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Memorex MT1125A Service Manual

Color television receiver
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MT1125A
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 MT1125A

  • Page 1 MT1125A SERVICE MANUAL COLOR TELEVISION RECEIVER ORIGINAL MFR’S VERSION B Design and specifications are subject to change without notice.
  • Page 2 MT1125A SERVICE MANUAL COLOR TELEVISION RECEIVER REVISION 1 MFR’S VERSION G MFR’S VERSION IC101 OEC7044A A63AHC26X A63AFW36X OEC7044B Please file this revision with the original version.
  • Page 3 NOTE FOR THE REPLACING OF MEMORY IC MFR'S VERSION F MFR'S VERSION G ADDRESS DATA DATA DIFFERENCES Alteration of IC. MFR'S VERSION F MFR'S VERSION G REF.NO PART NO. DESCRIPTION PART NO. DESCRIPTION IC101 I56F07044A IC OEC7044A I56F07044B IC OEC7044B PCB010 A3I055H01A MAIN PCB ASS'Y TMX458A A3I055F01A MAIN PCB ASS'Y...
  • Page 4 MT1125A SERVICE MANUAL COLOR TELEVISION RECEIVER REVISION 1 MFR’S VERSION D MFR’S VERSION IC101 OEC3041A OEC3041B Please file this revision with the original version.
  • Page 5 DIFFERENCES Alteration of IC. MFR'S VERSION B MFR'S VERSION D REF.NO PART NO. DESCRIPTION PART NO. DESCRIPTION IC101 I53F53041A IC OEC3041A I53F53041B IC OEC3041B PCB010 A3I011H01A MAIN PCB ASS'Y TM9441A A3I011H01B MAIN PCB ASS'Y TM9441A MAIN PCB's are interchangeable. SPEC.NO. M3I0-11H O/R NO.

  • Page 6: 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 7: 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~A3-5 DISASSEMBLY INSTRUCTIONS ........................ B-1, B-2 SERVICE MODE LIST ..........................CONFIRMATION OF USING HOURS ......................NOTE FOR THE REPLACING OF MEMORY IC ..................ELECTRICAL ADJUSTMENTS ........................

  • Page 8: 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( 626 mmV):Measured diagonally Color CRT 100 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...
  • Page 9 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 10 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 P o s i t i o n Front Side Bottom Size 1.5 x 2.7 inches Imp.
  • Page 11 G E N E R A L S P E C I F I C A T I O N S G-31.Other Features Auto Degauss Auto Search Full OSD Auto Shut Off CH Allocation Premiere Canal+ Comb Filter CATV(181CH) Channel Lock Auto CH Memory Anti-Theft Just Clock Function...
  • Page 12 G E N E R A L S P E C I F I C A T I O N S G-34.Remote Control Unit: RC- 74 Power Source: Battery UM - 4 x 2 Total 28 Key Power Quick View TV/A V Stand By Status...

  • Page 13: 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 14 DISASSEMBLY INSTRUCTIONS 4. Insert one end of the Anode Support into the anode button, then the other as shown in Fig. 1-5. Support Fig. 1-5 Confirm that the Support is securely connected. Put on the Rubber Cap without moving any parts. 2.

  • Page 15: 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 16: 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 17 ELECTRICAL ADJUSTMENTS 2-5: SUB BRIGHTNESS (AV) 2-7: SUB TINT/SUB COLOR (AV) Receive the monoscope pattern. (Audio Video Input) Receive the color bar pattern. (Audio Video Input) Using the remote control, set the brightness and Connect the synchro scope to pin 1 of CP101 and the contrast to normal position.
  • Page 18 ELECTRICAL ADJUSTMENTS 2-11: HORIZONTAL PHASE 1. LEVEL ADJ Receive the color bar pattern. 2. SEPARATION 1 Using the remote control, set the brightness and 3. SEPARATION 2 contrast to normal position. Activate the adjustment mode display of Fig. 2-1 and press the channel button (1) on the remote control.
  • Page 19 ELECTRICAL ADJUSTMENTS 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.

  • Page 20: Major Components Location Guide

    MAJOR COMPONENTS LOCATION GUIDE L205 TP201 VR502 TU001 TP401 FB401 VR401 CP101 FOCUS VOLUME SCREEN VOLUME MAIN D3-1...

  • Page 21: Block Diagram

    BLOCK DIAGRAM STEREO IC TONE CONTROL IC IC701 AN5828NS IC705 M62420SP 22 21 24 18 19 9 10 2 19 P.CON+9V MUTE SW Q705 Q704 Q703 IC351 LA4600 TU001 Q707 V.SIZE/VIDEO/CHROMA/SYNC IC Q351 MUTE Q701 IC201 LA76814BM-MPB BUFFER BUFFER SPEAKER MUTE Q708 BUFFER...

  • Page 22: Printed Circuit Boards Main/Crt/Av/Stereo

    PRINTED CIRCUIT BOARDS MAIN/CRT/AV/STEREO (INSERTED PARTS) SOLDER SIDE SW104 SW103 SW101 SW105 SW102 TP022 R803 C123 W020 R802 W019 FH501 FH502 Q801 S811X W017 C105 R805 W018 TP024 R815 R804 C508 R131 W015 W016 D602 C617 W013 6.3A 125V F501 R515 TP023 R807...
  • Page 23 PRINTED CIRCUIT BOARDS MAIN/STEREO (CHIP MOUNTED PARTS) SOLDER SIDE R762 Q709 Q708 Q707 Q705 R754 R749 R723 IC701 R708 Q704 R730 R727 R751 C767 R732 C762 Q703 R729 R743 C769 Q701 Q702 Q706 C707 R403 R420 R740 R217 Q605 Q201 R614 R204 C363...
  • Page 24 ACCESSORY MICON/TUNER SCHEMATIC DIAGRAM TM101 R25-1055 TU001 TECC1040PG31A OS101 PIC-28143SY-2 Vout R133 47 1/4W S804Y TO VIDEO SWITCH/IN/OUT R136 CH UP R134 SW101 X-RAY SW Q103 SKHVBED010 2SC2412K FROM/TO SOUND/AMP CH DOWN C134 SW102 AUDIO_MUTE SKHVBED010 I2C_SCL MICON IC I2C_SDA IC101 OEC3041A FROM/TO POWER...
  • Page 25 CHROMA SCHEMATIC DIAGRAM C655 R6621K R663 2.2K VIDEO BUFFER Q605 2SA1037AK VIDEO BUFFER Q604 2SA1015Y S802Y L205 3602038 R624 C628 0.047 M S809Y TP201 C610 100P SL C218 3.3 2.2 0.001 B C217 R208 0.47 CLMP CLMP W810 X-RAY VIDEO R203 TRAP FILTER...
  • Page 26 DEFLECTION/CRT SCHEMTIC DIAGRAM CD802 S806X S809X S813Y CP802B 51048-0510 CP802A 51048-0510 122E053701 FROM/TO 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 K001 V-OUT IC IC401 LA7841 8115529 K002 8115529...
  • Page 27 POWER SCHEMATIC DIAGRAM 127.0 126.0 FROM/TO CHROMA P.CON+9V 127.0 +B 100V DRIVE RELAY DRIVE 100V DRIVE Q503 Q504 UNREG+10V Q502 D516 127.5 2SC4160- 2SC2001_L 2SA1371 OEC-YAC1 1SS133 126.8 127.0 TO DEFLECTION/CRT 100V SWITCHING S811X Q501 P.CON+125V 2SC3468 RY501 SDT-S-109LMR DEGAUSS COIL C516 L503...
  • Page 28 SOUND AMP SCHEMATIC DIAGRAM FROM/TO STEREO CP702A IMSA-9130B-18 I2C_SDA I2C_SCL P.CON+9V P.CON+5V SOUND_L SOUND_R TU_AUDIO_OUT AUDIO_OUT_L AUDIO_OUT_R P.CON+9V FRONT_AUDIO_L FRONT_AUDIO_R REAR_AUDIO_L REAR_AUDIO_R FROM/TO VIDEO SWITCH/IN/OUT REAR_AUDIO_R REAR_AUDIO_L FRONT_AUDIO_R FRONT_AUDIO_L AUDIO_OUT_R AUDIO_OUT_L FROM CHROMA TU_AUDIO_OUT P.CON+9V FROM MICON/TUNER I2C_SCL I2C_SDA SOUND AMP IC AUDIO_MUTE IC351 LA4600...
  • Page 29 VIDEO SWITCH/IN/OUT SCHEMATIC DIAGRAM F_A/V_IN(STEREO) S808X J702 CD701 CP701 JPJ1187-010010 CH27081A 8283_0712_00_000 S802X W849 C705 R733 A_IN_R BUFFER Q702 2SC2412K A_IN_L V_IN FROM/TO SOUND AMP C744 BUFFER R734 Q701 FRONT_AUDIO_L 2SC2412K FRONT_AUDIO_R REAR_AUDIO_R REAR_AUDIO_L AUDIO_OUT_R AUDIO_OUT_L VIDEO SWITCH IC IC702 NJM2245L FROM DEFLECTION/CRT P.CON+9V...
  • Page 30 STEREO SCHEMATIC DIAGRAM FROM/TO SOUND AMP CP702B IMSA-9130S-18L I2C_SDA I2C_SCL P.CON+9V P.CON+5V SOUND_L SOUND_R TU_AUDIO_OUT TU_AUDIO_OUT C752 TP701 L702 100uH AUDIO_OUT_L L704 AUDIO_OUT_R 22uH P.CON+9V FRONT_AUDIO_L FRONT_AUDIO_R R752 C775 1.8K 0.033 B REAR_AUDIO_L C770 C777 REAR_AUDIO_R C729 0.022 B 0.47 B BUFFER Q703 2SA1037AK...

  • Page 31: Micon/Tuner

    WAVEFORMS MICON/TUNER 200mV 5ms/div 0.5V 20µs/div 12 20V 20µs/div 2 0.5V 20µs/div 0.5V 20µs/div 13 200mV 20µs/div 3 200mV 20µs/div 200mV 20µs/div 0.5V 5ms/div 10 0.5V 20µs/div 1V 20µs/div 200mV 5ms/div CHROMA 5 0.5V 1ms/div 1V 0.5ms/div 16 1V 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 32: Deflection/Crt

    WAVEFORMS SOUND AMP 1V 20µs/div 10V 5ms/div 0.5V 1ms/div DEFLECTION/CRT 18 0.5V 5ms/div 10V 5ms/div 1V 1ms/div STEREO 19 20V 20µs/div 50V 20µs/div 30 200mV 1ms/div 20 2V 20µs/div 25 50V 20µs/div 31 200mV 1ms/div POWER 26 50V 20µs/div 200V 20µs/div 32 5.0V 20ms/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.
  • Page 33 WAVEFORMS 33 500mV 5µs/div 34 20.0V 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 34: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW J801 PCB110 (CRT PCB ASS'Y) L503 PCB290 (STEREO PCB ASS'Y) V801 TU001 PCB010 SP351 (MAIN PCB ASS'Y) PCB250 (AV PCB ASS'Y)

  • Page 35: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION A3I011H720 CABINET,FRONT ASS'Y HEAT SINK HEAT SINK METAL SPACER COATING CLIP 741WUA0016 SPRING,EARTH 701APJ0078 CABINET,FRONT 713WPA0096 GUIDE,REMOCON 7230006856 SHEET,CAUTION 735WPA0426 BUTTON ASS'Y 702APA0104 CABINET,BACK 722A080005 SHEET,RATING 7230006924 FILM,DECORATION 7232020733 SHEET,BRAND 759WPA0006 HOLDER,ANODE WIRE 762WPA0009 HOLDER,CRT WIRE 8994201000 HOLDER,CRT WIRE 769WSA0009 WASHER,CRT T=1...

  • Page 36: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS DIODES ! R401 R4X5T4104F R, METAL 100K OHM 1/4W ! D410 D28TELS6N6 DIODE, RECTIFIER 10ELS6N-TA1B2 ! R404 R801R7472J RC 4.7K OHM 1/10W ! D411 D28TELS6N6 DIODE, RECTIFIER 10ELS6N-TA1B2 ! R405 R4X5T4183F R, METAL...
  • Page 37 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION TRANSISTORS MISCELLANEOUS ! Q802 TC3Q040750 TRANSISTOR, SILICON 2SC4075-YAC OS101 077Q014003 REMOTE RECEIVER PIC-28143SY-2 ! Q803 TC3Q040750 TRANSISTOR, SILICON 2SC4075-YAC ! RY501 0560Q10114 RELAY SDT-SS-109DM COILS &TRANSFORMERS ! SP351 070C533014 SPEAKER 070C533014...
  • Page 38 M3I0-11H SPEC.NO. A993514 O/R NO.

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