Memorex MT2271S Page 24 Service Manual Download

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Q902

2SA733(C)

-T(P,Q)

BUFFER

Q901

2SA733(C)-T(P,Q)

BUFFER

CP1001

A2502WV2-4P

IC901

AN5829S

SOUND DECORDER IC

SPEAKER

SP1001
S0509F12

8OHM 2.5Wx2

IC1001

LA4600

SOUND AMP IC

IC302

M62420SP

TONE CONTROL IC

HS1001

763WAA0131

B1002

W5RH3.5X5X1.0

Q1001

KTC3198

MUTE SW.

AUDIO SIGNAL

THE DC VOLTAGE AT EACH PART WAS MEASURED

WITH THE DIGITAL TESTER WHEN THE COLOR BROADCAST

WAS RECEIVED IN GOOD CONDITION AND PICTURE IS NORMAL.

NOTE:

C1009

6.3V

C1006

4.7

50V

C911

0.33

50V

C903

4.7

50V

C904

4.7

50V

C915

3.3

50V

C905

4.7

50V

C907

16V

C328

16V

C331

16V

C910

16V

C1005_1

100

10V

C1010

1 TF

C332_1

0.001

C315

0.022
B

C316

0.47
TF

C1001

0.1

C1003

0.1

C914

0.1

C918

0.1

C912

0.047

C916

0.1

C917

0.1

C323

0.47 TF

C322

0.033

C324

0.022 B

C908

0.001

C913

0.022

C303

0.033 B

C1002_1

0.01

C1004_1

0.01

C329

2.2

50V

C301_1

470

10V

C1007

1000

16V

C1008

1000

16V

C325

2.2

50V

C317

2.2

50V

C330

2.2

50V

R306

4.7K

R1010

560

R1001

120K

R1006

2.7K

R1008

2.7K

R1004

1K 1/4W

R1009

1K 1/4W

R1002

4.7K

R902

2.2K

R901

2.2K

R903

220K

R904

4.7M

R310

100K

R308

R307

4.7K

R1011

1.8K

R312

R311

1.8K

R1014

15K

R1015

15K

R309

1.8K

OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE

NOTE: THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME

DANS LA NOMENCLATURE DES PIECES

N’UTILISER QUE CELLS DECRITES

DANGEREUSES AN POINT DE VUE SECURITE

ETANT

LES PIECES REPAREES PAR UN

ATTENTION:

DESCRIBED IN PARTS LIST ONLY

CRITICAL FOR SAFETY,USE ONES

ARE

SINCE THESE PARTS MARKED BY

CAUTION:

W828

W839

W805

W842

W841

W864

W863

W868

W869

SCL

SDA

AUDIO_MUTE

SCL

SDA

P.CON+9V

REAR_AUDIO_R

REAR_AUDIO_L

FRONT_AUDIO_R

FRONT_AUDIO_L

AUDIO_OUT_R

SOUND_L

SOUND_R

AUDIO_OUT_L

GND

SOUND+B

GND

SOUND_GND

TU_AUDIO_OUT

GND

AUDIO_OUT_L

AUDIO_OUT_R

G-9

G-10

FROM/TO CHROMA

FROM COMB/FILTER

FROM/TO CHROMA

FROM POWER

PCB010

TMA529

FROM/TO MICON/TUNER

SOUND SCHEMATIC DIAGRAM

(MAIN PCB)

INPUT GND

RIPPLE
FILTER

ATT.

STAND-BY

P.P

12.1

6.0

8.9

0.9

1.4

SP OUT L-

SP OUT L+

SP OUT R+

SP OUT R-

SPEAKER

OUTPUT GND

VCC

8.1

2.9

2.3

3.2

2.3

Noise

Det

Spectral

RMS Det

SAP

Filter

Noise

Filter

Spectral

Filter

SAP

Det

Stereo

Filter

GND

Input

VCA

Pilot

Det

St.PLL

Cancel

Pilot

Vcc

Spectral

Expand

dbx De-Emph

SAP

Demod

Wide Band

RMS Det

Wide Band

Filter

L+R Filter

L+R Demod

IIC Decoder

L-R Demod

L-R Filter

fH.2fH Trap Filter

OUT SW

AGC

Matrix

Offset

Cancel

Offset

Cancel

Wide Band

Expand

ZAP

DAC

(L-R)/SAP

Switch

De-Emph

75us

SAPout

Filter

2.3

0.4

5.1

2.4

0.4

2.3

3.4

3.7

2.6

3.6

3.7

5.0

2.3

2.2

4.4

INTERFACE

I2C BUS

CONTROL

LOGIC

136K

SIMAMP1

VOLAMP1

SIMAMP2

VOLAMP2

6.5K

VR4

1.8K

VR3

VR5

6.5K

TONE
AMP2

AMP1

TONE

VR6

4.2

4.4

3.4

3.3

4.4

5.0

4.2

4.4

3.4

3.3

3.7

3.8

5.0

REF

VR2

VR1

8.9

4.2

4.4

FROM/TO JACK/SOUND

Summary of Contents for MT2271S

Page 1: ...SERVICE MANUAL COLOR TELEVISION RECEIVER ORIGINAL MFR S VERSION A MT2271S Design and specifications are subject to change without notice ...

Page 2: ...ile the electric current is flowing 3 USE THE DESIGNATED PARTS The parts in this equipment have the specific characters of incombustibility and withstand voltage for safety Therefore the part 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 ...

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

Page 4: ...C 120V AC 60Hz DC Power Consumption at AC 115 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 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 then 80 RH G 7 On Screen Menu Yes Display Menu Type Character Picture Yes Contrast Yes Brightness Yes Color Yes T...

Page 5: ... 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 Audio Select Yes Set Yes Set Yes Multi Brand Keys CH Up VCR No CH Down VCR No Pause Still No TV VCR VCR No Code No CH E...

Page 6: ...M Brand No AC Cord No AV Cord 2Pin 1Pin No Registration Card No PTB Sheet No 300 ohm to 75 ohm Antenna Adapter No G 13 Interface Switch Front Power Yes System Select No Main Power SW No Sub Power No Channel Up Reset Yes Channel Down Enter Yes Volume Up Set Up Yes Volume Down Set Down Yes Menu Vol Up Vol Down Yes Rear AC DC No TV CATV Selector No Degauss No Main Power SW No Indicator Power No Stand...

Page 7: ...igin No Gift Box Yes Material Double Brown Dimensions W x D x H mm 718 x 558 x 655 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 198 Sets 40 container G 17 Cabinet Material Cabinet Front PS 94V0 DECABROM Cabinet Rear PS 94V0 A3 4 ...

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: ... a blower type IC desoldering machine Refer to Fig 2 2 2 Fig 2 2 NOTE Do not add the rotating and the back and forth directions force on the IC until IC can move back and forth easily after desoldering the IC 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 mach...

Page 10: ...hin 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 installati...

Page 11: ... After the confirmation of using hours turn off the power INIT 00 83 0010 CRTON ADDRESS DATA FIG 1 Initial setting content of MEMORY IC POWER ON total 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 WHEN REPLACING EEPROM MEMORY IC If a service repair is undertaken where it has been required to change the MEMORY IC the following steps...

Page 12: ...re than 10 minutes Receive the white 100 signal from the Pattern Generator Using the adjustment control set the brightness and contrast to normal position Activate the adjustment mode display of Fig 1 1 and press the channel button 10 on the remote control to select R BIAS Using the VOL UP DOWN button on the remote control adjust the R BIAS Press the CH UP DOWN button on the remote control to sele...

Page 13: ...ntrast to normal position Check if the step No V SHIFT is 0 Adjust the VR401 until the horizontal line becomes fit to the notch of the shadow mask 2 11 OSD HORIZONTAL 1 2 Activate the adjustment mode display of Fig 1 1 Press the VOL UP DOWN button on the remote control until the difference of A and B becomes minimum Refer to Fig 2 3 B A TV 00 OSD 15 Fig 2 3 1 2 3 2 8 VERTICAL LINEARITY Receive the...

Page 14: ...00 AV 2 13 CONSTANT VOLTAGE 1 2 3 4 5 Place the set with Aging Test for more than 15 minutes Connect the digital voltmeter to the TP402 Set condition is AV MODE without signal Using the remote control set the brightness and contrast to normal position Adjust the VR502 until the digital voltmeter is 130 0 5V 2 14 SEPARATION 1 2 1 2 3 4 5 Set the multi sound signal generator for each different L ch ...

Page 15: ...e color bar generator from the green raster pattern to the crosshatch pattern Combine red and blue of the 3 color crosshatch pattern on the center of the screen by adjusting the pair of 4 pole magnets Combine red blue magenta and green by adjusting the pair of 6 pole magnets Adjust the crosshatch pattern to change to white by repeating steps 6 and 7 Turn the unit on and let it warm up for at least...

Page 16: ... LOCATION GUIDE WIRING CONNECTION CRT TU001 CP401 VR502 FB401 S501B CP802A VR401 VR402 J701 J707 J705 CP601 CP701B S501A CP1001 W013 AC IN CP701A J702 T501 MAIN PCB AV PCB J 8 0 1 CP806 TP022 TP024 CP801 R803 R805 CRT PCB CRT CD801 CP802B SPEAKER TP402 IC901 ...

Page 17: ... 1 G IN B IN R IN RF AGC OUT POWER ON CONT H OUT VREG Vcc VIF IN 2 20 SCL 26 SDA 27 INV FBP OUT 10 V PULSE OUT 5 V OUT 28 FPB IN 16 14 STEREO 5V REG Q605 REG Q608 REG Q604 X602 3 579545MHz 31 11 49 8 7V REG OUT P CON 5 7V REG AT5 7V REG OUT Y SW OUT R OUT G OUT 47 10 RECTIFIER 16 B OUT Q606 REG 5V REG Q603 AT 5V 3 4 6 5 2 REAR_AV IN STEREO J701 FEED BACK SW Q507 BUFFER Q502 SWITCHING Q501 FB401 10...

Page 18: ... W039 R1004 R1009 IC1001 W839 W841 W828 C1009 C417 D408 Q706 W041 IC402 R419 J701 J707 J705 W042 W043 W044 C317 W047 C915 W048 W050 W051 W052 W053 D705 C729 C730 W054 W055 W056 W057 W058 C717 C703 C704 Q705 Q707 W061 R420 C721 R721 R720 D706 D709 C728 C726 W064 R749 W067 C1001 C1003 W864 W863 W073 W074 W075 W076 W078 W079 W080 W081 W085 W089 C1527 D1501 D1502 Q1508 R1518 R1519 W092 W093 W094 C732 ...

Page 19: ...142 C140_2 R814 R816 R811 R815 R809 R813 C810 C809 C811 R808 R801 R810 IC901 R903 C908 C332_1 R310 R311 R307 R309 C1002_1 C1004_1 R1011 R1015 IC1502 R1006 R1014 R306 R726 R725 R722 R724 C727 R708 R709 R711 R716 R704 R703 R1008 R1001 R1002 C1521 R1520 R734 R733 C708 R112 C801_2 R723 C609 C103 C104 R108 R710 R731 R902 R901 R728 R109 C1524 C1528_1 R117 R817 R818 R819 R1508 R1513 C108 C107 R437 R002 R...

Page 20: ... CRITICAL FOR SAFETY USE ONES ARE SINCE THESE PARTS MARKED BY CAUTION D001 MTZJ30B W845 W801 TM101 RC DW040 L101 2 7uH IC199 S 24C02BDP 1A MEMORY IC 1 2 3 4 5 6 7 8 SW101 SKHVBED010 20 CH DOWN 25 27 CH UP SW102 SKHVBED010 25 27 CH DOWN SW103 SKHVBED010 25 27 VOL UP SW104 SKHVBED010 25 27 VOL DOWN SW105 SKHVBED010 20 25 27 POWER IC101 OEC7072A MICON IC 1 10 11 12 13 14 15 16 17 18 19 2 20 21 22 23 ...

Page 21: ... 2W R637 10M 1 4W R607 1M 1 4W R621 1 5K 1 4W OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE NOTE THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME D612 MTZJ12B D611 MTZJ12B D610 MTZJ12B D602 MTZJ8 2B W833 W831 W817 W832 L607 15uH UNREG 12V GND AUDIO_OUT_L AUDIO_OUT_R TU_VIDEO GND Y_IN C_IN STEREO 5V GND STEREO 5V TU_AUDIO_OUT GND AUDIO_OUT_L SDA AUDIO_OUT_R SCL GND CLOCK_CONT VD V_OUT OSD_BLK AB...

Page 22: ...C430 0 068 100V MKT C408 150P SL C801_2 100P SL C403 0 22 100V MKT C810 390P B C445 10 50V YK C433 470 35V YK C447_1 330 16V YK C448 10 250V YK C414 100 35V YK C418 1000 25V YK C417 4 7 50V YK C435 0 1 100V MHE C446 1 50V YK R452 180 1 4W R404 220 R451 150 1 4W R428 8 2 1 2W R406 1 1 2W R420 6 8K 1 4W R817 68 R816 390 R802 2 7K 1 4W R422 6 8K 1 2W R446 4 7K 1 2W R411 1K 1 2W R811 4 7K R809 4 7K R8...

Page 23: ...15 1W THE DC VOLTAGE AT EACH PART WAS MEASURED WITH THE DIGITAL TESTER WHEN THE COLOR BROADCAST WAS RECEIVED IN GOOD CONDITION AND PICTURE IS NORMAL NOTE C521_1 220 160V PR C507 470 200V UP C531 1000 16V YK C514 680P 2KV RR C506 0 1 275V PHE840 C513_2 0 1 M C519 0 001 2KV RR C518_1 0 001 250V KX C503 0 001 2KV B C561_1 680P W C533 0 0022 250V NU C502 0 001 2KV B C512 0 0082 M C509 0 047 M C517 0 0...

Page 24: ...IS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME DANS LA NOMENCLATURE DES PIECES N UTILISER QUE CELLS DECRITES DANGEREUSES AN POINT DE VUE SECURITE ETANT LES PIECES REPAREES PAR UN ATTENTION DESCRIBED IN PARTS LIST ONLY CRITICAL FOR SAFETY USE ONES ARE SINCE THESE PARTS MARKED BY CAUTION W828 W839 W805 W842 W841 W864 W863 W868 W869 SCL SDA AUDIO_MUTE SCL SDA P CON 9V REAR_AUDIO_R REAR_AUDIO_L FRONT_...

Page 25: ... 10 16V KA C702 10 16V KA C705 4 7 50V KA C729 10 50V YK C732 10 50V YK C730 47 16V YK C719 47 16V YK C701 10 16V KA C703 10 16V KA R708 75 R743 75 R745 68K R744 68K R711 1K R709 1K R760 1K 1 4W R716 1K R702 10 1 4W R704 1K R703 1K R749 2 2K R722 75 R727 4 7K R728 1K R723 75 R724 470 R731 2 2K R733 1K R726 2 2K R725 1 8K R710 1K R729 8 2K R734 1K R721 1K R720 1K R719 75 OF PRINTING AND SUBJECT TO ...

Page 26: ...AL NOTE C1521 10P CH C1524 0 01 F C1528_1 220P B C1527 10 50V YK C1505 1 50V YK R1522 1K 1 4W R1508 1K R1513 680 R1520 1K R1519 3 9K R1518 3 9K R1510 1K OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE NOTE THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME C_IN STEREO 5V Y_IN GND V1_SW AV1 VIDEO_IN GND VI_C_IN VIDEO_OUT VI_Y_IN S_VIDEO STEREO 5V ON_TIMER G 13 G 14 TMA529 PCB010 TO SOUND 5 7 5 0 MAI...

Page 27: ...rms were measured at the point of the corresponding balloon number in the schematic diagram CHROMA 1 1V 0 1µs div 200mV 20µs div 7 9 200mV 20µs div 0 5V 5ms div 10 8 20V 20µs div 6 0 5V 20µs div 11 1V 20µs div 12 1V 20µs div 1V 20µs div 13 DEFLECTION CRT 14 0 5V 5ms div 15 20V 20µs div 16 2V 20µs div ...

Page 28: ...ding balloon number in the schematic diagram H 2 50V 20µs div 20 10V 5ms div 19 21 50V 20µs div 200V 20µs div 17 22 50V 20µs div SOUND 25 0 5V 1ms div 26 200mV 1ms div 200mV 1ms div 27 28 200mV 1ms div 29 200mV 1ms div 30 200mV 1ms div 31 200mV 1ms div 0 5V 1ms div 32 0 5V 1ms div 33 ...

Page 29: ...101 TU001 201 205 112 201 201 113 PCB010 MAIN PCB J701 J707 107 202 V801 202 202 202 L503 106 111 111 J801 PCB110 CRT PCB 102 108 SP1001 204 110 204 204 PCB250 AV PCB 204 104 109 103 203 105 203 203 204 204 204 203 114 203 203 203 ...

Page 30: ...5WPA0565 BUTTON ASS Y 111 762WPA0009 HOLDER CRT WIRE 112 8995034000 CORD CLIP UL CO 113 800WB0A009 FIBER WASHER 201 8109I30A04 SCREW TAP TITE B WH7 3x10 202 8111J50D05 SCREW TAPPING A GW22 5x35 203 8117540B04 SCREW TAPPING B0 TRUSS 4x20 204 8110630A04 SCREW TAP TITE P BRAZIER 3x10 205 8109630802 SCREW TAP TITE B BRAZIER 3x8 793ACDA155 GIFT BOX JB5L0200 POLYBAG INSTRUCTION J3K00502 WARRANTY SHEET J...

Page 31: ...2MAT C513 P1S300104J CP 0 1 UF 50V Q405 TCATC31980 TRANSISTOR SILICON KTC3198 AT Y GRor C514 C0PLRR7U2K CC 680 PF 2KV RR TC3T0536KG TRANSISTOR SILICON 2SC536KG NP AA C517 C0PLRR713K CC 0 001 UF 2KV RR Q501 T220033260 FET 2SK3326 2 C518 CB3730M13M CC 0 001 UF 250V or Q502 TCAT032034 TRANSISTOR SILICON KTC3203_Y AT CC3KE0M13M CC 0 001 UF 250V Q504 TCATC31980 TRANSISTOR SILICON KTC3198 AT Y GR C519 C...

Page 32: ...7G FILTER SAW TSF5229P3 CF603 1012T4R520 FILTER CERAMIC SFSRA4M50CF00 A0 CF604 1012T4R519 FILTER CERAMIC TRAP TPSRA4M50C00 A0 CP401 069S340010 CONNECTOR PCB SIDE A2361WV2 4P CP502 069S420110 CONNECTOR PCB SIDE A1561WV2 2P CP601 0697270650 CONNECTOR PCB SIDE TKC M07X A1 CP801 069S320010 CONNECTOR PCB SIDE A2361WV2 2P CP806 069W010010 CONNECTOR PCB SIDE 005P 2100 CP1001 069S140419 CONNECTOR PCB SIDE...

Page 33: ...M3L5 19G SPEC NO O R NO A243512 ...

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