21JF2-RU/GA/SA/SF/SS
SERVICE MANUAL
No. S95O521JF2-RU
COLOUR TELEVISION
Chassis No. GA-4M
21JF2-RU
21JF2-GA
21JF2-SA
21JF2-SF
MODELS 21JF2-SS
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.
FEATURES
ع Multi 18 Systems
ع Front AV IN & Rear AV IN / OUT Terminals
ع Full Auto Channel Preset and Auto Channel Skip ع Front Headphone Jack
ع 100-CH Program Memory
ع Aperture Control Circuit
ع CATV (Hyper Band) Ready
ع Auto Fine Tuning
<Used Frequency Synthesizer Tuner> ع NTSC Colour Comb Filter (AV THRU)
ع Black Stretch Circuit
ع High Contrast Picture
ع On Timer / Off Timer / Reminder Timer ع Hotel Mode
ع Blue Back Function
ع White Temperature Select
ع Multi Languages OSD
(ENG / CHI / FRE / MAL / ARA / RUS)
for Model 21JF2-SF / SS Only.
(ENG / CHI / FRE / MAL / ARA)
for Model 21JF2-GA / SA Only.
(ENG / RUS)
for Model 21JF2-RU Only.
ع MONO
CONTENTS
CHAPTER 1. SPECIFICATIONS
[1] SPECIFICATIONS ........................................ 1-1
[2] BLOCK DIAGRAM: HEADPHONE UNIT........8-1
[3] BLOCK DIAGRAM: MAIN UNIT ....................8-2
CHAPTER 2. IMPORTANT SERVICE NOTES
[1] IMPORTANT SERVICE NOTES ................... 2-1
www.DataSheCeHt4AU.PcoTmER 3. ADJUSTMENT PRECAUTIONS
[1] ADJUSTMENT PRECAUTIONS ................... 3-1
[2] ADJUSTMENT ............................................ 3-14
CHAPTER 4. MEMORY MAP
[1] MEMORY MAP ............................................. 4-1
CHAPTER 5. TROUBLE SHOOTING FLOWCHART
[1] TROUBLE SHOOTING FLOWCHART ......... 5-1
CHAPTER 6. SOLID STATE DEVICE BASE DIA-
GRAM
[1] SOLID STATE DEVICE BASE DIAGRA.M....... 6-1
CHAPTER 7. CHASSIS LAYOUT
[1] CHASSIS LAYOUT ....................................... 7-1
CHAPTER 9. DESCRIPTION OF SCHEMATIC DIA-
GRAM
[1] DESCRIPTION OF SCHEMATIC DIA-
GRAM ............................................................ 9-1
CHAPTER 10. WAVEFORMS
[1] WAVEFORMS .............................................10-1
CHAPTER 11. SCHEMATIC DIAGRAM
[1] SCHEMATIC DIAGRAM: MAIN UNIT.......... 11-1
[2] SCHEMATIC DIAGRAM: CRT UNIT ........... 11-7
[3] SCHEMATIC DIAGRAM: HEADPHONE
UNIT ............................................................ 11-7
CHAPTER 12. PRINTED WIRING BOARD ASSEM-
BLIES
[1] PWB-B: CRT UNIT ......................................12-1
[2] PWB-C: HEADPHONE UNIT ......................12-1
[3] PWB-A: MAIN UNIT ....................................12-2
CHAPTER 8. BLOCK DIAGRAM
[1] BLOCK DIAGRAM: CRT UNIT ..................... 8-1
Parts Guide
WARNING
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 CORPORATION
