1. Manuals
  2. Brands
  3. Memorex Manuals
  4. TV
  5. MT2325
  6. Service manual

Memorex MT2325 Service Manual

Color television receiver
Hide thumbs Also See for MT2325:
Table of Contents

Advertisement

Quick Links

Download this manual See also: Owner's Manual
MT2325

SERVICE MANUAL

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

Advertisement

Table of Contents
loading

Related Manuals for Memorex MT2325

Summary of Contents for Memorex MT2325

  • Page 1: Service Manual

    MT2325 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 ....................... SERVICE MODE LIST ..........................CONFIRMATION OF USING HOURS ......................NOTE FOR THE REPLACING OF MEMORY IC ..................

  • Page 4: General Specifications

    GENERAL SPECIFICATIONS G-1.Outline of the Product inch( 806.0 mmV):Measured diagonally Color CRT 110 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 VHF/UHF 75 ohm unbalanced G-7.Tuner and Receiving Contactless Electric tuner 1Tuner System 2Tuner System...
  • Page 5 GENERAL SPECIFICATIONS G-17. P rotector: Power Fuse G-18.Regulation S afety 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...
  • Page 6 GENERAL SPECIFICATIONS G-26.OSD Language OSD Language Setting Not Applicable G-27.Speaker : P o s i t i o n Front Side Bottom Size inches 8 ohm x Power 3.5 + 3.5 W 10% 2.6 + 2.6 W (Typical) 4 ohm x (form OCT Order) Power 5.0 + 5.0 W...
  • Page 7 GENERAL SPECIFICATIONS G-32.Switch Front Power(Tact) Channel Up/Reset Volume Up/Set Up System Select Channel Down/Enter Volume Down/Set Down Main Power S W Sub Power Menu:Vol Up + Vol Down Rear AC/DC TV/CATV Selector Degauss Main Power S W G-33.Magnetic Field BV : +0.45G BV : +0.35G...

  • Page 8: 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 9: 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 10: 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 11 ELECTRICAL ADJUSTMENTS 2-4: SUB TINT/SUB COLOR (TV) 2-5: SUB TINT/SUB COLOR (AV) Receive the color bar pattern. (RF Input) Receive the color bar pattern. (Audio Video Input) Connect the synchro scope to pin 1 of CP101 and the Connect the synchro scope to pin 1 of CP101 and the pin 6 (GND) of CP101.
  • Page 12 ELECTRICAL ADJUSTMENTS 2-9: HORIZONTAL PHASE 2-14: CONSTANT VOLTAGE Receive the color bar pattern. Place the set with Aging Test for more than 15 minutes. Using the remote control, set the brightness and Using the remote control, set the brightness and contrast contrast to normal position.

  • Page 13: Purity And Convergence

    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 14: Major Components Location Guide

    MAJOR COMPONENTS LOCATION GUIDE TP401 VR502 VR205 TP201 TU001 J701 CP101 FB401 FOCUS VOLUME SCREEN VOLUME MAIN D3-1...

  • Page 15: Block Diagram

    BLOCK DIAGRAM STEREO TONE CONTROL IC701 AN5829S IC705 M62420SP 18 19 9 10 14 20 P.CON+9V F_A/V_IN J702 Q704 Q703 IC751 TC90A45F J703 J704 SPEAKER BUFFER BUFFER COMB FILTER TU001 MUTE SW SP351 AV/S SW 13 15 4 Q351 CHROMA IC351 LA4600 IC202 NJM2283M Q701,Q723...

  • Page 16: Printed Circuit Boards Main/Crt/Comb

    PRINTED CIRCUIT BOARDS MAIN/CRT/COMB (INSERTED PARTS) SOLDER SIDE CC801 R801 CP802A CD802 C807 R817 Q810 W086 CF201 Q812 D801 W005 CP805 W865 C811 CP802B C812 R810 L202 C650 L751 R819 W004 R812 C805 L706 R811 W872 C211 W003 C810 C635 Q811 W002 L803...
  • Page 17 PRINTED CIRCUIT BOARDS MAIN/CRT/COMB (CHIP MOUNTED PARTS) SOLDER SIDE R101 R151 R152 R155 R785 C787 R787 R712 R784 R783 Q734 Q733 Q704 R715 Q701 C742 R749 R786 R707 R733 C734 R780 Q703 Q723 Q731 R742 Q103 IC701 R788 R420 R419 Q732 R726 R113...

  • Page 18: Micon/Tuner

    MICON/TUNER SCHEMATIC DIAGRAM (MAIN PCB) TU001 TECC1040PG31A OS101 PIC-28143SY-2 ACCESORRY Vout R133 TM101 TO COMB FILTER SBBD00031A CP703 IMSA-9130B-04 POWER AT+5.6V R136 R134 X-RAY SW TO STEREO/MONO Q103 2SC2412K I2C_SCL I2C_SDA CH UP TO JACK/SOUND SW101 SKHVBED010 C134 TO SOUND 50V KA AUDIO_MUTE CH DOWN...

  • Page 19: Chroma

    CHROMA SCHEMATIC DIAGRAM (MAIN PCB) C229 C655 R662 C231 50V KA W813 AV/S SW IC202 VIDEO NJM2283M BUFFER Q605 2SA1037AK C227 R221 C220 10P CH VIDEO BUFFER FROM/TO Q604 JACK/SOUND C622 C623 2SA1037AK 0.01 B 6.3V 1000 VIDEO_OUT R624 V1_Y_IN L205 TP201 3602038...

  • Page 20: Deflection/Crt

    DEFLECTION/CRT SCHEMATIC DIAGRAM (MAIN PCB) CD802 TO CRT 2E055308 FROM/TO CHROMA CLAMP CLAMP CLAMP R.OUT R.OUT R.OUT G.OUT G.OUT G.OUT B.OUT B.OUT B.OUT P.CON+5V CP802A 51048-0510 V-OUT IC401 LA7841 (CRT PCB) THERMAL PUMP PROTECTION CD801 06CP82035A FROM/TO CRT 12.6 25.8 25.3 CD805 06CP82035A...

  • Page 21: Tv Power

    TV POWER SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO MICON/TUNER POWER P.CON+117V +B 100V DRIVE Q503 2SC4160 127.0 126.0 TO DEFLECTION/CRT 100V DRIVE RELAY DRIVE 127.0 Q502 127.5 P.CON+117V Q504 2SA1371 D516 2SC2001_L 126.8 127.0 1SS133 HS504 100V SWITCHING Q501 763WAA0046 2SC3468 TO SOUND RY501 SDT-SS-109DM...

  • Page 22: Sound

    SOUND SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO STEREO/MONO SOUND_L SOUND_R P.CON+5V C365 MUTE_SW Q352 2SC2412K R355 MUTE_SW Q353 2SC2412K FROM DEFLECTION/CRT P.CON+5V SOUND AMP IC351 LA4600 ATT. RIPPLE FILTER OUTPUT GND STAND-BY INPUT GND 13.9 C358 R360 W834 R363 FROM TV POWER KANP R357 CP351...

  • Page 23: Jack/Sound

    JACK/SOUND SCHEMATIC DIAGRAM (MAIN PCB) FROM CHROMA P.CON+9V C707 TO STEREO/MONO FRONT_AUDIO_L FRONT_AUDIO_R J704 REAR_AUDIO_R JPJ1023-01-020 REAR_AUDIO_L R733 A_IN_R C733 A_IN_L J703 0.022 B JPJ2023-01-030 V_IN J702 C786 JPJ2023-01-040 R734 R703 BUFFER Q701 2SA1037AK BUFFER Q723 2SC2412K C746 C774 R715 AV SW IC702 NJM2245M...

  • Page 24: Stereo/Mono

    STEREO/MONO SCHEMATIC DIAGRAM (MAIN PCB) FROM MICON/TUNER I2C_SDA I2C_SCL FROM/TO SOUND P.CON+5V SOUND_L SOUND_R FROM CHROMA TU_AUDIO_OUT L702 TU_AUDIO_OUT C790 P.CON+9V TP701 100uH L704 FROM JACK/SOUND 22uH FRONT_AUDIO_R R790 C798 FRONT_AUDIO_L C748 1.8K 0.033 B AUDIO_OUT_L SOUND_R C796 C800 AUDIO_OUT_R BUFFER C729 REAR_AUDIO_L...
  • Page 25 COMB/FILTER SCHEMATIC DIAGRAM (COMB PCB) C773 C764 0.01 B R758 BUFFER R763 FROM/TO CHROMA Q753 2SC2412K CP702 DL751 IMSA-9130S-08L 380R2501 A_OUT_MUTE_L R764 A_OUT_MUTE_R VIDEO_IN BUFFER Q752 Y_OUT C219 2SC2412K P.CON+5V 6.3V C_OUT C761 0.01 B C752 C762 82P CH R751 BUFFER R765 D.VCC...

  • Page 26: Comb/Filter

    WAVEFORMS DEFLECTION/CRT MICON/TUNER COMB/FILTER 0.5V 10U/div /div 6 0.5V 20U/div 12 10V 20U/div 33 1V 20U/div 50V 20U/div 17 1V 20U/div DEFLECTION/CRT CHROMA 23 10V 5V/div 34 1V 20U/div 2 0.5V 20U/div 7 200mV 5V/div 13 200mV 20U/div 18 0.5V 10V/div STEREO/MONO 30 50mV 0.2V/div 35 1V 20U/div...

  • Page 27: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW J801 PCB110 (CRT PCB ASS'Y) L503 V801 PCB330 SP352 PCB010 (COMB PCB ASS'Y) (MAIN PCB ASS'Y) SP351...

  • Page 28: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION A3I401B720 CABINET,FRONT ASS'Y 761WPA0184 HOLDER,DECK 761WPA0185 HOLDER,M/PCB ---- HEAT SINK ---- HEAT SINK ---- HEAT SINK ---- HEAT SINK ---- HEAT SINK ---- METAL SPACER 771WPA0238 PLATE,JACK 8995034000 CORD CLIP UL CO. ---- COATING CLIP 741WUA0016 SPRING,EARTH...

  • Page 29: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS DIODES ! R001 R3X181273J R,METAL OXIDE 27K OHM 1W ! D402 D94TA11B11 DIODE,ZENER HZ11B1L TD R390 R001T6221J 220 OHM 1/6W D403 D28T11E1N1 DIODE,SILICON 11E1N-TA1B2 R391 R001T6221J 220 OHM 1/6W ! D404...
  • Page 30 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION TRANSISTORS JACKS Q353 T8YJ2412K0 TRANSISTOR,SILICON 2SC2412KT146 R,S ! J801 066C130017 SOCKET,CATHODE RAY TUBE CVT3275-5101 SWITCHES Q401 TDKU023350 TRANSISTOR,SILICON 2SD2335(LS) ! Q402 TC3Q026210 TRANSISTOR,SILICON 2SC2621(D,E)-RAC SW101 0504201T31 SWITCH,TACT SKHVBED010 Q403...
  • Page 31 SPEC.NO. M3I4-01B O/R NO. A993530...
  • Page 32 MT2325 SERVICE MANUAL COLOR TELEVISION RECEIVER REVISION 1 MFR’S VERSION B MFR’S VERSION SPEAKER MSF-30SB05 MSF-30SB05-1 Please file this revision with the original version.
  • Page 33 DIFFERENCES Alteration of SPEAKER. MFR'S VERSION A MFR'S VERSION B REF.NO PART NO. DESCRIPTION PART NO. DESCRIPTION SP351 070W036001 SPEAKER MSF-30SB05 070W036003 SPEAKER MSF-30SB05-1 SP352 070W036001 SPEAKER MSF-30SB05 070W036003 SPEAKER MSF-30SB05-1 R361 R801R7151J RC 150 OHM 1/10W R801R7101J RC 100 OHM 1/10W R362 R801R7151J RC 150 OHM 1/10W...

Table of Contents