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25C340

In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its
original condition and only parts identical to those specified should be used.

ELECTRICAL SPECIFICATIONS ........................................................................................................ 1

IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................ 2

LOCATION OF USER'S CONTROL .................................................................................................... 4

INSTALLATION AND SERVICE INSTRUCTIONS ............................................................................... 5

CHASSIS LAYOUT ............................................................................................................................ 11

BLOCK DIAGRAM ............................................................................................................................. 12

SCHEMATIC DIAGRAMS .................................................................................................................. 13

PRINTED WIRING BOARD ASSEMBLIES ....................................................................................... 19

REPLACEMENT PARTS LIST ........................................................................................................... 22

PACKING OF THE SET ..................................................................................................................... 29

Page

SHARP CORPORATION

This document has been published to be used for after
sales service only.
The contents are subject to change without notice.

CONTENTS

MODEL

ELECTRICAL SPECIFICATIONS

POWER INPUT ..................................................... 120 V AC 60 Hz

POWER RATING .................................................................. 105 W

PICTURE SIZE ........................................... 2,032cm

(315sq inch)

CONVERGENCE ............................................................. Magnetic

SWEEP DEFLECTION .................................................... Magnetic

FOCUS ............................................... Hi-Bi-Potential Electrostatic

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 ..................... 1.5 W+1.5 W (at 10% distortion and

Dual CH Operate)

SPEAKER

SIZE ...................................................................... 8 cm (Round)

VOICE COIL IMPEDANCE ............................. 32 ohm at 400 Hz

ANTENNA INPUT IMPEDANCE

VHF/UHF ..................................................... 75 ohm Unbalanced

TUNING RANGES

VHF-Channels ............................................................... 2 thru 13

UHF-Channels ............................................................ 14 thru 69

CATV Channels ........................................................... 1 thru 125

(EIA, Channel Plan U.S.A.)

Specifications are subject to change without
prior notice.

25C340

COLOR TELEVISION

Chassis No. C/D-BM

SERVICE MANUAL

Содержание 25C340

Страница 1: ...s are subject to change without notice CONTENTS MODEL ELECTRICAL SPECIFICATIONS POWER INPUT 120 V AC 60 Hz POWER RATING 105 W PICTURE SIZE 2 032cm2 315sq inch CONVERGENCE Magnetic SWEEP DEFLECTION Magnetic FOCUS Hi Bi Potential Electrostatic 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...

Страница 2: ...igh voltage anode completely X RADIATION AND HIGH VOLTAGE LIMITS 1 Be sure all service personnel are aware of the procedures and instructions covering X radiation The only potential source of X ray in current solid state TV receivers is the picture tube However the picture tube does not emit measurable X Ray radiation if the high voltage is as specified in the High Voltage Check instructions It is...

Страница 3: ...ks mechanical insulators 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 15µF capacitor in series with all exposed metal cabinet parts and a known earth ground such as electric...

Страница 4: ...nding on the strength of lighting used The degree of illumination will decrease with time and depending on the temperature The time needed to charge the phosphorescent display will vary depending on the surrounding lighting Sunlight and fluorescent lighting are the most effective when charging the display POWER Press On Press again Off REMOTE KEYPAD Accesses any channel from keypad FLASHBACK Retur...

Страница 5: ...tion of the horizontal oscillator does not stop in step 5 the circuit must be repaired before the set is returned to the customer HIGH VOLTAGE CHECK High voltage is not adjustable but must be checked to verify that the receiver is operating within safe and efficient design limitations as specified checks should be as follows 1 Connect an accurate high voltage meter between ground and anode of pict...

Страница 6: ...ideo adjustment menu to ensure customer control are in their proper reset position 2 Service number selection In the service mode you will see the window screen as window 1 There are 4 adjustment categories 2DEF 3SIGNAL 4FEATURE 5FIX VALUE as show in Figure A Press CH UP DOWN button for selection and enter by VOL UP or VOL DOWN Press CH UP DOWN button to select the adjustment item and VOL UP DOWN ...

Страница 7: ... SYS 00 07 01 01 F17 KILLER OP 00 07 02 02 F18 PRE SHOOT 00 03 00 00 F19 CORING 00 03 04 04 F20 DC REST 00 03 02 02 F21 BS START 00 03 01 01 F22 BS GAIN 00 03 01 01 F23 ABL START 00 07 00 00 F24 R B ANGLE 00 0F 08 08 F25 H BLK R 00 0F 03 03 F26 H BLK L 00 0F 00 00 F27 YC 00 07 05 04 SERVICE POSITION ADJUST ITEM DATA RANGE INITIAL VALUE Hex Table A Below are the ranges and initial values for each a...

Страница 8: ...EL 00 07 03 S03 Y MUTE 00 03 00 01 Y MUTE 02 V STOP Y MUTE 03 Activate color killer circuit S04 SUB BIAS 00 FF 30 Must be 30 S05 R BIAS 00 FF 00 S06 G BIAS 00 FF 00 S07 B BIAS 00 7F 00 S08 R DRIVE 00 7F 53 S09 B DRIVE 00 7F 53 S10 CONTRAST 00 7F 5A S11 TINT 00 7F 40 S12 COLOR 00 7F 40 S13 BRIGHTNESS 00 7F 40 S14 BRIGHTNESS 2 00 7F 40 SERVICE POSITION ADJUST ITEM DATA RANGE INITIAL VALUE ADJUSTMENT...

Страница 9: ...evel 00 2 35 Vdc GND 4 Select the service adjustment S03 and set the data value to 01 to turn off the luminance signal Y mute 5 Select the service adjustment S14 and adjust the data value to obtain 2 35 volts as shown in Figure B 6 Adjust the master screen control until the raster darkens to the point where raster is barely seen 7 Adjust the service adjustment S05 red S06 green S07 blue to obtain ...

Страница 10: ...ain for fine adjustment Vertical Size V Linearity and V S Correction Adjustments 1 Receive a good local channel 2 Enter the service mode DEF category and select the adjustment D02 for Vertical Size D05 for V Linearity and D06 for V S Correction Adjustment 3 Set in order D05 for V Linearity D06 for V S Correction and set the data to get the best linearity 4 Then adjust D02 data until it become a pr...

Страница 11: ...11 6 5 4 3 2 1 A B C D E F G H 25C340 CHASSIS LAYOUT PWB A PWB B ...

Страница 12: ...12 6 5 4 3 2 1 A B C D E F G H 25C340 BLOCK DIAGRAM ...

Страница 13: ...normal picture unless otherwise indicated 2 All voltages measured with 1000µ V B W or Color signal WAVEFORM MEASUREMENT CONDITIONS 1 Photographs taken on a standard gated color bar signal the tint setting adjusted for proper color 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 waveform check points See chart wav...

Страница 14: ...8 7 10 9 6 5 4 3 2 1 A B C D E F G H SCHEMATIC DIAGRAM MAIN 1 Unit 25C340 14 ...

Страница 15: ...17 16 15 14 13 12 11 10 18 19 25C340 15 ...

Страница 16: ...8 7 10 9 6 5 4 3 2 1 A B C D E F G H SCHEMATIC DIAGRAM MAIN 1 Unit 25C340 16 ...

Страница 17: ...17 16 19 18 15 14 13 12 11 10 25C340 17 ...

Страница 18: ...6 5 4 3 2 1 A B C D E F G H SCHEMATIC DIAGRAM CRT Unit 25C340 18 ...

Страница 19: ...19 6 5 4 3 2 1 A B C D E F G H 25C340 PRINTED WIRING BOARD ASSEMBLIES PWB B CRT Unit Wiring Side ...

Страница 20: ...20 6 5 4 3 2 1 A B C D E F G H 25C340 PWB A MAIN Unit Wiring Side ...

Страница 21: ...6 5 4 3 2 1 A B C D E F G H 25C340 PWB A MAIN Unit Chip Parts Side 21 ...

Страница 22: ...C1403 VHIM52055FP 1Y X M52055FP AD IC2001 RH IX3528CEZZQ X IX3528CE AN IC2040 VHIPST994C 1 X PST994C AB IC2101 VHIBR24L16F 1Y X BR24L16F AC IC3001 VHICXA2194Q 1Y X CXA2194Q AP IC3371 VHIAN7511 1 X AN7511 AC Q101 VS2SC3198 G 1 X 2SC3198 G AB Q201 VS2SC2735 1EY X 2SC2735 AB Q301 VS2SD601AR 1Y X 2SD601AR AB Q401 VS2SD601AR 1Y X 2SD601AR AB Q451 VS2SB709AR 1Y X 2SB709AR AB Q452 VS2SA1266 Y 1 X 2SA1266...

Страница 23: ...414 VCEA0A1HW225M X 2 2 50V EL AB C416 VCEA0A1HW105M X 1 50V EL AB C451 VCQYTA1HM104J X 0 1 50V Mylar AB C454 VCEA0A1HW475M X 4 7 50V EL AB C456 VCEA0A1HW106M X 10 50V EL AB C491 VCEA0A1CW107M X 100 16V EL AB C492 VCKYCY1HF103ZY X 0 01 50V Ceramic AA C510 VCEA0A1VW477M X 470 35V EL AB C511 VCCSPA2HL180K X 18p 500V Ceramic AB C512 VCFYSA1JB224J X 0 22 63V Mylar AB C513 VCFYSA1JB473J X 0 047 63V Myl...

Страница 24: ...0 1 16W M Ox AA RJ4 VRS CY1JF000JY X 00 1 16W M Ox AA RJ5 VRS CY1JF000JY X 00 1 16W M Ox AA RJ6 VRS CY1JF000JY X 00 1 16W M Ox AA RJ10 VRS CY1JF000JY X 00 1 16W M Ox AA RJ11 VRS CY1JF000JY X 00 1 16W M Ox AA RJ14 VRS CY1JF000JY X 00 1 16W M Ox AA RJ15 VRS CY1JF000JY X 00 1 16W M Ox AA RJ16 VRS CY1JF000JY X 00 1 16W M Ox AA RJ17 VRS CY1JF000JY X 00 1 16W M Ox AA U R53 VRS RG3LB223J X 22k 3W M Ox AB...

Страница 25: ...RS CY1JF562JY X 5 6k 1 16W M Ox AA R747 VRS CY1JF682JY X 6 8k 1 16W M Ox AA R752 VRD RA2BE392JY X 3 9k 1 8W Carbon AA U R758 VRS RG2HC100J X 10 1 2W M Ox AB R762 VRS CY1JF103JY X 10k 1 16W M Ox AA U R773 VRS RG3LB270J X 27 3W M Ox AB U R774 VRS RG3LB680J X 68 3W M Ox AB R801 VRD RM2HD470JY X 47 1 2W Carbon AA R807 VRS CY1JF332JY X 3 3k 1 16W M Ox AA R808 VRS CY1JF272JY X 2 7k 1 16W M Ox AA R809 VR...

Страница 26: ...S2501 QSW K0202PEZZ X Switch AB S2502 QSW K0202PEZZ X Switch AB S2503 QSW K0202PEZZ X Switch AB S2504 QSW K0202PEZZ X Switch AB S2505 QSW K0202PEZZ X Switch AB S2506 QSW K0202PEZZ X Switch AB PWB B DUNTK9510WEV1 CRT Unit RESISTORS M Ox Metal Oxide M Film Metal Film Ref No Part No Description Code RY701 RRLYJ0081CEZZ X Relay AD F701 QFS B4023CEZZ X FUSE 4A 125V AB FB601 RBLN 0047CEZZY X FERRITE BEA...

Страница 27: ...10GJ00 X Himeron 550X7 AB PSPAN0103GJZZ X Spacer for cabinet AB QCNW 0134MEZZ X WIRE SPEAKER AB QCNW 0166MEZZ X WIRE GBN AB QCNW 0167MEZZ X WIRE YBN AB TCAUH3045GJZZ X caution card AB TLABN0101GJZZ X VSP0080PBQ4YA X speaker VSP0080PBQ4YA X speaker XTASD30P12000 X XTASD40P20000 X Screw Cab AA Screw BTN AA AE AE Remark label chassis ID AB PWB B DUNTK9510WEV1 CRT Unit RESISTORS M Ox Metal Oxide M Fil...

Страница 28: ...lacement items FRONT Buffer Material Polyethylene Sheet Polyethylene Bag Operation Manual Infrared R C Unit Batteries REAR Use tape to fix the top side of packing case Use 12 staples to fix the bottom side of packing case Bar Code Label 25C340 28 ...

Страница 29: ...ans electronic mechanical photocopying recording or otherwise without prior written permission of the publisher QRC0021 U April 2004 Modify SEMEX J B Design and Production Information Design SEM Production SEMEX 25C340 SHARP ELECTRONICA MEXICO S A DE C V Quality Reliability Control Center Blvd SHARP No 3510 Parque Industrial Rosarito Playas de Rosarito México B C 22710 ...

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