Sharp 21F-PT220 Service Manual

21F-PT220
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.
PAL-B/G, D/K
Frequency Synthesizer Tuner
Full Auto System
100-CH Program Memory
CATV (Hyper Band Ready)
Hotel Mode
CHAPTER 1. SPECIFICATIONS
[1] SPECIFICATIONS ......................................... 1-1
Chapter 2. Important Service Notes
[1] Important Service Notes .................... 2-1
CHAPTER 3. ADJUSTMENT PRECAUTIONS
[1] ADJUSTMENT PRECAUTIONS .................... 3-1
[2] ADJUSTMENT ............................................. 3-14
Chapter 4. Memory Map
[1] MEMORY MAP...................................................
Chapter 5. Trouble Shooting Flowchart
[1] TROUBLE SHOOTING FLOWCHART .......... 5-1
Chapter 6. Solid State Device Base Diagram
[1] SOLID STATE DEVICE BASE DIAGRAM..... 6-1
CHAPTER 7. CHASSIS LAYOUT
[1] CHASSIS LAYOUT ....................................... 7-1
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.
SHARP MANUFACTURING (THAILAND) CO.,LTD.
1st Edition

SERVICE MANUAL

21F-PA18
21F-PA18(B)

FEATURES

White Temperature Select
Off Timer
Blue Back Function
Aperture Control Circuit
Auto Fine Tuning
NTSC Colour Comb Filter
CONTENTS
4-1
WARNING
21F-PD250 / 21F-PT220 / 21F-PA18 / 21F-PA18(B)
COLOUR TELEVISION
21F-PD250
High Contrast Picture ( Black Stretch Circuit)
Child Lock
Multi Languages OSD (English/Thai)
Rear AV IN / OUT Terminals
Front AV-IN Terminal (Model 21F-PT220)
Chapter 8. Block Diagram
[1] BLOCK DIAGRAM : MAIN UNIT................... 8-1
[2] BLOCK DIAGRAM : CRT UNIT ...................... 8-9
Chapter 9. Description Of Schematic Dia-
GRAM
[1] Description Of Schematic Diagram... 9-1
CHAPTER 10. WAVEFORMS
[1] WAVEFORMS ............................................... 10-1
Chapter 11. Schematic Diagram
[1] SCHEMATIC DIAGRAM : CRT UNIT ............ 11-1
[2] SCHEMATIC DIAGRAM : MAIN UNIT .......... 11-2
Chapter 12. Printed Wiring Board Assem-
BLIES
[1] PWB-A : MAIN UNIT ..................................... 12-1
[2] PWB-B : CRT UNIT ....................................... 12-3
Parts Guide
Chassis No.GA-7
21F-PA18
21F-PA18(B)
21F-PD250
21F-PT220