

2.56

9.21

2.48

5.19

1.91

0

0.29

0

0.86

0

5.07

4.45

4.97

4.61

5.17

0

1.79

2.72

4.76

0

4.94

4.98

0

2.67

0.68

2.36

0

1.36

2.54

2.53

0

2.49

2.52

5.08

5.17

1.95

5.19

0

5.14

5.19

0

4.7

0

2.54

9.18

2.48

5.19

2.07

0

1.31

0

IC504

IC505

IC801

EE PLAY

MODE

PIN NO.

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

0

2.5

1.91

2.49

5.06

2.51

0

2.51

2.52

2.51

0.19

2.25

0

2.24

2.25

0

2.48

0

2.51

5.02

2.64

0

5.06

5.17

0

0.19

2.52

2.51

2.52

0

5.06

2.49

1.9

0

2.05

1.22

3.86

9.2

6.26

1.96

2.2

4.56

2.52

3.86

3.15

4.02

3.83

2.45

0

2.5

2.44

2.49

5.05

2.51

0

0.86

2.44

2.45

2.43

2.42

3.66

2.3

0

2.3

0

0.11

1.34

3.79

5.01

2.65

2.64

0

5.05

5.17

2.57

0

2.45

2.43

2.45

0.25

5.05

2.49

2.42

0

2.06

0

0.25

9.19

0.28

0.29

2.15

0

2.35

0.23

0.24

0

EE PLAY

MODE

PIN NO.

3.87

4.09

3.88

3.94

0

3.86

0

2.5

3.87

3.17

0

4.42

0

4.4

0.32

0.31

0

0.31

0

2.5

0.4

0.22

0

4.3

0

4.3

IC301

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

1

2

3

1

2

3

1

2

3

4

5

6

7

8

9

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

EE PB EE PB

Base Emitter Collector

PB EE

Location

No.

Q301

Q302

Q303

Q304

Q305

Q306

Q307

Q309

Q501

Q503

Q504

Q505

Q506

Q507

Q805

Q701

Q702

0.25

4.4

0.01

4.7

-28

4.7

0.68

5.17

2.82

1.58

5.07

2.8

2.56

9.02

4.98

0.01

5.1

0.01

pulse

0 0

pulse

2.2

0

4.48

2.27

2.24

0

3.23

2.08

9.81

5.7

0.25

5.1

0.02

-28

-0.015

0

4.6

0

5.15

4.95

4.96

0

5.06

12.58

5.19

0.2

0.3

5

0

pulse

0

pulse

5.15

4.95

4.96

3.29

0

5.05

12.99

5.19

0.2

5.2

0.025

4.4

0.7

0.025

1.5

0.68

5.17

2.94

1.58

0

2.6

2.56

9.24

4.97

-0.01

5.1

4.7

-24

5.1

0

4.48

2.18

1.03

0

2.08

9.82

5.7

PRINTED CIRCUIT DIAGRAMS

1. MAIN P.C.BOARD

LOCATION GUIDE

3-50 3-51

3-52 3-53

2. MAIN P.C.BOARD

LOCATION GUIDE

3-54 3-55

2. POWER P.C.BOARD

LOCATION GUIDE

NOTES) Warning

NOTES) Parts that are shaded are critical NOTES) With respect to risk of fire or NOTES) electricial shock.

3-56

DVD PART

ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS

1. System Clock X601 (27Mhz)

IC601

X601

MPEG (STI5589)

NORMAL

1) MPEG IC start oscilating after being installed VCC

ABNORMAL

1) Logo Picture doesn’t appear

2) Initial step fail * Initial step : power cord in -> green LED ->

red LED -> power key input -> Logo picture

6.5 Vp-p

X601 : 27 Mhz X601 : there is distortion

IC602 SDRAM

VCR Front µ-com

X601

MRESET

SMI_CLK

R693

IC601 MPEG (STI5589)

1) MPEG IC start oscilating(27Mhz)after being installed VCC

2) MPEG IC and RF IC get the MRESET signal from VCR front µ-com and they are initialized.

3) And then, MPEG IC generate SMI_CLK and send to SDRAM

4) MPEG IC and SDRAM are synchronized by SMI_CLK, they communicate between.

If oscilation(27Mhz) don’t appear, check The X-TAL and VCC and replace MPEG IC.

If SMI_CLK don’t appear, first cut the SMI_CLK line (remove R693) and recheck. Don’t appear -> check MPEG IC or replace Appear -> check the SDRAM or replace

/M-RESET

Reset Time

Power Cord in

X601

(27 Mhz)

SMI_CLK

(133 Mhz)

2. Initializing between MPEG and SDRAM

3-57

IC603

Flash ROM

IC501 Front µ-com

IC601 (27Mhz)

MRESET

WE

VCC

data

address

IC601

MPEG (STI5589)

1) MPEG IC start oscilating(27Mhz) after being installed VCC

2) MPEG IC is initialized by MRESET

3) MPEG IC send the WE(read/write) signal before communicating with FLASH ROM

WE signal should be confirmed by Flash or the next step will not continue.

As that result, the initial step(power cord in -> green LED -> red LED -> standby) will fail.

If WE signal doesn’t appear, check the VCC and replace the Flash ROM…

VCC

Power Cord in

MRESET

WE

3. Initializing between MPEG and Flash

VCC (3.3V)

V_REFD (2.1V)

9 PIN

10 PIN

IC202

DSP (STL6317)

1) There is one kinds of reference voltage on DSP IC

2) These are outputed from DSP IC and 2.1V is used as reference of Pick - up

If these reference voltage don’t appear, All kinds of servo control will fail.

So, should be checked first of all Check the DSP

IC and replace…

3) The reference voltage of DSP is 1.65V for inside of IC L6317, but we can cheek the voltage only by TP.

VCC

3.3V

2.1V

Power Cord in

V_REFD

4. Reference Voltage 1

3-58

IC202

(STL6316)

Pick-Up

Reference 2.1V

TacT Reference 2.8

F.E T.E

IC201

(L6560)

We can see how the reference voltage, mentioned previous page, will work on servo control..

1) The DC level of RF signal from P/up is 2.1V

2) The DC level of T.E and F.E is 1.65V

3) Correct DC level of these signal make servo work normally.

Even though, the reference voltage come out correctly from DSP,

If A/B/C/D are not biased by 2.1V, and checking the P/up is needed.

If the DC level of T.E is not 1.65V, check DSP and replace it… In case of FE, procedure is same

FE

1.65V

TE

A/B/C/D

1.65V

2.1V

5. Reference Voltage 2

LIMIT_SW

CD_LD

CLOSE_SW

FM+

M/D ASSY

PMD02 PMD03

IC202

(STL6317)

IC201

(L6560)

Let’s look over the initial action of M/D...

1) When the tray is closed, CLOSE-SW should be changed from 5V to 0V and DSP need to detect this change

2) Feeding Motor move the P/up to inner area until the LIMIT SW is detected

3) After DSP detect the LIMIT SW, CD laser is

turned on and go to the next step

4) if there is a DISC on the tray, the RF will be detected by the CD laser and go to next step..

Check the CLOSE-SW and LIMIT-SW

if anything of the both is not detected, the next step won’t go on. This means that even though there is a DISC on the tray the DISC will not rotate.

FM+

CLOSE-SW

P/up move to inner area

Limit sw

detect

CD_LD on

Tray close

LIMIT-SW

CD_LD

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

3-59

Check the followings

1) Check the video output mode. if the output mdoe is progressive - on, there is no composite signal. the output mode should be changed to progressive - off

2) Check the buffer IC and MPEG, and then replace.

Composite out

34 pin(IC601)

35 pin (IC601)

27 pin(IC601)

23Pin(IC609)

4Pin(IC609)

VCR Block

buffer

IC609

IC601 STI5589 (MPEG)

7. Checking the Video Signal

81

36

DSP-RST

PC[o]

IC202

DSP IC

IC203 MOTOR AMP IC

IC601 MPEG

Let’s look over the initial step of DSP

1) First. DSP IC receive the DSP - Reset from MPEG

2) This reset signal get DSP initialized and DSP is ready to do first step for servo

3) PC[o] from DSP is the test signal for checking the PLL- loop

4) after checking the PLL-loop, the second step is followed. the second step will be explained on next page…..

if PC[o] doesn’t appear, check DSP and

replace.

/DSP-Reset

Vcc(3.3V)

50ms

DSP Reset period

PC[o]

8. Checking the first step of servo (1)

3-60

M/D

ASSY

PMD03

IC202

(STL6317)

Let’s look over the initial step of servo

1) when the tray is closed, first of all, it should be checked whether there is disc or not on tray

2) CD laser is turn on and the lense is moved. if there is a disc on tray, RF signal will appear

3) next, it should be confirmed which disc is that. CD or DVD.

4) the following step will be done continuously CD Laser on -> move lense -> DVD - laser on -> move lense. in according to disc type, there will be RF signal…

5) after confirming disc, CD or DVD laser turn on and focus servo is executed…

the below picture is related signals when DVD disc is inserted

CD laser on

DVD laser on

PI CD/DVD

CD_LD

DVD_LD

4)

9. Checking the second step of servo (2)

DAC_PCMOUT3

DAC_PCM_CLK

DAC_SCLK

DAC_LRCK

Analog audio

IC601

MPEG

(STI5589)

AUDIO

2DAC

(PCM1742)

OP-AMPAnalog

Audio

Amplified

(MC4580)

IC401 is called as Audio DAC, DAC means DigitalAnalog Convertor.

This IC receives digital signal from MPEG and convert digital signal to analog signal, so we can hear sound…

IC401 is connected with OP - AMP and an analog Audio signal is amplified at the OP - A MP. because the analog audio signal from DAC is a very low level.

DAC_PCM_CLK : this is the system clock for

IC401

DAC_SCLK : this is standard clock to synchronize

the audio serial data

DAC_LRCK : R-chanel and L-chanel are selected

among the audio serial data by this

DAC_PCMOUT3 : serial audio data

DAC_PCM_CLK

DAC_SCLK

DAC_LRCK

ADAC_DATA

10. Checking the output of Audio signal

3-61

Pin 81 of IC202, pin 130, 193 of IC601 and pin 12 of IC603 are related to RESET.

We can know whether IC is intialized or not through those ports.

The waveform shows the status when the reset signal works normally.

If the MRESET is abnormal, then check the front u-com(IC501) and replace it

MRESET (Pin130 of IC601)

DSP_RST (Pin 81 of IC202)

3.3V power input

The waveform when power on

11. Checking the reset port

Waveforms as below are regarding focusing and tracking servo normally. FE and TE signal are generated in IC202 and output at pin55, pin54 and pin20 of IC202, respectively.

FE

IC202 Pin55

TE

IC202 Pin54

12. Checking the focus & tracking servo

3-62

TE and TACT signals are output respectively from pin 54 and pin 34 of IC 202 during a normal play.

SLED signal is output pin 29 of IC 202 and flow into pin 15 and pin 18 of IC 201 to operate a sled motor

when to skip chapters or to scan.

IC202

pin34

(TACT)

IC202

pin54

(TE)

IC202

pin29

(SLED)

IC202

pin34

(TACT)

IC202

pin54

(TE)

IC202

pin29

(SLED)

The waveform during a normal play The waveform when to skip or scan

13. Checking the track jump

This is the waveform of FE and collector outputs of Q205 and Q206 when to play DVD

Section A : CD_LD is ON and DVD_LD is OFF

Section B : DVD_LD is ON and CD_LD is OFF

This is the waveform of FE and collector outputs of Q205 and Q206 when to play CD

Section C : CD_LD is ON and DVD_LD is OFF Section D : CD_LD is OFF and DVD_LD is ON Section E : CD_LD is ON and DVD_LD is OFF

The waveforms as below indicate “COLLECTOR” outputs of Q205 and Q206, respectively when to play DVD and CD

IC202 pin55(FE)

Q205 COLLECTOR

Q206 COLLECTOR

IC201 pin15(SLED)

Q205 COLLECTOR

Q206 COLLECTOR

14. The status of CD_LD and DVD_LD in the PLAY MODE

3-63

The waveform is to display F+ siganal from pin 9 IC201 and SPM+ from pin 10 IC201.

F+ is used to control a focus actuator of pick - up and SPM+ is used to operate a spindle motor. So, we can know the position of the acuator and the speed and rotating direction of the spindle motor through those signals.

IC201 pin 9(F+)

IC202 pin 28(SPINDLE)

The waveform F+ and SPM+ in the PLAY Mode

15. The status Focus and spindle motor

This waveforms are showing “The Downloading serve program”.

The must important thein of the download process is the timing.

The servo program must be downloaded before the second DSP reset.

DSP_Reset(IC601 pin193 to IC201 pin81)

/MRESET(IC601 pin130)

IIC_DATA(IC601 pin201 to IC202 pin69)

DSP_Reset active Low

IIC_CK(IC601 pin202 to IC202 pin68)

16. DATA STREAM

3-64

C244 12p

C245 12p

R237 1M

X201

R2C9 220

86 87

IC202

(STL6317)

The waveform and the block diagram as below show a clock input and output between IC202 and X201.

Clocks generated in X201 is output and input into pin86 and pin87 of IC202.

The clock frequency is 20MHz.

IC 202

pin86

IC 202

pin87

A diagram for a colck input of IC201 The waveform of clock inputs to IC201

17. Input Clock to IC202

IC202

DSP(STL6317)

IC201

Driver IC(L6560)

Pin 38

Pin 39

Pin 1

Pin 2

Tray-open (LOPEN)

(LCLOSE)

Tray-close

MD

Pin 4

Pin 5

LM-

LM+

DSP send tray - open or tray - close signal to IC201(motor drive IC)

IC201 generates LM+ and LM - and transmits them to operate a loading motor.

if there is no LM+ or LM-, check the Tray-open and Tray-close. And replace the Motor Drive IC .

IC201

pin1

IC201

pin2

A signal flow for tray open and close The waveform input to IC201 for tray open and close

18. Tray Open and Close

3-65

IC202 (DSP)

IC201

(Driver IC)

Pin23

Pin24

Pin33 Pick-up

F-

F+

Pin8

Pin9

FACT

FACT is made from focus error signal at DSP(IC202) and is input to IC201.

And then FACT is converted into F - and F+ in IC201.

Finally, they are sent to pick - up to control a focus actuator.

IC202

pin33(FACT)

IC201

pin8(F-)

IC201

pin9(F+)

A signal flow for FACT The waveform of FACT, F- and F+

19. Focus Drive signal(FACT)

MRESET signal is output from VCR µ-COM when power is on, so IC501 is initialized.

And those(VCR µ-COM and IC501) communicate each other through DVD-DATA, DVD-CLK signals

Waveforms display each signal when power on and after power on

IC501 pin214

(FLD_CLK)

IC501 pin2

(FLD_D_

OUT)

IC501 pin215

(FLD_D_IN)

IC501 pin130

(MRESET)

IC501

pin214

IC501

pin2

IC501

pin215

IC501

pin130

The waveform when power is on The waveform after power on

20. Signals for Front micom

3-66

FE signal becomes like the waveform 2, in case of DVD dual layer disc since the laser

beam is reflected on both layer 0 and layer 1.

Layer0 Layer1

A

21. FACT and FE for DVD9 (Dual disc)

16

R691

IC606 Buffer IC

IC601

C642

C641

R600

X601

The waveform and the block diagram as below show a clock input and output between IC601 and X601.

Clocks generated in X601 is output and input into pin126 of IC601.

The clock frequency is 27MHz.

If this clock is abnormal or does not appear, replace the X-tal or MPEG IC

IC601

pin126

A diagram for a colck input of IC601 MPEG CLOCK

22. System clock of MPEG IC

3-67

BLOCK DIAGRAMS

1. DVD OVERALL BLOCK DIAGRAM

M

DISC

Spindle

Motor

Loading

Motor

OPEN S/W

CLOSE S/W

LIMIT S/W

DECK MECHANISM

Video Out

2ch Audio Out

VF+

AC IN

POWER

BOARD

VF-

-27V

+8V

+5.3VA

+5V

+3.3V-M1

IC401

PCM1742KE

AUDIO

2ch DAC

IC402

OP AMP

M64580

R

VIDEO

Y

Pr

POWER

CONTROL

IC201

L6560

Motor Driver

PICK

UP

IC202

STL6317

CD / DVD DSP

Pb

IC501

VCR U-com

FL DISPLAY

KEY Input

+12_A

DSP/MPEG(1.8 Regulator)

X501

32.768KHz

X-TAL

Memory Interface

Diagnostics Controller

Frontend

Interface

IC602

SDRAM

64Mbit

16bit x 4

Micro

Processor

Video Encoder

& DAC

Super Jack

IC609

MM1623

VIDEO FILTER / BUFFER

IC603

8M

Flash

Memory

X201

20 MHz

X-TAL

ADAC-ENA_2CH

DAC_PCMOUT3

ADAC_DATA

ADAC_CLOCK

DAC_RST

DAC_SCLK

DAC_LRCK

DAC_PCM_CLK

RC501

Remocon

Receiver

Remote

Controller

Power-Control

+3.3V

MPEG(1.8 Regulator)

RF IC/Pick-up/Motor Drive/MD/Audio ADC/DAC

Front U-com/Buffer IC/Reset IC

Audio OP AMP

Motor Drive IC

VCR U-com

IC604

74HCT244

Level Shift

RF Signal A/B/C/D/E/F

LM+, LM-

M

Feeding

Motor

FM+, FM-

FACT

TACT

Actuator mute

Spindle on

Vref

PC(O)

Loading Control

DVD_LD, CD_LD

F+/F-/T+/T-

SPM+, SPM-

PSEL0, PSEL1

IC203

NJM3414

FG Generation

Block

Audio DSP

IC601

STI5589

MPEG DECODER

X601

27 MHz

X-TAL

DSP_RST

IRQ2

IIC_DATA

IIC_CLK

RS_ECCB_START

RS_DATA

RS_DVALID

RS_BCLK

RS_ERROR_EN

RS_ERROR

CVBS

C (for S-Video)

Y (for S-Video)

Y/G (Component Video)

Pb(B) (Component Video)

Pr(R) (Component Video)

SMI_CS[0:1]

SMI_RAS

SMI_CAS

SMI_WE

SMI_DQML

SMI_DQMU

SMI_CLKIN

SMI_CLKOUT

SMI_DATA[0:15]

SMI_ADR[0:13]

Top BOOT

CPU_ADR[1:21]

CPU_DATA[0:15]

FLASH_CE

FLASH_OE

WE

L

Digital Audio Out

Coxial

Optical

SPDIF

DVD_CLK

/FLD_CS

DVD_DATA

/MRESET

VCR_DATA

MPEG Decoder

Sub-picture

OSD

Audio Decoder

X502

14.31818MHz

X-TAL

To VCR BLOCK

VIDEO SIGNAL

DVW-7000

3-68

DISC

PICK UP

CD : A/B/C/D/E/F DVD:A/B/C/D

LM

+, LM-

FM+, FM-

DVD_LD,_CD_LD

F+/F-/T+/T-

Loading

Motor

M

Spindle

Motor

Feeding

Motor

M

SPM+, SPM--

OPEN S/W

CLOSE S/W

LIMIT S/W

VR-DVD

VR-CD

PSEL0

PSEL1

V_REFD

IC601

STI5589

MPEG DECODER

DSP_RST

IRQ2

IIC_DATA

IIC_CLK

RS_ECCB_START

RS_DATA

RS_DVALID

RS_BCLK

RS_ERROR_EN

RS_ERROR

Frontend

Interface

(sector processor

CPRM,

DVD decryption)

Memory Interface

Diagnostics Controller

Micro Processor

ST20

MPEG Decoder

Sub-picture

OSD

Audio Decoder

Video Encoder

& DAC

Audio DSP

IC202

STL6317

CD / DVD DSP

Input stage

Laser

Control

Channel

Processing

Mpeg decoder

Interface

Motor

Actuator

Control

Servo

Processing

IC203

NJM3414

FG Generation

Block

FACT

TACT

Actuator mute

Spindle on

SLED

LOPEN

LCLOSE

PDM

MPD

PC(O)

DVW-7000

IC201

L6560

Motor Driver

2. SERVO BLOCK DIAGRAM

3-69

3. MPEG Block Diagram

VCR

JACK BLOCK

INTERFACE

DSP

I/F

IC601

STI5589

MPEG DECODER

IC602

SDRAM

64Mbit

16bit

IC603

8M

Flash

Memory

SMI_CS[0:1]

SMI_RAS

SMI_CAS

SMI_WE

SMI_DQML

SMI_DQMU

SMI_CLKIN

SMI_CLKOUT

SMI_DATA[0:15]

SMI_ADR[0:13]

CPU_ADR[1:21]

CPU_DATA[0:15]

FLASH_CE

FLASH_OE

WE

ADAC-ENA_2CH

DAC_PCMOUT3

ADAC_DATA

ADAC_CLOCK

DAC_RST

DAC_SCLK

DAC_LRCK

DAC_PCM_CLK

2DAC

INTERFACE

SPDIF

DSP_RST

IRQ2

IIC_DATA

IIC_CLK

RS_ECCB_START

RS_DATA

RS_DVALID

RS_BCLK

RS_ERROR_EN

RS_ERROR

PROGRE_L

16/9

D2-T1

D2-T2

D2-T3

AMUTE

CVBS

C (for S-Video)

Y (for S-Video)

Y/G (Component Video)

Pb(B) (Component Video)

Pr(R) (Component Video)

Frontend

Interface

(sector processor

CPRM,

DVD decryption)

Memory Interface

Diagnostics Controller

Micro Processor

ST20

MPEG Decoder

Sub-picture

OSD

Audio Decoder

Video Encoder

& DAC

Audio DSP

DVW-7000

3-70

4. AUDIO Block Diagram

IC401

PCM1742KE

AUDIO

2ch DAC

L

R

L

R

MPEG

I/F

To VCR

Hi-Fi/Jack Block

IC402

MC4580

OP AMP

LPF & Buffer

DAC_SCLK

DAC_LRCK

DAC_PCM_CLK

ADAC_CLOCK

ADAC_DATA

ADAC-ENA_2CH

DAC_PCMOUT3

DVW-7000

3-71 3-72

FOCUS SERVO LOOP

TRACKING SERVO LOOP

SPINDLE SERVO LOOP

SLED SERVO LOOP

SR14308A

DVW-7000

DISC detect error

Test pin for check spindle speed

Reference voltage for pick up

Motor drive IC

Plup, Spindle, Loading Motor not work

Tray open/close

RF Amplified & Filtered

RF Amplified

DVD reading fail

CD reading fail

The final signal for RF

Servo DSP IC

F. E

Find best point for Tracking & focusing servo

DSP initializing signal

-servo is not work

Interface line with MPEG IC

T. E

CIRCUIT DIAGRAMS

1. RD SERVO CIRCUIT DIAGRAM

3-73 3-74

2. SYSTEM CIRCUIT DIAGRAM

SR14307A

DVW-7000

Compooonent Video Loop

Video Loop

Digital Audio Loop

Invertor IC

DSP Reset

Main Servo data and clock

1.8V Regulator

Video Buffer IC

SDRAM 64M

Ligo picture will not display

MPEG IC

1. Initial Function

2. Video output

3. Audio output

Level shuf IC

Initial Function will be abnormal

Flash ROM

Servo program downlosd

µ-COM Program

download connector

Main Reset from

VCR µ-com

X-TAL

27MHz

EEPROM

Not used

3-75 3-76

3. AUDIO CIRCUIT DIAGRAM

SR14309A

DVW-7000

2CH L

2CH R

2Ch Audio digital to Analog convertor

OP Amp for Amplifying Audio Siganl

Transistor for zero mute

Audio mute be send to VCR

Serial Interface with main µ-com (MPEG IC)

2Ch Audio DATA

3-77 3-78

STOP PLAY

MODE

PIN NO.

0.02

8.04

0.02

2.85

2.84

1.67

8.03

2.71

0

2.74

0.59

2.94

2.8

0.59

2.95

2.81

0.59

7.51

4.94

0.6

4.93

2.76

0.23

2.81

2.96

0.02

3.3

0.01

0.02

0

8

0.03

0

2.7

2.93

2.7

2.93

2.72

2.92

1.64

8.04

2.95

0.01

0

0.02

8.01

1.25

0.03

3.65

3.6

3.64

3.61

4.92

2.32

3.59

3.71

8.01

2.72

0.01

0

2.75

3.44

2.76

2.74

2.76

2.75

7.53

4.94

2.75

4.95

2.75

2.76

2.77

3.25

3.29

0.02

0

8

0.03

0

2.7

2.93

2.7

2.93

2.72

2.92

1.64

8.04

2.95

0.01

0

STOP PLAY

MODE

PIN NO.

2.79

0.46

2.77

2.94

0.46

0

0.46

0

0.46

0

2.7

0

0.02

3.2

0

2.4

2.72

2.7

0

1.04

0.12

7.8

1.59

0

1.58

0

3.12

4.03

2.5

2.45

0

2.4

2.94

2.121

3.18

1.58

5.54

5.5

0

5.5

5.54

12.1

2.79

0.46

2.77

2.94

0.46

0

0.46

0

0.46

0

2.7

0

0.02

3.2

0

4.8

4.84

0

0.03

1

0.4

8

1.6

0

3.17

4.9

2.5

0

2.47

0

3.2

3.21

1.58

5.52

0

5.3

5.52

12.1

STOP PLAY

MODE

PIN NO.

3.2

0

3.2

1.6

0

1.8

0

3.2

2.14

0.53

0

2.16

3.2

0

3.15

2.7

3

2.3

0.25

0.44

0

0.06

0.25

3.2

0

0.36

0.34

0

0.32

0

3.18

1.77

0.33

0

0.32

3.23

0.31

0.3

0

0.3

0

3.25

1

3.25

1

0

1

3.25

1

0

0.9

3.25

0.9

0.81

0.82

0.83

0.82

0.83

0.8

0.84

0.83

3.22

0

1

1.05

1.03

1

0

3.2

1.8

1.04

0

3.22

0

3.22

1

0

1

0

IC602

STOP PLAY

MODE

PIN NO.

3.2

0.01

3.2

3.18

0

3.18

3.17

3.2

0

3.2

4.08

3.2

0

3.2

0.01

0.03

3.18

0.01

3.2

3.18

3.2

0

0.8

0.54

0.53

0.54

0.56

0.6

0.77

0.8

3.16

0.82

0.77

0.76

0.7

0.77

0.74

0.73

0.75

0

3.16

3.2

0

1.68

0

1.7

4.28

3.22

3.2

0.01

3.22

0.01

3.22

0

3.22

4.1

3.22

0

3.22

0.01

3.22

0.01

3.22

0

3.2

0.93

0.95

0.8

0.78

0.74

0.76

0.8

0.9

3.2

0.8

0.76

0.8

0.83

0.82

0.83

0.8

0

3.2

0

0.95

0

1.26

3.44

IC603

IC609

NC(TEST PIN)

NC(TEST PIN) NC(TEST PIN)

NC(TEST PIN)

IC604

STOP PLAY

MODE

PIN NO.

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

1

2

3

4

5

6

7

8

9

10

1.7

5.2

0

2.3

0

0.09

3.2

0

2.6

0

1.31

0

5.23

4.97

2.31

0

1.32

0

1.08

0

2.4

0.05

2.31

4.2

2.3

4.97

2.34

0

2.38

0

2.34

0

1.56

0.03

2.38

0.03

4.96

1.4

0

2.45

3.1

0

3.15

0

3.15

1.35

5.2

3.2

0.1

0

5.23

3.2

0

2

0

1.11

0

5.23

4.95

2.26

4.95

1.43

0.01

1.45

0

2.3

0.05

2.25

4.2

2.265

4.9

2.26

0

2.3

0

2.3

0

2.3

1.8

0

1.66

0

0.03

2.31

0.03

4.94

0.06

1.6

2.52

3.21

0

3.2

STOP PLAY

MODE

PIN NO.

3.15

3.1

1.6

0

1.56

0

0.05

3.2

0.8

0.05

0.49

0.63

0

1

3.19

0

0.5

0.7

0.55

0

1.28

1.68

0.05

0.4

0.6

2.45

2.43

2.46

0.8

0

1.77

2.9

0

1.2

1.28

1.56

1

1.11

3.2

3.17

3.21

1.68

0

0.65

0

1.35

0

0.05

0.84

0.66

0.58

0

0.03

1.3

3.22

0

0.7

0.55

0.02

1.3

1.66

0

2.5

2.44

3.21

2.42

2.46

0.01

0

1.67

0

1.6

0

0.09

0

1.07

1

0

STOP PLAY

MODE

1.11

0.03

0

1

0.96

0.93

0.23

1

0

0.53

2.4

3.2

3.22

0

3.22

1.78

0

1.3

1.8

1.21

1.3

1.4

2.3

2

1.4

0.82

0.81

1.71

1.75

0

0.92

0.93

2.52

2.57

2.26

1.65

3.18

0

3.2

0.47

3.2

0.02

0.03

0

1.7

0

0.64

0.62

3.14

0.01

0.15

0.04

2.41

2.46

3.06

3.13

0.01

3.22

1.83

0

0.63

0.81

0.7

1.2

0.7

0.69

0.68

1.7

1.8

0

0.7

0.66

0.67

0.66

0.65

2.38

2.5

1.68

3.2

0.03

0

3.2

0.9

3.2

0.02

0.03

IC201

IC202

IC203

IC401

IC402

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

1

2

3

4

5

6

7

8

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

1

2

3

4

5

6

7

8

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

1

2

3

4

5

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

PIN NO.

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

STOP PLAY

MODE

0.02

3.19

1.79

1.69

1.56

0

1.79

0

4.1

3.08

2.27

2.26

3.18

3.19

3.18

0

3.18

3.16

3.19

0

3.2

0.45

0.43

0.47

0.42

0.48

1.03

1.76

0

1.03

1.04

1.05

1

0.94

0.92

1.04

1.05

3.24

0

3.19

0

3.2

3.19

0.77

0

3.19

0.77

0.02

3.21

1.93

1.66

0

1.79

0

4.1

3.24

3.23

3.22

3.21

3.2

3.22

0

3.22

0

3.22

0

3.22

3.21

0

3.23

0

0.98

0.99

0.98

1

3.22

0

0.81

0.01

3.2

0.01

PIN NO.

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

STOP PLAY

MODE

3.17

1.68

0

2.23

2.2

0

2.92

0

2.3

1.7

0

2.22

0

2.22

3.2

2.24

2.28

0.01

0

0.01

0.24

3.22

2.65

3.22

2.1

3.2

1.66

0

0.01

3.2

0.01

3.2

0

3.2

2.46

2.48

2.52

0

2.4

2.38

2.39

2.15

3.23

2.36

2.37

1.67

0

2.4

0

3.25

2.37

0.01

PIN NO.

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

IC503 (AT49BV8192A)

• CIRCUIT VOLTAGE CHART

IC601

3-79 3-80

+-

EE PLAY

-+

Tran-

sistor

C201

C202

C209

C217

C218

C220

C221

C233

C242

C251

C252

C255

C262

C263

C402

C403

C405

C406

C407

C408

C413

C414

C415

C617

C626

C632

C645

C646

C647

C648

C650

C651

C661

C663

C664

C665

C666

C667

C669

C673

0.1

8.1

4.93

5.1

2.1

1.76

3.23

3.25

1.8

5.1

3.26

1.8

5

3.16

2.5

5.55

12.17

5.55

3.2

1.8

3.2

1.8

1.7

2.3

1.6

2.3

5

0

1.3

0

2.5

0

2.44

0

0.7

0.6

0.66

0.794

0

2.39

0.81

0

2.5

0

2.46

0

0.06

0

0.7

0.5

0.8

0.6

0

2.3

0.68

2.45

0.1

8

8.04

4.94

5.03

2.11

1.75

3.22

3.24

1.77

5.02

3.24

1.8

4.95

3.14

2.47

5.51

12.07

5.5

3.21

3.23

3.2

1.77

3.22

1.7

2.33

1.65

2.33

2.34

2.33

4.94

0

1.4

BB

EE PLAY

EECC

Tran-

sistor

Q204

Q205

Q206

Q207

Q208

Q209

Q210

Q401

Q402

Q403

Q404

Q405

7.5

4.9

0

0.1

1.11

2.5

0

3.67

4.45

7.5

3.65

4.8

2.45

0.1

1.1

2.63

0

5.22

8

5.06

5.01

0

0.4

1.86

1.45

4.37

5.2

4.9

2.32

0.02

3.66

4.8

2.6

3.2

-0.37

-0.64

0

4.9

0

4.9

4.91

0

3.2

0.76

2.32

5.17

0

4.34

5

1.68

0

0.3

0

5.2

POSITION DRAWING OF DECK MECHANISM PARTS

• Top View......................................................4-1

• Bottom View ...............................................4-1

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

01.Assembly and disassembly of Drum.........4-2

02.Plate Top disassembly ..............................4-4

03.Holder Assembly CST...............................4-4

04.Disassembly of Gear Assembly

Rack F/L....................................................4-4

05.Opener Door .............................................4-4

06.Arm Assembly F/L.....................................4-4

07.Lever Assembly S/W.................................4-4

08.Motor Assembly L/D..................................4-5

09.Gear Wheel ...............................................4-5

10.Arm Assembly Cleaner..............................4-5

11. Head F/E ...................................................4-5

12.Base Assembly A/C Head.........................4-5

13.Brake Assembly T .....................................4-6

14.Arm Assembly Tension..............................4-6

15.Reel S / Reel T..........................................4-6

16.Base Assembly P4 ....................................4-7

17.Opener Lid ................................................4-7

18.Arm Assembly Pinch .................................4-7

19.Arm T/up ...................................................4-7

20.Supporter, Capstan ...................................4-8

21.Belt Capstan/Motor Capstan .....................4-8

22.Lever F/R ..................................................4-8

23.Clutch Assembly D37................................4-8

24.Gear Drive/Gear Cam ...............................4-9

25.Gear Sector...............................................4-9

26.Brake Assembly Capstan..........................4-9

27.Plate Slider................................................4-9

28.Lever Tension ............................................4-9

29.Lever Spring..............................................4-9

30. Lever Brake..............................................4-9

31.Gear Assembly P2/Gear Assembly P3 ...4-10

32.Base Assembly P2/Base Assembly P3 ...4-10

33.Base Loading ..........................................4-10

34.Base Tension ...........................................4-11

35.Arm Assembly Idler Jog ..........................4-11

DECK MECHANISM ADJUSTMENT

• Fixtures and tools for service ................4-12

1. Check of Mechanism Assembly Mode ....4-13

2. Previous Preparation for

Deck Adjustment .....................................4-14

3. Torque Measuring ...................................4-14

4. Adjustment of Guide Roller Height..........4-15

4-1. Prior Adjustment...............................4-15

4-2. Fine Adjustment...............................4-15

5. Adjustment of Audio/Control (A/C) Head..4-16

5-1. Prior Adjustment...............................4-16

5-2. Check of Tape Path between Pinch

Roller and Take-up Guide ................4-17

5-3. Fine Adjustment

(Azimuth Adjustment).......................4-17

6. X-distance Adjustment ............................4-17

7. Adjustment of Drum Assembly

(Video Heads) .........................................4-18

8. Tachometer Adjustment of

Deck Assembly........................................4-18

8-1. Check of Audio, RF Normalization

Time (Locking Time) in Play after

CUE or REV.....................................4-18

8-2. Check of Tape Curl and

Jam Status .......................................4-18

MAINTENANCE AND CHECK OF VIDEO FUNCTION

1. Checking Points before Repair ...............4-19

2. Essential Check and Maintenance..........4-20

3. Regular Check and Maintenance............4-20

4. Tools for Check and Maintenance...........4-20

5. Maintenance Course...............................4-20

5-1. Removal of Foreign Materials..........4-20

5-2. Grease Application...........................4-21

GUIDE FOR TROUBLESHOOTING

1. Deck Mechanism.....................................4-23

2. Front Loading Mechanism.......................4-26

EXPLODED VIEWS

1. Front Loading Mechanism Section...........4-28

2. Moving Mechanism Section(1) .................4-29

3. Moving Mechanism Section(2) .................4-30

SECTION 4 MECHANISM OF VCR PART(D-37)

CONTENTS

POSITION DRAWING OF DECK MECHANISM PARTS

4-1

5

4

3

2

6

9

• Top View

• Bottom View

21

24

23

22

31

32

31

32

25

34 28

27

29

20

26

30

24

1 Drum Assembly 3 screws A-1 T

2 Plate Top 2 hooks A-2 T

2 3 Holder Assembly CST 6 chasses A-2 T

2,3 4 Gear Assembly Rack F/L 1 hook A-2 T

2,3,4 5 Opener Door Chassis Hole A-2 T

2,3,4,5 6 Arm Assembly F/L Chassis Hole A-2 T

7 Lever Assembly S/W Chassis Hole, A-2 T

1 hook

8 Motor Assembly L/D 1 screw A-3 T

9 Gear Wheel 2 hooks A-3 T

10 Arm Assembly Cleaner Chassis Embossing A-3 T

11 Head F/E Chassis Embossing A-3 T

12 Base Assembly A/C Head 1 screw A-3 T

2,3 13 Brake Assembly T 1 hook A-4 T

2,3 14 Arm Assembly Tension 1 hook A-4 T

2,3,13,14 15 Reel S / Reel T Shaft A-4 T

16 Base Assembly P4 Chassis Embossing A-5 T

17 Opener Lid Chassis Embossing A-5 T

17 18 Arm Assembly Pinch Shaft A-5 T

17 19 Arm T/up 1 hook A-5 T

20 Supporter, capstan Chassis Hole A-6 B

17,18 21 Belt Capstan/Motor Capstan 3 screws A-6 B

22 Lever F/R Locking Tab A-6 B

21, 22 23 Clutch Assembly D37 Washer A-6 B

24 Gear Drive/Gear Cam Washer/Hook A-7 B

25 Gear Sector Hook A-7 B

21 26 Brake Assembly Capstan Chassis Hole A-7 B

21,22,23, 27 Plate Slider Chassis Guide A-7 B

24,2526

21,22,23, 28 Lever Tension 1 Hook A7 B

24,2526,27

21,22,23, 29 Lever Spring 1 Hook A-7 B

24,2526,27

21,22,23, 30 Lever Brake 1 Hook A-7 B

24,2526,27

25 31 Gear Assembly P2/ Bass A-8 B

Gear Assembly P3

2, 3, 14, 32 Base Assembly P2 6 Chasses A-8 B

25, 31 /Base Assembly P3

25, 31 33 Base Loading 3 Hooks A-8 B

2,3,14 34 Base Tension Chassis Embossing A-9 T

35 Arm Assembly Idler Jog Locking Tab A-9 T

Parts firstly Disassembled

Order Of Dis-

assembled

Part Fixing Type

Ref.

Draw-

ings

Posi

tion

NOTE : Assembly order is a reverse of

disassembly order.

(1) For assembly, check the assembly mode is accurate. (2) Parts firstly disassembled indicate parts firstly disassem-

bled in disassembly of related parts.

T:Top, B:Bottom

10

8

12

11

1

33

14

15

18

16

17 19

7

35

13

15

4-2

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

Cap, FPC

Drum Assembly

Cable Flat

(S1)

Holder FPC

H1

H2

1. Disassembly of Drum Assembly (Figure A-1)

1) Separate cable flat from the Drum FPC and the Capstan

Motor.

2) Release 3 screws (S1) on the bottom side of the chassis,

and separate the drum assembly.

3) Release the hooks (H1, H2) and separate both the holder

FPC and the Cap FPC (disassemble if necessary).

Fig. A-1

Cautions in assembly of FPC

Holder FPC

Drum FPC

Cap FPC

Assembly shape seen in the reverse direction

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

4-3

(B)

(E)

(C)

Plate Top

Arm Assembly F/L

Gear Assembly Rack F/L

Opener Door

Holder Assembly CST

(B')

(H3)

(A)

(B)

Lever Assembly S/W

(H4)

(E)

Fig. A-2

(Fig. A-2-1)

(Fig. A-2-2)

(Fig. A-2-5)

(Fig. A-2-6)

(Fig. A-2-3)

(Fig. A-2-4)

2. Disassembly of Plate Top (Fig. A-2-1)

1) Separate the right part while leaning back the (B) part of

the plate top toward the arrow direction.

2) Separate the left part while leaning back the (B’) part of

the plate top toward the arrow direction. (Tool used: Tool such as (-) driver, auger, etc with pointed or flat end)

CAUTIONS

Assemble while pressing the (C), (C’) part after corresponding them as in drawing.

3. Holder Assembly CST (Fig. A-2-2)

1) Firstly separate the left part from the groove on the (D)

part of chassis while moving the holder assembly CST toward the arrow direction.

2) Separate the right part from each groove of chassis

CAUTIONS

Assemble by inserting the left part after firstly inserting the (E) part of the holder assembly CST into the groove on the (E’) part of chassis.

4. Disassembly of Gear Assembly Rack F/L (Fig. A-2-3)

1) Separate the hook (H3) while leaning ahead the hook (3)

after moving the gear assembly rack F/L toward the arrow (A) direction.

2) Separate the gear assembly rack F/L toward the arrow (B)

direction.

CAUTIONS

For the assembly, correspond the gear part of gear assembly rack F/L to the gear drive.

5. Opener Door (Fig. A-2-4)

1) Separate the opener door ahead from the guide hole of

chassis while turning it clockwise.

6. Arm Assembly F/L (Fig. A-2-5)

1) Firstly separate the left part of the arm assembly F/L from

the groove of chassis while pushing the arm assembly F/L toward the arrow direction.

2) Separate the right part from the groove of chassis.).

7. Lever Assembly S/W (Fig. A-2-6)

1) Separate the lever assembly S/W while pushing it toward

the arrow direction after removing the hook (4) on the left side of chassis.

4-4

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

(C')

(C)

(B')

(B)

Holder Assembly CST

(D)

Chassis

Gear Rack F/L

Gear Drive

Chassis

(H4)

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

4-5

8. Motor Assembly L/D (Fig. A-3-1)

1) Take the connector (C1) connected to the Capstan motor PCB out.

2) Remove a screw (S4) of the chassis (S4) and step backward, and disassemble it while holding it up.

9. Gear Wheel (Fig. A-3-2)

1) Release the hook (H5) of the gear wheel and disassemble it upward.

10. Arm Assembly Cleaner (Fig. A-3-3)

1) Separate the (A) part of Fig. A-3-1 from the embossing of chassis, and hold it up while turning it anti-clockwise.

11. Head F/E (Fig. A-3-4)

1) Separate the (A) part of the head F/E from the embossing of chassis, and hold it up while turning it anti-clockwise.

12. Base Assembly A/C Head (Fig. A-3-5)

1) Release a screw (S5) and disassemble while holding it up.

Arm Assembly Cleaner

Motor Assembly L/D

Gear Wheel

Base Assembly A/C Head

(S4)

(S5)

Head F/E

(A)

(C1)

(H5)

(A)

Fig. A-3

(Fig. A-3-3)

(Fig. A-3-5)

(Fig. A-3-4)

(Fig. A-3-2)

(Fig. A-3-1)

4-6

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

Brake Assembly T

Reel T

Spring Tension

Arm Assembly Tension

Spring Tension

Reel S

(H7)

(H8)

(H6)

Fig. A-4

13. Brake Assembly T (Fig. A-4-1)

1) Release the spring tension from the lever spring hook (H6).

2) Disassemble the brake assembly T while holding it upward.

14. Arm Assembly Tension (Fig. A-4-2)

1) Release the spring tension the hook (H7) from the arm assembly tension.

2) After releasing the hook (H8) of the base tension, separate it while holding it up.

CAUTIONS

Spring used for both brake assembly T and arm assembly tension is used (2EA used).

15. Reel S/Reel T (Fig. A-4-3)

1) Disassemble the reel S/ reel T while holding it up (comparison between Reel S and Reel T)

Reel S Reel T

(Fig. A-4-3)

(Fig. A-4-2)

(Fig. A-4-1)

(Fig. A-4-3)

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

4-7

Opener Lid

Arm Assembly Pinch

Base Assembly P4

Arm T/up

(A)

(B)

(C)

Chassis

(C)

(H9)

Fig. A-5

16. Base Assembly P4 (Fig. A-5-1)

1) Release the (A) part of the base assembly P4 from the embossing of chassis.

2) Hold the base assembly P4 up while turning it anti-clockwise.

17. Opener Lid (Fig. A-5-2)

1) Release the (B) part of the opener lid from the embossing of chassis.

2) Disassemble the opener lid upward while turning it anticlockwise.

18. Arm Assembly Pinch (Fig. A-5-3)

1) Hold the arm assembly pinch up.

19. Arm T/up (Fig. A-5-4)

1) Turn the arm T/up to release the anchor jaw (H9) part of chassis and then hold it upward.

CAUTIONS

For the assembly, check the (C) part of the arm assembly pinch is assembled as in drawing.

- REVERSE THE MECHANISM.

(Fig. A-5-2)

(Fig. A-5-1)

(Fig. A-5-3)

(Fig. A-5-4)

4-8

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

Chassis

(S6)

Belt Capstan

Motor Capstan

Washer(W1)

Lever F/R

Clutch Assembly D37

(L1)

Suppoter Capstan

Fig. A-6

20. Supporter, Capstan (Fig. A-6-1)

1) Turn the supporter and Capstan by 90 deg. clockwise with a driver for disassembly.

21. Belt Capstan (Fig. A-6-2) /

Motor Capstan (Fig. A-6-3)

1) Separate the belt Capstan.

2) Undo 3 screws (S6) on the bottom side of chassis and disassemble it upward.

22. Lever F/R (Fig. A-6-4)

1) Release the locking tab (L1) and then disassemble it upward.

23. Clutch Assembly D37 (Fig. A-6-5)

1) Remove the washer (W1) and then disassemble it upward.

(Fig. A-6-1)

(Fig. A-6-2)

(Fig. A-6-3)

(Fig. A-6-4)

(Fig. A-6-5)

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

4-9

Gear Drive

Washer (W2)

Gear Cam

Plate Slider

Lever Tension

Lever spring

Base Loading

Gear Sector

(B)

(A)

(H10)

(W2)

(L2)

(H11)

Chassis

Gear Cam Hole(C)

Gear Cam Hole(B)

Gear Drive Hole(A)

Brake Assembly Capstan

Lever Brack

Fig. A-7

24. Gear Drive (Fig. A-7-1)/ Gear Cam (Fig. A-7-2)

1) Remove the washer (W2) and then disassemble the

gear drive.

2) Release the hook (H10) of the gear cam and then disas-

semble it upward.

CAUTIONS

For the assembly, adjust both the gear driver hole (A) and the gear cam hole (B) straightly and then correspond the gear cam hole (C) to the chassis hole.

25. Gear Sector (Fig. A-7-3)

1) Release the hook (H11) of the gear sector and then hold

the gear sector upward.

26. Brake Assembly Capstan (Fig. A-7-4)

1) Release the locking tab (L2) on the bottom side of the plate slider and then disassemble it upward.

27. Plate Slider (Fig. A-7-5)

1) Disassemble the plate slider while holding it up.

28. Lever Tension (Fig. A-7-6)

1) Release the lever tension from the guide (A) of chassis while turning it anti-clockwise.

2) Disassemble the lever tension while holding it up.

29. Lever Spring (Fig. A-7-7)

1) Release the (B) part of the lever spring from the guide (A) of chassis while turning it anti-clockwise.

2) Disassemble the lever tension while holding it up.

30. Lever Brake (Fig. A-7-8)

1) Disassemble the lever brake while holding it up.

(Fig. A-7-4)

(Fig. A-7-5)

(Fig. A-7-8)

(Fig. A-7-7)

(Fig. A-7-6)

(Fig. A-7-1)

(Fig. A-7-2)

(Fig. A-7-3)

4-10

DECK MECHANISM DISASSEMBLY

Gear Assembly P3

Gear Assembly P2

Base Assembly P2

Base Assembly P3

(A)

(B)

(H14)

(H12)

(H13)

Chassis

Gear assembly P2 Hole

Gear assembly P3 Hole

Lever Tension Boss

Plate slider Hole(B)

Base Loading

Fig. A-8

31. Gear Assembly P2 (Fig. A-8-1)/ Gear Assembly P3 (Fig. A-8-2)

1) Hold the gear assembly P2 upward.

2) Hold the gear assembly P3 upward.

CAUTIONS

For the assembly, check the holes of both the gear assembly P2 and the P3 are adjusted straightly, and then correspond the gear section groove (A) to the plate slider hole (B).

32. Base Assembly P2 (Fig. A-8-3)/ Base Assembly P3 (Fig. A-8-4)

1) Disassemble the base assembly P2 downward while mov-

ing it toward the arrow (A) direction along with the guide hole of chassis.

2) Disassemble the base assembly P2 downward while mov-

ing it toward the arrow (B) direction along with the guide hole of chassis.

33. Base Loading (Fig. A-8-5)

1) Release 3 hooks (H12, 13, 14) of the base loading, and

then disassemble them upward.

- Reverse the mechanism.

(Fig. A-8-1)

(Fig. A-8-2)

(Fig. A-8-5)

(Fig. A-8-4)

(Fig. A-8-3)

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

4-11

(A)

(B) (C)

Arm Assembly Idler Jog

Base Tension

Chassis

(D)

Fig. A-9

34. Base Tension (Fig. A-9-1)

1) Release the (A) part of the base tension from the embossing of chassis.

2) Hold the base tension upward while turning it anti-clockwise.

35. Arm assembly Idler Jog (Fig. A-9-2)

1) Push both (B), (C) parts in Fig. A-9-2 toward the arrow direction.

2) Disassemble the arm assembly idler upward.

CAUTIONS

Take care to ensure that the (D) part in the drawing is not hung to chassis in disassembly.

(Fig. A-9-1)

(Fig. A-9-2)

DECK MECHANISM ADJUSTMENT

4-12

• Fixtures and Tools for Service

1. Cassette Torque Meter SRK-VHT-303(Not SVC part) Part No:D00-D006

4. Torque gauge adaptor Part No:D09-R001

5. Post height adjusting driver Part No:DTL-0005

6. + Type driver (ø5)

2. Alignment tape Part No NTSC:DTN-0001 PAL:DTN-0002

3. Torque gauge 600g.Cm ATG Part No:D00-D002

SRK

VIDEO

CASSETTE

TORQUE

METER

VHT-303

S

R

K

-

V

H

T

-

S

R

K

-

V

H

T

300

250

200

150

50

0

300

250

200

150

50

0

100

Purpose of adjustment : To make tools normally operate by positioning tools accurately.

DECK MECHANISM ADJUSTMENT

4-13

1) Turn the VCR on and take the tape out by pressing the eject button.

2) Separate both top cover and plate top, and check both the hole (A) of gear cam and the hole (A’) of chassis correspond (Fig. C-2).

3) If it is done as in the paragraph 2): Turn the gear cam as in No.2) after mantling the motor assembly L/D.

4) Undo the screw fixing the deck and the main frame, and separate the deck assembly. Check both the hole (A) of gear cam and the hole (A’) of chassis correspond (Fig. C-1).

5) Check the mode S/W on the main P.C. board locates at a proper position as in (B) of the Fig. (C-1).

6) Connect the deck to the main P.C. board and perform all types of test.

Gear Cam

Gear Drive

(C)

Mode S/W

(B)

Fixtures and tools used VCR (VCP) status Checking Position

• Blank Tape (empty tape)

• Eject Mode (with cassette withdrawn)

• Mechanism and Mode Switch

Fig. C-1

Fig. C-2

CHECK DIAGRAM

BOTTOM VIEW

TOP VIEW

Correspondence of the gear cam hole (O)

and the gear drive hole (O)

1. Mechanism Assembly Mode Check

Motor Assembly L/D

Gear Cam

(A')

Chassis Hole

(A)

Gear Cam Hole

Purpose of Measuring : To measure and check the reel torque on the take-up part and the

supply part that performs basic operation of the VCR (VCP) for smoothly forwarding the tape. Measure and check followings when the tape is not smoothly wound or the tape velocity is abnormally proceeded:

4-14

• Torque Gauge (600 g.cm ATG)

• Torque Gauge Adaptor

• Cassette Torque Meter SRK-VHT-303

• Play (FF) or Review (REW) Mode

• Try to operate the VCR (VCP) per mode with the tape not inserted (See ‘2. Prior Preparation for Deck Adjustment).

• Measure after adhering and fixing the torque gauge adaptor to the torque gauge (Fig. C-3-1)

• Read scale of the supply or take-up part of the cassette torque meter (Fig. C-3-2).

DECK MECHANISM ADJUSTMENT

1) Take the power cord from the consent.

2) Separate the top cover and the plate assembly top.

3) Insert the power cord into again.

4) Turn the VCR (VCP) on and load the cassette while pushing the lever stopper of the holder assembly CST backward. In this case, clog both holes on the housing rail part of chassis to prevent detection of the end sensor.

If doing so, proceeding to the stop mode is done. In this status, input signals of all modes can be received. However, operation of the Rewind and the Review is impossible since the take-up reel remains at stop status and so cannot detect the reel pulse (however, possible for several seconds).

2. Previous Preparation for Deck Adjustment

(Preparation to load the VCR (VCP) with cassette tape not inserted)

3. Torque Measuring

NOTE

Adhere the torque gauge adaptor to the torque gauge for measuring the value.

SRK

VIDEO

CASSETTE TORQUE

METER

VHT-303

S

R

K

-

V

H

T

-

S

R

K

-

V

H

T

300

250

200 150

50

0

300

250

200

150

50

0

100

Fig. C-3-2Fig. C-3-1

Torque Gauge

Torque Gauge Adaptor

Reel Table

Item

Fast forward Torque

Rewind Torque

Play Take-Up Torque

Review Torque

Fast Forward

Rewind

Play

Review

Torque Gauge

VHT-303

Take-Up Reel

Supply Reel

Take-Up Reel

Supply Reel

More than 400g°cm

40~100g°cm

120~210g°cm

Mode Instruments Reel Measured Measuring Value

• Cassette Torque Meter (SRK-VHT-303)• Torque Gauge (600g.cm ATG)

VCR (VCP) status Measuring methodFixtures and tools used

Adjustment Procedure

1) Travel the tape and check the bottom surface of the tape travels along with the guide line of the lower drum.

2) If the tape travels toward the lower part of guide line on the lower drum, turn the guide roller height adjusting screw to the left

3) If it travels to the upper part, turn it to the right.

4) Adjust the height of the guide roller to ensure that the tape is guided on the guide line of the lower drum at the inlet/outlet of the drum. (Fig. C-4-1)

DECK MECHANISM ADJUSTMENT

4-15

Fig. C-4-1

GUIDE ROLLER HEIGHT ADJUSTMENT SCREW

ADJUSTMENT DIAGRAM

Purpose of adjustment : To ensure that the bottom surface of the tape can travel along with

the tape lead line of the lower drum by constantly and adjusting and maintaining the height of the tape.

4. Guide Roller Height Adjustment

Fixtures and tools used VCR (VCP) status Adjustment position

• Post Height Adjusting Driver

• Play or Review Mode

• The guide roller height adjusting screw on the supply guide roller and the take-up guide roller

4-1. Prior Adjustment

1) Play the standard test tape after connecting the probe of oscilloscope to the RF envelope output point and the head switching output point.

2) Tracking control (playback) : Locate it at the center (Set the RF output to the maximum value via the tracking control when such adjustment is completed after the drum assembly is replaced.)

3) Height adjusting screw: Flatten the RF waveform. (Fig. C-4-2)

4) Move the tracking control (playback) to the right/left. (Fig. C-4-3)

5) Check the start and the end of the RF output reduction width are constant.

CAUTIONS

There must exist no crumpling and folding of the tape due to excess adjustment or insufficient adjustment.

Fig. C-4-2

P2 POST ADJUSTMENT

P3 POST ADJUSTMENT

CH-1 CH-2

RF ENVELOPE OUTPUT POINT

HEAD RF SWITCHING OUTPUT POINT

Flatten the waveform by lightly turning the guide roller height adjustment screw.

When turning the tracking control to both sides.

OSCILLOSCOPE

When the tracking control locates at the center.

Waveform

Connection Diagram

Fixtures and tools used

Measuring tools and

connection position

VCR (VCP) status Adjustment position

• Oscilloscope

• Standard test tape

• Post height adjusting

driver

• CH-1: PB RF Envelope

• CH-2: NTSC : SW 30Hz PAL : SW 25Hz

• Head switching output

point

• RF Envelope output

point

• Play the standard test tape.

• Guide roller height adjusting screw

4-2. Fine Adjustment

4-16

DECK MECHANISM ADJUSTMENT

8.3

Fig. C-5-1

A/C Head Base

Fig. C-5-2

Height Adjustment

Screw(B)

Tilt Adjustment

Screw(C)

Azimuth Adjustment Screw(A)

X-Value Adjustment Hole

Fig. C-5-3

A/C Head

Tape

0.2~0.25mm

P4

A/C Head Assembly

Purpose of adjustment : To ensure that audio and control signals can be recorded and

played according to the contract tract by constantly maintaining distance between tape and head, and tape tension between the P3 post and the P4 post.

5. Audio/Control (A/C) Head Adjustment

Adjustment Procedure/Adjustment Diagrams

1) Basically use the A/C head assembly adjusted as in SPEC.

2) Check there is crumpling and folding of the tape around the A/C head. If it is, Turn and adjust the tilt adjusting screw to ensure that the tape corresponds to the bottom guide of the P4, and recheck the tape path after proceeding play for 4-5 seconds.

3) Where the tape bottom is not equal to Fig. C-5-3, Adjust the height by using the height adjusting screw (B) and then readjust it by using the tilt adjusting screw (C).

CAUTIONS

Always check the height of the A/C head since most ideal height of A/C head can be obtained when the bottom part of the tape is away 0.2 ~ 0.25mm from the bottom part of the A/C head.

Fixtures and tools used VCR (VCP) status Adjustment position

• Blank Tape (Empty Tape)

• Driver (+) Type ø 5

• Play the blank tape (empty tape).

• Tilt adjusting screw (C)

• Height adjusting screw (B)

• Azimuth adjusting screw (A)

5-1. Prior Adjustment (performed only when no audio output appears in play of the standard test tape)

Fixed Screw

Adjustment Procedure

1) After releasing the auto tracking, lightly turn the fixing screw. Turn the (+) type driver (Ø 3 ~ Ø 4) on the X-distance adjusting hole to the right or left. Adjust the RF envelope level to the maximum point and then fix the fixing screws.

2) For the 31mm head, adjust it with the SP tape recorded in the width of 31mm since the head travels on the tape track only for SP with the width of 58mm.

DECK MECHANISM ADJUSTMENT

4-17

5-2. Tape Path Check between Pinch Roller and

Take up Guide (Check in the Rev Mode)

1) Check the tape pass status between the pinch roller and the take-up guide.(Check there is crumpling of the tape pass and folding of the take-up guide.)

1) (1) When holding of the take-up guide bottom occurs

Turn the tilt adjusting screw (C) clockwise and travel it stably to ensure there is no crumbling or folding of the tape.

1) (2) When holding of the take-up guide top occurs

Turn the tilt adjusting screw (C) anti-clockwise and

travel it stably to ensure there is no crumbling or folding of the tape.

1) 2) Check there is folding of the tape at the bottom or top

of the take-up guide in cutting-off the REV mode

CAUTIONS

If the RF waveform is changed after adjusting the A/C head, perform fine adjustment to ensure the RF waveform is flattened.

Adjustment Procedure

1) Connect the probe of Oscilloscope to the audio output jack.

2) Ensure that Audio 1KHz, 7KHz output is flattened at the maximization point by adjusting the Azimuth adjusting screw (A).

Fig. C-5-4

Fixtures and tools used Connection position VCR (VCP) status Adjustment position

• Oscilloscope

• Standard test tape

(only for SP)

• Driver (+) Type Ø 4

• Audio Output Jack • Play the standard test

• Tape, 1KHz, 7KHz.

• Azimuth Adjusting Screw (A)

• Height Adjusting Screw (B)

5-3. Fine Adjustment (Azimuth Adjustment)

1KHz

A: Maximum

7KHz

B: Minimum

Fig. C-6

Fixtures and tools used Connection position VCR (VCP) status Adjustment position

• Oscilloscope

• Standard test tape (only for SP)

• Driver (+) Type Ø 4

• CH-1: PB RF Envelope

• CH-2: NTSC ; SW 30Hz PAL:SW 25Hz

• Head switching output

point

• RF Envelope output

point

• Play the standard test tape.

6. X-distance Adjustment

Left

X-distance Adjusting Hole

Tilt Adjusting Screw (C)

Fixing Screw

Height Adjusting Screw (B)

Right

Grove of Base A/C

Purpose of adjustment : To maintain compatibility with other VCR (VCP).

RF ENVELOPE OUTPUT POINT

HEAD RF SWITCHING OUTPUT POINT

OSCILLOSCOPE

Connection Diagram

CH-2CH-1

Azimuth

Adjustment

Screw(A)

Checking/Adjustment Procedure

1) Play the blank tape (empty tape) and check whether the guide roller crumbles or wrinkles the tape and adjust it if necessary.

2) Check that the RF envelope output waveform is flat, and adjust the height of the guide roller while playing the standard test tape.

3) Adjust the switching point.

4) Check the RF envelope output is the maximum when the tracking control locates at the center. If not maximum, set up to ensure that RF envelope output becomes the maximum by turning the (+) type driver (Ø 3 ~ Ø 4) on the base A/C groove.

4-18

DECK MECHANISM ADJUSTMENT

8-2. Check of Tape Curl and Jam Status

Fixtures and tools used Connection position VCR (VCP) status Adjustment position

• Oscilloscope

• Standard test tape (only for SP)

• Post Height Adjusting Driver

• Driver (+) Type Ø 5

• CH-1: PB RF Envelope

• CH-2: NTSC : SW 30Hz PAL:SW 25Hz

• Head switching output

point

• RF Envelope output

point

• Play the blank tape.

• Play the standard test tape.

• Fine adjustment of guide roller

• Switching Point

• Tracking Preset

• X-distance

7. Adjustment after Drum Assembly (Video Heads)

Purpose of adjustment : To adjust and stabilize the height change, X-distance change, etc

depending on the guide roller after assembling the drum.

RF ENVELOPE OUTPUT POINT

V2V1V1

V1/V MAX = 0.7 V1/V MAX = 0.8 RF ENVELOPE OUTPUT

HEAD RF SWITCHING OUTPUT POINT

OSCILLOSCOPE

Connection Diagram

Waveform

CH-2CH-1

Checking Procedure

1) Check that locking time of the RF and Audio waveform is fallen within the measuring standard in conversion of the play mode from the CUE or the REV mode.

2) Readjust the paragraph 5 and 6 if it deviates from the standard.

Fixtures and tools used Measuring standard Connection position VCR (VCP) status

• Oscilloscope

• 6H 3KHz Color Bar Standard Test tape

• Stop Watch

• RF Locking Time: Within 5 seconds

• Audio Locking Time : Within 10 seconds

• CH-1: PB RF Envelope

• CH-2: Audio output

• RF Envelope output point

• Audio output jack

• Play the 6H 3KHz Color Bar Standard Test tape.

8. Check of Traveling Device after Deck Assembly

8-1. Audio, RF Normalization Time (Locking Time) Check in Play after CUE or REV

Checking Procedure

1) Check there is no abnormality of every traveling post status.

2) There must be no abnormal operation of the counter in

occurrence of folding of the bottom tape. There must be not abnormality of audio signal in damage of the top tape.

3) If there is abnormality, readjust the adjustment paragraph 4 and 5.

Fixtures and tools used Fixtures and tools used Fixtures and tools used

• T-160 Tape

• T-120 Tape

• There must be no jam or curl at the first, middle and end position of tape.

• Travel the tape at the position of its first and end.

PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION

4-19

(3) F/E Head

(5) Drum Assembly

(Video Head)

(4) Base Assembly P2

(2) Tension Post

(1) Supply Reel

(6) Base Assembly

P3

Phenomena

Replace-

ment

Checking Points and Cause

Color beat Pollution of Full-Erase Head o

S/N, Color Faded Pollution of Video Head o

Horizontal, Vertical Jitte o

CAUTIONS

If operation of the position with (O) mark is abnormal even after removing cause, replace it with substitute product since it shows damage or wearing.

(7) A/C Head

(8) P4 Post

(10) Pinch Roller

(11) Take-up Guide

Post

(9) Capstan Shaft

(12) Take-up Reel

* No. (1) ~ (12) shows sequence that the tape moves from the supply reel to the take-up reel.)

Fig. C-9-1 TOP VIEW

Fig. C-9-2 BOTTOM VIEW

F/E Head

Video Head

A/C Head

Pinch Roller

Belt Capston

Clutch

Assembly A37

Fig. C-9-3 Tape Transport System

Pollution of Video Head or Tape Transport System

Poor Sound, Low Sound o

Pollution of Audio/Control Head

o

Pollution of Pinch Roller or Belt Capstan Belt

No tape wound or tape wound loosely. FF or REW impossible, or slow turning

Deterioration of Clutch Assembly D37 Torque

Pollution of Drum and Traveling Device

Tape loosely wound in REV or Unloading

o

Fig. C-9-3

1. Checking Points prior to Repair

Following abnormal phenomena may be repaired by removal of foreign materials and oil supply. Check oiling is required at the checking set or cleaning status is complete. Determine that necessity of checking and repair the set exists after checking the using period of the set together with the user. In this case, followings must be checked:

PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION

4-20

2. Essential Check and Repair

Recording density of the video is far higher than the audio. Therefore video parts are very precise so as to allow only error of 1/1000mm or so in order to maintain compatibility with other videos. If one of these parts is polluted or old, same phenomena will appear as they are damaged. To maintain clear screen, regular check, replacement of old and damaged parts and oil supply, etc are essential.

3. Regular Check and Repair

Check and repair schedule is not constant since they vary depending on method that the consumer uses video and environment where the video is installed at. However, for the video used by common household, good screen will be maintained if regular check and repair per 1,000 hour is performed. The following chart shows relationship between using time and checking time:

4. Tools for Check and Repair

(1) Grease: Floil G-3114 (KANTO) or equivalent grease

(Green) (2) Grease: Kanto G-754, PL-433 (Yellow) (3) Alcohol (Isopropyl Alcohol) (4) Cleaning Patch (cloth)

5. Maintenance Process

5-1) Removal of Foreign Material

(1) Removal of foreign material from video head (Fig. C-9-4)

Firstly try to use a cleaning tape.

(1) Use a cleaning patch if foreign materials are not removed

with the cleaning tape due to severe dirty of the head.

Soak the cleaning patch in alcohol and put it to the head

tip. Smoothly turn the drum (turning cylinder) to the right

or left (In this case, the cleaning patch must not be

moved vertically).

(1) After completely drying the head, test the traveling status

of the tape.

(1) If alcohol (Isopropyl Alcohol) remains at the video head,

the tape may be damaged when this solution touches

with the head surface.

Never use a cloth bar (commercial sale)

(2) Wipe the tape transport system and the drive system

with the cleaning patch soaked in alcohol (Isopropyl

Alcohol) when removing foreign materials from them.

1) The part touched with the traveling tape is called as tape transport system. The drive system consists of parts to travel the tape.

(2) 2) Care must be exercised so that unreasonable force

to change the pattern will be applied to the tape transport system during removal of foreign materials.

About 1 year

One hour

Table 1

Two hours

Three hours

Time

Requiring

Checking

Average hours used per day

About

18 months

About

3 years

Fig. C-9-4

Drum (Turning Cylinder)

Head Tip

Soak alcohol (Isopropyl Alcohol).

Cleaning Patch

(Cloth)

Smoothly turn the drum (turning cylinder) touching the soft surface to the head tip surface.

PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION

4-21

5-2) Grease Applications

(1) Grease Application Method

Apply grease by using a cloth swab or brush. Care must be exercised so that excess quantity should not be used. If the excessive quantity is applied, wipe it with the gauze soaked in alcohol (Isopropyl Alcohol).

NOTE: POSITION OF GREASE APPLICATION

(2) Regular Grease Application

Apply grease to the designated application position every 500 hour.

5

4

2

1

3

(1) Inner Side Surface and Top

Surface of Loading Path

(2) Stable Adhesion Part of Base

P2, P3

(3) Arm Pinch Shaft

(4) Gear Wheel Shaft (5) Reel S. T. Shaft

(1) (2) (3) (4): KG-684G (Green) (5): PL-433 (Yellow)

Cam Part (PL-433.Yellow)

Gear Part (PL-433.Yellow)

Boss Part Side Wall (PL-433.Yellow)

Gear Part Side Application (PL-433.Yellow)

Cam Part Side Application (KG-684G.Green)

Gear Sector Gear Cam

Base Loading Gear Drive

Gear Part

1

2

3

4

6

5

7

(1) Inner Side Surface and Top

Surface of Loading Path

(2) Stable Adhesion Part of Base

P2, P3 Coil (3) Gear Cam Shaft (4) Gear Drive Shaft (5) Clutch Shaft Groove

(6) Guide Part on the Plate Slider

Side Wall (Left)

(7) Guide Part on the Plate Slider

Side Wall (Right) (1) (2) (3) (4) (5) (6) (7): KG684G (Green)

Chassis (TOP)

Chassis (Bottom)

Cam Part (KG-684G , GREEN)

Cam Part

(KG-684G , GREEN)

Gear Rack F/L

Lever, Brake Driving Cam Part

Side Wall Guide Part

Lever F/R Driving Part

Side Wall Guide Part

Lever, Spring Driving Part

Lever Tension Driving Cam Part

Gear Sector Driving Part

Plate Slider

Chassis (L) Chassis (R)

Inner Surface of

Guide Rail

(KG-684G.Green)

PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION

4-22

Lever, F/R, Base, Tension GEAR AY, P2 & P3

LEVER, F/R

Clutch Contact Part (PL-433, Yellow)

Tension Arm Party Hinge Part (PL-433, Yellow)

BASE, TENSION

PL-433

MECHANISM TROUBLESHOOTING GUIDE

4-23

No Auto Rewind operates.

Is output of the end sensor “H”? “H”: 3.5V or less “L”: 0.7V –1V or less

Is voltage at both ends of the IR LED 0.8V-1.5?

Replace the LED.

Is the end sensor Vcc applied at 5V?

Check the Syscon power supply.

Replace the end sensor.

Is the Syscon checked?

NO

YES

NO

1.Deck Mechanism

A.

NO

No F/R operates.

Is the current mode an F/R mode?

Check the assembly position of the Mode S/W.

Is normal voltage applied at the Vcc1 and the Vcc2 of the Capstan motor?

Is the Vctl terminal voltage of the Capstan Motor applied at more than 4V?

Check the Servo, Power circuit.

Replace the Capstan motor.

Does the Capstan motor rotate?

Does the T/up and the supply reel Operate?

Check the Syscon circuit.

YES

B.

4-24

MECHANISM TROUBLESHOOTING GUIDE

Auto Stop operates.

(PLAY/CUE/REV)

Does the T/UP or the supply reel pulse occur?

Does the pinch roller attached to the Capstan shaft turn in operation of the Play/Cue/Rev.

Replace the reel sensor.

Is output of the DFG, DPG normal?

Check the assembly mode. Check the spring pinch.

Replace the drum motor.

Check the Servo, Syscon.

Check the Syscon, µ-com.

No cassette loading is done.

Insert the cassette.

Check the holder assembly CST.

Does output of the CST IN S/W change? (In insertion of the REC tape: “L”_“H”_ “L”) (In insertion of the REC prevention tape: “L”_ “H”_ “L”_ “H”)

Is the CST IN S/W normal?

Is operation of the lever assembly S/W normal?

Check the Syscon circuit.

Replace the CST IN S/W.

YES

NO

YES

C.

D.

4-25

MECHANISM TROUBLESHOOTING GUIDE

No tape winding is done in play.

Is the pinch roller attached to the Capstan shaft in operation of play?

Check the assembly mode?

Does the T/up reel operate?

Hang the Capstan belt.

Is the Capstan belt hung?

Does the drum motor turn?

Is the DPG, DFG normal?

Are the T/up and the reel sensor

normal?

Check the Syscon circuit.

Does the Capstan motor turn?

Is the Vctl terminal voltage of the drum motor at more than 2.3V?

Replace the drum motor.

Is the Vcc voltage of the drum motor normal?

Check the clutch and the idler assembly.

YES

NO

Is the Vctl terminal voltage of the Capstan motor applied at more than 4V?

Replace the Capstan motor.

Is normal voltage applied to the capstan motor Vcc1, Vcc2?

YES

Check the Servo, power circuit.

NO

E.

MECHANISM TROUBLESHOOTING GUIDE

4-26

No cassette insert is done.

Does the lever assembly switch operate?

Is the lever assembly switch spring normal?

Does the CST IN switch operate normally?

Add or replace the lever

assembly switches spring.

Is the Vcc of the main P.C.B assembly?

YES

Check the Syscon circuit.

YES

Check the power circuit.

NO

Is voltage between the cassette switch terminal and the GND on the main P.C.B assembly?

YES

Is there short between the cassette switch terminal and the GND on the main P.C.B assembly?

Replace the main P.C.B assembly or remove the short part.

NO

Check the mode switch position and the Syscon circuit.

Replace the CST IN switch.

YES

NO

YES

NO

Replace the F/L switch.

NO

No cassette eject is done.

Does the L/D motor turn in reverse?

Check the L/D motor and the drive IC.

Replace the lever assembly switch.

Does the lever assembly switch operate?

YES

NO

Does the arm assembly F/G operate?

YES

NO

Does the opener door operate?

YES

Replace the arm assembly F/L

Replace the opener door.

2. Front Loading Mechanism

A.

B.

MECHANISM TROUBLESHOOTING GUIDE

4-27

No safe adherence of tape is done.

Is cassette insert done?

Does the opener lid operate?

Check the assembly status of the opener door.

Replace the opener lid.

Replace the arm assembly F/L.

Check power supply of the L/D motor.

Check the assembly status of the holder assembly cassette.

Replace the gear rack F/L.

Does the gear rack F/L operate?

Does the opener door operate?

Does the arm assembly F/L operate?

Does the L/D motor operate?

Does the holder assembly cassette move same as the arm assembly F/L?

Replace the front loading mechanism assembly.

YES

NO

YES

NO

YES

NO

YES

NO

C.

4-28

EXPLODED VIEWS

100

A21

A23

A24

032

109

A22

054A

054

115

116

110

112

113

114

103

105

102

106

107

1. Front Loading Mechanism Section

EXPLODED VIEWS

4-29

008

011

031

079

017

032

024

406

031

021

028

029

026

A03

027

022

003

004

006

007

014

015

009

409

013

016

012

OPTIONAL PART

A01

405

2. Moving Mechanism Section (1)

EXPLODED VIEWS

4-30

052

517

061

056

518

052A

055

410

032

077

076

078

060

051

064

A11

A12

067

066

065

068

069

070

023

080

058

3. Moving Mechanism Section (2)

Zenith XBV-442, XBV-443 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual