Sharp 14A1-RU User Manual

1
14A1-RU
14A2-RU
1-21-1
SERVICE MANUAL
(14A1-RU) (14A2-RU)
COLOUR TELEVISION
Chassis No. UA-1
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.
14A1-RU
14A2-RU
MODELS
SHARP CORPORATION
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.
CONTENTS
» SPECIFICATIONS .............................. 2
» IMPORTANT SERVICE NOTES ......... 2
» ADJUSTMENT PRECAUTIONS ......... 3
» TROUBLE SHOOTING TABLE ......... 19
» HOTEL MODE APPLICATION .......... 21
» SOLID STATE DEVICE BASE
DIAGRAM ......................................... 22
» WAVEFORMS ................................... 23
» CHASSIS LAYOUT ........................... 24
» DESCRIPTION OF SCHEMATIC DIA-
GRAM ............................................... 26
» SCHEMATIC DIAGRAM
■ CRT Unit ....................................... 27
■ MAIN Unit ..................................... 28
» BLOCK DIAGRAM ............................ 32
» PRINTED WIRING BOARD ASSEM-
BLIES ................................................ 37
» REPLACEMENT PARTS LIST
■ ELECTRICAL PARTS ................... 42
■ MISCELLANEOUS PARTS........... 46
■ SUPPLIED ACCESSORIES ......... 46
■ PACKING PARTS ......................... 46
■ CABINET PARTS.......................... 46
Page Page
FEATURE
Ë
Multi 18 Systems
Ë
Full Auto Channel Preset and Auto Channel Skip
Ë
100-CH Program Memory
Ë
High Contrast Picture
Ë
Black Stretch Circuit
Ë
CATV (Hyper Band) Ready < Used Frequency Synthesizer
Tuner>
Ë
AVL (Sound Keeper) Function
Ë
Hotel Mode
Ë
On Timer / Sleep Timer / Reminder Timer
Ë
Colour Comb Filter Function (NTSC only)
Ë
Blue Back Noise Mute
Ë
Rear AV-In/Out Terminals and Front AV-In
Ë
English and Russian OSD
SX0M114A1-RU/

Sharp 14A1-RU Specifications

General

Display Type	CRT
Audio Interface	Mono
Aspect Ratio	4:3
Screen Size	14 inches
Video Interface	Composite
Inputs	Composite

Summary

General Safety Precautions

Specifications

Important Service Notes

Critical notes for qualified service personnel regarding safety and repair procedures.

Adjustment Precautions

Service Mode Settings and Data

EEPROM Initialization and Data

Initial Setting and Shipping Checks

PIF Adjustment

Purity Adjustment

Procedure for adjusting the CRT purity and beam alignment using magnets.

Convergence Adjustment

CRT Cut-off, Background, and Sub-Contrast Adjustment

PAL Chroma Adjustment

NTSC Chroma Adjustment

Procedure for adjusting NTSC color signals for accurate color reproduction.

Function Operation Checking (Video and Audio)

Memory Map

Troubleshooting Table

No Picture, No Sound Troubleshooting

Specific steps to diagnose and resolve issues with picture and sound.

Vertical and Horizontal Synchronization Issues

No Specific Colour (PAL/SECAM)

Waveforms

Schematic Diagram: CRT Unit

Schematic Diagram: 14A1-RU Main Unit

Block Diagram: 14A1-RU Main Unit (Part 1)

Block Diagram: 14A2-RU Main Unit (Part 2)

Block Diagram: CRT Unit (Part 3)

Parts List

Capacitors and Resistors

Resistors (Continued)