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Memorex MT2327 Service Manual

Color television receiver
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MT2327
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 MT2327

  • Page 1 MT2327 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~A3-4 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 G - 1 CRT Size / Visual Size 32 inch / 800.1mmV S yste m CRT Type Normal Deflection degree Magnetic Field BV/BH +0.45G/0.18G Color System NTSC Speaker 2Speaker Position Front Size 1.8 x 3.9 Inch Impedance Sound Output 5.0 + 5.0 W 10%(Typical) 4.0 + 4.0 W...
  • Page 5 GENERAL SPECIFICATIONS CH Label Sleep Timer Sound Mute V-chip Rating G - 8 OSD Language English French Spanish G - 9 Clock and Sleep Timer Max Time 120 Min Timer Step On/Off Timer Program(On Timer / Off Timer) Wake Up Timer Timer Back-up (at Power Off Mode) more than G - 1 0...
  • Page 6 GENERAL SPECIFICATIONS Just Clock Function Game Position CH Label VM Circuit Full OSD Premiere Comb Filter Lines Auto CH Memory Hotel Lock Closed Caption Stable Sound Energy Star Power On Memory Favorite CH G - 1 2 Accessories Owner's Manual Language English / French w/Guarantee Card...
  • Page 7 GENERAL SPECIFICATIONS G - 1 6 C arto n Master Carton Content ---- Sets Material Dimensions W x D x H(mm) x -- x -- Description of Origin Gift Box Material Double/WHITE CORRUGATED CARTON Dimensions W x D x H(mm) x 625 x 757 Design...

  • Page 8: 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 9: 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 10 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 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 1 second. Set Key Remocon Key Operations Releasing of V-CHIP PASSWORD.

  • Page 12: 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. Table 1 Enter DATA SET mode by setting VOLUME to minimum.

  • Page 13: Electrical Adjustments

    ELECTRICAL ADJUSTMENTS BEFORE MAKING ELECTRICAL 2. BASIC ADJUSTMENTS ADJUSTMENTS 2-1: RF AGC Read and perform these adjustments when repairing the Place the set with Aging Test for more than 15 minutes. Receive an 63dB ± 1dB monoscope pattern. circuits or replacing electrical parts or PCB assemblies. Connect the digital voltmeter to the TP001.
  • Page 14 ELECTRICAL ADJUSTMENTS 2-6: SUB TINT/SUB COLOR 2-8: VERTICAL SHIFT, VERTICAL LINEARITY Receive the monoscope pattern. Receive the color bar pattern. Using the remote control, set the brightness and contrast Connect the oscilloscope to TP024. to normal position. Activate the adjustment mode display of Fig. 1-1 and Check if the step No.
  • Page 15 ELECTRICAL ADJUSTMENTS 2-13: CONSTANT VOLTAGE 2-16: LEVEL Place the set with Aging Test for more than 15 minutes. Receive a 70dB monoscope pattern. Connect the digital voltmeter to the TP401. Connect the AC voltmeter to the pin 6 of CP601 and the GND.
  • Page 16 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 ELECTRICAL ADJUSTMENTS 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) CRT PCB R803 TP022 CP805 CP806 CD805 R805 TP024 J801 CP803B CP802B CD802 CP803A J705 J701 CP601 J707 FB401 TP001 VR403 VR401 VR404 VR402 TP401 T501 AC IN CP1001 S501B S501A MAIN PCB SPEAKER...

  • Page 18: Block Diagram

    BLOCK DIAGRAM COMB FILTER IC AV/S SW IC SOUND DECORDER IC TONE CONTROL IC IC901 AN5829S IC302 M62420FP IC1501 TC90A45F IC1502 NJM2283M Q701 Q702 BUFFER BUFFER 4 13 9 11 22 21 24 18 19 9 10 2 19 12 14 Q706 BUFFER S_VIDEO...

  • Page 19: Printed Circuit Boards

    PRINTED CIRCUIT BOARDS MAIN/CRT (INSERTED PARTS) STEREO SOLDER SIDE SOLDER SIDE SW105 D104 Q103 R113 _A_V SW102 SW101 SW104 SW103 J704 C710 6.3A125VOR250V FH502 C907 C505_1 W053 W845 W864 R706 W011 R515 R804 W052 R803 F501 W010 FH501 TP022 C910 L101 C713 W117...
  • Page 20 PRINTED CIRCUIT BOARDS MAIN/CRT (CHIP MOUNTED PARTS) SOLDER SIDE R722 R703 R719 R707 R729 R710 R532 R533 R534 C1002 C1004 C919_1 R1015 R1014 C708 R611 C602 R622 R650 R1512 C618 R639 R609 C642 C623_1 IC1502 C636 W855 W866 C1531 R1519 R1517 R518 R1514...

  • Page 21: Micon/Tuner

    MICON/TUNER SCHEMATIC DIAGRAM (MAIN PCB) TU001 ENV56DB6G3 ACCESSORY TM101 R25-1784 R101 R126 C003 2.7K R128 TP001 OS101 RPM7138-H5 FROM/TO POWER +30V PROTECT_A PROTECT SW Q101 R110 DEGAUSS_H KRC101MAT R140 BUFFER R107 47 1/4W Q102 KTA1266 47K 1/4W MICON IC IC101 OEC7072A AUDIO MUTE H_CTL...

  • Page 22: Chroma

    CHROMA SCHEMATIC DIAGRAM L605 56uH (MAIN PCB) R645 10K 1/4W FROM POWER R629_1 R644 W851 UNREG+12V 10 3W X Q603 KTC3203_Y Q604 Q605 TO AV C652 KTC3209_Y KTC3209_Y Q606 KTC3209_Y 0.22 Q608 TU_VIDEO KTC3209_Y 11.3 W829 FROM/TO COMB FILTER C647 C614 R643 STEREO+5V...

  • Page 23: Deflection/Crt

    DEFLECTION/CRT SCHEMATIC DIAGRAM (MAIN PCB) W859 L402 CP802A W825 HF57T18.5*10*10 CP802B B2013H02-5P B2013H02-5P FROM/TO CHROMA C806 CLAMP CLAMP CLAMP CLAMP CLAMP G.OUT G.OUT 470P B G.OUT G.OUT G.OUT B.OUT B.OUT B.OUT B.OUT B.OUT V-OUT IC IC401 LA78041 R.OUT R.OUT R.OUT R.OUT R.OUT CP803A B2013H02-6P...

  • Page 24: Power

    POWER SCHEMATIC DIAGRAM (MAIN PCB) TO CHROMA RELAY DRIVE Q504 D516 KTC3198 UNREG+12V 1SS133 TO DEFLECTION/CRT R521 RY501 UNREG+18V ALKS321 680 2W T501 8140065S W850 R517_1 5A 250V C516 77.4 0.39 TO SOUND 20N_5000FSW 500V 470P 16.9 ICP501 77.4 SOUND+B DEGAUSS COIL L503 20_N5000FSW...

  • Page 25: Sound

    SOUND SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO MICON/TUNER AUDIO_MUTE C303 R309 0.033 B 1.8K C315 C316 C901 R307 0.022 0.47 BUFFER 4.7K Q901 KTA1266 1.8K TONE 136K AMP1 I2C BUS C902 INTERFACE SIMAMP1 BUFFER VOLAMP1 6.5K 6.5K 6.5K Q902 VOLAMP2 CONTROL KTA1266 SIMAMP2 6.5K...
  • Page 26 AV SCHEMATIC DIAGRAM (MAIN PCB) CP701 A2001WV2-4P AUDIO_L AUDIO R S808Y S802Y VIDEO FROM/TO SOUND FRONT_AUDIO_L FRONT_AUDIO_R REAR_AUDIO_R REAR_AUDIO_L C729 R724 C720 R725 P.CON+9V_1 S_VIDEO 1.5K AUDIO_OUT_R J705 BUFFER BUFFER YKF51-5503 AUDIO_OUT_L Q701 Q702 C727 KTC3198 KTC3198 C730 C722 R726 C732 1.8K FROM DEFLECTION/CRT...

  • Page 27: Comb/Filter

    COMB/FILTER SCHEMATIC DIAGRAM (MAIN PCB) W865 FROM/TO CHROMA STEREO+5V C1525 0.1 F C_IN Y_IN C1523 0.01 B C1514 FROM/TO AV 6.3V C1532_1 VIDEO_IN BUFFER V1_SW Q1502 0.22 KTC3199_Y R1508 0.29 C1511 C1502_1 C1512 VI_C_IN VIDEO_OUT 100P SL 6.3V R1501 BUFFER VI_Y_IN Q1501 D.VCC...

  • Page 28: Av Jack

    AV JACK SCHEMATIC DIAGRAM (AV JACK PCB) CD701 CH242001 C712 VIDEO VIDEO AUDIO_R J702 AUDIO_L AV1-06D-3 C711 R705 1/4W AUDIO_L J703 AV1-06D-4 C713 R706 1K 1/4W AUDIO_R J704 AV1-06DS-2 NOTE : THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME NOTE:THE DC VOLTAGE AT EACH PART WAS MEASURED PCB280 OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE...

  • Page 29: Waveforms

    WAVEFORMS MICON/TUNER 12 1V 20µs/div 200mV 20µs/div 1 1V 0.1µs/div 1V 20µs/div 20V 20µs/div 0.5V 20µs/div 29 500mV 200ns/div 3 200mV 20µs/div 9 200mV 20µs/div DEFLECTION/CRT 200mV 5ms/div 14 0.5V 5ms/div 0.5V 5ms/div CHROMA 11 1V 20µs/div 6 0.5V 20µs/div 15 20V 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.
  • Page 30 WAVEFORMS 28 200mV 1ms/div 21 50V 20µs/div 16 2V 20µs/div 200V 20µs/div 22 50V 20µs/div 31 200mV 1ms/div SOUND 10V 5ms/div 25 0.5V 1ms/div 0.5V 1ms/div 10V 5ms/div 26 200mV 1ms/div 0.5V 1ms/div 200mV 1ms/div 50V 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 31: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW J801 PCB110 (CRT PCB ASS'Y) PCB010 (MAIN PCB ASS'Y) FB401 V801 SP1002 TU001 PCB280 (STEREO JACK PCB ASS'Y) SP1001...

  • Page 32: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION A3M002N720 CABINET,FRONT ASSY 701WPJB843 CABINET,FRONT 702WPA0920 CABINET,BACK(1/6) 899HV3T000 HOLDER,ANODE WIRE 722A08A127 SHEET,RATING 723000C005 FILM,DECORATION 741WUA0021 SPRING,EARTH 713WPA0229 GUIDE,REMOCON 724000A002 SHEET,CSA 735WPA0693 BUTTON,FRAME 800WQ00045 FELT SHEET 5x150xT0.5 800WQ0A013 FELT,SHEET 5x30xT0.5 800WQ00054 FELT,SHEET 5x80xT0.8 A3M002N740 CABINET, BACK ASS'Y 800WQ0A008 FELT,SHEET...

  • Page 33: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS DIODES ! R402 R3X181102J R,METAL OXIDE OHM 1W ! D505 D28F30DF60 DIODE RECTIFIER 30DF6-FC ! R408 R4X5T6392F R,METAL 3.9K OHM 1/6W ! D506 D97U01801B DIODE,ZENER MTZJ18B T-77 ! R409 R4X5T6153F...
  • Page 34 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION TRANSISTORS MISCELLANEOUS ! Q802 TCATC3199Y TRANSISTOR SILICON KTC3199_Y-AT CP701 069S240629 CONNECTOR PCB SIDE A2001WV2-4P ! Q803 TCATC3199Y TRANSISTOR SILICON KTC3199_Y-AT CP801 069S320010 CONNECTOR PCB SIDE A2361WV2-2P ! Q804 TCA0042170 TRANSISTOR SILICON...
  • Page 35 M3M0-02N SPEC.NO. W273017 O/R NO.

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