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Memorex MT2271S Service Manual

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MT2271S
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 MT2271S

  • Page 1 MT2271S 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 FALT PACKAGE IC............B2-1, B2-2 SERVICE MODE LIST ..........................

  • Page 4: General Specifications

    GENERAL SPECIFICATIONS CRT Size / Visual Size 27 inch / 675.1mmV System CRT Type Normal Deflection degree Magnetic Field BV/BH +0.45G/0.18G Color System NTSC Speaker 2Speaker Position Front Size 1.5 x 2.7 Inch Impedance Sound Output 2.5 + 2.5 W 10%(Typical) 2.0 + 2.0 W NTSC3.58+4.43 /PAL60Hz...
  • Page 5 GENERAL SPECIFICATIONS CH Label Sleep Timer Sound Mute V-chip Rating OSD Language English French Spanish OSD Language Setting English Clock and Sleep Timer Max Time 120 Min Timer Step On/Off Timer Program(On Tim / Off Tim) Wake Up Timer Timer Back-up (at Power Off Mode) more than G-10 Remote...
  • Page 6 GENERAL SPECIFICATIONS Channel Lock 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 Favorite CH G-12 Accessories Owner's Manual Language English / Spanish w/Guarantee Card Remote Control Unit Rod Antenna...
  • Page 7 GENERAL SPECIFICATIONS G-16 Carton Master Carton Content ---- Sets Material Dimensions W x D x H(mm) x -- x -- Description of Origin Gift Box Material Double/Brown Dimensions W x D x H(mm) x 558 x 655 Design As per Buyer's Description of Origin Natural Dropping At 1 Corner / 3 Edges / 6 Drop Test...

  • 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 Falt 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: 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. circuits or replacing electrical parts or PCB assemblies. Receive an 60dB monoscope pattern. Connect the digital voltmeter to the W013.
  • Page 13 ELECTRICAL ADJUSTMENTS 2-6: SUB TINT/SUB COLOR 2-8: 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 Adjust the VR402 until the SHIFT quantity of the OVER press the channel button (22) on the remote control to SCAN on upside and downside becomes minimum.
  • Page 14 ELECTRICAL ADJUSTMENTS 2-13: CONSTANT VOLTAGE 2-16: LEVEL Place the set with Aging Test for more than 15 minutes. Receive a 80dB monoscope pattern. Connect the digital voltmeter to the TP402. Connect the AC voltmeter to the pin 2 of J707. Set condition is AV MODE without signal.
  • Page 15 ELECTRICAL ADJUSTMENTS 3-3: STATIC CONVERGENCE 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. minutes before performing the following adjustments.
  • Page 16 ELECTRICAL ADJUSTMENTS 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) CRT PCB TP022 CP806 TP024 CP701A CP802B J702 CD801 AV PCB J705 J701 J707 CP601 IC901 FB401 VR401 TU001 TP402 VR402 CP401 VR502 T501 CP1001 AC IN CP701B S501A S501B SPEAKER MAIN PCB...

  • Page 17: Block Diagram

    BLOCK DIAGRAM AV/S SW IC SOUND DECORDER IC TONE CONTROL IC IC901 AN5829S IC1502 NJM2283M IC302 M62420SP Q701 Q702 BUFFER BUFFER 22 21 24 18 19 9 10 2 19 9 11 12 14 Q706 P.CON + 9V BUFFER S_VIDEO J705 Q1001 MUTE SW...

  • Page 18: Printed Circuit Boards Main/Crt/Av

    PRINTED CIRCUIT BOARDS MAIN/CRT/AV (INSERTED PARTS) SOLDER SIDE OS101 S806Y S805X _A_V 6.3A125VOR250V FH501 F501 FH502 TP022 TP024 CP806 C505 W140 S501B R118 S501A TP023 Q405 R404 W104 R806 D616 CD501 R405 W045 R617 W111 R1519 R114 Q806 Q607 Q804 W112 D615 R1518...
  • Page 19 PRINTED CIRCUIT BOARDS MAIN/CRT/AV (CHIP MOUNTED PARTS) SOLDER SIDE R722 R142 IC901 R141 R307 R306 R310 R532 R533 R534 C708 R437 C408 R710 R1001 R615 R611 C602 R622 R1015 R1006 C618_1 C1004_1 R1011 R639 R1014 C108 C1521 R1520 R819 C809 C801_2 C1528_1 R816 R815...
  • Page 20 MICON/TUNER SCHEMATIC DIAGRAM (MAIN PCB) ACCESSORY TU001 ENV56DB6G3 TM101 RC-DW040 R101 R126 FROM/TO SOUND R002 C003 2.7K R128 TO DEFLECTION/CRT AT+40V OS101 PIC-37143SY AT+5V H_CTL FROM/TO POWER R001 AT+40V 2.7K 1/4W R110 R140 1K 1/4W R107 1/4W 47K 1/4W TO SOUND MICON IC DEGAUSS_H IC101...
  • Page 21 CHROMA SCHEMATIC DIAGRAM (MAIN PCB) R645 FROM POWER UNREG+12V R629 Q603 KTC3203_Y Q604 Q605 C652 KTC3203_Y KTC3203_Y FROM/TO JACK/SOUND Q606 4.89 KTC3203_Y 0.22 AUDIO_OUT_L 11.3 AUDIO_OUT_R TU_VIDEO Q608 KTC3203_Y FROM/TO COMB/FILTER C647 Y_IN S804Y CF603 C_IN SFSRA4M50CF00-A0 R646 S804X STEREO+5V 1.69 8.34 7.71...
  • Page 22 DEFLECTION/CRT SCHEMATIC DIAGRAM (MAIN PCB) CP802A CP802B B2013H02-10P B2013H02-10P 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 V-OUT IC IC401 LA78041 V_FEEDBACK HEATER HEATER HEATER HEATER THERMAL V_OUT PROTECTION...
  • Page 23 POWER SCHEMATIC DIAGRAM (MAIN PCB) TO CHROMA 6.3A 125V UNREG+12V CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE FUSE RELAY DRIVE 6.3A 125V(F501) Q504 D516 KTC3198 T501 ATTENTION: POUR UNE PROTECTION CONTINUE LES RISQUES D’INCEIE 8135075S 1SS133 N’UTILISER QUE DES FUSIBLE DE MEME TYPE...
  • Page 24 SOUND SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO MICON/TUNER AUDIO_MUTE FROM/TO CHROMA C303 R309 0.033 B 1.8K C315 C316 R307 0.022 0.47 BUFFER 4.7K Q901 2SA733(C)-T(P,Q) 1.8K TONE 136K AMP1 I2C BUS INTERFACE SIMAMP1 BUFFER VOLAMP1 6.5K 6.5K 6.5K Q902 VOLAMP2 CONTROL 2SA733(C) SIMAMP2 6.5K...
  • Page 25 JACK/SOUND SCHEMATIC DIAGRAM (MAIN PCB) FRONT_A/V_IN(STEREO) J702 JPJ1187-010010 CD701 CU243501 C702 R733 A_IN_R C701 A_IN_L R734 V_IN CP701A CP701B B2013H02-4P A2001WV2-4P FROM/TO SOUND FRONT_AUDIO_L FRONT_AUDIO_R S802X S802Y REAR_AUDIO_R S801X S801Y REAR_AUDIO_L S_VIDEO J705 YKF51-5503 C729 R724 PCB250 AUDIO_OUT_R TEAA90 0.026 BUFFER R725 Q702...
  • Page 26 COMB/FILTER SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO CHROMA C_IN STEREO+5V Y_IN TO JACK/SOUND R1508 V1_SW R1513 VIDEO_IN VI_C_IN VIDEO_OUT VI_Y_IN S_VIDEO AV/S SW IC IC1502 NJM2283M C1505 C1528_1 TO SOUND 220P B R1510 STEREO+5V C1521 C1527 R1520 10P CH FROM MICON/TUNER ON_TIMER C1524 0.01...

  • Page 27: Micon/Tuner

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

  • Page 29: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW J801 PCB110 (CRT PCB) L503 J701 J707 V801 TU001 PCB010 (MAIN PCB) SP1001 PCB250 (AV PCB)

  • Page 30: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION 899HV3T000 HOLDER,ANODE WIRE 701APJA106 CABINET,FRONT 702APAA005 CABINET,BACK 711WPCA043 BADGE,BRAND 722A08A114 SHEET,RATING 723000B550 FILM,DECORATION 741WUA0021 SPRING,EARTH 713WPA0098 GUIDE,REMOCON 7260000306 SHEET,CAUTION 735WPA0565 BUTTON,ASS'Y 762WPA0009 HOLDER,CRT WIRE 8995034000 CORD CLIP UL CO. 800WB0A009 FIBER WASHER 8109I30A04 SCREW,TAP TITE(B) 3x10 8111J50D05 SCREW,TAPPING(A)

  • Page 31: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS DIODES R118 R00106223J RC 22K OHM 1/6W D519 D2WXB290S0 DIODE SILICON SB290S R402 R3X181102J R,METAL OXIDE OHM 1W D520 D1VT001330 DIODE,SILICON 1SS133T-77 ! R408 R4X5T6392F R,METAL 3.9K OHM 1/6W D521 D1VT001330 DIODE,SILICON...
  • Page 32 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION JACKS J701 060J431019 RCA JACK MSP-213V2-432 PBSN J702 0602431013 RCA JACK JPJ1187-010010 J705 063Q700002 JACK YKF51-5503 J707 060J411018 RCA JACK MSP-213V1-432 PBSN J801 066F130020 SOCKET,CATHODE RAY,TUBE ISHS53S SWITCHES SW101 0504201T31 SWITCH,TACT SKHVBED010 SW102 0504201T31...
  • Page 33 SPEC.NO. M3L5-19G O/R NO. A243512...

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