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Sharp 21FL91 Service Manual
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Sharp 21FL91 Service Manual

Sharp 21FL91 Service Manual

Chassis no. ga-2
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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.
» ELECTRICAL SPECIFICATIONS ......................................................................................................... 1
» IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................. 2
» LOCATION OF USER'S CONTROL ..................................................................................................... 4
» INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................ 5
» SERVICE MODE .................................................................................................................................. 6
» ADJUSTMENT METHOD ................................................................................................................... 11
» CHASSIS LAYOUT ............................................................................................................................. 26
» BLOCK DIAGRAM .............................................................................................................................. 27
» SCHEMATIC DIAGRAMS ................................................................................................................... 33
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 38
» REPLACEMENT PARTS LIST ............................................................................................................ 42
» PACKING OF THE SET ...................................................................................................................... 48
POWER INPUT ....................................... AC 110~220 V, 50/60 Hz
POWER RATING .................................................................... 95W
PICTURE SIZE .......................................... 1,239 cm
CONVERGENCE ............................................................. Magnetic
SWEEP DEFLECTION .................................................... Magnetic
FOCUS ............................................... Hi-Bi-Potential Electrostatic
INTERMEDIATE FREQUENCIES
Picture IF Carrier Frequency ..................................... 45.75 MHz
Sound IF Carrier Frequency ...................................... 41.25 MHz
Color Sub-Carrier Frequency .................................... 42.17 MHz
AUDIO POWER
OUTPUT RATING ........................................ 3.0 W(RMS) x 2pcs

SHARP CORPORATION

SERVICE MANUAL

MODEL
ELECTRICAL SPECIFICATIONS
SPEAKER
SIZE ................................................................... 12 x 5 cm, 2pcs
2
(192sq inch)
VOICE COIL IMPEDANCE ............................. 16 ohm at 400 Hz
ANTENNA INPUT IMPEDANCE
VHF/UHF ..................................................... 75 ohm Unbalanced
TUNING RANGES
VHF-Channels ............................................................... 2 thru 13
UHF-Channels ............................................................ 14 thru 69
CATV Channels ........................................................... 1 thru 125
(Nominal)
Specifications are subject to change without
prior notice.
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
COLOR TELEVISION
Chassis No. GA-2
21FL91
(EIA, Channel Plan U.S.A.)
21FL91
SX2U321FL91//
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Summary of Contents for Sharp 21FL91

  • Page 1: Table Of Contents

    21FL91 SERVICE MANUAL SX2U321FL91// COLOR TELEVISION Chassis No. GA-2 21FL91 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 Safety Precaution

    21FL91 IMPORTANT SERVICE SAFETY PRECAUTION Ë Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and the servicing guidelines which follow: WARNING X-RADIATION AND HIGH VOLTAGE LIMITS 1. For continued safety, no modification of any circuit 1.

  • Page 3: Safety Notice

    21FL91 IMPORTANT SERVICE SAFETY PRECAUTION (Continued) BEFORE RETURNING THE RECEIVER Connect the resistor connection to all exposed metal parts having a return to the chassis (antenna, metal (Fire & Shock Hazard) cabinet, screw heads, knobs and control shafts, escutcheon, etc.) and measure the AC voltage drop Before returning the receiver to the user, perform across the resistor.

  • Page 4: Location Of User's Control

    21FL91 LOCATION OF USER'S CONTROL...

  • Page 5: Installation And Service Instructions

    21FL91 INSTALLATION AND SERVICE INSTRUCTIONS Note: (1) When performing any adjustments to resistor controls and transformers use non-metallic screwdrivers or TV alignment tools. (2) Before performing adjustments, the TV set must be on at least 15 minutes. CIRCUIT PROTECTION HIGH VOLTAGE CHECK The receiver is protected by a 3.15A fuse (F701),...

  • Page 6: Service Mode

    21FL91 SERVICE MODE Service Mode Overview 1. Service mode is entered by SERVICE key input or CH-UP +VOL-DOWN input during reset. 2. Service mode is cleared by entering SERVICE key command during service mode. 3. If key input port (SERVICE) input is LOW, then it is in service mode.
  • Page 7 21FL91 Adjustment Mode Items Item Name Register Range Default SUB-PICTURE 1 Chip CONTRAST 0~127 SUB-TINT 1 Chip TINT 0~127 SUB-COLOR 1 Chip COLOR 0~127 SUB-BRIGHT 1 Chip BRIGHT 0~255 SUB-SHARP 1 Chip VIDEO-TONE 0~63 V-SHIFT 1 Chip V-SHIFT H-SHIFT 1 Chip...

  • Page 8: Self Adjustment

    21FL91 Ë SELF ADJUSTMENT H-VCO 1. When there is H-VCO self-adjustment key input for adjustment item H-VCO, self-adjustment is performed. 2. H-FREE(1chip) is set to 1. 3. H-OUT is set by intelligent monitor output. 4. IM input is set as TIM input.
  • Page 9 21FL91 Setting Mode Items Item Name Register Range Default VideoTone-Gain (TV) 1chip V-TONE 0 / 1 VideoTone-Gain (AV) 1chip V-TONE 0 / 1 VideoTone-Gain(YUV) 1chip V-TONE 0 / 1 ABCL 1chip ABCL 0 / 1 1chip BS-OFF 0 / 1...

  • Page 10: Speaker

    21FL91 Option Mode Items ITEM DEFAULT DEM0 Without DEMO With DEMO DOWNLOAD Without V-CHIP OP With V-CHIP OP V-CHIP Without V-CHIP With V-CHIP SPEAKER Without SPEAKER With SPEAKER Without FAO With FAO P.PREF Without P.PREF With P.PREF UNIV+ Without UNIV+...

  • Page 11: Adjustment Method

    21FL91 ADJUSTMENT METHOD Caution: to get into the service mode, one of the ways is press direct key for service items. the other ways is short the main chassis JA309 and JA402 There is three stage of Service Mode data...
  • Page 12 21FL91 Second Stage Data Service Mode Function Range Default Data VIDEO TONE -GAIN (TV) V-TONE VIDEO TONE -GAIN (AV V-TONE VIDEO TONE -GAIN(YUV) V-TONE ABCL ABCL BS-OFF ABCL-G ABCL-G SHP-AV VIDEO-TONE(OFFSET) -16~+16 SHP-YUV VIDEO-TONE(OFFSET) -16~+16 SHP-CLIP EXTRGB-CLIP E-SAVE CONTRAST(OFFSET) 0~63...
  • Page 13 21FL91 Third Stage Data Service Mode DATA="0" DATA="1" Default Data DEMO DEMO DISABLE DOWNLOAD V-CHIP OP DISABLE V-CHIP V-CHIP DISABLE SPEAKER SPEAKER DISABLE FAO DISABLE P.PREF P.REF DISABLE UNIV+ UNIV+ DISABLE VIEW TIMER VIEW TIMER DISABLE EZ-SETUP EZ-SETUP AUTO PRESET...
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  • Page 25 21FL91 - M E M O -...

  • Page 26: Chassis Layout

    21FL91 CHASSIS LAYOUT...

  • Page 27: Block Diagram

    21FL91 CRT BLOCK DIAGRAM...
  • Page 28 21FL91 21FL91 MAIN BLOCK DIAGRAM 28~29...
  • Page 29 21FL91 21FL91 MTS BLOCK DIAGRAM 30~31...

  • Page 30: Description Of Schematic Diagram

    21FL91 DESCRIPTION OF SCHEMATIC DIAGRAM WAVEFORM MEASUREMENT CONDITIONS: NOTES: Photographs taken on a standard gated color bar 1. The unit of resistance "ohm" is omitted. signal, the tint setting adjusted for proper color. The (K=k =1000 , M=M ) wave shapes at the red, green and blue cathodes of 2.
  • Page 31 21FL91 SCHEMATIC DIAGRAM: CRT Unit...
  • Page 32 21FL91 21FL91 SCHEMATIC DIAGRAM: MAIN Unit 34~35...
  • Page 33 21FL91 21FL91 SCHEMATIC DIAGRAM: MTS MODULE Unit 36~37...

  • Page 34: Printed Wiring Board Assemblies

    21FL91 PRINTED WIRING BOARD ASSEMBLIES PWB-A: MAIN Unit (Wiring Side)
  • Page 35 21FL91 RJ 4 0 R1 0 2 6 R1 0 0 8 R3 8 4 R1 0 0 7 R1 0 0 9 R1 0 0 2 R3 8 3 RJ 1 6 RJ 4 8 R1 0 2 7...
  • Page 36 21FL91 PWB-B: CRT Unit (Wiring Side)
  • Page 37 21FL91 PWB-E: MTS MODULE Unit (Wiring Side) R3 0 8 1 Q3 0 0 7 R3 0 0 5 C3 0 0 8 C3 0 8 2 R3 0 3 6 RJ 7 RJ 2 Q3 0 0 6 RJ 6...

  • Page 38: Replacement Parts List

    21FL91 Ref. No. Part No. Description Code Ref. No. Part No. Description Code REPLACEMENT PARTS LIST å Q701 VSSTP6NC80Z1E X STP6NC80Z PARTS REPLACEMENT Q703 VS2SC3198-Y-1+ X 2SC3198-Y Q740 VS2SD601AR/-1~ X 2SD601AR Replacement parts which have these special safety characteristics Q741...
  • Page 39 21FL91 Ref. No. Part No. Description Code Ref. No. Part No. Description Code L204 VP-XF1R2K0000~ X Peaking, 1.2 H 10% C643 VCEA0A1CW477M+ X 470 16V Electrolytic L602 RCiLP0223CEZZ X Coil, CiLP0223CE C650 VCKYPA2HB101K+ X 100p 500V Ceramic å C701 L603...
  • Page 40 21FL91 Ref. No. Part No. Description Code Ref. No. Part No. Description Code C1009 VCKYCY1HF103Z~ X 0.01 50V Ceramic R362 VRS-CY1JF332J~ X 3.3k 1/16W Metal Oxide C1011 VCKYCY1HB221K~ X 220p 50V Ceramic R363 VRS-CY1JF564J~ X 560k 1/16W Metal Oxide C1012...
  • Page 41 21FL91 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R754 VRN-RL3DB8R2J+ X 8.2 Metal Film R1063 VRS-CY1JF103J~ X 10k 1/16W Metal Oxide R755 VRS-RG3DB150J+ X 15 Metal Oxide R1064 VRS-CY1JF103J~ X 10k 1/16W Metal Oxide R756...
  • Page 42 21FL91 Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA599WEA0 C3006 VCEA0A1CW106M+ X 10 16V Electrolytic PWB-B CRT UNIT C3007 VCEA0A1HW475M+ X 4.7 50V Electrolytic C3008 VCKYCY1HF103Z~ X 0.01 50V Ceramic C3009 VCEA0A1CW227M+ X 220 16V Electrolytic...
  • Page 43 - Model Label TLABZA153WJZZ - POP Label CABINET PARTS CCABAA146WEH0 X Front Cabinet Ass'y Not Avairable - Front Cabinet — HBDGB3155CESA X SHARP Badge HDECQ119WJSA R/C Cover JBTN-A070WJSA X Button, Power MSPRC0005PEFW X Spring, for Power Button GDORFA015WJSA X Door MSPRPA012WJFW...

  • Page 44: Packing Of The Set

    21FL91 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PACKING OF THE SET...
  • Page 45 21FL91 Ref. No. Part No. Description Code Ref. No. Part No. Description Code - M E M O -...
  • Page 46 Code Ref. No. Part No. Description Code COPYRIGHT © 2002 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.

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