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Memorex MT1098 Service Manual

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MT1098

SERVICE MANUAL

COLOR TELEVISION RECEIVER
ORIGINAL
MFR'S VERSION B
Design and specifications are subject to change without notice.

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Summary of Contents for Memorex MT1098

  • Page 1: Service Manual

    MT1098 SERVICE MANUAL COLOR TELEVISION RECEIVER ORIGINAL MFR’S VERSION B 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 CONTENTS SERVICING NOTICES ON CHECKING ......................A1-1 HOW TO ORDER PARTS..........................A1-1 IMPORTANT..............................A1-1 CONTENTS..............................A2-1 GENERAL SPECIFICATIONS......................... A3-1~A3-4 DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF ANODE CAP......................... B1-1 2. REMOVAL OF DEFLECTION YOKE..................... B2-1 3. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC..............B3-1, B3-2 SERVICE MODE LIST .............................

  • Page 4: General Specifications

    GENERAL SPECIFICATIONS G-1.Outline of the Product 9 inch(222.8mmV):Measured diagonally Color CRT 90 degree deflection G-2.Broadcasting System System G-3.Color System NTSC SECAM or Monochrome signal G-4.NTSC Playback(PAL 60Hz) Not Applicable G-5.NTSC 3.58+4.43/PAL60Hz Not Applicable G-6.Antenna Input Impedance VHF/UHF 75 ohm unbalanced G-7.Tuner and Receiving Contactless Electric tuner 1Tuner System...
  • Page 5 GENERAL SPECIFICATIONS G-18.Regulation Safety NEMKO FEMKO DEMKO IEC65 SEMKO HOMOLO SABS SISIR AS3159 DENTORI GOST NONE Radiation SABA HOMOLO CISPR13 DENTORI AS/NZS NONE X-Radiation DHHS DENTORI NONE G-19.Temperature : Operation ºC ~ 40 ºC Storage ºC ~ 60 ºC G-20.Operating Humidity Less than G-21.Clock and Timer Sleep Timer...
  • Page 6 GENERAL SPECIFICATIONS G-26.OSD Language OSD Language Setting Not Applicable G-27.Speaker NONE Layout Front Side Bottom Size/Quantity inches x Imp. Power Max. 10 % W (Typical) G-28.EXT Speaker : Imp. Power Max. 10 % W (Typical) G-29.Carton Master Carton: Need No Need Content: ---- Material:...
  • Page 7 GENERAL SPECIFICATIONS G-32.Switch Front Power Channel Up/Reset Volume Up/Set+ System Select Channel Down/Enter Volume Down/Set- Main Power S W Sub Power Menu TV/AV Picture Rear AC/DC TV/CATV Selector Degauss Main Power S W G-33.Magnetic Field BV : +0.45G BV : +0.35G BV : +0.25G...

  • Page 8: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF ANODE CAP INSTALLATION Clean the spot where the cap was located with a small Read the following NOTED items before starting work. amount of alcohol. (Refer to Fig. 1-3.) After turning the power off there might still be a potential voltage that is very dangerous.

  • Page 9: Removal Of Deflection Yoke

    DISASSEMBLY INSTRUCTIONS 2. REMOVAL OF DEFLECTION YOKE (Refer to Fig. 2-1) Loosen the screw 1. Remove the Convergence • Purity Magnet in the direction of arrow (A). Remove the 3 Wedges. Remove the Deflection Yoke in the direction of arrow (A).
  • Page 10 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. 3-3.) REMOVAL NOTE Put the Masking Tape (cotton tape) around the Flat...
  • Page 11 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. 3-8.) new IC fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily.

  • Page 12: Service Mode List

    SERVICE MODE LIST This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. To enter SERVICE MODE, unplug AC cord till lost actual clock time. Then press and hold Vol (-) button of main unit and remocon key simultaneously for more tan 1 second.

  • Page 13: Electrical Adjustments

    ELECTRICAL ADJUSTMENTS 1. BEFORE MAKING ELECTRICAL 1. RF AGC DELAY ADJUSTMENTS 2. VIDEO LEVEL 3. FM LEVEL Read and perform these adjustments when repairing the circuits or replacing electrical parts or PCB assemblies. 4. OSD H 5. CUT OFF CAUTION 6.
  • Page 14 ELECTRICAL ADJUSTMENTS 2-7: SUB CONTRAST 1. BRIGHT Receive the monoscope pattern. (RF Input) 2. CONTRAST Activate the adjustment mode display of Fig. 2-1 and press 3. COLOR the channel button (4) on the remote control to select 4. TINT "PICTURE". The Fig. 2-4 appears on the display. 5.
  • Page 15 ELECTRICAL ADJUSTMENTS 2-11: VERTICAL SIZE Receive the monoscope pattern. Using the remote control, set the brightness and contrast to normal position. Activate the adjustment mode display of Fig. 2-1 and press the channel button (1) on the remote control to select "H/V".

  • Page 16: Purity And Convergence

    ELECTRICAL ADJUSTMENTS PURITY AND CONVERGENCE 3-3: STATIC 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.

  • Page 17: Major Components Location Guide

    MAJOR COMPONENTS LOCATION GUIDE TP201 L205 VR501 TP401 TU001 FB401 CP101 FOCUS VOLUME SCREEN VOLUME MAIN J801 TP023 D3-1...

  • Page 18: Block Diagram

    BLOCK DIAGRAM 9V REG IC P.CON9V IC601 KIA7809API P.CON5V H.VCC DEGAUSS P.CON5V L502 180V CHROMA IC V.OUT IC201 TUNER LA76814BM-MPB TU001 H.OUT SOUND CRT PCB J801 P.CON5V HEATER V.IN1 V.SW IC IC702 V.IN2 NJM2245L P.CON9V V.OUT A/V JACK TUNER AUDIO J701 A.IN1 A.SW IC...
  • Page 19 PRINTED CIRCUIT BOARDS MAIN/CRT (INSERTED PARTS) SOLDER SIDE CP801 W037 C801 R806 CP803B Q803 C819_3 CP802B S801 R813 Q801 W036 Q802 R804 TP024 TP023 TP022 C004 W829 R601 C212 R602 L202 W824 W819 CF201 C353 C204 IC502 5A125V W054 Q702 R205 C720 W067...
  • Page 20 PRINTED CIRCUIT BOARDS MAIN/CRT (CHIP MOUNTED PARTS) SOLDER SIDE R145 C110 C109 C112 C106 C122 R106 R147 R110 C104 R518 R108 C107 R520 R124 R517 R504 C504 R505 C520 R501 R507 C719 R353 R703_1 R420 R419 R512 R606 R414 R653 R704 R612 R705...
  • Page 21 MICON/TUNER SCHEMATIC DIAGRAM (MAIN PCB) TU001 TECC1040PG32D ACCESSORY OS101 B001 PIC-26043LM-2 BL01RN1-A63 W824 TM101 CD501 R25-1213 SI-PC107-67 R133 5V REG. IC IC103 KIA7805API PICTURE SW106 SKHVBED010 R136 MENU 12K 1/4W X-RAY SW 12.5 SW107 Q103 SKHVBED010 R114_1 DTC114TS S100X 150 1W TV/AV SW108 FROM/TO POWER...
  • Page 22 CHROMA SCHEMATIC DIAGRAM (MAIN PCB) VIDEO R667 BUFFER Q605 2.2K W833 2SA1015Y R619 C623 6.3V 1000 B601 BL02RN1-R62 TP201 L205 R624 3602038 C628 0.047 TF FROM/TO AV/SOUND C610 100P CH P.CON+9V C218 SWD_VIDEO 3.3 2.2 0.001 DIVERSITY C217 R208 TUNER_VIDEO SWD_AUDIO 0.47 CLMP...
  • Page 23 DEFLECTION/CRT SCHEMATIC DIAGRAM (MAIN PCB) W840 FROM CHROMA CLAMP CLAMP CLAMP CLAMP CLAMP G.OUT G.OUT G.OUT G.OUT G.OUT B.OUT B.OUT B.OUT B.OUT B.OUT R.OUT R.OUT R.OUT R.OUT R.OUT CD802 CP802A CP802B 6814038 V-OUT IC 51048-0510 51048-0510 IC401 LA7840 THERMAL PUMP PROTECTION AMP - FROM POWER...
  • Page 24 POWER SCHEMATIC DIAGRAM (TV MAIN PCB) R518 DEGAUSS SW Q508 3.3K DTA114ES CP501 Q507 DC JACK CR2AM-8-F8 R520 TV-50P-02-L1 C515 J501 DEGAUSS COIL PROTECTOR HEC0824-010010 L502 250V ECQ-E Q506 RY501 8R090007 DTC114ES ALKS329 D504 R512 MTZJ16B FROM/TO MICON/TUNER 11.5 S100Y DC POWEWR SW Q509 DTA114ES...
  • Page 25 AV/SOUND SCHEMATIC DIAGRAM (TV MAIN PCB) C301 W802 C353 FROM MICON/TUNER R355 AUDIO_MUTE R353 47K 1/4W POWER EXT.SPEAKER/DIVERSITY J702 TC38-001-05-T W805 FROM/TO CHROMA C355 W846 AUDIO_OUT P.CON+9V TU_AUDIO_OUT SWD_AUDIO TUNER_VIDEO HS351 SWD_VIDEO 763WSA0009 VIDEO SW IC IC702 NJM2245L AUDIO SW IC IC701 NJM2234L BUFFER...
  • Page 26 WAVEFORMS MICON/TUNER 0.5V 10µs/div 13 200mV 20µs/div 0.5V 10µs/div 0.5V 10µs/div 14 200mV 5ms/div 1.0V 20µs/div 10 200mV 10µs/div 15 0.5V 20µs/div 1.0V 5ms/div CHROMA 20.0mV 1ms/div 11 100mV 0.1µs/div 16 0.5V 20µs/div 200mV 50µs/div 12 10.0V 20µs/div 17 0.5V 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.
  • Page 27 WAVEFORMS DEFLECTION/CRT 18 200mV 5ms/div 23 10.0V 5ms/div 24 10.0V 20µs/div 19 20.0V 20µs/div 20 5.0V 20µs/div 25 10.0V 20µs/div 21 200V 20µs/div 26 10.0V 20µs/div 22 5.0V 5ms/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 28: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW J801 PCB110 (CRT PCB) FB401 L502 J701 V801 TU001 PCB010 (MAIN PCB)

  • Page 29: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION A3I506I720 CABINET,FRONT ASS'Y 735WPAA423 REMOCON HOLDER 701WPJB504 CABINET,FRONT 713WPA0101 GUIDE,REMOCON 735WPAA402 BUTTON,FRAME 735WPAA403 BUTTON,HOLDER 702WPA0666 CABINET,BACK(1/4) 722A08A096 SHEET,RATING 7260000321 SHEET,CRT SERVICEMAN 741WUA0019 SPRING,EARTH 8117540A64 SCREW,TAPPING(B0) TRUSS 4x16 8110630A04 SCREW,TAP TITE(P) BRAZIER 3x10 8110630804 SCREW,TAP TITE(P)

  • Page 30: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS DIODES ! R001 R3X181563J R,METAL OXIDE 56K OHM 1W D610 D1VT001330 DIODE,SILICON 1SS133T-77 R3U28A563J R,METAL OXIDE 56K OHM 2W D701 D97U06R81B DIODE,ZENER MTZJ6.8B T-77 R114 R3X101151J R,METAL 150 OHM 1W D702...
  • Page 31 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION P.C.BOARD ASSEMBLIES PCB110 A3I506I110 PCB ASS'Y TC9306A MISCELLANEOUS B001 024AT03655 CORE BEADS BL01RN1-A63T6 B501 024AT03481 CORE,BEADS BL02RN1-R62T2 B502 024AT03481 CORE,BEADS BL02RN1-R62T2 B504 024AT03655 CORE BEADS BL01RN1-A63T6 B601 024AT03481 CORE,BEADS BL02RN1-R62T2 B701 024AT03655 CORE BEADS BL01RN1-A63T6 CD501...
  • Page 32 SPEC.NO. M3I5-06I O/R NO. WIX3011...

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