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Sharp 21N52-E1 Service Manual

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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.
Power Input ................................
Power Consumption .................................
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 .....................................
SECAM ............................
NTSC ............................................
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.
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.

SERVICE MANUAL

MODEL
ELECTRICAL SPECIFICATIONS
110-240VAC
50/60Hz (Auto)
107w
34.47M Hz
34.494/34.65MHz
35.32MHz
WARNING
SHARP CORPORATION
21 SYSTEM

COLOUR TELEVISION

Chassis No. 2IA- M
21N52-E1
Aerial Input Impedance ,......, 75 ohm Unbalanced
Receiving Channels
PAL-B/G, SECAM-B/G
VHF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
UHF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 thru 69
CATV .......................,...............
PAL-D/K, SECAM-D/K
VHF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . R1 thru R12
UHF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 thru 69
PAL-l
VHF . . . . . . . . . . . . . . . . . . . . . (IRELAND):
UHF .................. (U.K., H.K.): 21 thru 69
NTSC-M
VHF . . . . . . . . . . . . . . . . . . . . . . . . . . . (US):
UHF . . . . . . . . . . . . . . . . . . . . . . . . . . . (US): 14 thru 83
CATV .................................... A-6 thru A-1,
Receiving Frequency
VHF . . . . . . . . . . . . . . . . . . . . . . . . .
UHF . . . . . . . . . . . . . . . . . . . . . . . . .
serviceable parts inside. Refer servicing to
E2 thru E l 2
S1 thru S3,
M1 thru M10
U1 thru U10
B thru J
2 thru 13
(JAPAN):
1 thru 12
(JAPAN): 13 thru 62
A thru W,
AA
48.25 thru 301.25 MHz
471.25 thru 885.25 MHz

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Summary of Contents for Sharp 21N52-E1

  • Page 1: Service Manual

    21 SYSTEM COLOUR TELEVISION Chassis No. 2IA- M 21N52-E1 MODEL 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.

  • Page 2: Important Service Notes

    CONTENTS Page Page PRINTED WIRING BOARD ASSEMBLIES ..21 SCHEMATIC DIAGRAMS IMPORTANT SERVICE NOTES ......2 SERVICE ADJUSTMENT ......... 3 AND WAVEFORMS ............REPLACEMENT PARTS LIST ......37 IMPORTANT SERVICE NOTES Maintenance and re air of this receiver should be done by qualified service personnel on r SERVICING OF HIGH VOLTAGE SYSTEM AND PICTURE TUBE remove static charge from it by...

  • Page 3: Service Adjustment

    SERVICE ADJUSTMENT TUNER IFT COILS The tuner has been factory preset (no Apply DC 4.5V to pin (1) of IC1201 (in IF unit). adjustment is needed). RF AGC: Set Vr voltage at 5V in VH band. Apply DC 4.OV (about, -2OdB) to the tuner Connect sweep generator’s output to the test point of tuner, by using a 7552 DC cut probe.
  • Page 4 (Continued) AFT COIL ROUOGH ADJUSTMENT: T1201 base line. of IF unit. Probe in use: Sweep output level: Connection Diagram of 75Q DC Cut Probe. Apply 4.5V DC (PIF AGC) to TP1203 (pin (1) of Connect response lead to pin (1) of IF unit. (The response lead should be a direct probe with a 1 Ok ohm resistor included.) Tune off AFT Mute.
  • Page 5 (Continued) waveform is of approx. lVp-p. point of tuner. Probe in use: Figure below. Sweep output level: Connect response lead to TP401. The response lead in use should be a direct probe with a resistor of 1 Ok ohms included. RF AGC: Apply approx.
  • Page 6 (Continued) SOUND DETECTOR COIL: T1301 This coil (in IF unit) has been factory preset (no adjustment is basically Have pin (4) of IF unit grounded, and read the needed). value then available on the voltmeter (VTVM). It should be approx. 4.5V. The probe in use should be a 75Q DC cut Remove the grounding at pin (4) of IF unit.

  • Page 7: Video Circuit Adjustment

    VIDEO CIRCUIT ADJUSTMENT CRT CUT-OFF ADJUSTMENT blanking pulse level of 10 + lVp-p at TP852. Screen control (a part of T602) Prior to this adjustment, warm up the unit with the beam current of more than 700uA for more than 30 minutes. pattern generator.

  • Page 8: Pal Chroma Adjustment

    PAL CHROMA ADJUSTMENT 1 H-delay amp. control . T801: 1 H-delay phase control Note: PIFIAFTIAGC adjustments should have been completed before starting this adjustment. 3 and 4 of the connector (K), to which an Figure a. Waveform before the adjustment Resistance Matrix position to cut-off the Y-signal.
  • Page 9 BELL FILTER ADJUSTMENT: T903 I. Receive “SECAM COLOUR BAR” signal with following settings. Voltage Range: 0.05 Wdiv., AC Sweep Time: Probe: I/I 0 (3OpF, I OMQ or more) Blue portions of the colour bar signal should have the same amplitude. I.
  • Page 10 SUB-HUE: R835 I. Receive “NTSC COLOUR BAR” signal with 2. Connect the oscilloscope to TP853 (B-Y). 3. Turn on the “N” key on the remote controller. Same level y 4. Set service switch 5401 at the Video Cut position to cut-off the Y-signal. 5.

  • Page 11: Focus Adjustment

    ADJUSTMENT OF DEFLECTION LOOP facing Note; During the adjustment, keep the unit the east. FOCUS ADJUSTMENT CENTER position. central area of CRT. Adjust point HORIZONTAL CENTERING CONTROL: R602 This adjustment should be performed after the purity convergence adjustments. picture is at the position which gives the relation of A = B .

  • Page 12: Purity Adjustment

    PURITY ADJUSTMENT N o t e : D u r i n g t h e a d j u s t m e n t , k e e p t h e u n i t f a c i n g t h e e a s t . PURITY ADJUSTMENT unit with beam current of more than 700 for rnore than 30 minutes.

  • Page 13: Convergence Adjustment

    CONVERGENCE ADJUSTMENT N o t e : D u r i n g t h e a d j u s t m e n t , k e e p t h e u n i t f a c i n g t h e e a s t . CONVERGENCE ADJUSTMENT This adjustment should be performed Wedge “a”...
  • Page 14 CRT DISPLAY ADJUSTMENT Note; During the adjustment, keep the unit facing the east. SIGN POSITION CONTROL: RI 017 CRT edge channel call of remote control on the screen. set 50 mm away from the CRT edge.

  • Page 15: Troubleshooting Table

    TROUBLE SHOOTING TABLE NO RASTER Blown out. Check F701. Check T701 pin (1) voltage AC). Check + B voltage Check CRT connector Check D702. Normal...

  • Page 16: No Picture, No Sound

    CIRCUITS TO BE CHECKED: NO PICTURE, NO SOUND Tuner. . PIF. Automatic Gain Control. Does the noise level increqse at max. Contrast, Brightness and Sound controls? Noise increases but no signal is Picture noise decreases but sound received. level varies greatly. Check the tuner BL, BH, Bu and Does the I2V +B appear at pin + B2 biases.
  • Page 17 CIRCUITS TO BE CHECKED: circuit. Specific colours are not produced in colour broadcast reception. Is some colour produced in B/W broadcast Is the white balance properly Readjust the white balance. I 1 ’ The picture colour is red or The picture colour is green or The picture colour is blue or magenta.
  • Page 18 CIRCUITS TO BE CHECKED: circuit. Is some colour produced in B/W broadcast When change channel does shading. Check pins (22), (23) and (27) of K801 bias. Normal Check pins (18), (20) and (21) of Check Q853 and its...
  • Page 19 CIRCUITS TO BE CHECKED: NO SPECIFIC COLOUR (NTSC) circuit. Specific colours are not produced in colour VCR NTSC4.43 reception.
  • Page 20 TUNING SWITCH SCREEN...

  • Page 21: Printed Wiring Board Assemblies

    PRINTED WIRING BOARD ASSEMBLIES...
  • Page 23 PRINTED WIRING BOARD ASSEMBLIES (Continued)
  • Page 25 PRINTED WIRING BOARD ASSEMBLIES (Continued)

  • Page 26: Description Of Schematic Diagram

    DESCRIPTION OF SCHEMATIC DIAGRAM NOTE: S A F E T Y N O T E : POTENTIAL SHOCK HAZARDS WHEN THE CHASSIS IS OPERATING. VOLTAGE MEASUREMENT CONDITIONS: or Color Signal. SURE TO REPLACE THESE PARTS WITH SPECIFIED ONES FOR with no signal. S E R V I C E P R E C A U T I O N : voltmeter.
  • Page 27 ....................

  • Page 28: Wave Forms

    WAVE FORMS...

  • Page 29: Schematic Diagram

    SCHEMATIC DIAGRAM: SUB CIRCUIT...
  • Page 30 CAUTION: This circuit diagram is original one, therefore there may be a slight difference from yours.

  • Page 31: Main Circuit

    SCHEMATIC DIAGRAM: MAIN CIRCUIT...
  • Page 32 CAUTION: This circuit diagram is original one, therefore there may be a slight difference from yours.

  • Page 33: Block Diagram

    BLOCK DIAGRAM: MAIN CIRCUIT...
  • Page 35 BLOCK DIAGRAM: SUB CIRCUIT...

  • Page 37: Parts List

    Ref. No. Part No. Description Code PARTS LIST PARTS REPLACEMENT MOTHER UNIT Replacement parts which have these special safety characteristics TUNER identified in this manual: electrical components having such NOTE: THE PARTS HERESHOWNARESUPPUEDASAN features are identified by A in the Replacement Parts Lists. ASSEMBLY BUT NOT INDEPENDENTLY.
  • Page 38 Part No. Description Code Ref. No. Description Code Part No. Ref. No. DIODES (Continued) MOTHER UNIT (Continued) TRANSISTORS (Continued) J Zener D i o d e , RDl2E DIODES J lSS119 PACKAGED Cl RCU ITS J Resistor Array COILS...
  • Page 39 Description Description Code Ref. No. Code Part No. Ref. No. CONTROLS MOTHER UNIT (Continued) COILS (Continued) Vertical Linearity, Sub-Hue J 1uH CAPACITORS J 1pH J 100pH CERAMIC FILTERS J 470 35V E l e c t r o l y t i c A D J 470 16V E l e c t r o l y t i c A C DELAY LINES TRANSFORMERS...
  • Page 40 Code Ref. No. Description Description Code Ref. No. Part No. MOTHER UNIT (Continued) CONTROL UNIT RESISTORS DIODES J 47 1/4W FuseResistor A0 J 22 1/4W J 39 1/2W Fuse Resistor A0 CONTROL R 3.9 15W C e m e n t J 2.2 1/2W Fuse Resistor AB J 1 k 1/2W Metal Oxide AA J 3.3 1/2W FuseResistor A0...
  • Page 41 Description Code Description Code Ref. No. Part No. Ref. No. Part No. DIODES J lSS119 CRT SOCKET UNIT (Continued) CAPACITORS RESISTORS J 2.7k l/ZWSold COILS J 15vH MISCELLANEOUS PART CERAMIC FILTERS J 4.5MHzTrap CAPACITORS , J 470 16V E l e c t r o l y t i c A C INTEGRATED CIRCUITS S o u n d O u t p u t ( Sound Output(L)
  • Page 42 Description Code Ref. No. Part No. Description Code Ref. No. TRANSFORMER R RegulatorTransformer POWER UNIT INTEGRATED CIRCUITS CAPACITORS J PowerRegulator TRANSISTORS J 0.0015 5OOV C e r a m i c A A DIODES J 0.033 630VMylar J 3.3 5OV E l e c t r o l y t i c AE PACKAGED CIRCUIT COILS...
  • Page 43 Ref. No. Description Part No. Code Ref. No. Part No. Description Code MISCELLANEOUS PART POWER UNIT (Continued) RESISTORS J 47 ll2W Fuse Resistor AB J 39k 1/2W Carbon J 15k 1/4W Carbon DIODE J 33 1/2W C a r b o n J 330 1W M e t a l O x i d e AA J 180 1/2W Carbon J 47 1/2W C a r b o n...

  • Page 44: Packing Parts

    Ref. No. Part No. Description. Code Part No. Description Code Ref. No. PACKING PARTS IF UNIT INTEGRATED CIRCUIT TRANSISTORS DIODE CABINET PARTS LOCATION TRANSFORMERS CERAMIC FILTERS CAPACITORS MISCELLANEOUS PARTS R Speaker(2used) CABINET PARTS SUPPLIED ACCESSORIES ACCESSORIES Not Available Controller ACCESSORIES (/~OTREPLACHW~~~ITEM) R W i n d o w H DECA0006PESA R Speaker Decoration (R) AG...

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