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Memorex MT1132 Service Manual

13"color television
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Service Manual

MT1132
13" Color Television
THIS SERVICE MANUAL IS FOR MT1132 SUFFIX A , B ,
C AND D CRT USAGE
SUFFIX A
V451
5721-014ST37N
(37GDA86X)
DY501
4993-117
SUFFIX B
SUFFIX C
5721-37CN030T
5721-026TT37N
(370KSB22(SYB))
(A34JFQ90X)
4993-052
4993-110
SUFFIX D
5721-030ZT37N
(A34JXV70X)
4993-124

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Summary of Contents for Memorex MT1132

  • Page 1: Service Manual

    Service Manual MT1132 13” Color Television THIS SERVICE MANUAL IS FOR MT1132 SUFFIX A , B , C AND D CRT USAGE SUFFIX A SUFFIX B SUFFIX C SUFFIX D V451 5721-014ST37N 5721-37CN030T 5721-026TT37N 5721-030ZT37N (37GDA86X) (370KSB22(SYB)) (A34JFQ90X) (A34JXV70X) DY501...

  • 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 PROTECT YOUR CUSTOMER 1. Inspect all lead dress to make certain that leads are not involves a shock hazard. Work on these models should only be performed by those who are thoroughly familiar with pinched or that hardware is not lodged between the chassis and precautions necessary when working on high voltage...

  • 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 V I D E O - 4 -...
  • Page 6 IC, TRANSISTOR AND CRT COMPLEMENT INTEGRATED CIRCUITS IC101 TA87C-B2 Microcomputer IC601 STR30130 IC102 M24CO2B EEPROM IC671 NJ7805LD Voltage Regulator and Reset IC301 TA1268N IF/Video/Chroma/Deflection IC701 TLP651 Photo-Interrupter IC311 NJ7809FA Voltage Regulator IC702 TLP631 Photo-Interrupter IC501 AN5512 Vertical Deflection Output TRANSISTORS Q101 DTC143ZS Vertical Synchronizing Q551 2SC1473A(R)

  • 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. 2. Connect positive lead of DC Digital Voltmeter to TP7 and negative lead to TP4. 3.
  • 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

    FIG. 5 FOCUS ADJUSTMENT Adjust focus control, located on the Horizontal Output Transformer (T671), for maximum overall definition and fine picture detail with Brightness and Contrast controls set at normal viewing levels. BLACK AND WHITE ADJUSTMENT ( CUTOFF / WHITE BALANCE ) The purpose of this procedure is to adjust the bias applied to the color picture tube for reproducing a quality monochrome picture at all brightness levels and also to achieve maximum usable brightness.

  • Page 11: Rf Agc Adjustment

    VERTICAL PHASE ADJUSTMENT Connect TV Test pattern Generator (NTSC signal 70dB u, Monoscope Pattern) to EXT. Antenna Terminal (TE1) through TV Channel Generator. ( NOTE: For steps 2, 3 and 4 below, refer to page 3 for Adjustment By Remote Control Method). 2.
  • Page 12 VIDEO IN ADJUSTMENT Connect Pattern Generator (1Vp-p, Color Bar Pattern) to video jack (J701). Connect positive lead of Oscilloscope probe 1 to R703 and negative lead of Oscilloscope to TP4 to detect video in signal. Connect positive lead of Oscilloscope probe 2 to TP10 and negative lead of Oscilloscope to TP4. Select Video Mode by remote control.

  • Page 13: Test Point

    TEST POINT TP 2(-) PCB 1 T671 TU 1 C609 IC301 D552 VR701 T203 TP10 TP 9 TP11 T202 PCB 2 TP 7 TP15 VR702 R453 (GND) TP8 VIDEO SU401 TP16 R452 IC101 R451 TP14 TP13 - 12 -...
  • Page 14 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 15 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) - 14 -...

  • Page 16: Wiring Diagram

    WIRING DIAGRAM - 15 -...

  • Page 17: Schematic Diagram

    SCHEMATIC DIAGRAM - 16 -...
  • Page 18 P.C. BOARDS PCB-1 NOTE MAIN P.C. BOARD X X X X MT1132/MT1133 X X X X MT1192 PCB-2 CRT SOCKET P.C. BOARD - 17 -...

  • Page 19: Exploded View

    EXPLODED VIEW - 18 -...

  • Page 20: General Unit Parts List

    Ref No. Part No. Description Ref No. Part No. Description GENERAL UNIT PARTS LIST PCB-1 MAIN P.C.BOARD 1662-78503 Push Button 5345-475-50 4.7 uF +-20% 50V Electrolytic 1532-25301 Window 5345-337-16 330 uF +-20% 16V Electrolytic 2240-742 Holder;CORD BUSHING 5345-226-50 22 uF +-20% 50V Electrolytic 2133-318 Protector;BUTTON C101...
  • Page 21 Ref No. Part No. Description Ref No. Part No. Description CAPACITORS CAPACITORS C341 5345-104-50 0.1 uF +-20% 50V Electrolytic C673 5359-3321959 3300 pF +-10% 400V Polypropylene C342 5345-104-50 0.1 uF +-20% 50V Electrolytic C674 5345-106-250 10 uF +-20% 250V Electrolytic C343 5345-104-50 0.1 uF +-20% 50V Electrolytic...
  • Page 22 Ref No. Part No. Description Ref No. Part No. Description RESISTORS RESISTORS R121 5134-562J25P 5.6 k ohm +-5% 1/4W Carbon R334 5135-124J50P 120 k ohm +-5% 1/2W Carbon R122 5134-562J25P 5.6 k ohm +-5% 1/4W Carbon R335 5232-683J16P 68 k ohm +-5% 1/6W Carbon R123 5134-562J25P 5.6 k ohm +-5% 1/4W Carbon...

  • Page 23: Integrated Circuits

    Ref No. Part No. Description Ref No. Part No. Description RESISTORS TRANSISTORS R617 5275-S080K152 1.5 k ohm +-10% 5W Cement Q101 5613-C143ZS Transistor, DTC143ZS R671 5102-S101J2R2 2.2 ohm +-5% 1/4W Fuse Q102 5613-2785(F) Transistor, 2SC2785(F) R673 5102-S101J2R2 2.2 ohm +-5% 1/4W Fuse Q173 5613-2785(F) Transistor, 2SC2785(F)
  • Page 24 Ref No. Part No. Description Ref No. Part No. Description DIODES COILS AND TRANSFORMERS 5635-HZT33 Zener, HZT33 33V 400 mW L101 5995-470098 Coil 47 uH 5635-RD5R1EB2 Zener, RD5.1EB2 5.1V L203 5995-220098 Coil 22 uH D301 5636-1N4148M Diode L301 5995-150098 Coil 15 uH D302 5636-1N4148M Diode...
  • Page 25 Ref No. Part No. Description Ref No. Part No. Description MISCELLANEOUS TH601 5192-01801 Posistor 6119-15502 VHF/UHF/CATV Tuner Assembly X101 5691-S2401802 Crystal Osc.8.0MHz;(8.0MHz) X301 5691-S2401362 Crystal Osc. 3.579545MHz;(3.57945MHz) X551 5693-SB503F30 Ceramic Osc. 503 kHz;(503kHz) PCB-2 CRT SOCKET P.C.BOARD(D551-13T102B) CAPACITORS TRANSISTORS C451 5361-471KB 470 pF +-10% 50V Ceramic B Q451...

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