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SERVICE MANUAL

21 SYSTEM

COLOUR TELEVISION

Chassis No. 2IA- M

MODEL

21N52-E1

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

Power Input ................................ 110-240VAC

50/60Hz (Auto)

Power Consumption ................................. 107w
Convergence .................. Self Converging System
Focus ...... Bi-Potential, Uni-Potential Electrostatic
Sweep Deflection ................................ Magnetic

Intermediate Frequencies

Picture IF Carrier ................................ 38.9M Hz
Sound IF Carrier

6.5MHz .........................................

6.0MHz ......................................... . 32.9MHz

5.5MHz ......................................... . 33.4MHz

4.5MHz ......................................... . 34.4MHz

Colour Sub-Carrier

PAL/NTSC ..................................... 34.47M Hz

SECAM ............................

34.494/34.65MHz

NTSC ............................................ 35.32MHz

Audio Power Output Rating ........ 2.5W x 2 (Max.)
Speaker

Size ............................. . 8cm x 4cm Oval x 2 pcs

Voice Coil Impedance ............. 8 ohms at 400 Hz

Specifications are subject to change without prior

notice.

Aerial Input Impedance ,......, 75 ohm Unbalanced

Receiving Channels

PAL-B/G, SECAM-B/G

VHF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..

E2 thru El2

UHF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 thru 69
CATV .......................,...............

S1 thru S3,

M1 thru M10

U1 thru U10

PAL-D/K, SECAM-D/K

VHF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . R1 thru R12

UHF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 thru 69

PAL-l

VHF . . . . . . . . . . . . . . . . . . . . . (IRELAND):

B thru J

UHF .................. (U.K., H.K.): 21 thru 69

NTSC-M

VHF . . . . . . . . . . . . . . . . . . . . . . . . . . . (US):

2 thru 13

(JAPAN):

1 thru 12

UHF . . . . . . . . . . . . . . . . . . . . . . . . . . . (US): 14 thru 83

(JAPAN): 13 thru 62

CATV .................................... A-6 thru A-1,

A thru W,

Receiving Frequency

VHF . . . . . . . . . . . . . . . . . . . . . . . . . 48.25 thru 301.25 MHz

UHF . . . . . . . . . . . . . . . . . . . . . . . . .

471.25 thru 885.25 MHz

WARNING

The chassis in this receiver is partially hot. Use an isolation transformer between the line cord plug and

power receptacle, when servicing this chassis.
To prevent electric shock, do not remove cover. No user -
qualified service personnel.

serviceable parts inside. Refer servicing to

SHARP CORPORATION

Содержание 21N52-E1

Страница 1: ...Power Output Rating 2 5W x 2 Max Speaker Size 8cm x 4cm Oval x 2 pcs Voice Coil Impedance 8 ohms at 400 Hz Specifications are subject to change without prior notice Aerial Input Impedance 75 ohm Unbalanced Receiving Channels PAL B G SECAM B G VHF E2 thru El2 UHF 21 thru 69 CATV S1 thru S3 M1 thru M10 U1 thru U10 PAL D K SECAM D K VHF R1 thru R12 UHF 21 thru 69 PAL l VHF IRELAND B thru J UHF U K H ...

Страница 2: ...s kept to an absolute minimum Since certain malfunctions or servicing may produce potentially hazardous radiation with prolonged exposure at close range the following precautions should be observed 1 When repairing the circuit be sure not to increase the high voltage to more than 27 3kV at cut off for the set 2 To keep the set in a normal operation be sure to make it function on 25 3kV 15kV at bea...

Страница 3: ...dB to the tuner AGC terminal Connect 10k ohm resistor between base of 4203 and 12V line Adjust the tuner IF coils to obtain the waveform as shown figure below NOTE For the adjustment keep the tuner covered with its lid C P 4 43MHz P 38 9 MHz cLx l O O SdB Adjust so that Plland C are at the same eve P DETECTOR COIL T1202 This coil in IF unit has been factory 5 Adjust T1202 so that 38 9 MHz signal i...

Страница 4: ...e approx lVp p AFT COIL T1201 Before this adjustment the AFT coil rough adjustment must have been completed 1 Receive PAL COLOUR BAR signal with colour bar generator e Signal strength Over 55dB Below 80dB 2 Connect oscilloscope to TP401 l Oscilloscope range 0 5 V DIV l Sweep time 20 PsedDlV l Synchronization Horizontal sync 3 Connect the output of SSG Standard Signal Generator to the tuner IF outp...

Страница 5: ...IN CONTROL R218 1 Receive PAL COLOUR BAR signal with colour bar generator l Signal strength 53dB 1dB with 75Q terminated 2 Connect DC voltmeter to the tuner AGC terminal TP201 Full scale 1OV 3 Turn R218 so that the voltmeter reads the maximum output 4 Slowly turn R218 in the opposite direction until the voltmeter begins to decrease its reading then stop turning of R218 5 Set the signal strength at...

Страница 6: ...er to pin 9 of IC1201 Full scale 1OV 4 AUDIO MUTE ON Have pin 4 of IF unit grounded and read the value then available on the voltmeter VTVM It should be approx 4 5V 5 AUDIO MUTE OFF Remove the grounding at pin 4 of IF unit 6 Adjust T301 so that the voltmeter indicates the same value as in step 4 above AUDIO MUTE CHECKING 1 Receive PAL COLOUR BAR signal 2 Set the Sound control at maximum position 3...

Страница 7: ...rned So touching off the Bias control belonging to the first colour use and move the other two controls so that the horizontal raster becomes white WHITE BALANCE AND BACK GROUND l R857 Green Drive control l R863 Blue Drive control l R436 Sub Contrast control Note Prior to this adjustment warm up the unit with the beam current of more than 700pA for more than 30 minutes I Receive MONOSCOPE PATTERN ...

Страница 8: ...ntrol key of the remote controller so that the output waveform of colour difference signal becomes Z SVp p 6 Adjust IH delay amp control R806 and 1 H delay phase control T801 so that the output waveform shown in Fig a is corrected to that shown in Fig 6 7 Return 5401 to CENTER position W Y Cy G Mq R B Figure a Waveform before the adjustment c Figure b Waveform after the adjustment PAL SUB COLOUR A...

Страница 9: ... Time 20 psec div 3 Adjust T904 to obtain maximum DC voltage approx 7 5V at TP902 B Y T901 R Y T902 DISCRIMINATOR ADJUSTMENT Note Connect a O OOlvF capacitor to TP851 and TP853 respectively to filter out interference noise TP851 rl I 2 3 4 5 Receive SECAM COLOUR BAR signal with colour generator Connect the oscilloscope with two channels to TP851 R Y and the TP853 B Y both located on the CRT Socket...

Страница 10: ...the N key on the remote controller 4 Set service switch 5401 at the Video Cut Same level y d position to cut off the Y signal 5 Operating the Colour control key on the remote controller adjust the B Y waveform to approx 3Vp p B Y W Y Cy G Mg R B 6 Adjust Sub Hue control R835 so that the waveform is obtained 7 Return 5401 to CENTER normal position IO ...

Страница 11: ...ter of picture is at the position which gives the relation of A B VERTICAL LINEARITY CONTROL R526 1 Receive MONO SCOPE PATTERN signal 2 Adjust R526 so that the vertical linearity of picture is at best point VERTICAL SIZE CONTROL R503 1 Receive MONO SCOPE PATTERN signal 3 Adjust R503 so that the vertical size of picture 2 Set the Brightness and Contrast controls at is at best point maximum position...

Страница 12: ...the position which gives zero 0 magnetic field Adjustment 6 Observe the green spots a and b with a microscope as shown Fig A and adjust the purity magnet so that they are at the specified landing position 7 If the right and left green spots are both deviated outwards from their landing positions as shown in Fig B push the deflection yoke forwards until their positions are corrected 8 If the beam l...

Страница 13: ... CRT screen is accomplished in the following manner Convergence in Fig a insert wedge a between the deflection yoke and CRT and tilt the deflection yoke upward until the mis convergence shown in Fig a is corrected Convergence in Fig b Insert wedges b and c between the deflection yoke and CRT and tilt the defllection yoke until the mis convergence shown in Fig b is corrected Convergence in Fig c In...

Страница 14: ...it facing the east SIGN POSITION CONTROL RI 017 1 Set the channel number at 2 2 Display the channel sign by means of the channel call of remote control on the screen 3 Adjust the sign position by R1017 so that it is set 50 mm away from the CRT edge CRT edge 1 14 ...

Страница 15: ...ING TABLE NO RASTER Check F701 r 1 Blown out Check T701 pin 1 voltage Approx 290V DC at 220V AC r 1 I Check R701 and R702 1 Check B voltage Approx 1 PW I Approx OV Check D702 Normal Check CRT connector Kl K5 bias 15 ...

Страница 16: ... increases but no signal is received I Check the tuner BL BH Bu and B2 biases 62 must be approx IZV BL must be approx l2Vand BH must be approx 12V with the preset switch at VHF position Bu must be approx 12V with the band switch at UHF position IPicture noise decreases but sound level varies greatly IDoes the I2V B appear at pin 11 of connector Check the tuner AGC I Normal Abnormal 16 ...

Страница 17: ...ific colours are not produced in colour broadcast reception Is some colour produced in B W broadcast Yes Is the white balance properly Readjust the white balance I I The picture colour is red or cyan I I The picture colour is green or 1 The picture colour is blue or magenta yellow 17 ...

Страница 18: ...me colour produced in B W broadcast Yes I When change channel does colour appeared Colour appears but colour shading Yes No Colour appears but abnormal colour Check pins 22 23 and 27 of K801 bias I I I Check pins 18 20 and 21 of IC802 bias I 1 Check IC801 I Normal Check Q853 and its 18 ...

Страница 19: ...CIRCUITS TO BE CHECKED l IC801 and its adjacent circuit 0 R G B output circuit NO SPECIFIC COLOUR NTSC Specific colours are not produced in colour VCR NTSC4 43 reception 19 ...

Страница 20: ...D I UJ I A I u I m I n I 0 I I F70 l 53 150 r IR746 II 0740 PWB E b TUNING SWITCH ITFJlr 7 ITAI K2 IT61 0 0 TAI IRA1 a iDI FOCUS 1 1 SCREEN ICI401 1 Jl401 I I ...

Страница 21: ...PRINTED WIRING BOARD ASSEMBLIES PWM A Wiring Side PWM B Wiring Side 1 I 2 I 3 I 4 I 5 I 6 21 ...

Страница 22: ...PWB A Wiring Side I 7 I 8 9 I 10 11 12 22 ...

Страница 23: ...PRINTED WIRING BOARD ASSEMBLIES Continued R712 L703 R713 I I D7lO c71 I j PWBF6859PEZZ PWB E Wiring Side 23 ...

Страница 24: ...PWB C Wiring Side K6863WE j PWB F Wiring Side 902 903 904 905 906 PWB B Wiring Side I 7 8 9 10 11 I 12 I 24 ...

Страница 25: ...PRINTED WIRING BOARD ASSEMBLIES Continued IJ PWB D Wiring Side 1 I 2 I 3 I 4 I 5 I 6 1 25 ...

Страница 26: ...SINKS SHOULD BE REGARDED AS POTENTIAL SHOCK HAZARDS WHEN THE CHASSIS IS OPERATING SURE TO REPLACE THESE PARTS WITH SPECIFIED ONES FOR S E R V I C E P R E C A U T I O N The area enclosed by this line I is direct y 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 SOLID STATE DEVICE BASE DIAG...

Страница 27: ...IRCUIT s A 5 x ypz y i f v 5 o L SI INFRARED REMOTE CONTROLLER CIRCUIT RRMCG0756CESA r CAUTION This circuit diagram is original one therefore there may be a slight difference from yours 1 I 2 1 3 I 4 5 I 6 I 27 ...

Страница 28: ...u H J 1 8Vp p H 8 8Vp p H 2 ovp p V 1 2vp p V 5W3 p NJ T 1 ZVp p H 1 ZOVp p H 103OVp p H 12 8Vp p H 9 2Vp p H 0 0 44Vp p H 0 3Vp p H 2 6Vp p H 0 32Vp p H 0 88Vp p H 0 68Vp p H 8OVp p H 86Vp p H 84Vp p H 68OVp p AC 220V 2 8 ...

Страница 29: ...SCHEMATIC DIAGRAM SUB CIRCUIT 29 ...

Страница 30: ...I CAUTION This circuit diagram is original one therefore there may be a slight difference from yours I 3 0 ...

Страница 31: ...SCHEMATIC DIAGRAM MAIN CIRCUIT ...

Страница 32: ...I CAUTION This circuit diagram is original one therefore there may be a slight difference from yours I I 7 I 8 9 1 10 I 11 I 12 I 3 2 ...

Страница 33: ...BLOCK DIAGRAM MAIN CIRCUIT 1 1 2 I 3 4 I 5 I 6 3 3 ...

Страница 34: ...1 7 8 9 I 10 11 I 12 I 34 ...

Страница 35: ...BLOCK DIAGRAM SUB CIRCUIT ADG COIL 7 1 2 1 3 4 I 5 I 6 I 35 ...

Страница 36: ...7 I 8 9 10 11 12 36 ...

Страница 37: ... PWB A DUNTK6860WEVO M o t h e r U n i t PWB B DUNTK6861 WEVO C o n t r o l U n i t PWB C DUNTK6281WEW7 CRTSocket U n i t PWB D DUNTK6862WEVO AV S Output U n i t PWB E DUNTK6859WEVO Powe U n i t PWB F DUNTK6863WEVO R C Receiver LED Unit PWM A DUNTK6374WEVZ S Converter Unit PWM B DUNTK6373WEV3 I F U n i t I Ref No I Part No I I Description I I Code PWB A DUNTK6860WEVO MOTHER UNIT TUNER NOTE THE PAR...

Страница 38: ...DXOO55TAZZ J 1S1888 AD D601 RH EXOZOOCEZZ J Zener Diode RDl2E AB 805 806 807 D602 RH EX0379GEZZ J Zener Diode HZS6 AA D603 RH EX0380GEZZ J Zener Diode HZS7 AA D605 RH DXO127CEZZ J S5295G AC D607 RH DX0073CEZZ J RH17 AD D608 RH DXOl 1 OCEZZ J S5277G A0 611 D612 RH EX005 1 CEZZ J Zener Diode RD22E AB D812 RH EXOO24CEZZ J ZenerDiode RD6 2E AB 813 1002 1003 1004 1005 1006 1007 1008 1010 1011 1012 1040...

Страница 39: ...k B S C o n t r a s t AB R503 RVR B5270CEZZ J ZOOk B VerticalSize AB R602 RVR B5257CEZZ J 100 B Horiz Center AB R802 RVR B5266CEZZ J 20k B Sub Colour AB R806 RVR B5261 CEZZ J lk B DL Amp AB C207 c211 418 831 c407 c440 801 1034 C502 c503 C512 c515 815 C516 835 C521 C607 821 C608 C610 622 624 627 C611 C613 614 C616 C618 620 C623 C625 C629 C630 C633 C836 Cl 020 1023 CAPACITORS VCSATAlCE475K J 4 7 16V...

Страница 40: ...401 QSW B0015CEZZ J Service AC 501 Vertical Center MISCELLANEOUS PARTS FB601 RBLN 0037CEZZ J FerriteBead A0 602 1001 PWB B DUNTK6861 WEVO CONTROL UNIT DIODES D1049 VHDlSSl 19 1E J lSS119 AA 1051 1053 CONTROL A R459 RVR 00075PEZZ R lOk B PictureTone AF SWITCHES AS1020 QSW K0068CEZZ J S o u n d U p A0 A 1021 Sound Down l 1022 ChannelUp A 1023 Channel Down A 1030 P Control A 1031 P Control Level Up A...

Страница 41: ...1403 1406 1407 1408 41324 VSZSCl81 SYW 1 J 2SC1815 Y AC 1327 41409 VS2SC3399 1 J 2SC3399 AB DIODES D1321 VHDlSSl 19 1E J lSS119 AA 1322 1323 1325 1330 1401 1402 1403 1404 1405 1406 COILS L1401 VP DF330KOOOO J 33pH AB L1402 VP DFl SOKOOOO J 15vH AB L1403 VP DF8R2KOOOO J 8 2pH AB CF1401 RFiLCOOl 3CEZZ J 4 5MHzTrap AE CF1402 RFiLC0024CEZZ J 6 5MHzTrap AE CAPACITORS C1329 VCEAGAlCW477M J 470 16V E l e...

Страница 42: ...RC FZOOI 8CEZZ J 0 22 AC250V AH Metallized Polyester A C702 RC KZOO29CEZZ J 0 01 AC250V Ceramic AC A 703 A 704 A 705 A 707 A 711 AC710 VCKYPA2HB152K J 0 0015 5OOV C e r a m i c A A AC712 RC EZO191 CEZZ J 330 400VElectrolytic A S AC713 VCQPSCZJA333K J 0 033 630VMylar AB nc714 VCKYPH3DB561K J 560p2kV C e r a m i c A C A 715 A 716 AC71 7 RC KZ0033CEZZ J 150 2kV Ceramic AB AC718 VCEAAAlJN476M J 47 63V...

Страница 43: ...Fuse Resistor AB VRS SV3LB123J J 12k 3W MetalOxide AB VRS SV3LB103J J 10k 3W MetalOxide A6 VRW KP3HC8RZK J 8 2 SW C e m e n t A C RR XZOOl 7CEZZ J 10 1 2W FuseResistor AB VRW KP3NC6R8K J 6 8 7W C e m e n t A C VRD RAZEE331 J J 330 1 4W Carbon M VRD RAZHD223G J 22k 1 2W C a r b o n M VRS VV3DB822J J 8 2k2W MetalOxide M VRD RMZHD122J J 1 2k 1 2W Carbon M VRD RAZEElOZJ J lk 1 4WCarbon M VRD RAZEE222J...

Страница 44: ...003PEZZ R ACCord AQ 1 PACKING PARTS NOTREPLACEMENTITEM SPAKC5526PEZZ PackingCase SPAKXO24OPEZZ BufferMaterial SPAKPOOSSPEZZ PolystyreneMat CABINET PARTS LOCATION VSP9050PB278A R Speaker 2used Aw SUPPLIED ACCESSORIES CABINET PARTS ACCESSORIES RRMCG0756CESA R Infrared Remote Controller BA ACCESSORIES OTREPLACHW ITEM UBATUl032CCN 1 Dry Battery Size AAA 2 PCS TiNS 4427PEZZ OperationManual TMAPC3727PEZ...

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