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20D2-S/G
21D2-S/G
In the interests of user-safety (Required by safety regulations in some countries) the set should be re-
stored to its original condition and only parts identical to those specified should be used.
Ë Multi 18 systems
Ë Full Auto Channel Preset and Auto Channel Skip
Ë 100-CH Program Memory
Ë CATV(Hyper Band) Ready
<Used Frequency Synthesizer Tuner>
Ë AVL(Sound Keeper) Function
Ë High Contrast Picture(Black Stretch Circuit)
Ë On Timer/Sleep Timer/Reminder Timer
Ë Blue Back Noise Mute
» SPECIFICATIONS ............................................. 2
» IMPORTANT SERVICE NOTES ........................ 2
» ADJUSTMENT PRECAUTIONS ........................ 3
» MEMORY MAP ................................................ 12
» GA1 HOTEL MODE APPLICATION ................ 16
» TROUBLE SHOOTING TABLE ....................... 16
» WAVEFORMS .................................................. 19
» SOLID STATE DEVICE BASE DIAGRAM ....... 21
» CHASSIS LAYOUT .......................................... 22
» BLOCK DIAGRAM ........................................... 25
Ë CRT UNIT ..................................................... 32
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 - serviceable
parts inside. Refer servicing to qualified service personnel.
SERVICE MANUAL
21D1-S/G
MODELS
FEATURES
Ë Front AV-In & Rear AV-In/Out Terminals
Ë Colour Comb Filter(NTSC only)
Ë Headphone Terminal
Ë Hotel Mode
Ë Arabic/Chinese/English/French/Malay/Russian
Ë White Temperature Adjustment
CONTENTS
Page
WARNING
SHARP CORPORATION
1
COLOUR TELEVISION
Chassis No. GA-1
20D2-S/G
21D1-S/G
21D2-S/G
(Front Priority)
6 Languages OSD
Ë HEADPHONE JACK UNIT ........................... 33
Ë MAIN UNIT ................................................... 34
» PRINTED WIRING BOARD ASSEMBLIES ..... 40
Ë ELECTRICAL PARTS
MAIN UNIT ................................................... 45
CRT UNIT ..................................................... 48
HEAD PHONE JACK UNIT .......................... 49
Ë SUPPLIED ACCESSORIES ........................ 49
Ë PACKING PARTS ......................................... 49
Ë CABINET PARTS ......................................... 50
» PACKING OF THE SET ................................... 51
20D2-S/G
21D1-S/G
21D2-S/G
S92Q420D2-S//
Page
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Table of Contents
Related Manuals for Sharp 21D2-S
Summarization of Contents
Specifications
Important Service Notes
Essential safety and servicing guidelines for qualified personnel.
Service of High Voltage System and Picture Tube
Precautions for servicing high voltage components and picture tube.
X-Ray
Safety precautions to minimize X-ray radiation during servicing.
Before Returning the Receiver
Safety checks to perform before returning the serviced unit to the user.
Adjustment Precautions
Service Mode
Procedure for entering and operating the TV's service mode for adjustments.
PIF Adjustment
Adjusting the Intermediate Frequency (IF) circuit for optimal performance.
Purity Adjustment
Adjusting the CRT's purity and convergence for accurate color reproduction.
Convergence Adjustment
Steps for static and dynamic convergence adjustments for the CRT display.
CRT Cut-Off, Background and Sub-Contrast Adjustment
Adjusting CRT cutoff, background, and sub-contrast for optimal picture quality.
White Balance Service Mode Adj.
Adjusting white balance settings using the service mode for accurate colors.
PAL Chroma Adjustment
Adjusting color parameters for PAL television signals.
NTSC Chroma Adjustment
Adjusting color parameters for NTSC television signals.
Horizontal and Vertical Deflection Loop Adjustment
Adjusting deflection loop parameters for proper picture geometry.
Protector Operation Checking
Verifying the operation of protection circuits within the TV.
Initial Setting
Shipping Setting & Checking
Default factory settings and procedures for shipping checks.
Trouble Shooting Table
No Raster
Troubleshooting steps for issues with no picture display.
GA1 Hotel Mode Application
Instructions for enabling and using the hotel mode feature.
No Picture, No Sound
Diagnostic steps for TV issues with no picture and no sound.
Neither Vertical Nor Horizontal Synchronization
Troubleshooting steps for loss of picture synchronization.
Defective Vertical Amp. and Vertical Linearity
Diagnosing and fixing issues with vertical amplifier and linearity.
No Vertical Scan
Troubleshooting steps for the absence of a vertical picture scan.
No Sound
Steps to diagnose and resolve sound output problems.
No Specific Colour
Troubleshooting steps for missing or incorrect color display.
No Specific Colour "PAL"/"SECAM"
Diagnosing color synchronization issues for PAL/SECAM signals.
Waveforms
(21D1-S/G, 21D2-S/G)
Displays of expected waveforms for troubleshooting on specific models.
Waveforms
(20D2-S/G)
Displays of expected waveforms for troubleshooting on specific models.
Chassis Layout
20D2-S/G
Component layout diagram for the 20D2-S/G chassis.
Chassis Layout
21D1-S/G
Component layout diagram for the 21D1-S/G chassis.
Chassis Layout
21D2-S/G
Component layout diagram for the 21D2-S/G chassis.
Block Diagram
CRT Unit : 20D2-S/G
Block diagram of the CRT unit for the 20D2-S/G model.
CRT Unit : 21D1-S/G, 21D2-S/G
Block diagram of the CRT unit for 21D1-S/G and 21D2-S/G models.
Main Unit : 20D2-S/G, 21D2-S/G
Block diagram of the main unit for 20D2-S/G and 21D2-S/G models.
Main Unit : 21D1-S/G
Block diagram of the main unit for the 21D1-S/G model.
Headphone Jack Unit
Block diagram of the headphone jack unit.
Schematic Diagram
CRT Unit : 20D2-S/G
Schematic diagram for the CRT unit of the 20D2-S/G model.
CRT Unit : 21D1-S/G, 21D2-S/G
Schematic diagram for the CRT unit of 21D1-S/G and 21D2-S/G models.
Schematic Diagram
Headphone Jack Unit
Schematic diagram for the headphone jack unit.
Printed Wiring Board Assemblies
PWB-A: Main Unit (Component Side)
Component layout of the main unit's printed wiring board (component side).
PWB-A: Main Unit (Chip Parts Side)
Component layout of the main unit's printed wiring board (chip parts side).
Replacement Parts List
Transistors
List of replacement transistors with part numbers and codes.
Diodes
List of replacement diodes with part numbers and codes.
Picture Tube
List of replacement picture tubes with part numbers and codes.
Printed Wiring Board Assemblies
List of replacement Printed Wiring Board assemblies.
Tuner
List of replacement tuner components with part numbers.
Integrated Circuits
List of replacement integrated circuits with part numbers.
Packaged Circuits
List of replacement packaged circuits with part numbers.
Filters
List of replacement filters with part numbers and codes.
Coils
List of replacement coils with part numbers and codes.
Transformers
List of replacement transformers with part numbers and codes.
Capacitors
List of replacement capacitors with part numbers and codes.
Resistors
List of replacement resistors with part numbers and codes.
Miscellaneous Parts
List of various miscellaneous replacement parts.
Headphone Jack Unit
List of replacement parts for the headphone jack unit.
Packing Parts
List of packing materials for the product.
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