Grundig WF70-3020 Service Manual
  1. Manuals
  2. Brands
  3. Grundig Manuals
  4. TV
  5. WF70-3020
  6. Service manual
Grundig WF70-3020 Service Manual

Grundig WF70-3020 Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
WF70-3020
SERVICE MANUAL
COLOR TELEVISION RECEIVER
ORIGINAL
MFR'S VERSION A
Design and specifications are subject to change without notice.

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the WF70-3020 and is the answer not in the manual?

Questions and answers

Related Manuals for Grundig WF70-3020

Summary of Contents for Grundig WF70-3020

  • Page 1 WF70-3020 SERVICE MANUAL COLOR TELEVISION RECEIVER ORIGINAL MFR’S VERSION A Design and specifications are subject to change without notice.

  • Page 2: Servicing Notices On Checking

    SERVICING NOTICES ON CHECKING 1. KEEP THE NOTICES 6. AVOID AN X-RAY As for the places which need special attentions, Safety is secured against an X-ray by consider- they are indicated with the labels or seals on the ing about the cathode-ray tube and the high cabinet, chassis and parts.

  • Page 3: Table Of Contents

    CONTENTS SERVICING NOTICES ON CHECKING ...................... A1-1 HOW TO ORDER PARTS ........................... A1-1 IMPORTANT ..............................A1-1 CONTENTS ..............................A2-1 GENERAL SPECIFICATIONS ........................A3-1~A3-3 DISASSEMBLY INSTRUCTIONS 1.REMOVAL OF ANODE CAP ....................... B1-1 2.REMOVAL AND INSTALLATION OF FLAT PACKAGE IC ..............B2-1, B2-2 SERVICE MODE LIST ..........................

  • Page 4: General Specifications

    GENERAL SPECIFICATIONS CRT Size / Visual Size 28 inch / 656.7mmV System CRT Type FLAT Deflection degree Magnetic Field BV/BH +0.45G/0.18G Color System Speaker 2 Speaker Position Front Size 1.8 x3.9 Inch Impedance Sound Output 10.0+10.0 W 10%(Typical) 9.0+9.0 W PAL60Hz Tuning Broadcasting System...
  • Page 5 GENERAL SPECIFICATIONS OSD Language English French Spanish Germany Italian OSD Language Setting English Clock and Sleep Timer Max Time 120 Min Timer Step On/Off Timer Program(On Tim / Off Tim) Wake Up Timer Timer Back-up (at Power Off Mode) more than G-10 Remote Unit...
  • Page 6 GENERAL SPECIFICATIONS G-12 Accessories Owner's Manual Language English w/Guarantee Card Remote Control Unit Rod Antenna Poles Pole Terminal type Loop Antenna Terminal U/V Mixer DC Car Cord (Center+) Guarantee Card Warning Sheet Circuit Diagram Antenna Change Plug Service Facility List Important Safeguard Dew/AHC Caution Sheet AC Plug Adapter...

  • Page 7: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS 3. After one side is removed, pull in the opposite direction to 1. REMOVAL OF ANODE CAP remove the other. Read the following NOTED items before starting work. NOTE After turning the power off there might still be a potential Take care not to damage the Rubber Cap.

  • Page 8: Removal And Installation Of Flat Package Ic

    DISASSEMBLY INSTRUCTIONS REMOVAL AND INSTALLATION OF When IC starts moving back and forth easily after desoldering completely, pickup the corner of the IC using FLAT PACKAGE IC a tweezers and remove the IC by moving with the IC desoldering machine. (Refer to Fig. 2-3.) REMOVAL NOTE Put the Masking Tape (cotton tape) around the Flat...
  • Page 9 DISASSEMBLY INSTRUCTIONS INSTALLATION When bridge-soldering between terminals and/or the soldering amount are not enough, resolder using a Thin- Take care of the polarity of new IC and then install the tip Soldering Iron. (Refer to Fig. 2-8.) new IC fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily.

  • Page 10: Service Mode List

    SERVICE MODE LIST This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. SERVICE MODE will operate by the procedures below. 1. Set to the STANDBY at the minimum of volume. 2. Press the "Entry key" on the remote control for SERVICE MODE for more than 3 seconds. 3.

  • Page 11: When Replacing Eeprom( Memory) Ic

    WHEN REPLACING EEPROM (MEMORY) IC If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to ensure correct data settings while making reference to TABLE 1. Note: No need setting for the position of the mark @ due to the adjustment value. CD CF Table 1 Set to the STANDBY at the minimum of volume.

  • Page 12: Electrical Adjustments

    ELECTRICAL ADJUSTMENTS 1. BEFORE MAKING ELECTRICAL 2. BASIC ADJUSTMENTS ADJUSTMENTS 2-1: CONSTANT VOLTAGE Read and perform these adjustments when repairing the Place the set with Aging Test for more than 5 minutes. circuits or replacing electrical parts or PCB assemblies. Using the remote control, set the brightness and contrast to normal position.
  • Page 13 ELECTRICAL ADJUSTMENTS 2-5: WHITE BALANCE 2-8: VERTICAL POSITION NOTE: Adjust after performing CUT OFF adjustments. NOTE: Adjust after performing adjustments in section 2-7. Place the set with Aging Test for more than 15 minutes. Receive the monoscope pattern. Receive the white 100% signal from the Pattern Using the remote control, set the brightness and Generator.
  • Page 14 ELECTRICAL ADJUSTMENTS 2-11: COLOR CENT 2-14: PICTURE SIZE (4:3) Receive the color bar pattern. (RF Input) Receive the monoscope pattern. Using the remote control, set the brightness, contrast Change the wide screen mode to NORMAL. and color to normal position. Using the remote control, set the brightness and Connect the oscilloscope to TP804.
  • Page 15 ELECTRICAL ADJUSTMENTS 2-16: PICTURE SIZE (CINEMA) 2-18: PICTURE SIZE (14:9) Receive the monoscope pattern. Receive the monoscope pattern. Change the wide screen mode to CINEMA. Change the wide screen mode to NORMAL. Using the remote control, set the brightness and Using the remote control, set the brightness and contrast to normal position.
  • Page 16 3-3: STATIC CONVERGENCE 3. PURITY AND CONVERGENCE ADJUSTMENTS NOTE Adjust after performing adjustments in section 3-2. NOTE Receive the crosshatch pattern from the color bar Turn the unit on and let it warm up for at least 30 generator. minutes before performing the following adjustments. Combine red and blue of the 3 color crosshatch pattern Place the CRT surface facing east or west to reduce the on the center of the screen by adjusting the pair of 4...

  • Page 17: Major Components Location Guide

    MAJOR COMPONENTS LOCATION GUIDE SW501 VR501 T501 FB401 T402 TP501 FOCUS 1 VOLUME FOCUS 2 VOLUME SCREEN VOLUME MAIN PCB IC101 TP804 IC201 J801 TU001 TP001 CRT PCB VR601 CP101 J701 POWER PCB D3-1...

  • Page 18: Block Diagram

    BLOCK DIAGRAM TU001 TUWRF4EK-776F2 I2C DATA/CLK I2C DATA/CLK MICON W/T.TEXT V.OUT IC101 OECF003A IC401 STV9306 P.CON + 5V I2C DATA/CLK CHROMA P.CON + 25V I2C DATA/ I2C DATA/CLK IC201 STV2247C V.OUT OSD (TEXT) V.OUT AT + 5V H.OUT OSD (TEXT) OSD (TEXT) I2C DATA/CLK I2C DATA/CLK...

  • Page 19: Printed Circuit Boards Main/Crt

    PRINTED CIRCUIT BOARDS MAIN/CRT (INSERTED PARTS) SOLDER SIDE L801 CP1001 S810X R808 W009 W830 W008 R585 IC582 C585 W091 R804 IC1001 C581 W835 Q810 HS1001 IC601 W127 R806 W118 W140 W122 W001 W072 Q581 W090 Q853 W828 Q812 W121 Q811 W129 W805 W903...
  • Page 20 PRINTED CIRCUIT BOARDS MAIN/CRT (CHIP MOUNTED PARTS) SOLDER SIDE R710 SHORT Q711 C727 C732 C726 R705 R709 C722 IC102 R115 R132 C720 R133 R138 R702 R134 C909 Q712 Q708 R126 C120 Q710 Q709 C914 C913 Q706 Q707 C918 C941 R726 Q703 Q705 R586...

  • Page 21: Power

    PRINTED CIRCUIT BOARDS POWER (INSERTED PARTS) SOLDER SIDE CP801A CD801 W024 R436 CP852A CD852 TP501 W023 R453 Q406 R463 CP401 T402 R431_1 W035 W888 W886 Q407 W020 C412 R452 R402 R447 R418 W883 FB401_1 R419 R450 W028 W884 D409 D403 L401 W881 D421...
  • Page 22 PRINTED CIRCUIT BOARDS POWER (CHIP MOUNTED PARTS) SOLDER SIDE Q199 R528 C513 Q506 R509 R523 R531 C541 C543 R535 SH501 R455 R454 R543 R538 Q412 C427 R412 C429 C436 C445 Q403 R433 C405 R410 R413 R416 C408 R417 R462 R414 R415 R461 Q409...

  • Page 23: Micon/Text/Tuner

    MICON/TEXT/TUNER SCHEMATIC DIAGRAM NOTE: THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME NOTE: THE DC VOLTAGE AT EACH PART WAS MEASURED (TV MT PCB) WITH THE DIGITAL TESTER WHEN THE COLOR BROADCAST PH005 OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE TU001 TUWRF4EK-776F2 WAS RECEIVED IN GOOD CONDITION AND PICTURE IS NORMAL.

  • Page 24: Vif/Sif/Chroma

    VIF/SIF/CHROMA SCHEMATIC DIAGRAM (TV MT PCB) VR601 R632 C639 39K 1/4W METAL 0.001 C636 R626 R627 C632 150P 180P R634 C633 SIF BUFFER VIF PRE.AMP Q204 L206 C204 220P CH Q201 2SC2412K R206 CF202 2SC2814 BLK.SW 0.22uH 0.001 B TSF5372P Q607 GNDOUTOUT KRC111SRTK...

  • Page 25: 21Pin

    21PIN SCHEMATIC DIAGRAM (TV MT PCB) W804 R712 C718 VIDEO OUT 75 1/4W C723 BUFFER R719 Q701 KTA1266 VIDEO IN FOR VCR FROM/TO NICAM/DOLBY/SOUNDAMP/BEE P.CON+8V L701 R702 L IN SCART_A_IN2_L 22uH 8.2K SCART_A_IN2_R SCART_A_OUT2_L L702 SCART_A_OUT2_R L OUT AUX SW Q708 SCART_A_IN1_L 22uH...
  • Page 26 NICAM/DOLBY/SOUNDAMP/BEE SCHEMATIC DIAGRAM (TV MT PCB) STEREO SOUND AMP W819 IC1001 AN5277 FROM/TO POWER S807Y C921 R901 C925 R903 C927 ATT. ATT. CONT. RIPPLE 0.0033 0.033 CP702B A2001WV2-10P FILTER INPUT GND MUTE OUTPUT GND STAND-BY AT+8V CP1001 AT+5V 29.0 15.0 31.1 13.2 14.9...
  • Page 27 CRT/SVM SCHEMATIC DIAGRAM (TV MT PCB) FROM/TO DEFLECTION CP852B A2001WV2-5P R855 330 1/2W P.CON+25V L802 R804 R889 L852 FROM/TO VIF/SIF/CHROMA 150uH 0607 12K 2W 22 1/2W 22uH TP804 R828 W895 L853 B2013H02-3P CP853B 2.7K 1/4W 47uH CONTROL 138.3 25.0 R813 C871 R887 Q856...
  • Page 28 DEFLECTION SCHEMATIC DIAGRAM (POWER PCB) R415 2.2M R413 R431_1 V.POSI 3.9K 1/4W 25.6 14.7 12.2 DOWN OUT Q406 2SD863 V.POSI 10.2 UP OUT Q407 KTA1281_Y 10.2 D415 D416 V.PARABORA Q409 MTZJ5.6B MTZJ5.6B 2SC2412K 25.6 21.6 L402 BUFFER ELC18B501lN Q408 21.1 25.6 26.1 12.1...
  • Page 29 POWER SCHEMATIC DIAGRAM (POWER PCB) BT001 R03(AB)2PXGPI OS101_1 BT002 R03(AB)2PXGPI PIC-37143SY TM101 SBKM00025A R517 C516 D199_1 500V 470P 3W X R532 D505 W855 SLR-342VCT32 4.5 5.0 RN_3Z 3W X D523 R537 D506 RELAY SW MTZJ5.6B LED DRIVE C528 1SS133 Q505 C191 Q199 3W X...
  • Page 30 WAVEFORMS MICON/TEXT/TUNER 11 2V 20µs/div 2V 1µs/div 1V 20µs/div 12 2V 20µs/div 0.5V 20µs/div 2V 5ms/div 3 2V 20µs/div 0.5V 20µs/div 2V 20µs/div 1V 20µs/div 9 1V 20µs/div 14 2V 20µs/div VIF/SIF/CHROMA 15 1V 20µs/div 2V 5ms/div 1V 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 31: Nicam/Dolby/Soundamp/Bee

    WAVEFORMS 16 200mV 10µs/div 21 100mV 0.5ms/div 26 1V 0.5ms/div 200mV 10µs/div 22 0.5V 0.5ms/div 27 1V 0.5ms/div 0.5V 0.5ms/div 200mV 10µs/div 28 0.5V 0.5ms/div 29 200mV 0.5ms/div 200mV 10µs/div 1V 0.5ms/div NICAM/DOLBY/SOUNDAMP/BEE 30 0.5V 0.5ms/div 100mV 0.5ms/div 25 1V 0.5ms/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 32: Deflection

    WAVEFORMS 31 0.5V 0.5ms/div 36 50V 20µs/div 54 2V 20µs/div 37 1V 20µs/div 55 10V 5ms/div 0.5V 0.5ms/div DEFLECTION 2V 5ms/div 0.5V 0.5ms/div 56 200V 5ms/div 57 200V 5ms/div 50V 20µs/div 5.0V 5ms/div 58 5V 20µs/div 50V 20µs/div 53 0.5kV 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 33: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW J801 PCB110 (CRT PCB) L503 V801 SP1001...
  • Page 34 MECHANICAL EXPLODED VIEW FB401 PCB020 (POWER PCB) SW501 PCB010 (MAIN PCB)

  • Page 35: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION A3K802G720 CABINET,FRONT ASSY 752WSAA006 PLATE , SHIELD 752WSAA008 SHIELD,CASE 752WSAA013 SHIELD,LID 752WSA0087 SHIELD,IC 752WSA0086 SHIELD,IC 755WPA0025 COVER,PCB 701UPJ0302 CABINET,FRONT 711UPD0072 PLATE,FRONT 713UPA0018 GLASS,LED 702UPA0183 CABINET,BACK 709WPA0023 CABINET HOLDER 7235440002 BADGE,BRAND 7225440015 SHEET,RATING 735UPB0010 BUTTON,POWER 761WPAA053 HOLDER,PCB...

  • Page 36: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS DIODES R402 R3X181R68J R,METAL OXIDE 0.68 OHM 1W D415 D97U05R61B DIODE,ZENER MTZJ5.6B T-77 R419 R3X28B100J R,METAL OXIDE OHM 3W D416 D97U05R61B DIODE,ZENER MTZJ5.6B T-77 R428 R3X18A181J R,METAL OXIDE 180 OHM 2W...
  • Page 37 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION COILS &TRANSFORMERS IC901 I0QF021500 NJM2150AM L402 02D1000001 COIL ELC16B501EN IC902 I19FF34110 MSP3411G L403 02D3000056 COIL ELC16B501HN IC1001 I0FSP52770 AN5277 L404 022R00036A COIL,LINEARITY ELH5L6140N TRANSISTORS L501 029T000097 COIL,LINE FILTER 1R5A123F28Y Q199...
  • Page 38 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION MISCELLANEOUS CP704A 067U008029 WIRE HOLDER B2013H02-8P CP704B 069S280629 CONNECTOR PCB SIDE A2001WV2-8P CP801A 067U004029 WIRE HOLDER B2013H02-4P CP801B 069S240629 CONNECTOR PCB SIDE A2001WV2-4P CP802A 067U005049 WIRE HOLDER B2013H02-5P CP802B 067U005049 WIRE HOLDER B2013H02-5P CP852A 067U005049 WIRE HOLDER...
  • Page 39 WF70-3020 SERVICE MANUAL COLOR TELEVISION RECEIVER REVISION 1 MFR’S VERSION B, C PRODUCT MFR’S VERSION IC101 IMPROVEMENT ORIGINAL OECF001A (OTP) Change of HORIZONTAL SIZE OECF001A (MASK) Design and specifications are subject to change without notice.
  • Page 40 Change of HORIZONTAL SIZE ELECTRICAL REPLACEMENT PARTS LIST MFR’S VERSION B MFR’S VERSION A DESCRIPTION REF. NO. PART NO. DESCRIPTION PART NO. L402 02D1000001 COIL ELC16B501EN COIL CHOKE ELC18B501LN 02D3000057 MAIN PCB ASS'Y (VERSION A) MAIN PCB ASS'Y (VERSION B) A3K802G020K PCB020 A3K802G020K...

Table of Contents