Sharp 20MU11 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.

» ELECTRICAL SPECIFICATIONS ......................................................................................................... 1

» IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................. 2

» LOCATION OF USER'S CONTROL ..................................................................................................... 6

» INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................ 7

» CHASSIS LAYOUT ............................................................................................................................ 12

» BLOCK DIAGRAM ............................................................................................................................. 13

» SCHEMATIC DIAGRAMS .................................................................................................................. 14

» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 18

» REPLACEMENT PARTS LIST ........................................................................................................... 23

» PACKING OF THE SET ..................................................................................................................... 35

POWER INPUT ................................ 120 V AC 60 Hz

POWER RATING ............................................. 82 W

PICTURE SIZE ....................... 1,194cm

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

SHARP CORPORATION

SERVICE MANUAL

COLOR TELEVISION

MODELS

CONTENTS

ELECTRICAL SPECIFICATIONS

AUDIO POWER

OUTPUT RATING ........... 0.9 W (at 10% distortion)

SPEAKER

(185sq inch)

SIZE .................................................. 8 cm (Round)

VOICE COIL IMPEDANCE ........... 8 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.

Chassis No. SN-80

20MU11

(EIA, Channel Plan U.S.A.)

20MU11

Page

Table of Contents

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Questions and answers

Don edwards

March 27, 2025

What part needs to change when tv shuts down immediately after power on.

1 comments:

Mr. Anderson

March 27, 2025

If the Sharp TV model 20MU11 shuts down immediately after power on, the issue could be related to the X-Radiation protection circuit. The manual suggests checking the voltage at TP653 and applying external 28.9V DC to see if the TV shuts off. If this happens, the protection circuit is active, and a malfunctioning component in this circuit may need replacement.

To reset the protector, unplug the AC cord and short TP651 and TP652. If the issue persists, inspect and replace faulty components in the protection circuit, ensuring that replacement parts match the original specifications for safety.

This answer is automatically generated

Summary of Contents for Sharp 20MU11

Page 1: Table Of Contents
20MU11 SERVICE MANUAL COLOR TELEVISION Chassis No. SN-80 20MU11 MODELS 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
20MU11 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
20MU11 IMPORTANT SERVICE SAFETY PRECAUTION (Continued) » Connect the resistor connection to all exposed metal BEFORE RETURNING THE RECEIVER parts having a return to the chassis (antenna, metal (Fire & Shock Hazard) cabinet, screw heads, knobs and control shafts, escutcheon and etc.) and measure the AC voltage Before returning the receiver to the user, perform drop across the resistor.
Page 4: Location Of User's Control
20MU11 LOCATION OF USER'S CONTROL...
Page 5: Installation And Service Instructions
20MU11 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. HIGH VOLTAGE CHECK CIRCUIT PROTECTION The receiver is protected by a 4.0A fuse (F701),...
Page 6 20MU11 For adjustments of this model, the bus data is converted to various analog signals by the D/A converter circuit. Note: There are still a few analog adjustments in this series such as focus and master screen voltage. Follow the steps below whenever the service adjustment is required. See "Table-B" to determine, if serv- ice adjustments are required.
Page 7 20MU11 DATA SERVICE ADJUSTMENT ITEM ADJUSTMENT CONTENTS NUMBER RANGE INITIAL VALUE PICTURE 00-7F TINT 00-7F COLOR 00-7F BRIGHTNESS 00-7F SHARPNESS 00-3F Must be set to "24" VERTICAL PHASE 00-07 Must be set to "00" ~ "03" HORIZONTAL PHASE 00-1F RF-AGC...
Page 8: Service Adjustment
20MU11 Ë SERVICE ADJUSTMENT VCO Adjustment White Balance Adjustment 1. Connect a digital voltmeter between pin (44) of IC201 1. Receive a good local channel. and ground. 2. Enter the service mode and select the service 2. Receive a good local channel.
Page 9 20MU11 Sub-Brightness Adjustment 3.58MHz Trap Adjustment 1. Receive a good local channel. 1. Receive a good local channel. 2. Make sure the customer brightness control is set to 2. Enter the service mode and select the service center position. adjustment "S16".
Page 10: Chassis Layout
20MU11 CHASSIS LAYOUT Ë 20MU11 PWB-B PWB-B PWB-A...
Page 11: Block Diagram
20MU11 BLOCK DIAGRAM...
Page 12: Schematic Diagrams
20MU11 DESCRIPTION OF SCHEMATIC DIAGRAM WAVEFORM MEASUREMENT CONDITIONS: NOTES: 1. Photographs taken on a standard gated color bar 1. The unit of resistance "ohm" is omitted. (K=k Ω =1000 Ω , M=M Ω ) signal, the tint setting adjusted for proper color. The wave shapes at the red, green and blue cathodes of 2.
Page 13 20MU11 SCHEMATIC DIAGRAM: CRT UNIT (DUNTK9533WEV4) (DUNTK9530WEW6)
Page 14 20MU11...
Page 15 20MU11...
Page 16 20MU11...
Page 17 20MU11...
Page 18: Printed Wiring Board Assemblies
20MU11 PRINTED WIRING BOARD ASSEMBLIES Ë 20MU11 (DUNTK9529WEX7) PWB-A: MAIN Unit (Wiring Side)
Page 19 20MU11 PWB-A: MAIN Unit (Chip Parts Side)
Page 20 20MU11 PRINTED WIRING BOARD ASSEMBLIES Ë 20MU11 DUNTK9532WEX0 PWB-A: MAIN Unit (Wiring Side)
Page 21 20MU11 PWB-A: MAIN Unit (Chip Parts Side)
Page 22 20MU11 Ë 20MU11 PWB-B: DUNTK9530WEW6 PWB-B: CRT Unit (Wiring Side) PWB-B: CRT Unit (Chip Parts Side) Ë 20MU11 PWB-B: DUNTK9533WEV4 PWB-B: CRT Unit (Wiring Side) PWB-B: CRT Unit (Chip Parts Side)
Page 23: Replacement Parts List
2. REF. NO. 3. PART NO. 4. DESCRIPTION in USA: Contact your nearest SHARP Parts Distributor to order. For location of SHARP Parts Distributor, Please call Toll- Free; 1-800-BE-SHARP MARK : SPARE PARTS-DELIVERY SECTION MARK : X- RAY RELATED PARTS Ref. No.
Page 24 20MU11 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTK9529WEX7 (20MU11) D2001 VHD1SS119//-1 J Diode MAIN UNIT (Continued) PACKAGED CIRCUITS PR701 RMPTP0092CEZZ å J Packaged Circuit Q603 VS2SC945AQ/-1+ J 2SC945 RCRSAA010WJZZ J Crystal X801 Q752...
Page 25 Ref. No. Part No. Description Code Ref. No. Part No. Description Code VCQYTA1HM104J+ J 0.1 C757 Mylar PWB-A: DUNTK9529WEX7 (20MU11) C758 VCEA0A2EW106M+J 10 250V EL. å MAIN UNIT (Continued) C760 VCEA0A1CW108M+J 1000 16V VCQYTA1HM223J+ J 0.022 50V C801 Mylar VCEA0A1HW474M+J 0.47...
Page 26 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R634 VRD-RM2HD121J J 120 1/2W Carbon PWB-A: DUNTK9529WEX7 (20MU11) R641 VRS-VV3AB682J J 6.8k 1W M-Ox. å MAIN UNIT (Continued) R642 VRD-RA2BE821J J 820 1/8W Carbon R651 VRD-RM2HD1R0J J 1.0...
Page 27 Ref. No. Part No. Description Code Ref. No. Part No. Description Code HM718 LX-GZ3001PEZZ R Screw PWB-A: DUNTK9529WEX7 (20MU11) HM719 LX-GZ3001PEZZ R Screw MAIN UNIT (Continued) HM720 LX-GZ3001PEZZ R Screw HM722 LX-GZ3002PEZZ R Screw R2064 VRD-RA2BE332J J 3.3k 1/8W Carbon...
Page 28: Main Unit
20MU11 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A : DUNTK9532WEX0 (20MU11) D502 RH-DX0131CEZZ J Diode å MAIN UNIT D601 RH-DX0441CEZZ J Diode D603 RH-DX0441CEZZ J Diode TUNER NOTE: THE PARTS HERE SHOWN ARE SUPPLIED AS AN...
Page 29 20MU11 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A : DUNTK9532WEX0 (20MU11) C451 RC-QZA563TAYK J 0.056 50V Mylar C454 VCEA0A1HW475M J 4.7 C502 VCEA0A1EW477M J 470 MAIN UNIT (Continued) C504 VCKYPA2HB391K J 390p 500V Ceramic C505 VCQYTA1HM473K J 0.047 50V...
Page 30 20MU11 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A : DUNTK9532WEX0 (20MU11) R301 VRD-RA2BE222J J 2.2k 1/8W Carbon R302 VRS-CY1JF102J J 1.0k 1/16W M-Ox. R303 VRS-CY1JF153J J 15k 1/16W M-Ox. MAIN UNIT (Continued) R307 VRS-CY1JF333J J 33k 1/16W M-Ox.
Page 31 20MU11 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A : DUNTK9532WEX0 (20MU11) R2067 VRS-CY1JF103J J 10k 1/16W M-Ox. R2068 VRS-CY1JF103J J 10k 1/16W M-Ox. R2070 VRS-CY1JF103J J 10k 1/16W M-Ox. MAIN UNIT (Continued) R2101 VRS-CY1JF101J J 100 1/16W M-Ox.
Page 32: Crt Unit
20MU11 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A : DUNTK9532WEX0 (20MU11) PWB-B : DUNTK9530WEV6 (20MU11) CRT UNIT TRANSISTORS MAIN UNIT (Continued) Q852 VS2SC2229O/1E J 2SC2229 (O) Q854 VS2SC2229O/1E J 2SC2229 (O) HM726 LX-GZ3002PEZZ R Screw...
Page 33: Cabinet Parts
20MU11 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-B : DUNTK9533WEV4(20MU11) CABINET PARTS CRT UNIT CCABA0006WEH5 X Front Cabinet Ass'y TRANSISTORS (20MU11) Q852 VS2SC2229O/1E J 2SC2229 (O) Q854 VS2SC2229O/1E J 2SC2230 (O) Q856 VS2SC2229O/1E J 2SC2231 (O)
Page 34: Miscellaneous Parts
20MU11 Ref. No. Part No. Description Code Ref. No. Part No. Description Code MISCELLANEOUS PARTS ACC701 QACCD3064CESA M AC Cord å QACCD3060CESA QCNW-2110PEZZ R Connecting Cord (20MU11) QCNW-2111PEZZ R Connecting Cord QCNW-2112PEZZ R Connecting Cord QCNW-2160PEZZ R Connecting Cord (20MU11)
Page 35: Packing Of The Set
Code Ref. No. Part No. Description Code PACKING OF THE SET Polyethylene Bag Operation Manual Infrared R/C Unit Guarantee Card (20MU11) Batteries Polyethylene Cover Buffer Material FRONT Packing Case Use tape to fix the top side of packing case. REAR...
Page 36 QRC0002-L May. 2003 Modify : SEMEX Design and Production Information SHARP ELECTRONICA MEXICO S. A. DE C. V. Design base : JAPAN Quality & Reliability Control Center Production : SEMEX Blvd. SHARP No. 3510 Parque Industrial Rosarito...

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