Sharp 25MR15J, Service Manual

Page 1: ...are subject to change without prior notice SERVICE MANUAL 25MR15J SHARP CORPORATION MODEL POWER INPUT 120 V AC 60 Hz POWER RATING 92 W PICTURE SIZE Approx 267 sq in CONVERGENCE Magnetic SWEEP DEFLECTION Magnetic FOCUS Hi Bi potential INTERMEDIATE FREQUENCIES Picture IF Carrier Frequency 45 75 MHz Sound IF Carrier Frequency 41 25 MHz Color Sub Carrier Frequency 42 17 MHz Nominal AUDIO POWER OUTPUT ...

Page 2: ...oes not exceed the specified value and that it is regulating correctly 5 Do not use a picture tube other than that specified or make unrecommended circuit modifications to the high voltage circuitry 6 When trouble shooting and taking test measurements on a receiver with excessive high voltage avoid being unnecessarily close to the receiver Do not operate the receiver longer than is necessary to lo...

Page 3: ...mechanical insulators and etc 3 To be sure that no shock hazard exists check for leakage current in the following manner Plug the AC cord directly into a 120 volt AC outlet Do not use an isolation transformer for this test Using two clip leads connect a 1 5k ohm 10 watt resistor paralleled by a 0 15mF capacitor in series with all exposed metal cabinet parts and a known earth ground such as electri...

Page 4: ... that the voltmeter reads 11 2 0 7V 5 Apply external 14 4V DC at TP653 by using an external DC supply TV must be shut off 6 To reset the protector unplug the AC cord and make a short circuit between TP651 and TP652 Now make sure that normal picture appears on the screen 7 If the operation of the horizontal oscillator does not stop in step 5 the circuit must be repaired before the set is returned t...

Page 5: ...in the normal mode Use the reset function in the video adjustment menu to ensure customer controls are in their proper reset position 2 SERVICE NUMBER SELECTION Once in the service mode press the Ch up or Ch down button on the remote controller or at the set The service adjustment number will vary in incrementsofone from S01 to M05 Select the item you wish to adjust 3 DATA NUMBER SELECTION Press t...

Page 6: ...TION 17 00 7F S19 MUTE 00 00 01 03 00 Normal 01 No Y 03 No Vertical S20 ENERGY SAVE OFFSET 20 00 3F Must be set to 23 S21 TIMER 7A 00 1F Must be set to 7A S22 OSD SETUP 00 00 03 S23 TUNER SETUP 00 00 01 Must be set to 00 OP1 OPTION 1 Set to each model 00 00 FF Must be set to 13 OP2 OPTION 2 Set to each model 00 00 FF Must be set to 17 M01 INPUT LEVEL 0A 00 0F M02 ST VCO 20 00 3F M03 FILTER 1C 00 3...

Page 7: ...ice adjustment S04 and adjust data value to obtain 2 35V on the oscilloscope screen Refer to Figure 2 6 Adjust the master screen control until the raster darkens to the point where raster is barely seen 7 Adjust the service adjustments S11 red S12 green and S13 blue to obtain a good grey scale with normal whites at low brightness level 8 Select the service adjustment S19 and reset data to 00 Selec...

Page 8: ...is centered CAPTION POSITION ADJUSTMENT Horizontal 1 Receive a good local channel 2 Enter the service mode and select the service adjustment S18 3 A black text box appears on the screen Refer to Figure 3 4 Adjust S18 data value so that text box is positioned in the center of the screen 3 58MHz TRAP ADJUSTMENT 1 Receive a good local channel 2 Enter the service mode and select the service adjustment...

Page 9: ...4 of IC3001 Stereo pilot signal 9 4kHz 600mVrms 2 Enter the service mode and select the service adjustment M03 3 Adjust the data at the point where OK appears on the screen The OK represents the approximate center of the adjustable range of the data SEPARATION ADJUSTMENT 1 Connect the rms voltmeter to pin 39 of IC3001 2 Receive the following composite stereo signal 1 Composite stereo signal 30 mod...

Page 10: ...10 6 5 4 3 2 1 A B C D E F G H 25MR15J CHASSIS LAYOUT ...

Page 11: ...11 6 5 4 3 2 1 A B C D E F G H 25MR15J BLOCK DIAGRAM ...

Page 12: ...r The wave shapes at the red green and blue cathodes of the picture tube depend on the tint color level and picture control 2 indicates wave form check points See chart waveform measured from point indicated to chassis ground SAFETY NOTES 1 DISCONNECT THE AC PLUG FROM THE AC OUTLET BE FORE REPLACING PARTS 2 SEMICONDUCTOR HEAT SINKS SHOULD BE REGARDED AS POTENTIAL SHOCK HAZARDS WHEN THE CHASSIS IS ...

Page 13: ...13 6 5 4 3 2 1 A B C D E F G H 25MR15J SCHEMATIC DIAGRAM CRT and FRONT AV Unit ...

Page 14: ...14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 A B C D E F G H I J SCHEMATIC DIAGRAM MAIN 1 Unit ...

Page 15: ...16 17 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 A B C D E F G H I J SCHEMATIC DIAGRAM MAIN 2 Unit ...

Page 16: ...18 6 5 4 3 2 1 A B C D E F G H 25MR15J PWB A MAIN Unit Wiring Side PRINTED WIRING BOARD ASSEMBLIES ...

Page 17: ...19 6 5 4 3 2 1 A B C D E F G H 25MR15J PWB A MAIN Unit Chip Parts Side ...

Page 18: ...20 6 5 4 3 2 1 A B C D E F G H 25MR15J PWB H FRONT AV Unit Wiring Side PWB B CRT Unit Wiring Side ...

Page 19: ...RH iX3366CEN2 J I C AU IC2040 VHiKiA7045A 1 J KIA7045AP AE IC2101 VHiM24C16B 1 J M24C16 BN6 AG IC3001 VHiCXA2074Q 1 J CXA2074Q AY TRANSISTORS You can substitute VS2SC2412 C 1 for VS2PD601AR 1 Q201 VS2SC2735 1E J 2SC2735 AC Q301 VS2SD601AR 1 J 2SD601AR AC Q401 VS2SD601AR 1 J 2SD601AR AC Q402 VS2SB709AR 1 J 2SB709AR AC Q403 VS2SD601AR 1 J 2SD601AR AC Q421 VS2SB709AR 1 J 2SB709AR AC Q451 VS2SB709AR 1...

Page 20: ...08 VCKYCY1HB102K J 1000p 50V Ceramic AA C309 VCEA0A1CW337M J 330 16V EL AC C313 VCEA0A1CW476M J 47 16V EL AB C351 VCEA0A1HW106M J 10 50V EL AB C352 VCKYCY1HB332K J 3300p 50V Ceramic AA C354 VCEA0A1HW106M J 10 50V EL AB C355 VCKYCY1HB332K J 3300p 50V Ceramic AA C356 VCEA0A1HW106M J 10 50V EL AB C358 VCEA0A1CW477M J 470 16V EL AC C359 VCEA0A1HW106M J 10 50V EL AB C401 VCKYCY1HB331K J 330p 50V Cerami...

Page 21: ...Carbon AA R511 VRD RA2BE104G J 100k 1 8W Carbon AA R512 VRD RA2BE124G J 120k 1 8W Carbon AA R513 VRD RA2BE473J J 47k 1 8W Carbon AA R514 VRN MD2AL101J J 100 1 10W M Film AA R519 VRD RA2BE153G J 15k 1 8W Carbon AA R520 VRN MD2AL184J J 180k 1 10W M Film AA R523 VRN VV3AB1R2J J 1 2 1W M Film AA S C723 RC EZ0724CEZZ J 100 160V EL AG S C725 RC EZ0724CEZZ J 100 160V EL AG C726 RC KZ0338CEZZ J 560p 2kV C...

Page 22: ...W M Film AA R2016 VRN MD2AL223J J 22k 1 10W M Film AA R2020 VRN MD2AL223J J 22k 1 10W M Film AA R2023 VRN MD2AL223J J 22k 1 10W M Film AA R2024 VRD RA2BE682J J 6 8k 1 8W Carbon AA R2025 VRD RA2BE682J J 6 8k 1 8W Carbon AA R2026 VRD RA2BE682J J 6 8k 1 8W Carbon AA R2027 VRD RA2BE682J J 6 8k 1 8W Carbon AA R2028 VRD RA2BE102J J 1 0k 1 8W Carbon AA R2029 VRN MD2AL103J J 10k 1 10W M Film AA R2032 VRD ...

Page 23: ...D884 VHD1SS119 1 J Diode AB COIL L851 VP MK820K0000 J Peaking 82µH AB CAPACITORS EL Electrolytic C851 VCCSPA1HL391J J 390p 50V Ceramic AA C852 VCCSPA1HL331J J 330p 50V Ceramic AA C853 VCCSPA1HL391J J 390p 50V Ceramic AA C854 RC KZ0024CEZZ J 0 001 2kV Ceramic AC C883 VCEA0A1HW106M J 10 50V EL AB RESISTORS M Ox Metal Oxide R851 VRD RA2BE470J J 47 1 8W Carbon AA R852 VRD RA2BE181J J 180 1 8W Carbon A...

Page 24: ...nnecting Cord AF QCNW 2343PEZZ R Connecting Cord AH QCNW 2565PEZZ R Connecting Cord AD VSP0080PBP8YA R Speaker AK MISCELLANEOUS PARTS PWB H DUNTK9310WEV1 FRONT AV UNIT MISCELLANEOUS PARTS J1001 QJAKE0053GEZZ J Jack Video IN AD J1002 QJAKE0055GEZZ J Jack Audio IN L AD J1003 QJAKE0059GEZZ J Jack Audio IN R AC P1001 QPLGN0561CEZZ J Plug 5 Pin HA AB RRMCG1395CESA M Infrared R C AW TiNS 7425PEZZ R Inst...

Page 25: ...Description Code 27 25MR15J PACKING OF THE SET REAR Use 22 staples to fix the bottom side of packing case Packing Case FRONT Buffer Material Polyethylene Sheet Polyethylene Bag MARK Not Replacement Items Operation Manual Batteries Infrared R C unit ...

Page 26: ...tion may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without prior written permission of the publisher SHARP CORPORATION AV Systems Group Quality Reliability Control Center Yaita Tochigi 329 2193 Japan D SEM P SREC TQ1105 S Mar 2001 Printed in Japan MI KD ...