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Memorex MT1191V Service Manual

19" color television
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Service Manual

MT1191V
19" Color Television
THIS SERVICE MANUAL IS FOR MT1191V SUFFIX A , B ,
C, D AND E CRT USAGE
SUFFIX A
V451
5721-015ST51N
(51GGD95X)
DY501
4993-118
SUFFIX B
SUFFIX C
5721-51CN020T
5721-028TT48N
(510UEB22DY)
(A48LRH93X (W))
4993-060
4993-122
SUFFIX D
SUFFIX E
5721-029NT48N
5721-031ZT48N
(A48LSD095X)
(A48LGS30X)
4993-119
4993-123

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Summary of Contents for Memorex MT1191V

  • Page 1: Service Manual

    Service Manual MT1191V 19” Color Television THIS SERVICE MANUAL IS FOR MT1191V SUFFIX A , B , C, D AND E CRT USAGE SUFFIX A SUFFIX B SUFFIX C SUFFIX D SUFFIX E V451 5721-015ST51N 5721-51CN020T 5721-028TT48N 5721-029NT48N 5721-031ZT48N (51GGD95X)

  • Page 2: Specifications

    FEATURES On-screen graphics guide you through setup features and operations Automatic programming of channels allows easy selection of stations available in your viewing area Sleep timer programs the TV to turn itself off at a preset time One day timer programs the TV to come on once at a preset time Weekly timer programs the TV to come on at a preset time every day 26 button infrared remote control allows remote operation VHF/UHF/CATV tuning allows reception of standard broadcasts or cable TV channels...

  • Page 3: Important Service Safety Information

    IMPORTANT SERVICE SAFETY INFORMATION Operation of receiver outside of cabinet or with back removed involves PROTECT YOUR CUSTOMER a shock hazard. Work on these models should only be performed by 1. Inspect all lead dress to make certain that leads are not pinched those who are thoroughly familiar with precautions necessary when or that hardware is not lodged between the chassis and other working on high voltage equipment.

  • Page 4: Adjustment Mode

    ( ADJUSTMENT BY REMOTE CONTROL ) ADJUSTMENT MODE The following adjustment items can be performed from menus by Remote Control as shown below : NOTE: The button combination and position on the Remote Control to select the adjustment items is given on page 4. 1.

  • Page 5: Remote Control Layout

    REMOTE CONTROL LAYOUT VIDEO V I D E O - 4 -...

  • Page 6: Crt Removal

    IC, TRANSISTOR AND CRT COMPLEMENT INTEGRATED CIRCUITS IC101 TA87C-B2 Microcomputer IC102 M24CO2B EEPROM IC301 TA1268N IF/Video/Chroma/Deflection IC311 NJ7809FA Voltage Regulator IC501 AN5512 Vertical Deflection Output IC601 STR30130 IC671 NJ7805LD Voltage Regulator and Reset TRANSISTORS Q101 DTC143ZS Vertical Synchronizing Q102 2SC945(P) Horizontal Synchronizing Q173 2SC945(P) SD Signal Buffer...

  • Page 7: Sub Tint Adjustment

    INSTALLATION AND SERVICE INSTRUCTION CAUTION: Use an isolation transformer when performing any service on this chassis. SHUTDOWN CIRCUIT: When the high voltage rises, there are simultaneous voltage increase developed at terminal 6 of the Horizontal Output Transformer ( T671 ) and applied to pin 29 of IC301. If excessive high voltage is produced, the increased voltage developed exceeds the rating of zener diode D552 causing the Horizontal Oscillator to stop functioning and the high voltage system to shut down.

  • Page 8: Color Purity Adjustment

    SOUND IF ADJUSTMENT Connect TV Test Pattern Generator (NTSC signal, 70dB u, channel 2) to EXT. Antenna Terminal (TE1) through TV Channel Signal Generator. (Standard modulation is 400Hz at 25kHz deviation for sound signal. Connect positive lead of DC Digital Voltmeter to TP7 and negative lead to TP4. Adjust T203 so that the DC Digital Voltmeter reading is 4.0V.
  • Page 9 STATIC CONVERGENCE ADJUSTMENT ( Refer to Figure 3 and 4 ) IMPORTANT: Before proceeding, make sure the location of the convergence magnet assembly on the neck of the CRT is as shown in Figure 3. The rear edge of this assembly must be positioned 65 mm from the tip of the CRT base.

  • Page 10: Focus Adjustment

    GREEN GREEN WEDGE B BLUE BLUE GREEN BLUE WEDGE C GREEN BLUE WEDGE A BLUE GREEN WEDGE A DEFLECTION YOKE REAR VIEW DEFLECTION YOKE REAR VIEW BLUE GREEN GREEN GREEN WEDGE B WEDGE B BLUE BLUE BLUE GREEN WEDGE C BLUE GREEN GREEN...
  • Page 11 HORIZONTAL PHASE ADJUSTMENT Connect TV Test pattern Generator (NTSC signal 70dB u, Monoscope Pattern) to Antenna T erminal (TE) through TV Channel Generator. (NOTE: For steps 2, 3 and 4 below, refer to page 3 for Adjustment By Remote Control Method). Go to Adjustment Mode (2) by remote control.

  • Page 12: Test Point

    TEST POINT - 11 -...
  • Page 13 VOLTAGE CHART ( all in volts ) OPERATION CONDITION : TINT, BRIGHT and COLOR CONTROL……….. CENTER CONTRAST ………………………………………. MAXIMUM COLOR BAR SIGNAL IC101 TERMINAL No Volt TERMINAL No Volt TERMINAL No Volt TERMINAL No Volt TERMINAL No Volt IC102 TERMINAL No Volt IC301 TERMINAL No...
  • Page 14 CHASSIS WAVEFORM WF-1 1.0Vp-p(H) WF-2 9.7Vp-p(H) WF-3 47.2Vp-p(V) WF-4 1.7Vp-p(V) WF-5 27.4Vp-p(H) WF-6 24.4Vp-p(H) WF-8 202Vp-p(H) WF-9 0.75Vp-p(H) WF-7 25.8Vp-p(V) - 13 -...

  • Page 15: Wiring Diagram

    WIRING DIAGRAM - 14 -...
  • Page 16 SCHEMATIC DIAGRAM PCB1 MAIN 4551-2011601D PCB2 CRT TP16 R142 1/4W VOUT R456 RX101 3.3k 1/2W REMOTE SU451 C180 SENSOR R454 R455 V451 100p B TP13 3.3k 1/2W 3.3k 1/2W TP15 TP14 Q451 Q452 Q453 R146 1 k R128 1573A (R) 1573A (R) 1573A (R) 2.2k...
  • Page 17 P.C. BOARDS PCB-1 MAIN P.C. BOARD PCB-2 CRT SOCKET P.C. BOARD...

  • Page 18: Exploded View

    EXPLODED VIEW - 16 -...

  • Page 19: General Unit Parts List

    Ref No. Part No. Description Ref No. Part No. Description GENERAL UNIT PARTS LIST MISCELLANEOUS 1532-24801 Window;SENSOR 4291-034 Magnet Assembly 1662-78101 Push Button 4291-031 Magnet Assembly SUFFIX C 2132-412 Wedge Deflection Yoke;SPACER(x3) 4291-031 Magnet Assembly SUFFIX E 2133-314 Protector;BUTTON 4105-01102 CRT Wire;(CRT GND) 2222-379 Heat Sink;CA...
  • Page 20 Ref No. Part No. Description Ref No. Part No. Description CAPACITORS CAPACITORS C315 5342-S06FM225 2.2 uF +-20% 50V Electrolytic NP C604 5361-S40FM103 0.01 uF +-20% 250V Cetamic F C317 V5369-S04FZ103 0.01 uF +80%-20% 25V Semiconductor C605 5361-S40FM103 0.01 uF +-20% 250V Cetamic F C318 5345-476-16 47 uF +-20% 16V Electrolytic...
  • Page 21 Ref No. Part No. Description Ref No. Part No. Description RESISTORS RESISTORS R124 5134-562J25P 5.6 k ohm +-5% 1/4W Carbon R335 5232-124J16P 120 k ohm +-5% 1/6W Carbon R126 V5133-R010J223 22 k ohm +-5% 1/8W Carbon R336 V5133-R010J222 2.2 k ohm +-5% 1/8W Carbon R127 5134-274J25P 270 k ohm +-5% 1/4W Carbon...

  • Page 22: Integrated Circuits

    Ref No. Part No. Description Ref No. Part No. Description RESISTORS INTEGRATED CIRCUITS R603 5277-271591 270 ohm 15W Cement IC101 5654-TA87C-B2 IC;(u-COM) R604 5171-S071J123 12 k ohm +-5% 1W Metal IC102 5654-M24C02B IC;(EEPROM) R605 5134-334J25P 330 k ohm +-5% 1/4W Carbon IC301 5653-TA1268N IC, TA1268N ;(IF/VIDEO/CHROMA/DEF)
  • Page 23 Ref No. Part No. Description Ref No. Part No. Description COILS AND TRANSFORMERS PCB-2 CRT SOCKET P.C.BOARD(D551-19V1114B) CAPACITORS L552 5995-540084 Coil;(LINEARITY) L602 5583-52301 Coil AF CH;(LINE FILTER) T202 5932-12502 Coil;(AFT) C451 5361-681KB 680 pF +-10% 50V Ceramic B T203 5562-0019 Transformer SIF Det.;(SIF DET) C452 5361-561KB...

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