Memorex MT2274A Service Manual Download Page 17

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OSD

BLOCK DIAGRAM

RGB Proc.2
OSD SW
CONTRAST BRIGHTNESS

I/O
IIC

TIM

INT

PWM

MCU
CLK

VCXO

RGB OUTPUT Stage
DRIVE
CUT OFF
HV BLK

Ver.Proc.
Ver SYNC SEP
Ver.COUNT DOWN
V RAMP

Q801, Q804

RED AMP

Q803, Q805

GREEN AMP

Q802, Q806

BLUE AMP

Q402

H. DRIVE

Q401

H. OUTPUT

FB401

CRT
V801

Heater

PUMP UP

AMP

V-OUT IC
IC401 LA78041

VCC

RGB Proc.1
RGB MATRIX
COLOR CONT

ROM
RAM

Hor.Proc.
SYNC SEPA/Hor. VCO
Hor.COUNT DOWN
AFC-1/H COINCIDENT
AFC-2 H PHASE

Q507

FEED BACK

T501

FEED BACK

Q502

BUFFER

MEMORY IC
IC199 AT24C04N-10SU-2.7

POWER

VOL. DOWN

CH. DOWN

VOL. UP

CH. UP

X601
3.579545MHz

OS101

MICON/CHROMA IC
IC101 OEC7091C

Chroma Proc.
ACC/C-BPF
APC/KILLER
TINT/DEMO

IC501
PS2561AL1-1-V(W)

TU001

SOUND DECORDER IC
IC901 AN5829S

Q501

SWITCHING

D501~D504

RECTIFIER

AC IN

F501

RY501

RELAY

Q504

RELAY DRIVE

SDA SCL

J712

J711

Q607

H.CTL

J710

SOUND AMP IC
IC1001 AN17805A

J701

J705

E-1

E-2

SPEAKER
SP1001

24 26

Summary of Contents for MT2274A

Page 1: ...SERVICE MANUAL MT2274A Design and specifications are subject to change without notice COLOR TELEVISION RECEIVER ORIGINAL MFR S VERSION A ...

Page 2: ...t which is replaced should be used the part which has the same character Especially as to the important parts for safety which is indicated in the circuit diagram or the table of parts as a mark the designated parts must be used PUT PARTS AND WIRES IN THE ORIGINAL POSITION AFTER ASSEMBLING OR WIRING 4 There are parts which use the insulation material such as a tube or tape for safety or which are ...

Page 3: ...GENERAL SPECIFICATIONS DISASSEMBLY INSTRUCTIONS 1 REMOVAL OF ANODE CAP 2 REMOVAL AND INSTALLATION OF FLAT PACKAGE IC SERVICE MODE LIST CONFIRMATION OF HOURS USED WHEN REPLACING EEPROM MEMORY IC ELECTRICAL ADJUSTMENTS BLOCK DIAGRAM PRINTED CIRCUIT BOARDS MAIN CRT SCHEMATIC DIAGRAMS MICON CHROMA TUNER DEFLECTION CRT POWER SOUND AV WAVEFORMS MECHANICAL EXPLODED VIEW MECHANICAL REPLACEMENT PARTS LIST ...

Page 4: ...ower Consumption at AC 125 W at AC 120 V 60 Hz Stand by at AC 5 W at AC 120 V 60 Hz Per Year kWh Year Protector Power Fuse Yes Safety Circuit Yes IC Protector Micro Fuse No G 4 Regulation Safety UL Radiation FCC X Radiation DHHS G 5 Temperature Operation 5o C 40o C Storage 20o C 60o C G 6 Operating Humidity Less than 80 RH G 7 On Screen Menu Yes Display Menu Type Character Picture Yes Contrast Yes...

Page 5: ...n Format Orion Custom Code 86 05 h Power Source Voltage D C 3V UM size x pcs UM 4 x 2 pcs Total Keys 28 Keys Keys Power Yes 1 Yes 2 Yes 3 Yes 4 Yes 5 Yes 6 Yes 7 Yes 8 Yes 9 Yes 0 Yes 100 No CH Up Yes CH Down Yes Volume Up Yes Volume Down Yes TV Caption Text Yes CH1 CH2 Yes TV Video TV AV Yes CH RTN CH ENT Quick View Yes Sleep Yes RE Call Call Yes Reset Yes Menu Yes Enter Yes Mute Yes Exit No MTS ...

Page 6: ... Yes Rod Antenna No Poles Terminal Loop Antenna No Terminal U V Mixer No DC Car Cord Center No Guarantee Card Yes Warning Sheet No Circuit Diagram No Antenna Change Plug No Service Facility List No Important Safeguard No Dew AHC Caution Sheet No AC Plug Adapter No Quick Set up Sheet No Battery No UM size x pcs OEM Brand No AC Cord No AV Cord 2Pin 1Pin No Registration Card No Information Sheet No P...

Page 7: ...G 15 Weight Net Approx 36 5kg 80 5 lbs Gross Approx 40 5Kg 89 3 lbs G 16 Carton Master Carton No Content Sets Material Dimensions W x D x H mm x x Description of Origin No Gift Box Material Double Brown Corrugate Carton Dimensions W x D x H mm 731 x 580 x 665 Design As per Buyer s Description of Origin Yes Drop Test Natural Dropping At 1 Corner 3 Edges 6 Surfaces Height cm 31 Container Stuffing 19...

Page 8: ...ip up the sides of the Rubber Cap in the direction of the arrow and remove one side of the support Refer to Fig 1 2 2 GND on the CRT Screwdriver Alligator Clip Support CRT GND on the CRT Rubber Cap CRT Support Fig 1 2 3 After one side is removed pull in the opposite direction to remove the other NOTE Take care not to damage the Rubber Cap INSTALLATION 1 Clean the spot where the cap was located wit...

Page 9: ... the IC leads using a blower type IC desoldering machine Refer to Fig 2 2 2 Fig 2 2 NOTE Do not rotate or move the IC back and forth until IC can move back and forth easily after desoldering the leads completely When IC starts moving back and forth easily after desoldering completely pickup the corner of the IC using a tweezers and remove the IC by moving with the IC desoldering machine Refer to F...

Page 10: ...2 8 Thin tip Soldering Iron NOTE When the IC leads are bent during soldering and or repairing do not repair the bending of leads If the bending of leads are repaired the pattern may be damaged So be always sure to replace the IC in this case Finally confirm the soldering status on four sides of the IC using a magnifying glass Confirm that no abnormality is found on the soldering position and insta...

Page 11: ...otal hours 16 x 16 x 16 x thousands digit value 16 x 16 x hundreds digit value 16 x tens digit value ones digit value ADDRESS DATA INIT 00 10 CRT ON 0010 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 1 2 3 4 5 6 7 8 9 1...

Page 12: ...signal Using the remote control set the brightness and contrast to normal position Activate the adjustment mode display of Fig 1 1 and press the channel button 01 on the remote control to select CUT OFF Adjust the Screen Volume until a dim raster is obtained FUNCTION OSD H CUT OFF H VCO H PHASE V SIZE V SHIFT R DRIVE B DRIVE R BIAS G BIAS B BIAS BRIGHT CENT BRIGHT MAX BRIGHT MIN NO 00 01 04 05 06 ...

Page 13: ...ntrol to select H PHASE Press the VOL UP DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on right and left becomes minimum 2 6 VERTICAL SIZE 1 2 3 4 Receive the monoscope pattern Using the remote control set the brightness and contrast to normal position Activate the adjustment mode display of Fig 1 1 and press the channel button 06 on the remote control to select V SIZ...

Page 14: ...V mode Then perform the above adjustments 2 6 Fig 2 3 120 white 100 2 15 TINT 1 2 3 4 5 6 7 Receive the color bar pattern RF Input Using the remote control set the brightness contrast color and tint to normal position Connect the oscilloscope to TP024 Activate the adjustment mode display of Fig 1 1 and press the channel button 22 on the remote control to select TINT Press the VOL UP DOWN button on...

Page 15: ...ten the screw for the magnet Refer to the adjusted CRT for the position Refer to Fig 3 1 If the deflection yoke and magnet are in one body untighten the screw for the body Receive the green raster pattern from the color bar generator Slide the deflection yoke until it touches the funnel side of the CRT Adjust center of screen to green with red and blue on the sides using the pair of purity magnets...

Page 16: ...404 SPEAKER CD1001 CP1001 DEGAUSS COIL CP502 C R T CD802 VR502 VR401 S501A FB401 CP803A VR403 J701 J705 W130 CP601 S501B TP401 TU001 CP802A J712 J711 J710 CD501 CD803 C D 8 0 1 C P 4 0 1 C R T ELECTRICAL ADJUSTMENTS 4 ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE WIRING CONNECTION D 5 ...

Page 17: ...NC SEPA Hor VCO Hor COUNT DOWN AFC 1 H COINCIDENT AFC 2 H PHASE 1 DY Q507 FEED BACK T501 3 8 15 FEED BACK SW Q502 BUFFER 5 MEMORY IC IC199 AT24C04N 10SU 2 7 POWER VOL DOWN CH DOWN VOL UP CH UP X601 3 579545MHz OS101 1 13 MICON CHROMA IC IC101 OEC7091C Chroma Proc ACC C BPF APC KILLER TINT DEMO IC501 PS2561AL1 1 V W TU001 13 12 11 10 17 66 SOUND DECORDER IC IC901 AN5829S Q501 SWITCHING D501 D504 RE...

Page 18: ...W062 W088 W087 W029 W027 W011 C002_1 W026 W056 R515 W083 W064 W039 Q401 D803 TP023 TP024 TP022 CP801 R804 R802 D801 D802 Q803 Q801 Q802 J801 CP806_1 R806 R807 R803 R805 C802 W115 W003 D001 C004 W014 W030 W095 D606 W809 W036 W042 W044 W114 W057 D511 R516 W839 W105 D406 D417 C633 R817 W047 C1013_1 C1014_1 W075 C1016 W058 W071 R127 W054 W053 W055 W834 R1010 W829 W851 R132 W019 R124 W024 C520_1 C440 C...

Page 19: ...2 C108 C107 C105 C104 C101 C102 I C 1 0 1 R734 C716 C715 C917_1 C914_1 IC901 C912 C918_1 C916_1 C908 R903 R115 R123 R004 R003 C001 C811 C810 C809 R801 R810 R808 R813 R811 R816 R814 R815 C1004 R319 C1007 R131 R129 R1017 C813 Q901 C612 C615 C653 C512_1 C727 Q902 Q407 Q507 C106 C605 C911 R006 R818 R809 R812 R104 R602 C602 C620 IC199_1 C913 R733 R135 C641 C642 C640 Q1003 W881 R1019 PRINTED CIRCUIT BOA...

Page 20: ...4 15 16 17 18 19 2 20 21 3 4 5 6 7 8 9 TM101 RC DW130 GND B Vout OS101 KSM 713SY 1 2 3 Y_IN P CON 5V P CON 5V H_OUT H_CTL ABCL H_CTL G OUT R OUT H_SYNC B OUT CLAMP PROTECT DEGAUSS_H V_OUT GND V_FEEDBACK AT 5V ABCL H_OUT P CON 8V B X RAY SDA R OUT G OUT SCL UNREG 12V B OUT H_SYNC VOLUME ON_TIMER AFT POWER_FAIL KEY1 V_OUT UNREG 12V B KEY2 V_FEEDBACK DEGAUSS_H GND POWER_ON REMOCON C_IN MONO_R_V_IN VI...

Page 21: ...4 330 1 4W R427 100 1 4W R443 3 9K 1 4W R445 18K 1 4W R441 18K1 4W R438 10K 1 4W R458 1 5K 1 2W R419 820 1 4W R430 5 6K 1 4W R412 2701 2W R446 470 1 2W R444 22K 1 4W R431 47K 1 4W R440 220K1 4W R411 1K 1 2W R415 560 1 2W R410 560 1 2W R420 6 8K 1 4W R455 2 7K 1 4W R454 1 5K 1 2W R459 820 1 2W R816 270 R815 270 R437 2 7K R802 2 7K 1 4W R806 2 7K 1 4W R801 220 R808 220 R810 220 R814 2 7K R811 2 7K R...

Page 22: ... 1 4W R504 10K 1 2W R507 150 1 4W R514 6 8K 1 4W R533 1K R555 100K 1 4W R554 15K 1 4W R515 10K 1 4W R520 1 5M 1 2W R516 5 6K 1 4W R511 1 2M 1 2W R503 1 2M 1 2W R508 100 1 4W R505 10K R532 820 R547 1 5K 1 4W R513 2 2K 1 2W R534 100 R543 330 1 2W D520 1N4937 B EIC D521 1SS133 D508 1SS133 D518 1SS133 D502 RM11C EIC D501 RM11C EIC D504 RM11C EIC D503 RM11C EIC D514 1SS133 D505 30DF6 FC D516 1SS133 D51...

Page 23: ... DIAGRAM IS THE LATEST AT THE TIME DANS LA NOMENCLATURE DES PIECES N UTILISER QUE CELLS DECRITES DANGEREUSES AN POINT DE VUE SECURITE LES PIECES REPAREES PAR UN ETANT ATTENTION SINCE THESE PARTS MARKED BY CAUTION DESCRIBED IN PARTS LIST ONLY CRITICAL FOR SAFETY USE ONES ARE W866 W829 W881 W894 W867 W852 W834 AUDIO SIGNAL SCL SDA AUDIO_MUTE VOLUME GND REAR_AUDIO_R REAR_AUDIO_L FRONT_AUDIO_R FRONT_A...

Page 24: ...WAS MEASURED C734_1 0 001 500V W108 B C724_1 0 0033 B C723_1 0 0033 B C716 0 0033 B C715 0 0033 B C727 0 1 B C729_2 10 25V KA C704 10 25V KA C703_1 10 25V KA C701_1 10 25V KA C702_1 10 25V KA R708 75 R707 1 2K R734 1K R740 75 R722 75 R723 75 R733 1K R711 1K R709 1K R724 220 1 4W OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE NOTE THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME W875 W876 W877 C7...

Page 25: ...µs div 200mV 20µs div 8 1V 20µs div 7 DEFLECTION CRT 14 0 5V 5ms div 15 20V 20µs div 16 2V 20µs div 50V 20µs div 20 10V 5ms div 19 200V 20µs div 17 10V 5ms div 18 21 50V 20µs div H 1 NOTE The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram ...

Page 26: ...forms were measured at the point of the corresponding balloon number in the schematic diagram 22 50V 20µs div SOUND 25 0 5V 1ms div 26 200mV 1ms div 200mV 1ms div 27 31 200mV 1ms div 0 5V 1ms div 32 0 5V 1ms div 33 28 200mV 1ms div H 2 ...

Page 27: ... 101A 205 101C 101 101B 205 205 205 101D 101E SP1001 204 TU001 203 107 208 104 103 201 201 FB401 202 208 105 207 207 207 207 109 109 109 109 V801 J801 PCB110 CRT PCB ASS Y 111 111 108 108 106 102A 102C 102C 206 206 102B 102 206 206 206 206 205 206 110 ...

Page 28: ... ANODE WIRE 108 800WR0A003 SHEET CRT SUPPORT 109 762WPA0009 HOLDER CRT WIRE 110 726000A077 SHEET CRT SERVICEMAN 111 769WSAA008 WASHER CRT T 0 5 201 810763080U SCREW TAP TITE S BRAZIER 3x8 202 8109I30A0U SCREW TAP TITE B WH7 3x10 203 810963080Q SCREW TAP TITE B BRAZIER 3x8 204 811063080U SCREW TAP TITE P BRAZIER 3x8 205 8110630A0U SCREW TAP TITE P BRAZIER 3x10 206 8117540B0U SCREW TAP TITE B0 TRUSS...

Page 29: ...DUU024990 TRANSISTOR SILICON 2SD2499 LB0EC1 C452 P4G8FJ153H CMPP 0 015 UF 1 25KV PHE Q402 TCAT03227Y TRANSISTOR SILICON KTC3227_Y AT C453 P4N8FJ562H CMPP 0 0056UF 1 25KV Q407 T8RA030520 TRANSISTOR SILICON 2SC3052 T1 C501 E02LF4102M CE 1000 UF 35V Q408 TAATA12660 TRANSISTOR SILICON KTA1266 AT Y GR C505 P2122B334M CMP 0 33 UF 275V ECQUL Q409 TC30041590 TRANSISTOR SILICON 2SC4159 D E C506 P2122B104M ...

Page 30: ...CTOR A1561WV2 A6P CP502 069S420099 CONNECTOR PCB SIDE A1561WV2 2PK CP601 069S270639 CONNECTOR PCB SIDE A2001WR2 7P CP801 069S320010 CONNECTOR PCB SIDE A2361WV2 2P CP1001 069S140419 CONNECTOR PCB SIDE A2502WV2 4P CP802A 067U005049 WIRE HOLDER B2013H02 5P CP802B 067U005049 WIRE HOLDER B2013H02 5P CP803A 067U004029 WIRE HOLDER B2013H02 4P CP803B 067U004029 WIRE HOLDER B2013H02 4P EL001 124116281A EYE...

Page 31: ...M3T1 09D O R NO SPEC NO W523015 ...

Page 32: ...SERVICE MANUAL MT2274A Please file the revision with the original version COLOR TELEVISION RECEIVER REVISION 1 MFR S VERSION B MFR S VERSION A B PRODUCT IMPROVEMENT SH COMPLIANT ...

Page 33: ...010 A3T109D010 MAIN PCB ASS Y VERSION A TMD605D A3T118D010 MAIN PCB ASS Y VERSION B CME045A PCB110 A3T109D110 CRT PCB ASS Y VERSION A TCD461D A3T117D110 CRT PCB ASS Y VERSION B CCE038A MAIN PCB s and CRT PCB s are not interchangeable M3T1 13D W583087 O R NO ELECTRICAL REPLACEMENT PARTS LIST MFR S VERSION A MFR S VERSION B SPEC NO REF NO ...

Page 34: ...E MANUAL MT2274A Please file the revision with the original version COLOR TELEVISION RECEIVER REVISION 2 MFR S VERSION C MFR S VERSION A PRODUCT IMPROVEMENT B SH COMPLIANT C CRT A68KTB359X058 PL M68LWF088X50 ...

Page 35: ...0V CH FB401 043227024Y TRANSFORMER FLYBACK BSC27 N2239 043227020Y TRANSFORMER FLYBACK 3227020Y OS101 077Q000025 REMOTE RECEIVER KSM 713SY 077Q037007 REMOTE RECEIVER PIC 37143SY H PCB010 A3T118D010 MAIN PCB ASS Y VERSION B CME045A A3T1132010 MAIN PCB ASS Y VERSION C CME045A R819 R002T2101J RC 100 OHM 1 2W C812 C0JTB0512K CC 100 PF 500V B DEL PCB110 A3T117D110 CRT PCB ASS Y VERSION B CCE038A A3T1132...

Page 36: ...ADD C450 R819 ADD C643 MAIN PCB MFR S VERSION C DEFLECTION CRT SCHEMATIC DIAGRAM MAIN PCB MFR S VERSION C MICON CHROMA TUNER SCHEMATIC DIAGRAM SPEC NO O R NO M3T1 132 W5Z3067 ...

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