sharp 28JF73E free download

File name GA20-pages 01-15.pdf

28JF-73E SERVICE MANUAL SE0028JF73E00 Issued: 24th Sept. 2002 GA-20 CHASSIS PAL B/G, I / SECAM L/L', B/G, D/K SYSTEM COLOUR TELEVISION MODEL 28JF-73EES In the interests of user safety (required by safety regulations in some countries) the set should restored to its original condition and only parts identical to those specified should be used. CONTENTS ELECTRICAL SPECIFICATIONS ... 3 IMPORTANT SERVICING NOTES ... 4 CONTROLS & TERMINALS ... 5 ADJUSTMENT PROCEDURES ... 6 LED FLASHING CODES ... 12 PRINTED WIRING BOARDS ... 13 CHASSIS LAYOUT ... 20 ICs ADDITIONAL INFORMATION ... 22 SCHEMATIC DIAGRAMS ... 32 TROUBLESHOOTING TABLES ... 46 PARTS LISTING ... 49 PACKING OF THE SET & ACCESSORIES ... 58 SOURCE OF DOCUMENTATION ... 59 SHARP CORPORATION 1 This document has been published to be used for after sales service only. 28JF-73E SERVICE MANUAL UPDATE LOG SHEET Technical Report No. Technical Bulletin No. Cause / Solution Part No. Page No. Application Data /Serial No. Use this page to keep any special servicing information as Technical Report (Bulletin), Technical Information, etc. If only part number changes are required, just change part number directly the part number in the Parts Listing Section. If you need more information, please refer to the Technical Report (Bulletin). 2 28JF-73E ELECTRICAL SPECIFICATIONS ·Power Input ... 220V-240 Volts AC 50Hz ·Power Consumption Normal Operation (Method IEC60107) ... 77W Stand-by Operation ... 3W ·Picture Intermediate frequency L' ... 33.9MHz L, B/G, D/K,I ... 38.9MHz ·Sound Carrier Trap L' ... 40.4MHz L, D/K ... 32.4MHz B/G ... 33.4MHz I ... 32.9MHz ·Adjacent Sound Carrier Trap L' ... 32.4MHz L, D/K, B/G ... 40.4MHz I ... 40.9MHz ·Adjacent Picture Carrier Trap L' ... 41.9MHz L, D/K, ... 30.9MHz B/G ... 31.9MHz ·Aerial Input Impedance VHF/UHF ... 75 ohm Unbalanced ·Tuning Ranges ... 45.75MHz thru 855.25 MHz VHF: IR A - J / S1 - S41 CH (Hiperband) UHF: I21 - I69 CH CATV Special Channels ·Audio Power Output Rating (MPO) / Impedance Internal Left Speaker ... 10W, 7 Internal Right Speaker ... 10W, 7 ·Speakers Left

File name GA20-pages 16-30.pdf

28JF-73E 25 FB217WJN4 MOTHER UNIT PWB. Copper side. 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 Page 17 2 1 Y 33 X 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 16 28JF-73E FB217WJN4 MOTHER UNIT PWB. Copper side. 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 Page 16 2 1 Y 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 X 17 28JF-73E FB270WJZZ CONTROL UNIT PWB Component side Copper side 25 25 24 24 23 23 22 22 21 21 20 20 19 19 18 18 17 17 16 16 15 15 14 14 13 13 12 12 11 11 10 10 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 X 9 8 7 6 5 4 3 2 1 0 Y X 1 0 Y 1 2 3 4 5 6 7 8 9 18 28JF-73E FB220WJZZ DOUBLE FOCUS UNIT PWB 7 Component side 6 5 4 3 2 1 Y 0 X 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Copper side 7 6 5 4 3 2 1 Y 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 X 19 28JF-73E CHASSIS LAYOUT PWB A (Mother Unit, FB217N4). 20 28JF-73E PWB B CHASSIS LAYOUT (CRT SOCKET UNIT, FB218N2). PWB C CHASSIS LAYOUT (FRONTAL POWER-CONTROL UNIT, FB270ZZ). PWB D CHASSIS LAYOUT (DOUBLE FOCUS UNIT, FB220ZZ). 21 28JF-73E 6 handbook, full pagewidth TDA9886 (IC201) BLOCK DIAGRAM CVAGC(pos) VIF-PLL filter VAGC (1) VPLL 19 (21) CBL RC VCO DIGITAL VCO CONTROL AFC DETECTOR 15 (16) 21 (23) REF AFC 16 external reference signal or 4 MHz crystal TOP TAGC 9 (8) 14 (15) CAGC(neg) TUNER AGC VIF-AGC VIF2 (18) 17 VIF-PLL SOUND TRAPS 4.5 to 6.5 MHz 2 (31) CVBS video output: 2 V (p-p) [1.1 V (p-p) without trap] VIF1 1 (30) TDA9885 TDA9886 (7) 8 SINGLE REFERENCE QSS MIXER INTERCARRIER MIXER AND AM DEMODULATOR MAD (4) 6 SIF AGC CAGC OUTPUT PORTS I 2C-BUS TRANSCEIVER NARROW-BAND FM-PLL DEMODULATOR AUDIO PROCESSING AND SWITCHES (3) 5 AUD DEEM ICs ADDITIONAL INFORMATION 22 3 (1) OP1 OP2 SCL SDA 22 (24) 11 (10) 7 (5) DGND 10 (9) 12 (11) SIOMAD 4 (2) FMPLL sound intercarrier output and MAD select SIF2 audio output 24 (27) SIF1 23 (26) de-emphasis network AFD CAF SUPPLY 20 (22) 18 (20) (6, 12, 13, 14, 17, 19, 25, 28, 29, 32) 13 VP AGND n.c. MHC108 FM-PLL filter (1) Not connected for TDA9885. Pin numbers for TDA9885HN in parenthesis. Fig.1 Block diagram. 28JF-73E TDA9886 (IC201) 7 PINNING PIN SYMBOL VIF1 VIF2 n.c. OP1 FMPLL DEEM AFD DGND n.c. AUD TOP SDA SCL SIOMAD n.c. n.c. n.c. TAGC REF VAGC n.c. CVBS n.c. AGND VPLL VP AFC OP2 n.c. SIF1 SIF2 n.c. n.c. TDA9886T TDA9886TS 1 2 - 3 4 5 6 7 - 8 9 10 11 12 - 13 - 14 15 16 - 17 - 18 19 20 21 22 - 23 24 - - TDA9885T TDA9885TS 1 2 - 3 4 5 6 7 - 8 9 10 11 12 - 13 - 14 15 - 16 17 - 18 19 20 21 22 - 23 24 - - DESCRIPTION TDA9885HN 30 31 32 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 - 17 18 19 20 21 22 23 24 25 26 27 28 29 VIF differential input 1 VIF differential input 2 not connected output port 1; open-collector FM-PLL for loop filter de-emphasis output for capacitor AF decoupling input for capacitor digital ground not connected audio output tuner AGC Take

File name GA20-pages 31-60.pdf

28JF-73E TEA1507 (IC701) Block Diagram h VCC 1 SUPPLY MANAGEMENT internal UVLO start supply START-UP CURRENT SOURCE clamp VALLEY 8 DRAIN HVS n.c. 7 GND 2 S1 M-level VOLTAGE CONTROLLED OSCILLATOR 4 LOGIC 100 mV OVERVOLTAGE PROTECTION DEM FREQUENCY CONTROL OVERTEMPERATURE PROTECTION 3 -1 LOGIC DRIVER Iss 6 DRIVER CTRL POWER-ON RESET LEB S Q blank soft start S2 0.5 V 2.5 V burst detect UVLO R Q 5 OCP Isense TEA1507 MAXIMUM ON-TIME PROTECTION short winding 0.75 V OVERPOWER PROTECTION MGU230 PINNING SYMBOL PIN VCC GND CTRL DEM Isense DRIVER HVS DRAIN 1 2 3 4 5 6 7 8 ground control input input from auxiliary winding for demagnetization timing, OVP and OPP programmable current sense input gate driver output high voltage safety spacer, not connected drain of external MOS switch, input for start-up current and valley sensing Fig.3 Pin configuration. DESCRIPTION supply voltage handbook, halfpage VCC 1 GND 2 8 DRAIN 7 HVS TEA1507 CTRL 3 DEM 4 MGU231 6 DRIVER 5 Isense 31 28JF-73E DESCRIPTION OF SCHEMATIC DIAGRAMS SAFETY NOTE: 1. DISCONNECT THE AC PLUG FROM THE AC OUTLET BEFORE REPLACING PARTS. 2. SEMICONDUCTOR HEAT SINKS SHOULD BE REGARDED AS POTENTIAL SHOCK HAZARDS WHEN THE CHASSIS IS OPERATING. NOTE: 1. The unit of resistance « ohm »is omitted (K=1000 ohms. M= Megaohm). 2. All resistors are 1/8 watt. unless otherwise noted. 3. All capacitors are µF, unless otherwise noted (P= µµF). IMPORTANT SAFETY NOTE: PARTS MARKED WITH « ! » ( ) ARE IMPORTANT FOR MAINTAINING THE SAFETY OF THE SET. BE SURE TO REPLACE THESE PARTS WITH SPECIFIED ONES FOR MAINTAINING THE SAFETY AND PERFORMANCE OF THE SET. SERVICE PRECAUTION: THE AREA ENCLOSED BY THIS LINE ( ) IS DIRECTLY CONNECTED WITH AC MAINS VOLTAGE. WHEN SERVICING THE AREA, CONNECT AN ISOLATING TRANSFORMER BETWEEN TV RECEIVER AND AC LINE TO ELIMINATE HAZARD OF ELECTRIC SHOCK. CAUTION This circuit diagram is original one, therefore there may be slight difference from yours. Waveform Measurement Condition: 1. Test Equipment: DIGITAL SYNCHROSCOPE (LECROY). 2. Test Conditions: CH-12; COLOUR BARS; 70dB FROM RF INPUT 3. TV Condition: PICTURE AND AUDIO : SETTINGS ! FACTORY PRESETS Waveform: 1 Pin1 Vp-p= 2.9V 2 Pin2 Vp-p= 2.9V 3 Pin3 Vp-p= 3.0V 32 28JF-73E 4 Pin4 Vp-p= 105V 5 Pin5 Vp-p= 100V 6 Pin6 Vp-p= 110V 7 Pin7 Vp-p= 0.8V 8 Pin8 Vp-p= 225V 9 Pin9 Vp-p=1200V 10 Pin10 Vp-p= 0.4V 11 Pin11 Vp-p= 2.0V 12 Pin12 Vp-p= 0.5V 13 Pin13 Vp-p=5.6V 14 Pin14 Vp-p= 62V 15 Pin15 Vp-p= 1.3V 33 28JF-73E 16 Pin16 Vp-p= 9.2V 17 Pin17 Vp-p= 0.24V 18 Pin18 Vp-p= 9.6V 19 Pin19 Vp-p= 0.2V 20 Pin20 Vp-p= 9.2V 21 Pin21 Vp-p= 1.4V 22 Pin22 Vp-p= 1.4V 23 Pin23 Vp-p= 0.7V 24 Pin24 Vp-p= 500V 34 28JF-73E SCHEMATIC DIAGRAM OF CRT UNIT (FB218N2) I H G F E D C B A 1 2 3 4 5 6 7 35 28JF-73E SCHEMATIC DIAGRAM OF MAIN 1 (FB217N4) I H G F E D C B Page 37 A 1 2 3 4 5 6 7 36 28JF-73E SCHEMATIC DIAGRAM OF MAIN 1 (FB217N4) I