Sharp CX48K4, Service Manual

Page 1: ...TEL MODE APPLICATION 15 TROUBLE SHOOTING TABLE 16 SOLID STATE DEVICE BASE DIAGRAM 18 CHASSIS LAYOUT 19 BLOCK DIAGRAM 20 WAVEFORMS 23 DESCRIPTION OF SCHEMATIC DIAGRAM 24 SCHEMATIC DIAGRAM Ë REMOTE CONTROL UNIT 24 Ë TUNER 25 Page Ë MAIN UNIT 26 Ë CRT UNIT 28 Ë HEADPHONE UNIT 28 PRINTED WIRING BOARD ASSEMBLIES 29 REPLACEMENT PARTS LIST Ë ELECTRICAL PARTS MAIN UNIT 34 CRT UNIT 38 HEADPHONE UNIT 38 Ë S...

Page 2: ...th tube of the same type number for continued safety 3 Do not lift picture tube by the neck 4 Handle the picture tube only when wearing shatterproof goggles and after discharging the high voltage completely X RAY This receiver is designed so that any X Ray radiation is kept to an absolute minimum Since certain malfunctions or servicing may produce potentially hazardous radiation with prolonged exp...

Page 3: ...6 3 Make sure the data need modify or not Initial data Note Once the chassis has been assembly together and ready to be POWER ON for the FIRST TIME make sure to make a short circuit JA122 and JA124 switch to the service mode position first and then turn on the main power switch See 2 1 above Precaution If haven t done this initiation it may possibly generate excessive Beam current 3 For reference ...

Page 4: ...ULATION GAIN FOR BTSC SIGNAL BTSC A A NUMBER OF EXT AV SOURCE AV FM WINDOW SEVECTION FMWS SOUND MUTE BIT 0 SM0 SOUND MUTE BIT 1 SM1 THAI LANGUAGE THA ARABIC LANGUAGE ARA MALAY LANGUAGE MAL CHINESE LANGUAGE CHI FRENCH LANGUAGE FRE RUSSIAN LANGUAGE RUS FORCED V SYNC SLICING LEVEL FSL SYNC OF OSD HP2 TUNER CRT CRT B B BILINGUAL BIL IF AGC SPEED BIT 0 AGC0 IF AGC SPEED BIT 1 AGC1 FOA Time Constant RF ...

Page 5: ...ECAM SHP OS 0 15 4 FIX Note Fixed data please do not change without specific instruction 1 Manually change to 20 2 Manually change to 2 3 Manually change to 0 EEPROM ITEMS OSD DATA LENGTH INITIAL DATA FIX ADJ REMARK SHARPNESS OFFSET NTSC358 SHP O3 0 15 12 FIX SHARPNESS OFFSET NTSC443 SHP O4 0 15 8 FIX VERTICAL SCAN DISABLE VSD 0 DISABLE 1 ENABLE 0 FIX BLACK STRETCH BKS 0 DISABLE 1 ENABLE 1 FIX AUT...

Page 6: ...25 M 29 193 25 M 29 112 25 B G 30 217 25 M 30 168 25 B G 31 471 25 M 31 32 477 25 M 32 294 25 B G 33 693 25 M 33 463 25 B G 34 34 174 95 B G 35 112 25 B G 35 175 55 B G 36 168 25 B G 36 37 37 599 25 B G 38 294 25 B G 38 39 463 25 B G 39 40 40 41 647 25 B G 41 42 663 25 B G 42 43 679 25 B G 43 44 174 95 B G 45 175 55 B G INITIAL SETTING 1 In service mode After execute select POS 1 store the followi...

Page 7: ...g 2 Note Be sure to keep the tuner cover in position during this adjustment E 9 CH P C 10k 100k 1n60 75ohm IF OUT 1 5 0 8dB 1000p Oscilloscope Fig 2 Fig 3 PURITY ADJUSTMENT NO Adjustment part Adjusting procedure and conditions Waveform and others 1 PURITY ADJ 1 Receive the GREEN ONLY signal Adjust the beam current to about 700 µA 2 Degauss the CRT enough with the degausing coil Note Follow the Job...

Page 8: ...ly line 5 will be the brighter than line 4 1 Switch TV to VIDEO mode BLUE BACK OFF with NO VIDEO signal 2 Press R C to set Picture Normal condition 3 Connect the oscilloscope to Red OUT from IC801 TP852 Range 1 V Div DC Sweep 5 msec Div 4 Adjust SCREEN VR so that the tip of signal reach 3 0 0 1 Vdc CRT CUT OFF BACKGROUND AND SUB CONTRAST ADJUSTMENT NO Adjustment part Adjusting procedure and condit...

Page 9: ...nt part Adjusting procedure and conditions Waveform and others 1 SUB TINT I2 C BUS CONTROL 1 Receive the NTSC3 58 Colour Bar signal through AV in 2 Connect the oscilloscope to TP853 Pin 5 of P882 BLUE OUT Range 100mV div AC UseProbe10 1 Sweep time 10 µsec div 3 Call the SUB TINT mode in service mode Adjust the SUB TINT bus data to obtain the waveform shown as Fig 9 4 Clear the SERVICE mode PROTECT...

Page 10: ...e If nothing is display mean contrast colour bright tint or sharpness are all in normal setting 8 White Temp 1 Receive Monoscope Pattern signal 2 Set FUNCTION to select WHITE TEMP 3 Press Volume Up Down key to check WHITE TEMP Option STANDARD NORMAL SETTING WARM for more REDDISH direction changing COOL for more BLUISH direction changing FUNCTION OPERATION CHECKING VIDEO AND AUDIO Continued NO Adju...

Page 11: ...SITION FF 00 FF 2A 2B 2C 2D OSD REFERENCE 0F 00 0F 2E CUTOFF LEVEL OFFSET R 08 00 0F 2F CUTOFF LEVEL OFFSET B 08 00 0F 30 CATHODE DRIVE LEVEL 00 00 0F 31 Y DELAY TV PAL 0C 00 0F 32 Y DELAY TV SECAM 0F 00 0F 33 Y DELAY TV N358 0C 00 0F 34 Y DELAY TV N443 0C 00 0F 35 Y DELAY TV BW 0C 00 0F 36 Y DELAY AV PAL 0C 00 0F 37 Y DELAY AV SECAM 0F 00 0F 38 Y DELAY AV N443 0C 00 0F 39 Y DELAY AV N358 0C 00 0F...

Page 12: ... D2 D1 D0 DEFAULT RANGE WRITE CPU CHECK DATA CHECK TYPE CHECK DATA CHECK TYPE SETTING DATA REMARK 40 SHARPNESS OFFSET SECAM 04 00 0F 41 SHARPNESS OFFSET N443 0C 00 0F 42 SHARPNESS OFFSET N358 08 00 0F 43 44 FCO ACL OSO EHT EVG FFI AVL BKS 00 FF 45 SCM N443 N358 PB SEC BG I DK M 00 FF 46 SM FMWS AV BTSC HTL VMC VMI 00 FF 47 HP2 FSL RUS FRA CHN MLY ARB THA 00 FF 48 AGC BIL OBA 00 FF 49 4A 4B 4C VOLU...

Page 13: ...ROM EEPROM CHASSIS CTV FINAL LAST INITIAL HEX D7 D6 D5 D4 D3 D2 D1 D0 DEFAULT RANGE WRITE CPU CHECK DATA CHECK TYPE CHECK DATA CHECK TYPE SETTING DATA REMARK C0 TUNING FREQUANCY LOWER PART POS 25 C1 S SYS AFT auto C SYS C2 TUNING FREQUANCY HIGHER PART POS 26 C3 TUNING FREQUANCY LOWER PART C4 S SYS AFT auto C SYS C5 TUNING FREQUANCY HIGHER PART POS 27 C6 TUNING FREQUANCY LOWER PART C7 S SYS AFT aut...

Page 14: ... FREQUANCY LOWER PART 14B S SYS AFT auto C SYS 14C TUNING FREQUANCY HIGHER PART POS 72 14D TUNING FREQUANCY LOWER PART 14E S SYS AFT auto C SYS 14F TUNING FREQUANCY HIGHER PART POS 73 150 TUNING FREQUANCY LOWER PART 151 S SYS AFT auto C SYS 152 TUNING FREQUANCY HIGHER PART POS 74 153 TUNING FREQUANCY LOWER PART 154 S SYS AFT auto C SYS 155 TUNING FREQUANCY HIGHER PART POS 75 156 TUNING FREQUANCY L...

Page 15: ...l be the last ch which you received before power off same as normal operation CONDITION When using hotel mode user can control contrast brightness sharpness and tint function But after power off it will return to the initial setting You can t use Preset mode Fine tuning Skip mode System selection The others function is allowed to be used 1 Ch 1 is your selected channel for hotel mode Input 1 3 7 a...

Page 16: ...ignal is received Check the tuner supply voltage LB must be approx 5V BT must be approx 32V and CH preset data check Check the tuner AGC at TP201 Does noise or signal appear at pin 38 of IC801 Check IC801 and its related circuit Check Q205 and related circuit Check pin 1 of SF201 Tuner and related circuit Check pin 37 of IC801 and related circuit Check C356 and peripheral circuit Check pin 27 of I...

Page 17: ...l linearity and size abnormal TROUBLE SHOOTING TABLE Continued NO SPECIFIC COLOUR Is some colour produced in B W broadcast reception Is the white balance properly adjusted Readjust the white balance The picture colour is yellow The picture colour is magenta The picture colour is cyan Check Q871 Q883 and its adjacent circuits Check Q870 Q885 and its adjacent circuits Check Q872 Q887 and its adjacen...

Page 18: ...A1015 2SC1815 2SC2482 PST573J DX0386CE BASE COLLECTOR EMITTER BASE COLLECTOR EMITTER B C E KA7808 KA7805 1 2 3 ANODE RED CATHODE COMMON ANODE GREEN 1 2 3 SE115N STRF6654 TDA7056A PX0423CE 2SD2586 1 12 2R BR COLLECTOR COLLECTOR BASE EMITTER 2SC2735 JC COLLECTOR BASE EMITTER BASE EMITTER 1 8 LA7016 1 3 TA48M033 1 3 5 2 4 9 TDA8357 B C E TF321S B C E 2SC4517 ...

Page 19: ...19 6 5 4 3 2 1 A B C D E F G H CX48K4 CHASSIS LAYOUT ...

Page 20: ...21 CX48K4 20 BLOCK DIAGRAM 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ...

Page 21: ...22 6 5 4 3 2 1 A B C D E F G H CX48K4 ...

Page 22: ... 0 98 Vp p 1 3 15 Vp p H 2 3 02 Vp p H 3 3 28Vp p H 4 81 8 Vp p H 5 80 0 Vp p H 6 89 4 Vp p H 7 3 10 Vp p H 8 1 85 Vp p H 9 129 0 Vp p H 0 8 38 Vp p H q 1 08 Vp p H w 0 83 Vp p H e 46 6 Vp p H r 130 0 Vp p H t 952 Vp p H y 2 7 Vp p H u 504 Vp p H i ...

Page 23: ...AN ISOLATING TRANS FORMER BETWEEN TV RECEIVER AND AC LINE TO ELIMINATE HAZARD OF ELECTRIC SHOCK NOTES 1 The unit of resistance ohm is omitted K 1000 ohms M Meg ohm 2 All resistors are 1 16 watt unless otherwise noted 3 All capacitors are µF unless therwise noted P µµF VOLTAGE MEASUREMENT CONDITIONS 1 Voltage in parenthesis measured with no Signal 2 Voltages without parenthesis measured with PAL Co...

Page 24: ...25 6 5 4 3 2 1 A B C D E F G H CX48K4 Ë Tuner NOTE The parts here shown are supplied as an assembly but not independently å VTUATEDE9 023 ...

Page 25: ...27 CX48K4 26 SCHEMATIC DIAGRAM MAIN Unit 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ...

Page 26: ...28 6 5 4 3 2 1 A B C D E F G H CX48K4 SCHEMATIC DIAGRAM CRT and HEADPHONE Unit ...

Page 27: ...29 6 5 4 3 2 1 A B C D E F G H CX48K4 PRINTED WIRING BOARD ASSEMBLIES PWB B CRT Unit Wiring Side Component Side Chip Parts Side PWB C HEADPHONE Unit ...

Page 28: ...31 CX48K4 30 PWB A MAIN Unit Component Side 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ...

Page 29: ...33 CX48K4 32 PWB A MAIN Unit Chip Parts Side 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ...

Page 30: ... R 2SC2482 AD Q602 VS2SD2586 1E R 2SD2586 AM Q603 VS2SD601A 1 R 2SD601A AC Q710 VS2SC4517 1 R 2SC4517 AG Q711 VS2SD601A 1 R 2SD601A AC Q723 VS2SD601A 1 R 2SD601A AC Q751 VS2SA1015G 1E R 2SA1015G AC Q752 VS2SC1815GW 1 R 2SC1815GW AB Q753 VS2SC1815GW 1 R 2SC1815GW AB Q801 VS2SB709A 1 R 2SB709A AA Q802 VS2SB709A 1 R 2SB709A AA Q1003 VS2SD601A 1 R 2SD601A AC Q1010 VS2SD601A 1 R 2SD601A AC DIODES D201 ...

Page 31: ...102K R 1000p 500V Ceramic AA C356 VCKYCY1HB682K R 6800p 50V Ceramic AA C359 VCEA9M1CW106M R 10 16V Electrolytic AB C360 VCEA9M1HW225M R 2 2 50V Electrolytic AB C364 VCEA0A1CW106M R 10 16V Electrolytic AB C371 VCEA0A1CW476M R 47 16V Electrolytic AB C373 VCEA0A1CW107M R 100 16V Electrolytic AC C374 VCEA0A1HW225M R 2 2 50V Electrolytic AB C375 VCEAEA1HW225M R 2 2 50V Electrolytic AB C377 VCEA0A1HW225...

Page 32: ... R 0 1 10W Metal Film AA RJ64 VRN MD2AL000J R 0 1 10W Metal Film AA RJ66 VRN MD2AL000J R 0 1 10W Metal Film AA RJ68 VRN MD2AL000J R 0 1 10W Metal Film AA RJ69 VRN MD2AL000J R 0 1 10W Metal Film AA RJ71 VRN MD2AL000J R 0 1 10W Metal Film AA RJ74 VRN MD2AL000J R 0 1 10W Metal Film AA RJ75 VRN MD2AL000J R 0 1 10W Metal Film AA RJ76 VRN MD2AL000J R 0 1 10W Metal Film AA RJ78 VRN MD2AL000J R 0 1 10W Me...

Page 33: ...R750 VRD RM2HD4R7J R 4 7 1 2W Carbon AA R752 VRD RA2BE682J R 6 8k 1 8W Carbon AA R753 VRS VV3LB472J R 4 7k 3W Metal Oxide AB R755 VRD RA2BE222J R 2 2k 1 8W Carbon AA R756 VRN MD2AL152J R 1 5k 1 10W Metal Film AA R757 VRD RA2BE182J R 1 8k 1 8W Carbon AA R758 VRD RA2BE102J R 1 0k 1 8W Carbon AA R759 VRN MD2AL102J R 1 0k 1 10W Metal Film AA R760 VRD RA2BE471J R 470 1 8W Carbon AA R761 VRD RA2BE221J R...

Page 34: ...3 VHD1SS82 1A R Diode AC D884 VHD1SS82 1A R Diode AC D885 VHD1SS82 1A R Diode AC D886 VHD1SS82 1A R Diode AC D887 VHD1SS82 1A R Diode AC D888 VHD1SS82 1A R Diode AC D890 RH DX0627GEZZ R Zender Diode AA CAPACITORS C871 VCKYPA1HB471K R 470p 50V Ceramic AA C872 VCKYPA1HB471K R 470p 50V Ceramic AA C873 VCKYPA1HB471K R 470p 50V Ceramic AA C875 VCKYPA2HB102K R 1000p 500V Ceramic AA C876 RC KZ0150CEZZ R ...

Page 35: ...abel 1 CCABA2562WEA0 A Front Cabinet Ass y 1 1 Not Available Front Cabinet 1 2 GCOVA0115PESA J Cover LED R C Receiver AB 1 3 HBDGB0015PESA J Badge SHARP AE 1 4 JBTN 0319PESA J Button Control AD 1 5 JBTN 0318PESA J Button Power AE 1 6 MSPRC0008PEFW R Spring for Power Button AB 2 GCABB2406WEV0 A Rear Cabinet Ass y SPAKC5411CEZZ Packing Case SPAKP0088PEZZ Wrapping Paper SPAKX2898CEZZ Buffer Material ...

Page 36: ...ublication 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 TQ0859 S Mar 2000 Printed in Japan NA KG ...