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21HM-10F

Page 29

SCHEMATIC DIAGRAM OF MOTHER UNIT (F7340N4, 00 Version)

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Summary of Contents for 21HM-10F

Page 1: ...estored to its original condition and only parts identical to those specified should be used This document has been published to be used for after sales service only ELECTRICAL SPECIFICATION 3 IMPORTANT SERVICING NOTES 4 CONTROLS TERMINALS 5 SERVICE ADJUSTMENTS 6 CHASSIS LAYOUT 12 LED FLASHING CODE 13 PRINTED WIRING BOARDS 14 ICs ADITIONAL INFORMATION 19 SCHEMATIC DIAGRAM WAVE FORMS 25 BLOCK DIAGR...

Page 2: ...icture Intermediate Frecuency 38 9MHz Sound Carrier Trap L 40 4MHz L 32 4MHz B G 33 4MHz Adjacent Sound Carrier Trap L 32 4MHz L B G 40 4MHz Adjacent Picture Carrier Trap L 41 9MHz L 30 9MHz B G 30 9MHz Aerial Input Impedance VHF UHF 75 ohm Unbalanced Tuning Ranges L L 55 75MHz thru 855 25 MHz B G 48 25MHz thru 855 25 MHz CATV Special Channels WARNING The chassis in this receiver is partially hot ...

Page 3: ... x ray radiation levels This is a problem when in close proximity to the receiver for long periods of time To reduce any risks associated with this please observe the following precautions 1 When undertaking any servicing on this chassis DO NOT increase the EHT to more than 30 5 KV at a instantaneous beam current of 1300µΑ 2 Ensure that during normal operation the EHT does not exceed 25 0 KV 1 5KV...

Page 4: ...cts next lower programme These are also used for menu set up Single Double Entry button CALL button FLASHBACK buttons Returns to previously viewed programme Location of Controls Remote Control TV Front Euro SCART 21 Pin Terminal 1 Audio right output 2 Audio right input 3 Audio left output 4 Common earth for audio 5 Earth for blue 6 Audio left input 7 Blue input 8 Audio video control 9 Earth for gr...

Page 5: ...inue pressing the volume down and channel up buttons while turning the mains on using the mains switch See Fig 1 5 Keep pressing the volume down and channel up buttons until the picture appears 6 When SHARPX X VXX XX appears on the screen release the two buttons 7 The receiver is now in the service mode See Fig 2 To move between the various service mode functions use the channel up and down button...

Page 6: ...0 32 16 9 FIX 16 DRI RC White point Red Cold white temp 0 32 16 9 FIX 17 DRI GC White point Green Cold white temp 0 32 16 9 FIX 18 DRI BC White point Blue Cold white temp 0 32 16 16 FIX 19 SUB VOL Max Volume 0 63 60 60 FIX 20 SUB CON Sub Contrast 0 63 63 63 FIX 21 SUB COL Sub Colour 0 63 32 18 FIX 22 SUB BRI Sub Brightness 0 63 32 36 FIX 23 TINT Sub Tint 0 63 32 32 FIX 24 SUB SHP Sub Sharpness 0 6...

Page 7: ...Limit 0 disable or 1 enable 0 1 FIX 53 S L Sound system L 0 disable or 1 enable 0 1 FIX 54 S DK Sound system DK 0 disable or 1 enable 1 0 FIX 55 S I Sound system I 0 disable or 1 enable 1 0 FIX 56 S BG Sound system BG 0 disable or 1 enable 1 1 FIX 57 BLUE BACK Video mute at Ident loss 0 disable or 1 enable 1 1 FIX 58 VMC Video Mute at program source Change 0 disable or 1 enable 1 1 FIX 59 HTL Hote...

Page 8: ...LUE BACK 1 12 Turn off the receiver using the mains button 13 The G2 adjustment is now complete 2 Focus Adjustment 1 Receive a monoscope pattern signal at a level of 60 to 80 dBµV 2 Set the picture settings to normal 3 Adjust the focus potentiometer to obtain maximum definition AGC ADJUSTMENT 1 Tune the receiver into a colour bar signal on channel E 12 2 Set the RF generator to an output signal st...

Page 9: ...justments are complete use the standby button to turn off the set The adjustment values will be stored at this point V LIN Adjust the vertical linearity control so that the picture centring is as shown in figure 5 V AMP Adjust the vertical amplitude control so that the picture overscans as shown in figure 6 V CENT Adjust the vertical centring control so that the picture is centred as shown in figu...

Page 10: ...ions to obtain colour co ordinates 6 Re set the TV with the mains switch button to store the adjustment and exit service mode 7 Check colour co ordinates X and Y at 20 a 120 Nits It may be necessary to repeat the same procedure to obtain the above values ADJUSTMENT METHOD 2 using the signal generator with a fixed picture signal 1 Adjust G2 2 Tune a white pattern with burst signal 3 Operate in serv...

Page 11: ...I2 C error occurred let the LED blink at 1 Hz 50 duty cycle For the blinking times see the Table below Note Only when an I2 C error occurs for a number of times or for a number of seconds the I2 C error is handled by the system that is only then the set will go to standby the led starts blinking Table Error LED blinking times SECAM UNIT IC Module Name Slave Address Bus Error LED Remarks Ref No Bli...

Page 12: ...AMETER MIN TYP MAX UNIT Supply VP supply voltages 8 0 3 3 V IP supply current 135 60 mA Input voltages ViVIFrms video IF amplifier sensitivity RMS value 75 µV ViSIF rms QSS sound IF amplifier sensitivity RMS value 60 µV ViAUDIO rms external audio input RMS value 500 mV ViCVBS p p external CVBS Y input peak to peak value 1 0 V ViCHROMA p p external chroma input voltage burst amplitude peak to peak ...

Page 13: ...HIFT V DRIVE CONTR BRIGHTN OSD TEXT INSERT CCC WHITE P ADJ 80C51 CPU I 2 C BUS TRANSCEIVER ROM RAM TELETEXT ACQUISITION 1 10 PAGE MEMORY TELETEXT OSD DISPLAY R G B BL Y U V H V REF ENHANCED VST PWM DAC VST OUT I O PORTS I O PORTS 4x 3 3 V RESET LED OUT 2x ADC IN 4x VPE EW GEOMETRY GEOMETRY EHTO EWD R V G Y B U BL RGB YUV INSERT R G B REF CVBS SYNC H V COR 27 37 38 33 20 29 28 34 44 60 55 59 58 57 ...

Page 14: ...r TV processor DECBG 19 bandgap decoupling AVL EWD 1 20 Automatic Volume Levelling East West drive output VDRB 21 vertical drive B output VDRA 22 vertical drive A output IFIN1 23 IF input 1 IFIN2 24 IF input 2 IREF 25 reference current input VSC 26 vertical sawtooth capacitor TUNERAGC 27 tuner AGC output AUDEEM SIFIN1 1 28 audio deemphasis or SIF input 1 DECSDEM SIFIN2 1 29 decoupling sound demodu...

Page 15: ...G input Y input B2 UIN 48 2nd B input U B Y input BCLIN 49 beam current limiter input V guard input note 2 BLKIN 50 black current input V guard input note 2 RO 51 Red output GO 52 Green output BO 53 Blue output VDDA 54 analog supply of Teletext decoder and digital supply of TV processor 3 3 V VPE 55 OTP Programming Voltage VDDC 56 digital supply to core 3 3 V OSCGND 57 oscillator ground supply XTA...

Page 16: ...START UP CURRENT SOURCE 0 75 V 0 5 V 5 Isense 6 DRIVER MGU230 4 DEM 8 DRAIN 7 HVS n c OCP LEB blank Iss 2 5 V burst detect Block diagram PINNING SYMBOL PIN DESCRIPTION VCC 1 supply voltage GND 2 ground CTRL 3 control input DEM 4 input from auxiliary winding for demagnetization timing OVP and OPP Isense 5 programmable current sense input DRIVER 6 gate driver output HVS 7 high voltage safety spacer ...

Page 17: ...ND Input 8 N C 9 Volume Circuit Function Block Diagram Pin Descriptions Note Do not apply voltage or current to NC pin from outside Pin No Pin Name 1 Inverting Input 2 Power Supply 3 Pump up Output 4 GND 5 Vertical Output 6 Vertical Output Power Supply 7 Non inverting Input Pin Descriptions Non inverting Input Output Vcc Output GND Pump Up Out Vcc Inverting Input 1 2 3 4 5 6 7 Pump Up Thermal Prot...

Page 18: ...NCLOSED 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 IMPOTANT SAFETY NOTE PARTS MARKED WITH ARE IMPORTANT FOR MAINTAINING THE SAFETY OF THE SET BE SURE TO REPLACE T...

Page 19: ...21HM 10F 26 ...

Page 20: ... Secondary Main B Abnormal Approx 110V Normal YES Check D758 IC702 IC753 Check CRT connector K1 D1001 Power LED Bright Red and D762 K5 bias turns on NO Normal Normal Abnormal NO D1001 Power LED Dark Red Check R615 Check Check turns on C878 IC801 Checking the D1001 turns on protector circuit brightly and darkly Bus error NVM IC1002 See many often D1001 TV PROCESSOR flashes in red IC801 This indicat...

Page 21: ...ERTICAL SCAN Check IC501 bias Normal Abnormal Check C502 and C514 Check IC501 NO SPECIFIC COLOUR NO YES Is some colour produced in B W broadcast reception Check IC801 R801 R802 YES Is the white balance R803 D804 D805 D806 properly adjusted and Q801 NO Readjusted the white balance The picture colour is cyan The picture colour is magenta The picture colour is yellow Check Q870 Q885 and Check Q871 Q8...

Page 22: ...ES CH preset data check Does noise or Check IC801 signal appear at and its related Normal pin38 of IC801 circuit NO YES Check the tuner Does noise or AGC at TP201 signal appear at Check Q401 pin23 and 24 Q402 and related Normal Abnormal of IC801 circuit NO YES Check pin38 Check pin27 Check pin 2 4 of of IC801 of IC801 Tuner SA Tuner Check pin37 of and related circuit and related IC801 and circuit ...

Page 23: ... COIL 10UH 10 1 8W S AA AA L 3030 VP CF3R3K0000 PEAK COIL 3 3UH 10 S AB AB CERAMIC FILTERS CF 0401 RFILC0020CEZZ FILTER SIF TRAP TAPED S AE AE TRANSFORMERS T 0601 RTRNZ0026PEZZ DRIVER TRANSFORMER S AA AF T 0602 RTRNF2053CEZZ FBT BSC21 2643S SHENZHEN S AM AY T 0701 RTRNW0005CEZZ SMT TABUCHI S AA AP MARK SPARE PARTS DELIVERY SECTION REF No PARTS DESCRIPTION SN CODE EX CODE PICTURE TUBE VB51EFS83912E...

Page 24: ... AB C 0611 VCFPVC3CA912H PP FILM C 9 1NF 50 1600V S AA AC REF No PARTS DESCRIPTION SN CODE EX CODE C 0614 VCFPVC2DB564J PP FILM C 560NF 5 200V S AA AC C 0615 RC EZ0724CEZZ ELEC C KMF160VB 100MMC NICHICS AA AF C 0616 VCQYTA1HM104J F CAPACITOR 0 1 UF 50 V S AA AB C 0617 VCEA0A1HW105M ELEC C 1UF 20 50V S AA AA C 0619 VCEA0A1HW106M ELEC C 10UF 20 50V S AA AA C 0621 VCEA0A2CW105M ELEC C 1UF 20 160V S A...

Page 25: ...0613 VRD RA2HD184J RES 180KOHM 5 1 2W S AA AA R 0614 VRD RA2HD472J RES 4 7KOHM 5 1 2W S AA AA REF No PARTS DESCRIPTION SN CODE EX CODE R 0615 VRD RA2HD472J RES 4 7KOHM 5 1 2W S AA AA R 0616 VRD RA2HD182J RES 1 8KOHM 5 1 2W S AA AA R 0618 VRD RA2BE123J RES 12KOHM 5 1 8W S AA AA R 0619 VRS CY1JF000J S CHIP RES 0 OHM TAPED S AA AA R 0620 VRD RA2HD220J RES 22 OHM 5 1 2W S AA AA R 0621 VRD RA2HD820J RE...

Page 26: ...00J S CHIP RES 0 OHM TAPED S AA AA MISCELLANEOUS PARTS F 0701 QFS C3229CEZZ FUSE S506 3 15A A1 TOKYO COMPS AA AC F 0751 QFS J2521CEZZ FUSE 2 5A 125V LITTELFUSE KURS AC AD FB 0451 RBLN 0037CEZZ BALUN FBA04HA90088 00 T Y S AB AB FB 0452 RBLN 0037CEZZ BALUN FBA04HA90088 00 T Y S AB AB FB 0601 RBLN 0037CEZZ BALUN FBA04HA90088 00 T Y S AB AB FB 0701 RBLN 0037CEZZ BALUN FBA04HA90088 00 T Y S AB AB FH 07...

Page 27: ... AA C 0263 VCKYCY1HF103Z CHIP CAP 0 01UF 50V S AA AA C 0264 VCEA0A1HW225M ELEC C 2 2UF 20 50V S AA AA C 0265 VCEA0A1HW105M ELEC C 1UF 20 50V S AA AA C 0266 VCEA0A1HW105M ELEC C 1UF 20 50V S AA AA C 0267 VCKYCY1HF103Z CHIP CAP 0 01UF 50V S AA AA C 0268 VCEA0A1CW226M ELEC C 22UF 20 16V S AA AA C 0269 VCEA0A1CW226M ELEC C 22UF 20 16V S AA AA C 0270 VCEA0A1CW106M ELEC C 10UF 20 16V S AA AA C 0271 VCKY...

Page 28: ...21HM 10F SCHEMATIC DIAGRAM OF CRT F7341N0 00 Version GA 1E CHASSIS MODEL 21HM 10F ...

Page 29: ...21HM 10F Page 29 SCHEMATIC DIAGRAM OF MOTHER UNIT F7340N4 00 Version ...

Page 30: ...SCHEMATIC DIAGRAM OF MOTHER UNIT F7340N4 00 Version Page 30 Page 28 ...

Page 31: ...21HM 10F SCHEMATIC DIAGRAM OF MOTHER UNIT F7340N4 00 Version Page 29 ...

Page 32: ...21HM 10F SCHEMATIC DIAGRAM OF SECAM UNIT F7343N0 00 Version ...

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