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Memorex MT2205 Service Manual

Color television receiver
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MT2205

SERVICE MANUAL

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

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Summary of Contents for Memorex MT2205

  • Page 1: Service Manual

    MT2205 SERVICE MANUAL COLOR TELEVISION RECEIVER ORIGINAL MFR’S VERSION A Design and specifications are subject to change without notice.
  • Page 2 MT2205 SERVICE MANUAL COLOR TELEVISION RECEIVER REVISION 1 MFR’S VERSION C The ORIGINAL SERVICE MANUAL of MFR’S VERSION A is mistaken for MFR’S VERSION B. MFR’S VERSION IC101 OEC3041A OEC3041B Please file this revision with the original version.
  • Page 3 Change of IC101 DIFFERENCES MFR'S VERSION B MFR'S VERSION C REF.NO PART NO. DESCRIPTION PART NO. DESCRIPTION IC101 I53F53041A IC OEC3041A I53F53041B IC OEC3041B PCB010 A3G813C01A MAIN PCB ASS'Y TM9436A A3G813C01B MAIN PCB ASS'Y TM9436A SPEC.NO. M3G8-13C O/R NO. W043007...

  • Page 4: 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 5: 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~A3-4 DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF ANODE CAP ....................... SERVICE MODE LIST ..........................CONFIRMATION OF USING HOURS ...................... NOTE FOR THE REPLACING OF MEMORY IC ..................

  • Page 6: General Specifications

    G E N E R A L S P E C I F I C A T I O N S G-1.Outline of the Product inch(544.5mmV):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) G-5.NTSC 3.58+4.43/PAL60Hz G-6.Antenna Input Impedance...
  • Page 7 G E N E R A L S P E C I F I C A T I O N S G-17. P rotector: Power Fuse G-18.Regulation Safety NEMKO FEMKO DEMKO IEC65 SEMKO HOMOLO SABS SISIR AS3159 DENTORI GOST NONE Radiation SABA HOMOLO...
  • Page 8 G E N E R A L S P E C I F I C A T I O N S G-26.OSD Language OSD Language Setting Not Applicable G-27.Speaker 6 1/3 x 2 1/4 inches Imp. ohm x Max 2.5 + 2.5 W (Typical) 10% 2.0 + 2.0 W (Typical) G-28.EXT Speaker G-29.Carton...
  • Page 9 G E N E R A L S P E C I F I C A T I O N S G-32.Switch Front Power(Tact) Channel Up Volume Up System Select Channel Down Volume Down Main Power SW Sub Power Rear AC/DC TV/CATV Selector Degauss...

  • Page 10: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF ANODE CAP 3. After one side is removed, pull in the opposite direction to 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 11: Service Mode List

    SERVICE MODE LIST This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. To enter the Service Mode, press both set key and remote control key for more than 2 seconds. Set Key Remocon Key Operations Releasing of V-CHIP PASSWORD.

  • Page 12: Electrical Adjustments

    ELECTRICAL ADJUSTMENTS 1. BEFORE MAKING ELECTRICAL 1. RF AGC DELAY ADJUSTMENTS 2. VIDEO LEVEL Read and perform these adjustments when repairing the 3. FM LEVEL circuits or replacing electrical parts or PCB assemblies. 4. OSD H 5. CUT OFF CAUTION 6.
  • Page 13 ELECTRICAL ADJUSTMENTS 2-5: SUB TINT/SUB COLOR 2-8: VERTICAL SIZE Receive the color bar pattern. Receive the crosshatch pattern. Connect the synchro scope to pin 1 of CP101 and the Using the remote control, set the brightness and pin 6 (GND) of CP101. contrast to normal position.
  • Page 14 ELECTRICAL ADJUSTMENTS [ TV ] OSD H Fig. 2-8 2-12: SEPARATION 1, 2 Receive the stereo signal. Connect the AC voltmeter to CP351 through stereo filter (400Hz, 2KHz). Activate the adjustment mode display of Fig. 2-1 and press the channel button (7) on the remote control. The Fig.

  • Page 15: 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 16: Major Components Location Guide

    MAJOR COMPONENTS LOCATION GUIDE L205 CP351 TP201 TU001 FB401 CP101 VR401 FOCUS VOLUME SCREEN VOLUME MAIN D3-1...

  • Page 17: Block Diagram

    BLOCK DIAGRAM SOUND AMP STEREO ICBUS TONE CONTROL SOUND IC351 AN5277 STEREO IC701 AN5828NS IC705 M62420SP CH-UP CH-DOWN 18 19 9 10 7 14 20 ATT.CONT. VOL. UP P.CON+9V VOL. DOWN POWER V.SIZE/VIDEO/CHROMA/SYNC TU001 SP352 IC201 LA76814M-MPB MICON IC101 OEC3041A AUDIO VOL.

  • Page 18: Printed Circuit Boards Main/Crt

    PRINTED CIRCUIT BOARDS MAIN/CRT (INSERTED PARTS) SOLDER SIDE CP803A S805Y C448 CP802A TP501 VR401 IC601 S801Y CP101 C626 R422 C420 IC501 D603 R509 W023 S801X C004 R001 R429_1 D410 FB401 W823 R002 HS501 W022 D001 W818 C001 L704 C002 D408 R753 C403 D404...
  • Page 19 PRINTED CIRCUIT BOARDS MAIN/CRT (CHIP MOUNTED PARTS) SOLDER SIDE R606 R645 R112 R636 R632 C612 C632 R646 R661 R647 R209 R201 R202 C645 C610 R618 C218 R208 C216 R622 R203 C206 C207 R357 R210 R656 R204 C647 R655 C648 R624 R664 R666 R218...
  • Page 20 MICON/TUNER SCHEMATIC DIAGRAM TM101 R25-0924 ATC001 TU001 ENV56D67G3 NXC0032-010010 OS101 PIC-28143SY-2 Vout R133 47 1/4W CH UP 20" SW101_1 SKHVBED010 CH DOWN 5V REG. 20" SW102_1 IC103 KIA78L05BP-AT SKHVBED010 R136 CC001 R134 X-RAY SW Q103 2SC1815Y 12.5 FROM/TO STEREO/SOUND AMP C134 C103 R137...
  • Page 21 IF/CHROMA SCHEMATIC DIAGRAM VIDEO BUFFER VIDEO BUFFER Q605 Q604 2SA1015Y 2SA1015Y D609 R652 1SS133 L205 3602038 R624 R660 R662 TP201 C628 0.047 M JWF-50K-1 C610 100P SL C218 3.3 2.2 0.001 Y C217 R208 0.47 CLMP CLMP X-RAY VIDEO R203 TRAP FILTER HOR GND...
  • Page 22 DEFLECTION/CRT SCHEMATIC DIAGRAM CD802 CP802B 51048-0510 CP802A 51048-0510 122P053001 FROM/TO IF/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 P.CON+5V V-OUT IC401 LA7840 THERMAL PUMP CD801_1 CP801_1 PROTECTION CP83035A TS-80P-03-V1 AMP -...
  • Page 23 POWER SCHEMATIC DIAGRAM CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE 4A 125V (F501) FUSE. ATTENTION: POUR UNE PROTECTION CONTINUE LES RISQUES 4A 125V D’INCEIE N’UTILISER QUE DES FUSIBLE DE MEME TYPE 4A 125V (F501). DEGAUSE COIL L502 CP502...
  • Page 24 STEREO/SOUND AMP SCHEMATIC DIAGRAM FROM/TO MICON/TUNER I2C_SDA I2C_SCL AUDIO_MUTE L704 FROM IF/CHROMA 22uH P.CON+9V TU_AUDIO_OUT R752 C775 FROM/TO POWER 1.8K 0.033 M C770 C777 0.022 0.47 1.8K TONE 136K AMP1 I2C BUS INTERFACE SIMAMP1 VOLAMP1 6.5K 6.5K 6.5K VOLAMP2 R729 C748 CONTROL SIMAMP2...

  • Page 25: Micon/Tuner

    WAVEFORMS MICON/TUNER 200mV. 5ms/div 0.5V. 20µs/div 1V. 0.5ms/div 20V. 20µs/div 0.5V. 20µs/div 0.5V. 20µs/div 200mV. 20µs/div 0.5V. 20µs/div 200mV. 20µs/div 200mV. 5ms/div 200mV. 20µs/div 14 0.5V. 5ms/div IF/CHROMA 1V. 20µs/div 0.5V. 20µs/div 0.5V. 2ms/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 26: Deflection/Crt

    WAVEFORMS 50V. 20µs/div 16 1V. 20µs/div 200V. 20µs/div STEREO/SOUND AMP 27 200mV 1ms/div 1V. 20µs/div 10V. 5ms/div DEFLECTION/CRT 18 0.5V. 5ms/div 5V. 5ms/div 28 200mV 1ms/div 20V. 20µs/div 50V. 20µs/div 2V. 20µs/div 50V. 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 27: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW J801 PCB110 (CRT PCB ASS'Y) L502 FB401 V801 ATC001 TU001 PCB010 (MAIN PCB ASS'Y) SP352 SP351...

  • Page 28: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION A3G813C720 CABINET,FRONT ASS'Y 701WPJA614 CABINET,FRONT 711WPAA065 PLATE,DISPLAY 713WPAA010 GUIDE,REMOCON 735WPBA039 BUTTON,CHANNEL 735WPAA153 BUTTON,BASE 723000A807 FILM,DECORATION 769WSAA003 WASHER 9.5x22xT2 800WR0A003 SHEET,CRT SUPPORT 741WUA0001 SPRING,EARTH HEAT SINK HEAT SINK HEAT SINK METAL SPACER 8995034000 CORD CLIP UL CO.

  • Page 29: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS DIODES ! R177 R5Y2CF122J R, CEMENT 1.2K OHM 10W D605 D94TA6RB12 DIODE, ZENER HZ6B2L TD ! R401 R4X5T4104F R, METAL 100K OHM 1/4W D606 D1VT001330 DIODE, SILICON 1SS133T-77 ! R404 R903N8302J RC...
  • Page 30 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION MISCELLANEOUS CP802A 067R005019 WIRE HOLDER 51048-0510 CP802B 067R005019 WIRE HOLDER 51048-0510 CP803A 067R104019 WIRE HOLDER 51052-0400 CP803B 067R104019 WIRE HOLDER 51052-0400 CUS001 800WF00004 CUSHION-A ! F501 081PA04002 FUSE 237004 ! FB401 043220046F TRANSFORMER, FLYBACK 3220046F FH501 06710T0006 HOLDER, FUSE...
  • Page 31 M3G8-13C SPEC.NO. W953004 O/R NO.

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