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Zenith DVB312 Manual

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PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS
SERVICING PRECAUTIONS
• General Servicing Precautions
• Insulation Checking Prodedure
• Electrostatically Sensitive Devices
SPECIFICATIONS
SECTION 1
SUMMARY
CONTENTS
.................................................................................................. 1-4
...................................................................................................................... 1-5
........................... 1-3

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Summary of Contents for Zenith DVB312

  • Page 1 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...
  • Page 2 PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY, SUBJECT : X-RADIATION NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFAC- 1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PER- TURER’S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY SONNEL COVER THE SUBJECT OF X-RADIATION.
  • Page 3 SERVICING PRECAUTIONS CAUTION : Before servicing the DVD covered by this service Electrostatically Sensitive (ES) Devices data and its supplements and addends, read and follow the Some semiconductor (solid state) devices can be damaged SAFETY PRECAUTIONS. NOTE : if unforeseen circum- easily by static electricity.
  • Page 4 SECTION 2 CABINET & MAIN CHASSIS CONTENTS 1. EXPLODED VIEWS ........................2-2 1. Cabinet and Main Frame Section ...................2-2 2. Deck Mechanism Section......................2-4 3. Packing Accessory Section ....................2-5...

  • Page 5: Exploded Views

    EXPLODED VIEWS 1. Cabinet and Main Frame Section OPTIONAL PART SCART&5.1CH MODEL ONLY KARAOKE MODEL ONLY KARAOKE MODEL ONLY...

  • Page 6: Deck Mechanism Section

    2. Deck Mechanism Section 022A 024A 024A 024B 015B 011A 015A 015C...

  • Page 7: Packing Accessory Section

    3. Packing Accessory Section RF CABLE 810 CABLE SET ASS'Y PLUG ASS'Y 1WAY(YELLOW) PLUG ASS'Y 2WAY BATTERY PLUG ASS'Y 1WAY(BLACK) REMOCON OWNER'S MANUAL PACKING SHEET PACKING PACKING BOX CARTON OPTIONAL PARTS...

  • Page 8: Table Of Contents

    SECTION 3 ELECTRICAL CONTENTS ELECTRICAL TROUBLESHOOTING GUIDE ..............3-2 1. Power check flow........................3-2 2. System operation flow ......................3-3 3. Test & debug flow ........................3-4 4. Karaoke flow ..........................3-10 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING ....3-11 1. SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL............3-11 2.

  • Page 9: Electrical Troubleshooting Guide

    ELECTRICAL TROUBLESHOOTING GUIDE 1. Power check flow No VF+ No 5V_A . Is 5.2VA section working? Is 5.2VA section working? Is 5.2V present at emitter Check F102 No 5.2VA. of Q107? Replace D109. Check F101 Replace Q107. Is there a DC voltage at Replace R101.

  • Page 10: System Operation Flow

    2. System operation flow Power On 1. 8032 initializes SERVO, DSP & RISC registers 2. Write RISC code to SDRAM 3. Reset RISC Show LOGO Tray Closed? Tray Close to Closed position SLED at Inner Side? SLED Moves to Inner Position 1.

  • Page 11: Test & Debug Flow

    3. Test & debug flow TEST Check the AC Vol tage Check the POWER PART Power PCBA (110V or 220V) Switch on the Power PCBA the DC Vol tage outputs OK? Check the POWER PART (5V, 3.3V, 8V, 12V) Make sure the main PCBA don’t Is 3.3V and 2.5V DC Check the regulators or diode( D670).
  • Page 12 RESET or Power On. Flash Check connecti on lines between FLASH Memory operates Show LOGO? & MT1379 and the FLASH access time properly? whether is sui table or not. Check connection lines between SDRAM SDRAM(IC502,IC503) & MT1379 and the works properl y? SDRAM is damaged.
  • Page 13 Does the SLED move Check the connection line of Motor Driver STBY to inner side when it is at STBY signal . Pin is High? outter positi on? Check the rel ated circuit of Motor Driver STBY FMSO. Pin is High? Check the amp circuit on SL+ and SL- output motor driver.
  • Page 14 Check the laser power circuit Laser turns on when LD01 or LD02 output on MT1336 and connecting to reading disc? properly? power transistor. (Q204, Q205) Collector Check therel ated ci rcuit on voltage of power laser power transi stor transistor is OK? ( Q204, Q205) Check cable connection between transistor couput and pick-up head.
  • Page 15 Proper Check connections between signals on A, B, C, Focus ON OK? MT1336 and pick-up head. D of MT1336 Check the related circuit Proper FEO signal on MT1336 FEO sugnal . on MT1336? Check FEO connection between MT1336 and MT1379 Check the related Proper FEO signal Track On OK?
  • Page 16 Audio Normal DAC received Check connection between MT1379 Audio output & Audio DAC. (Check VRST#, ACLK, correct data stream? when disc playback? ABCK, ASDAT3) Normal Check the related circuit of Audio DAC Audio DAC. (Check Audio out? (IC601) out Pin 14, 15,18,19) Check Audio filter, amplify, mute circuit.

  • Page 17: Karaoke Flow

    4. KARAOKE Flow (KARAOKE MODEL ONLY) Start Insert the Mic jack Is the Mic signal at the IC801 pin3. Is the Mic signal at the IC801 Pin 2. Is the Digital Replace IC801. signal output at the Replace the IC5K1. IC5K1 Pin1.

  • Page 18: Details And Waveforms On System Test And Debugging

    DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 1. SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL 1) MT1379 main clock is at 27MHz(X501) 3.8V, 27MHz FIG 1-1 2) MT1379 & MT1336 reset is high active. Power Cord in 5.2VA PWR_CTL(CN505 PIN 7) M_RESET(CN505 PIN 9) URST(IC501 PIN 188) FIG 1-2...
  • Page 19 3) RS232 waveform during procedure(Downloading) TXD(J6 PIN3) RXD(J6 PIN 2) FIG 1-3 4) Flash R/W enable signal during download(Downloading) FRD(IC5A1 PIN 28) FWR(IC5A1 PIN 11) FIG 1-4 3-12...

  • Page 20: Sdram Clock

    2. SDRAM CLOCK 1) MT1379 main clock is at 27MHz(X501) DCLK = 93MHz, Vp-p=2.2, Vmax=2.7V (IC502,IC503 PIN 35) FIG 2-1 3. TRAY OPEN/CLOSE SIGNAL 1) Tray open/close waveform OPEN((CN203 PIN 3) CLOSE(CN203 PIN 2) TROPEN(IC202 PIN 1) TRCLOSE(IC202 PIN 2) FIG 3-1 3-13...
  • Page 21 2) Tray close waveform OPEN((CN203 PIN 3) CLOSE(CN203 PIN 2) TROPEN(IC202 PIN 1) TRCLOSE(IC202 PIN 2) FIG 3-2 3) Tray open waveform OPEN((CN203 PIN 3) CLOSE(CN203 PIN 2) TROPEN(IC202 PIN 1) TRCLOSE(IC202 PIN 2) FIG 3-3 3-14...

  • Page 22: Sled Control Related Signal (No Disc Condition)

    4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION) FMSO(2.0V/1.4V/1.0V) (IC501 PIN 19) STBY(5V) – (IC201 PIN 50) SL+(4.7V/3.6V/1.9V) (IC202 PIN 12) SL-(5.3V/3.7V/2.5V) (IC202 PIN 13) FIG 4-1 5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION) FOSO(1.5V/1.4V/1.3V) (IC501 PIN 12) F+(4.0V/3.6V/3.2V) (IC202 PIN 9) F-(4.0V/3.6V/3.2V) (IC202 PIN 8) FIG 5-1...

  • Page 23: Laser Power Control Related Signal(No Disc Condition)

    6. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION) MDI1(0V/180mV) (IC201 PIN 124) LD01(5.0V//3.5V) IC201 PIN 125) LD02(5.0V/3.6V) (IC201 PIN 126) FIG 6-1 7. DISC TYPE JUDGEMENT WAVEFORM F+(IC202 PIN 9) FE(IC201 PIN 18) RFL(IC201 PIN 19) FIG 7-1 (DVD) 3-16...
  • Page 24 F+(IC202 PIN 9) FE(IC201 PIN 18) RFL(IC201 PIN 19) FIG 7-2 (DVD) F+(IC202 PIN 9) FE(IC201 PIN 18) RFL(IC201 PIN 19) FIG 7-3 (CD) 3-17...

  • Page 25: Focus On Waveform

    F+(IC202 PIN 9) FE(IC201 PIN 18) RFL(IC201 PIN 19) FIG 7-4 (CD) 8. FOCUS ON WAVEFORM FE(IC201 PIN 18) FOSO(IC501 PIN12) F+(IC202 PIN 9) F-(IC202 PIN 8) FIG 8-1 (DVD) 3-18...

  • Page 26: Spindle Control Waveform (No Disc Condition)

    FE(IC201 PIN 18) FOSO(IC501 PIN12) F+(IC202 PIN 9) F-(IC202 PIN 8) FIG 8-2 (CD) 9. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION) DMSO(1.4V/1.8V) (IC501 PIN 18) SP-(3.6V/2.4V) (IC202 PIN 10) SP+(3.6V/4.8V) (IC202 PIN 11) FIG 9-1 3-19...

  • Page 27: Tracking Control Related Signal(System Checking)

    10. TRACKING CONTROL RELATED SIGNAL(System checking) TE(IC201 PIN 21) TRSO(IC501 PIN 13) T-(IC202 PIN 7) T+(IC202 PIN 6) FIG 10-1(DVD) TE(IC201 PIN 21) TRSO(IC501 PIN 13) T-(IC202 PIN 7) T+(IC202 PIN 6) FIG 10-2(CD) 3-20...

  • Page 28: Rf Waveform

    11. RF WAVEFORM RFOP(2.3V/1.1V) (IC201 PIN 6) RFON(0.8V/2.0V) (IC201 PIN 7) FIG 11-1 12. MT1379 AUDIO OPTICAL AND COAXIAL OUTPUT (ASPDIF) (IC501 PIN 153) FIG 12-1 3-21...

  • Page 29: Mt1379 Video Output Waveform

    13. MT1379 VIDEO OUTPUT WAVEFORM 1) Full colorbar signal(CVBS) DCLK = 93MHz, Vp-p=2.2, Vmax=2.7V (IC604 PIN 23) FIG 13-1 2) Y (IC604 PIN 21) FIG 13-2 3-22...

  • Page 30: Audio Output From Audio Dac

    3) C DCLK = 93MHz, Vp-p=2.2, Vmax=2.7V (IC604 PIN 26) FIG 13-3 14. AUDIO OUTPUT FROM AUDIO DAC 1) Audio L/R (JK601 PIN 4,5) FIG 14-1 3-23...
  • Page 31 2) Audio related Signal ASDATA3 ASDAT3(IC501 PIN 157) ABCK(IC501 PIN 148) ALRCK(IC501 PIN 149) FIG 14-2 3-24...

  • Page 32: Block Diagrams

    BLOCK DIAGRAMS 1. Overall Block Diagram MA11,BA1 DQM[2:3] MUTE DQ[16:31] ASPDIF Y[1:6] CVBS ASPECT DQM[0:1] DQ[00:15] URST F+,F-,T+,T- SP+,SP- SL+,SL- LOAD+,LOAD- DECK MECHANISM DV7800M'S 3-25...

  • Page 33: Power(Smps) Block Diagram

    2. Power(SMPS) Block Diagram TRANS SWITCHING IC LINE FILTER RECTIFIER DV7800M'S 3-26...

  • Page 34: Servo Block Diagram

    3. SERVO Block Diagram DV7800M'S 3-27...

  • Page 35: Mpeg & Memory Block Diagram

    4. MPEG & MEMORY Block Diagram DV7800M'S 3-28...

  • Page 36: Video & Audio Block Diagram

    5. VIDEO & AUDIO Block Diagram DV7800M'S 3-29...

  • Page 37: Karaoke Block Diagram

    6. KARAOKE Block Diagram(KARAOKE MODEL ONLY) Microphone AUDIO AUDIO Signal MPEG Microphone1 PREAMP (KA741) (MT1379) (CS5331) (CS4391) (BA3308) (Block Digram) 1 The unit turns to KARAOKE MODE with ou-screen lyrics display and melody sound when it play backs VCD or DVD KARAOKE DISC. 2.

  • Page 38: Circuit Diagrams

    CIRCUIT DIAGRAMS IMPORTANT SAFETY NOTICE CUIT. SPECIAL COMPONENTS ARE SHADED ON THE NOTE : SCHEMATIC FOR EASY IDENTIFICATION. 1. Shaded( ) parts are critical for safety. Replace only WHEN SERVICING THIS CHASSIS, UNDER NO CIR- THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIF- with specified part number.

  • Page 39: System Circuit Diagram

    2. SYSTEM CIRCUIT DIAGRAM No Power on Video signal not appeared AUDIO DAC interface VIDEO interface RF & MOTOR DRIVE interface System not working or screen is abnormal System not working or Digitron not display System not operate Digitron all not display Program download fail System not working Video signal Y...

  • Page 40: Rf & Servo Circuit Diagram

    3. RF & SERVO CIRCUIT DIAGRAM CD/DVD LD will not on '02. 12. 26 R14601A 3-35 3-36...

  • Page 41: Timer, 5.1Ch, Scart, Karaoke Circuit Diagram

    4. TIMER, 5.1CH, SCART, KARAOKE CIRCUIT DIAGRAM Power LED abnormal (OPTIONAL PART) Karaoke not operate. Remocon not operate System not operate System not operate or Digitron abnormal or Digital abnormal Key not operate. (OPTIONAL PART) (OPTIONAL PART) 5.1CH Audio Bad '02.

  • Page 42: Av/Jack Circuit Diagram

    5. AV/JACK CIRCUIT DIAGRAM All Video signal isn't appear or bad 2CH Audio out bad. SACD OPTION 2.5V doesn't appeat System not working 2CH Audio out bad. Video Signal Y Video Signal CVBS '02. 12. 26 R14602A Video Signal Color 2CH Audio 3-39 3-40...

  • Page 43: Circuit Voltage Chart

    • CIRCUIT VOLTAGE CHART IC201 IC202 IC501 IC502 IC505 IC510 IC5A1 IC5K1 IC601 IC602 IC604 IC201 IC202 IC501 IC502 IC505 IC510 IC5A1 IC5K1 IC601 IC602 IC604 (MT1336E) (MOTOR) (MT1379) (SDRAM) (EEPROM) (BUFFER) (FLASH) (KARAOKE) (CS4391) (AMP) (MM1623XFBE) (MT1336E) (MOTOR) (MT1379) (SDRAM) (EEPROM) (BUFFER)
  • Page 44 Q201 Q202 Q203 Q204 Q205 IC201 IC202 IC501 IC502 IC505 IC510 IC5A1 IC5K1 IC601 IC602 IC604 (MT1336E) (MOTOR) (MT1379) (SDRAM) (EEPROM) (BUFFER) (FLASH) (KARAOKE) (CS4391) (AMP) (MM1623XFBE) STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY PIN STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY 5.14 4.34...

  • Page 45: Printed Circuit Diagrams

    PRINTED CIRCUIT DIAGRAMS 1. MAIN P.C.BOARD LOCATION GUIDE 3-45 3-46...

  • Page 46: Key P.c.board

    2. KEY P.C.BOARD ( 7 TOOL ) ( 8 TOOL ) ( 9 TOOL ) (Solder Side) (Solder Side) (Solder Side) 3. TIMER P.C.BOARD ( 7 TOOL ) ( 8 TOOL ) LOCATION GUIDE LOCATION GUIDE (Solder Side) (Solder Side) ( 9 TOOL ) LOCATION GUIDE (Solder Side)

  • Page 47: Scart & 5.1Ch P.c.board(Optional Part)

    4. SCART & 5.1CH P.C.BOARD(OPTIONAL PART) 6. KARAOKE P.C.BOARD (KARAOKE MODEL ONLY) LOCATION GUIDE LOCATION GUIDE (Solder Side) (Solder Side) 5. POWER P.C.BOARD LOACTION GUIDE (Solder Side) 3-49 3-50...

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