FisherPCR20R2ServiceManual 电路原理图.pdf
SERVICE MANUAL Colour Television FILE NO. Model No.PC-R20R2 (USA) Service Ref.No.PC-R20R2-00 SPECIFICATIONS Product Code: 1 113 495 46 Original Version Chassis Series: 3Y03 Give complete SERVICE REF.NO. for parts order or servicing. It is shown on the rating plate at the cabinet back of the unit. This T.V. Receiver will not work properly in foreign countries where the television transmission system and power source differ from the design specifications. Refer to the Specification table. Design and specifications are subject to change without prior notice. Receiving System Colour System Picture Tube Ext. Antenna Ext. In/Out Speaker Audio Output Power Consumption Dimension Net Weight REMOTE CONTROL Transmitting System Power Supply Dimension Net Weight REFERENCE NO. SM 2300011 : M : : 20 inch screen : 75 Ohm Coaxial Cable : : (8 Ohm) x 2 : Maximum 3W : AC 120V 60Hz, 84W : 525(W) x 510(D) x 464(H)mm/ 20.7(W) : 22.8 kg/50.26lbs : Infrared : DC 3V (1.5 x 2) : 60(W) x 200(L) x 24(D)mm/ 2.4 : 100 g(approx)/0.22lbs NTSC Audio/Video - In/Out x20.1(D) x 18.3(H)inch (W) x 7.9(L) x 0.9(D)inch Contents Safety Notice.2 Chassis Block Diagram.3 IC Block Diagram .4- 7 PCB Top Layer .8- 9 Service Adjustments .10- 16 Purity and Convergence Adjustment .17 Control Location.18 Input and Output Terminals.19 Operation Instructions.20- 21 Mechanical Disassemblies .22 Cabinet Parts List .23 Circuit Diagram.24 Chassis Electrical Parts List.25- 33 Safety Notice - 2- SAFETY PRECAUTIONS 1:An isolation transformer should be connected in the power line between the receiver and the AC line when a service is performed on the primary of the converter transformer of the set. 2:Comply with all caution and safety- related notes provided on the cabinet back, inside the cabinet, on the chassis or the picture tube. 3:When replacing a chassis in the cabinet, always be certain that all the protective devices are installed properly,such as,control knobs, adjustment covers or shields, barriers,isola- tion resistor- capacitor networks etc. Before returning any television to the customer,the service technician must be sure that it is completely safe to operate without danger of electrical shock. X- RADIATION PRECAUTION The primary source of X- RADIATION in television receiver is the picture tube. The picture tube is specially constructed to limit X- RADIATION emissions. For continued X- RADIATION protection, the replacement tube must be the same type as the original including suffix letter. Excessive high voltage may produce potentially hazardous X- RADIATION. To avoid such hazards, the high voltage must be maintained within specified limit. Refer to this service manual, high voltage adjustment for specific high voltage limit. If high voltage exce- eds specfied limits, take necessary corrective action. Carefully follow the instructions for +B1 volt power supply adjustment, and high voltage check to maintain the high voltage within the specified limits. PRODUCT SAFETY NOTICE Product safety should be considered when a component replacement is made in any area of a receiver. Components indicated by mark in the parts list and the schematic diagram designate components in which safety can be of special significance. It is particularly recommended that only parts designated on the parts list in this manual be used for com- ponent replacement designated by mark . No deviations fromresistance wattage or vol- tage ratings may be made for replacement items designated by mark . ! ! ! LA76814/76810 LC863224A-5V23 TUNER SAW.FIL PRE.AMP R G B Y La4285 EEPROM SDA/SCL 22-25 14-17 RGB AMP CRT La7840 V-OUT H-OUT H-FBP FBP TV-AUDIO AV1/AV2 AUDIOIN VIDEO-IN VIDEO-OUT HEF4O52BP HEF4O53BP POWER 110V (B+) 21V 5V 9V 19-21 24V 9V/12V V.SYN H.SYN SDA SCL RF-AGC AFC VIDEO 11 124140 2328 27 40 10 29 30 21 20 19 14 SPEAKER-L SPEAKER-R I c401 AV1/AV2 VIDEOIN Ic400 IC403 I c301 I c201 Ic001 Ic002 VERTICAL DEFLECTION HORIZONTAL DEFECTION FOUCS SCREEN 27 28 4 5 6 2 Chassis Block Diagram - 3- IC Block Diagram - 4- IC 001 (MULTI SYSTEM COLOR TV CPU) LC863224A IC Block Diagram - 5- IC 201 (IIC BUS SINGLE CHIP VIF,SIF,VIDEO CHROMA) LA76814K LA76814K BLOCK DIAGRAM FBP IN REF HOR GND V/C GND EXT- V IN Y- IN INT- V IN S- C IN V/C VCC VCO COIL EXT- AUDIO IN SVO 10p 330 0.47u 10u 10K 7.5K 330p 4.7K MetalFilm(1%) 0.47u 3K0.01 24K 24K 0.47u 0.01u 16p 1u 10K 680K 2.2u 1u 1u 1K 1K 1000p 1000p 54 50 53 52 51 49 48 47 46 45 44 43 42 41 40 37 36 35 34 33 32 31 30 29 28 39 38 10u 330 1000p 1K 15uH 1K 0.01u 47u VC SAW FILTER AUDIO OUTP RF IF IN IF VCC AF ABL R IN G IN B IN FB IN VCC (912V) R OUT G OUT B OUT VER OUT HOR VCC(9V) HOR OUT 0.01u() 0.022u() 30K 0.01u 100 1u 100K 100K 1K 1K 100 100 BUS DATA BUS CLOCK 0.33u() 0.33u() 10u 0.01u 0.015u 3K 1u 150 0.1u() 150 10u 10 11 12 13 14 1516 17 18 19 20 21 22 23 24 25 26 27 1 2 3 4 5 6 7 8 9 100 Sync Out 0.1u 0.01u 0.1u() 0.1u() 56p 0.01u 5.6k Vcc BPF SPLL BPF FM DET SW DC VOL IF AGC RF AGC VIDEO DET TRAP VIDEO AMP A2C PLL LIM AMP VIF IF Vcc 5V AFT BUS ABL CLAMP OSD CONTRAST BRIGHT CLAMP CLAMP VIDEO SW TRAP DELAYLINE PEAKING CORING BLACK STRETCH SYNC SEP SW DRIVE/CUTOFF OSD SW FBP HOR VCO 1/256 HOR C/D AFC1 AFC2 PHASE SHIFTER HOR OUT HOR Vcc VER RAMP VER C/D VER SEP RGB MATRIX CONTRAST BRIGHT BPF (ON/OFF) DEMO COLOR CLAMP VCO TINT APC1 ACC KILLER XRAY IC Block Diagram - 6- IC301 LA7840 7 65 43 21 GND Ver.OUTPUT OUTPUT STAGE Vcc NON INV.INPUT INVERTINO INPUT Vcc PUMP UP OUT PUMP UP AMP THERMAL PROTECTION - + IC 403(3W AUDIO OUTPUT)LA 4285 + 12654310978 VCC INT + EXT PRE GND INT/EXT SM EVR CONT + 6 + D.C. + PWR NF PWR GND + RL 8 + - EVR 5V IC Block Diagram - 7- IC602 STR- G6653 Comp2 Vth(2) Vth(1) Comp1 GND O.C.P/F.B DRIVE LATCH O.V.P REG. T.S.D VIN 4 START O.S.C - + - + 5 2 S 1 D 3 Comp2 IC603 TLP621 TLP621 1 2 3 4 1:ANODE 2:CATHODE 3:EMITTER 4:COLLECTOT MAIN PCB Top Layer - 8- CRT, FRONT AV 1/OFF) 2 B.GAM 3 Select and Disable B gamma correction(02/ON;3/OFF) 3 R.B.ANG 1 Adjust the demodulation angle of R-Y and B-Y 4 AT.FLESH 0 5 GRAY.MODE 0 Select Test mode (0/White; 1/Gray) 6 CROSS.BW 0 Service Test mode (0/TV; 1/Black; 2/White; 3/Crosshatch) 7 AFC.GAIN 0 Select Horiz. 1st loop gain 1/enforce) 8 H.BLK.SW 0 H BLK R1/left) MENU4 1 FILT.SYS 1 Select Y/C filter mode(0,2/3.58 unsymm.; 1,3/3.58 sym.; 47/no filt) 2 CORING 1 Enable Luminance coring( 0/Off; 1/ON) 3 OSD.CONT 1 4 OSD.HPOS 30 Align the horizontal position of OSD 5 BLK.STR.D 0 Disable black stretch 6 BRIABL.T 0 Align brightness ABL threshold MENU5 1 RF.AGC 31 Align RF AGC threshold - 14- Ver tical size and pincushion adjustment Service Adjustments - 15- OPTION 1 2 AV.CH 3 Select AV numbers(0/ No AV;1/1 AV; 2,3/2AV) 2 SRH.SPEED 0 Select auto search speed(0/fastest, 7/lowest) 3 TDA9852 1 Disable 9852(0/disable; 1/able) 4 TUN.AS.V 1 Select the Tuner address(0/Tuner pin3 to ground;1/pin3 not used) 9852 AUTO.ADJ 1 ADJ.FREQ 0 Disable auto adjusting(0/disable; 1/get into autoadjust mode) 2 ADJUSTING 0 3 FM.LVL 16 4 76075.VOL 0 5 L3-L0 0 input level adjust 6 TC2-TC0 0 timing current alignment data 7 A14-A10 0 stereo alignment data for wideband expander 8 A24-A20 0 stereo alignment data for spectral expander TDA1 1 VOL.RIGHT 125 volume control right 2 VOL.LEFT 125 volume control left 3 GMU 0 mute control for all outputs (general mute ) 4 AVLON 0 auto volume control (with 0.1Vrms-1.1Vrms input to get constant output 0.2Vrms) 5 LOFF 0 switch loudness on/off 6 CCD 0 7 SC2-SC0 2 selection between line in and line out 8 SAP.ID 0 TDA2 1 STERO.ID 1 2 TZCM 0 zero cross mode in volume operation 3 LMU 0 mute control for line out 4 EF2-EF0 0 selection between mono, stereo linear, spatial stereo and pseudo mode 5 L3-L0 0 input level adjust 6 A14-A10 0 stereo alignment data for wideband expander 7 A24-A20 0 stereo alignment data for spectral expander 8 STS 0 stereo level switch - 16- White Balance address White Balance address Data Name E2PROM Address LA76814 ADDRESS #1011 1010B bright 12H #0001 0100B contrast 11H #0001 0101B color 10H #1011 1010B Sub-bright 24H #0001 0011B R.B 1EH #0000 1101B G.B 1FH #0000 1110B B.B 20H #0000 1111B R.D 21H #0001 0000B G.D 22H #0001 0000B B.D 23H #0001 0010B TDA3 1 ADJ 0 stereo adjust on/off 2 AT1-AT2 0 attack time at AVL 3 TC2-TC0 0 timing current alignment data 4 WR.ERR 0 5 RD ERR 0 6 MANU ADJ 0 7 STEREO 0 mode selection for line out 8 SAP 0 mode selection for line out Ver tical size and pincushion adjustment Service Adjustments COLOR PURITY ADJUSTMENT (1) Before color purity adjustment,warm up the TV set over 15 minutes and fully degauss. (2) Receive pure white signal in AV status and set the TV receiver dynamic. (3) Go to factory mod MENU2. After write down the values of R- BIAS and B- BIAS, set the values of R- BIAS and B- BIAS zero. (4) Loosen the clamp screw of the deflection yoke and pull the deflection yoke towards color purity Magnetic loop. (5) Adjust color purity magnetic loop to make the green area at the center of CRT screen. (6) Slowly push the deflection yoke toward the front of CRT and set it where a uniform green field is Obtained. Tighten the clamp screw of the deflection yoke. (7) Restore the values of R- BIAS,G- BIAS AND B- BIAS. CONVERGENCE ADJUSTMENT (1) Receive a dotted pattern. Set the TV receiver dynamic. (2) Loose the convergence magnet clamperrrrr and align red with blu dots at the center of the screen by rotating(R,B) static convergence magnets. (3) Align Red/Blue with green dots at the center of the screen by rotating(RB- G) static convergence magnet. (4) Remove the DY wedges and slightly tilt the deflection yoke horizontally and vertically to obtain the good Purity Magnet RB- G RB Magnet Clamper Static Magnet Purity and Convergence Adjustment - 17- Control Location - 18- 1. Remote Sensor 2. Power Indicator 3. Main Switch 4. Speakers 5. Program Down & Up Button 6. Volume Down & Up Button 7. Menu Button 8. AV/TV Button 9. Front AV In (Option) 10. Audio/Video - In/Out Jack 11. AC Power Cord 12. Terminal Antenna (75 Ohm) 3 215867494 101211 (STEREO) (MONO) Input and Output Terminals - 19- VIDEO AND AUDIO INPUT/OUTPUT TERMINALS 1. Video / Audio input for playback for VCR. 2. Video / Audio output for TV monitor output. *Please keep AC cord unplugged when connecting TV system. RR LL VIDEOVIDEOAUDIOAUDIO AV- IN AV- OUT NOTE: This is a mono CTV even though there are R & L audio input & output jack. These audio R/L input terminals are parallel connected inside and make mixed monaural sound output .There are same monaural audio output come from R/L output terminals. OUTIN VIDEOVIDEOAUDIOAUDIO (STEREO) (MONO) Operation Instructions - 20- Video MenuTime MenuSetup MenuExit Menu 1.Enter the video menu , you can select the picture quality instantly among four preset modes and one user- set mode. (User- set mode) Custom Standard Sports Movies Mild *You can adjust CONTRAST ,BRIGHT , SHARPNESS , COLOR and TINT items by pressing the VOL. +/- buttons . The adjusted level is stored in Custom mode. Turn the TV set on, then power indicator will light up. After a few seconds , the currently program number is displayed on the top right - hand corner of the screen. MENU BUTTON 1.Press this button to select menu. VIDEO, TIME, and SETUP menu can be selected cyclically. 2.After enters each menu, you can select the desired adjusting item by the PROG.+/- buttons, and adjust the item by the VOL. +/- buttons. *When you select a item, symbols / will display both sides of the item. Video menu Video Time Setup Custom Contrast Bright Sharpness Color Tint 16 16 16 16 - 15 Video Time Setup Clock Timer TV On TV Off Off - - :- - - - :- - - - :- - Time menu Video ST SAP Mono On Audio menu(option) 1.ST: Press the VOL.+/- buttons can select the stereo mode , the order shown below: Mono Spatial Linear Psuedo 2.SAP: You can adjust the SAP ON to SAP OFF by the VOL+/- buttons ,. You can use the Second Audio Program when you select the SAP ON . 3.BALANCE: Press the VOL+/- buttons can adjust the left or right volume balance . * The MTS/SAP function is only an option for some models. Audio Time Setup Balance00 Audio Menu Audio Audio (Option) 1.CLOCK: Press the VOL.- button to set hour, and the VOL.+ button set minute . 2.TIMER When you select the Timer ON mode, you can set the time of TV ON or TV OFF. *TV On: The TV will automatically turn on at the preset time. TV Off: The TV will automatically turn off at the preset time. - 21- Operation Instructions 1.SYSTEM you can switch two signals :CABLE and ANTENNA . 2. CHANNEL Select the cable signal ,there are 01125 channels Select the antenna signal , there are 0269 channels . 3.SKIP Select Skip ON by VOL.+/- Buttons to skip unnecessary program number. 4.AUTO SEARCH Press VOL.+/- buttons to start auto searching. 5.FINE TUNE In areas of inferior broadcast conditions where adjustment is necessary for PRESET MENU , CCD MENU AND V- CHIP MENU Preset System Channel Skip Auto Search Fine Tune Antenna 03 Off Closed Caption Mode Channel Field Off Capt. 1 Caption 1 CCD MENU PRESET MENU 1.CAPTION Set the caption OFF or ON . 2.MODE Select the caption mode or teletext mode . 3.CHANNEL Select channel 1 or channel 2 . 4.FIELD Select field 1 or field 2 . V- Chip Input Pwd V- CHIP MENU Input the password 9999 to call up V- Chip, MPAA and TVPG item. V- Chip V- ChipOn MPAA PG TVPGTV- 14 1.V- CHIP Set the V- Chip OFF or ON . 2.MPAA movie rating Select the type of program 3.TVPG(TV Parental Guidelines) Parents can guide their children watching some programmes by the item. 1.After enters the setup menu, you press the PROG+/- buttons to select PRESET MENU, CCD MENU and V- CHIP MENU. 2.Select the Language item by the PROG+/- buttons, and press the VOL.+/- buttons to select the desired language . The screen menu is automatically displayed in that language. The order shown below: English Espanol Por
