Table of Contents
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(14GT15)
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.
Ë Favorite Channel
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 Black Stretch Circuit
Ë On Timer/Sleep Timer/Reminder Timer
» SPECIFICATIONS ...........................................2
» IMPORTANT SERVICE NOTES ..................... 3
» ADJUSTMENT PRECAUTIONS ..................... 4
» TROUBLE SHOOTING TABLE ..................... 27
» CHASSIS LAYOUT ........................................32
» WAVEFORMS ................................................34
» SCHEMATIC DIAGRAM
TUNER .....................................................37
APPLICATION ..........................................38
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
(14GT20)
FEATURE
Ë Blue Back Noise Mute
Ë Front AV-In (14GT-20 Only)
Ë Rear AV-In/Out Terminals
Ë Colour Comb Filter (NTSC Only)
Ë High Contrast Picture
Ë Hotel Mode
Ë Front Headphone JACK (14GT-20 Only)
Ë English / Thai OSD
CONTENTS
Page
WARNING
SHARP CORPORATION
1
COLOUR TELEVISION
Chassis No. UA-1
14GT15
14GT20
MODELS
HEAD PHONE Unit and
CRT Socket Unit ...................................... 39
MAIN Unit ................................................. 40
» BLOCK DIAGRAM .........................................44
» REPLACEMENT PARTS LIST
ELECTRICAL PARTS .............................. 54
MISCELLANEOUS PARTS ...................... 58
SUPPLIED ACCESSORIES .................... 58
PACKING PARTS .................................... 58
CABINET PARTS .................................... 59
14GT15
14GT20
S30Y114GT15//
Page
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Table of Contents
Related Manuals for Sharp 14GT15
Summary of Contents for Sharp 14GT15
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Page 1: Table Of Contents
PACKING PARTS ........58 INFRARED REMOTE CONTROL UNIT .. 36 TUNER .............37 CABINET PARTS ........59 14GT15, 14GT20 HOTEL MODE APPLICATION ..........38 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. -
Page 2: Specifications
14GT15 14GT20 SPECIFICATIONS Convergence ..............Self Convergence System Focus ............Electrostatic Focus High Bi-Potential Sweep Deflection ..................Magnetic Intermediate Frequencies Picture IF Carrier .................. 38.9MHz Sound IF Carrier Frequency 5.5MHz ....................33.4MHz Colour Sub-Carrier Frequency ............34.47MHz Power Input ..............100 ~ 240V AC 50/60 Hz Power Consumption .................. -
Page 3: Important Service Notes
14GT15 14GT20 IMPORTANT SERVICE NOTES Maintenance and repair of this receiver should be done by qualified service personnel only. SERVICE OF HIGH VOLTAGE SYSTEM AND PIC- TURE TUBE When servicing the high voltage system, remove static charge from it by Connecting a 10K ohm Resistor in series with an insulated wire(such as a test probe) between picture tube dag and 2nd anode lead. -
Page 4: Adjustment Precautions
14GT15 14GT20 ADJUSTMENT PRECAUTIONS This model's setting are adjusted in two different ways: through the I C bus control and in the conventional analog manner. The adjustments via the I C bus control include preset-only items and variable data. 1. Setting the service mode by the microprocessor. -
Page 5: 14Gt15
14GT15 14GT20 SERVICE MODE (1) In the Service Mode, Key is used to select the mode in the following order. AGC & WHITE POINT GEOMETRIC ADJ. ADJ. MODE MODE MODE Y-DELAY ADJ. MODE MISC. OFFSET OPTION OPTION ADJ. MODE MODE... -
Page 6: 14Gt15
14GT15 14GT20 OFFSET ADJ. OPTION MODE MODE COLOUR OFFSET (PAL) (COL-OP) VERTICAL SCAN DISABLE(VSD) COLOUR OFFSET (SECAM) (COL-OS) BLACK STRETCH (BKS) COLOUR OFFSET (NTSC358) (COL-O3) AUTO VOLUME LEVELING(AVL) FAST FILTER IF-PLL(FFI) COLOUR OFFSET (NTSC443) (COL-O4) SHARPNESS OFFSET (PAL) (SHP-OP) ENABLE VERTICAL GUARD (EVG) -
Page 7: 14Gt15
14GT15 14GT20 USER DATA IN SERVICE MODE The flow of Mode lists as following, * Direct Key-in Step1 Mode RC COMMAND SERVICE-ITEM FUNCTION CONTRAST DOWN V-LIN COLOUR DOWN V-AMP BRIGHTNESS DOWN V-CENT TINT DOWN H-CENT SHARPNESS DOWN EW / /... -
Page 8: 14Gt15
14GT15 14GT20 AFTER SHORT JA 122 & JA 124 ,AND TURN ON THE MAIN POWER SWITCH,READ DATA FROM EEPROM ADDRESS 00H ~ 03H,AND COMPARE TO THE LIST BELOW, IF DIFFERENT, INITIALIZE THE EEPROM. Address : Data Address : Data EEPROM ITEMS... -
Page 9: 14Gt15
0(DISABLE)/1(ENABLE) PHI-1 TIME CONSTANT (OFF AIR) FOB-AV 0(DISABLE)/1(ENABLE) NOTE : FIXED DATA,PLEASE DO NOT CHANGE WITHOUT SPECIFIC INSTRUCTION. *1: MANUALLY CHANGE TO 0. *2: FOR 14GT15, MANUALLY CHANGE TO 0. *3: MANUALLY CHANGE TO 1. *4: MANUALLY CHANGE TO 0. -
Page 10: 14Gt15
14GT15 14GT20 SHIPPING SETTING & CHECKING (1) The following default data has been factory-set for the E PROM. ITEMS DATA SETTING LAST PROGRAM/CHANNEL FLASHBACK PROGARM/CH DIGIT C-SYSTEM AUTO S-SYSTEM SKIP VOLUME CONTRAST (MAX) COLOUR 0 (CENTER) BRIGHTNESS 0 (CENTER) TINT... -
Page 11: 14Gt15
14GT15 14GT20 PIF ADJUSTMENT No. Adjusting point Adjusting procedure/conditions Waveform and others Tuner IFT 1. Get the tuner ready to receive the CH. E - 9 ( PRESET ) signal,but with no signal input. Adjust the PLL data. 2. Connect the sweep generator's output cable to... -
Page 12: 14Gt15
14GT15 14GT20 PURITY ADJUSTMENT No. Adjusting point Adjusting procedure/conditions Waveform and others PURITY ADJ. 1. Receive the GREEN-ONLY signal. Adjust the beam current to about 500 A. 2. Maintain the purity magnet at the zero magnetic field and keep the static convergence roughly adjusted. -
Page 13: 14Gt15
14GT15 14GT20 CONVERGENCE ADJUSTMENT No. Adjusting point Adjusting procedure/conditions Waveform and others CONVERGENC 1. Receive the "Crosshatch Pattern" signal. ADJ. 2. Using the remote controller, call NORMAL mode. ( To be done after the purity STATIC CONVERGENCE adjustment. 1. Turn the 4-pole magnet to a proper opening an- gle in order to superpose the blue and red col- ours. -
Page 14: 14Gt15
14GT15 14GT20 CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT No. Adjusting point Adjusting procedure/conditions Waveform and others CRT CUTOFF 1. Switch TV to VIDEO mode,BLUE BACK OFF, with ADJUSTMENT NO VIDEO signal. 3.0Vdc C BUS 2. Press R/C to set Picture Normal condition. -
Page 15: 14Gt15
14GT15 14GT20 HORIZONTAL AND VERTICAL DEFLECTION LOOP ADJUSTMENT No. Adjusting point Adjusting procedure/conditions Waveform and others V-SLOPE (I 1. Receive Monoscope Pattern Signal. BUS CON- 2. Call the "V-LIN" mode. TROL) 3. Increase or decrease "V-LIN" by Volume key till the horizontal line in the center of monoscope is just at the position where the blanking starts. -
Page 16: 14Gt15
14GT15 14GT20 NTSC CHROMA ADJUSTMENT No. Adjusting point Adjusting procedure/conditions Waveform and others SUB-TINT (I 1. Receive the "NTSC3.58 Colour Bar" signal BUS CON- through AV in. TROL) 2. Connect the oscilloscope to TP853 (Pin (5) of (SAME LEVEL) P882) BLUE-OUT. -
Page 17: 14Gt15
14GT15 14GT20 FUNCTION OPERATION CHECKING (VIDEO AND AUDIO) No. Adjusting point Adjusting procedure/conditions Waveform and others CONTRAST 1. Receive "Monoscope Pattern" signal. 2. Set P-Mode to select CONTRAST. 3. Press Volume Up/Down key to check whether the CONTRAST effect is OK or not. -
Page 18: 14Gt15
14GT15 14GT20 FUNCTION OPERATION CHECKING (VIDEO AND AUDIO) (Continued) No. Adjusting point Adjusting procedure/conditions Waveform and others COLOUR 1. Receive the "PAL COLOUR BAR" signal, press SYSTEM the COLOUR SYSTEM key to select modes ex- cept PAL, check the COLOUR is not working prop- erly. -
Page 19: 14Gt15
14GT15 14GT20 MEMORY MAP ADDRESS DATA MICON E PROM E PROM CHASSIS CTV FINAL LAST INITIAL REMARK (HEX) DEFAULT RANGE WRITE(CPU) CHECK DATA CHECK TYPE CHECK DATA CHECK TYPE SETTING DATA PASS WORD 00-FF PASS WORD 00-FF PASS WORD 00-FF... -
Page 20: 14Gt15
14GT15 14GT20 ADDRESS DATA MICON E PROM E PROM CHASSIS CTV FINAL LAST INITIAL REMARK (HEX) DEFAULT RANGE WRITE(CPU) CHECK DATA CHECK TYPE CHECK DATA CHECK TYPE SETTING DATA SHARPNESS-OFFSET (SECAM) 00-0F SHARPNESS-OFFSET (N443) 00-0F SHARPNESS-OFFSET (N358) 00-0F 00-FF N443... -
Page 21: 14Gt15
14GT15 14GT20 ADDRESS DATA MICON E PROM E PROM CHASSIS CTV FINAL LAST INITIAL REMARK (HEX) DEFAULT RANGE WRITE(CPU) CHECK DATA CHECK TYPE CHECK DATA CHECK TYPE SETTING DATA TUNING FREQUENCY (HIGHER PART) POS 4 TUNING FREQUENCY (LOWER PART) S-SYS... -
Page 22: 14Gt15
14GT15 14GT20 ADDRESS DATA MICON E PROM E PROM CHASSIS CTV FINAL LAST INITIAL REMARK (HEX) DEFAULT RANGE WRITE(CPU) CHECK DATA CHECK TYPE CHECK DATA CHECK TYPE SETTING DATA TUNING FREQUENCY (LOWER PART) S-SYS (auto) C-SYS TUNING FREQUENCY (HIGHER PART) -
Page 23: 14Gt15
14GT15 14GT20 ADDRESS DATA MICON E PROM E PROM CHASSIS CTV FINAL LAST INITIAL REMARK (HEX) DEFAULT RANGE WRITE(CPU) CHECK DATA CHECK TYPE CHECK DATA CHECK TYPE SETTING DATA POS 46 TUNING FREQUENCY (HIGHER PART) POS 47 TUNING FREQUENCY (LOWER PART) -
Page 24: 14Gt15
14GT15 14GT20 ADDRESS DATA MICON E PROM E PROM CHASSIS CTV FINAL LAST INITIAL REMARK (HEX) DEFAULT RANGE WRITE(CPU) CHECK DATA CHECK TYPE CHECK DATA CHECK TYPE SETTING DATA TUNING FREQUENCY (HIGHER PART) POS 68 TUNING FREQUENCY (LOWER PART) S-SYS... -
Page 25: 14Gt15
14GT15 14GT20 ADDRESS DATA MICON E PROM E PROM CHASSIS CTV FINAL LAST INITIAL REMARK (HEX) DEFAULT RANGE WRITE(CPU) CHECK DATA CHECK TYPE CHECK DATA CHECK TYPE SETTING DATA POS 89 TUNING FREQUENCY (HIGHER PART) POS 90 TUNING FREQUENCY (LOWER PART) -
Page 26: 14Gt15
14GT15 14GT20 ADDRESS DATA MICON E PROM E PROM CHASSIS CTV FINAL LAST INITIAL REMARK (HEX) DEFAULT RANGE WRITE(CPU) CHECK DATA CHECK TYPE CHECK DATA CHECK TYPE SETTING DATA MODEL MODEL LETTER NO. LETTER NO. -
Page 27: Trouble Shooting Table
14GT15 14GT20 TROUBLE SHOOTING TABLE NO RASTER Check F701. Blown out. Replace the fuse. Check T701 pin (7) voltage The fuse is again blown out. (Approx. 310V at 220V AC) Check R701, R707 and Check IC701, D701,C707 D709. and D710. -
Page 28: 14Gt15
14GT15 14GT20 TROUBLE SHOOTING TABLE (Continued) CIRCUITS TO BE CHECKED: NO PICTURE, NO SOUND » Tuner. » PIF. » Automatic Gain Control. » (5V), (32V) Power Source. Does the noise level increase at max. Contrast, Brightness and Sound controls ? Noise increases but no signal is No snow noise. - Page 29 14GT15 14GT20 TROUBLE SHOOTING TABLE (Continued) NEITHER VERTICAL NOR HORIZONTAL SYNCHRONIZATION CIRCUIT TO BE CHECKED: » Sync. Separator Circuit. Check pins(16), (17) and (34) of IC801. DEFECTIVE VERTICAL AMP. AND VERTICAL LINEARITY Readjust vertical size. (Bas Data) Vertical linearity and size is abnormal.
- Page 30 14GT15 14GT20 TROUBLE SHOOTING TABLE (Continued) NO SPECIFIC COLOUR Is some colour produced in B/W broadcast reception ? Is the white balance properly Check IC801, R801, R802, adjusted ? R803, D804, D805, D806 and Q801. Readjust the white balance. The picture colour is cyan.
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Page 31: Solid State Device Base Diagram
14GT15 14GT20 SOLID STATE DEVICE BASE DIAGRAM TOP VIEW COLLECTOR COLLECTOR :BG: BASE EMITTER BASE EMITTER M24C04W B709A FX0008GE D601A COLLECTOR BASE EMITTER iX3368CEN0 2SC2735 SIDE VIEW BASE 1 2 3 COLLECTOR BASE EMITTER COLLECTOR EMITTER 2SC1815 2SC2482 PST573J SE115N... -
Page 32: Chassis Layout
14GT15 14GT20 MODEL 14GT15 CHASSIS LAYOUT... -
Page 33: 14Gt15
14GT15 14GT20 MODEL 14GT20 CHASSIS LAYOUT... -
Page 34: Waveforms
14GT15 14GT20 WAVEFORMS... -
Page 35: Description Of Schematic Diagram
14GT15 14GT20 DESCRIPTION OF SCHEMATIC DIAGRAM SAFETY NOTES: NOTES: 1. The unit of resistance "ohm" is omitted. 1. DISCONNECT THE AC PLUG FROM THE AC OUTLET BEFORE REPLACING PARTS. (K = 1000 ohms, M = Mega ohm). 2. SEMICONDUCTOR HEAT SINKS SHOULD BE REGARDED AS 2. -
Page 36: Infrared Remote Control Unit
14GT15 14GT20 Infrared Remote Control Unit RRMCG0025KJSA Note:The parts here shown are supplied as an assembly but not independently. -
Page 37: Tuner
14GT15 14GT20 TUNER å å å VTUVTST5HD84/ å å Note:The parts here shown are supplied as an assembly but not independently. 105p C161 R310 L151 R172 R171 T301 R306 R117 R120 R111 L111 L113 HSC277 D111 HSC277 D110... -
Page 38: 14Gt15, 14Gt20 Hotel Mode Application
14GT15 14GT20 14GT15 , 14GT20 HOTEL MODE APPLICATION How to enable/disable the "Hotel Mode" ? Ans: a) Press the R/C (FUNCTION) key until language selection appear,within five second press the (one/two digit) key and keep pressing it for five second, then you can see the hotel mode with four digits password. -
Page 39: Crt Socket Unit
14GT15 14GT20 SCHEMATIC DIAGRAM: MODEL 14GT20 HEAD PHONE Unit CRT SOCKET Unit... -
Page 40: Main Unit
14GT15 14GT15 14GT20 14GT20 SCHEMATIC DIAGRAM: MODEL 14GT15 MAIN Unit... - Page 41 14GT15 14GT15 14GT20 14GT20 SCHEMATIC DIAGRAM: MODEL 14GT20 MAIN Unit...
- Page 42 14GT15 14GT15 14GT20 14GT20 BLOCK DIAGRAM - 1/3:M0DEL 14GT15 MAIN BLOCK...
- Page 43 14GT15 14GT15 14GT20 14GT20 BLOCK DIAGRAM - 2/3:M0DEL 14GT20 MAIN BLOCK...
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Page 44: Block Diagram - 3/3
14GT15 14GT20 BLOCK DIAGRAM - 3/3: MODEL 14GT20 HEAD PHONE BLOCK CRT BLOCK... -
Page 45: Printed Wiring Board Assemblies
14GT15 14GT20 PRINTED WIRING BOARD ASSEMBLIES PWB-B: CRT Socket Unit (Wiring Side) PWB-C: HEAD PHOME Unit (MODEL 14GT20) (Wiring Side) (Component Side) - Page 46 14GT15 14GT15 14GT20 14GT20 PWB-A: MAIN Unit (Wiring Side)
- Page 47 14GT15 14GT15 14GT20 14GT20 PWB-A: MAIN Unit (Component Side)
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Page 48: Parts List
— D609 VHD1SS119//-1 R 1SS119 PWB-A DUNTK9988WET3 - Main Unit (14GT20) — D611 RH-DX0302CEZZ R Diode PWB-B DUNTK9990WET3 - CRT Socket Unit (14GT15) — D612 RH-EX0627GEZZ R Zener Diode PWB-B DUNTK9990WET2 - CRT Socket Unit (14GT20) — D613 VHD1SS119//-1 R 1SS119 PWB-C DUNTK9989WET0 - Head Phone Unit (14GT20) —... - Page 49 14GT15 14GT20 Ref. No. Part No. Description Code Ref. No. Part No. Description Code D804 VHD1SS119//-1 R 1SS119 C356 VCKYCY1HB682K R 6800p 50V Ceramic D805 VHD1SS119//-1 R 1SS119 C359 VCEA9M1CW106M R 10 Electrolytic D806 VHD1SS119//-1 R 1SS119 C360 VCEA9M1HW225M R 2.2...
- Page 50 14GT15 14GT20 Ref. No. Part No. Description Code Ref. No. Part No. Description Code C712 VCQYTA1HM102J R 1000p 50V Mylar R302 VRS-CY1JF473J R 47k 1/16W Metal Oxide C713 RC-KZ007JCEZZ R 0.01 250V Ceramic R303 VRS-CY1JF473J R 47k 1/16W Metal Oxide...
- Page 51 14GT15 14GT20 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R701 VRW-KQ3NC3R9K R 3.9 Cement S1004 QSW-K0077GEZZ R Switch R703 VRS-KT3LB473J R 47k Metal Oxide S1005 QSW-K0077GEZZ R Switch å R704 VRG-PD2HD150J R 15 1/2W Fuse Resistor AC...
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Page 52: Miscellaneous Parts
1/16W Metal Oxide MISCELLANEOUS PARTS J351 QJAKJ0047CEZZ R Jack P351 QPLGN0441CEZZ R Plug PACKING PARTS < > NOT REPLACEMENT ITEM SPAKC0104KJZZ - Packing Case(14GT15) — SPAKC0103KJZZ - Packing Case(14GT20) — SPAKP0677CEZZ - Wrapping Paper — SPAKX0069KJZZ - Buffer Material (Top) — SPAKX0070KJZZ - Buffer Material (Bottom) —... -
Page 53: Cabinet Parts
14GT15 14GT20 Ref. No. Part No. Description Code Ref. No. Part No. Description Code MODEL 14GT15 CABINET PARTS MODEL 14GT20 CABINET PARTS CCABA0081WEA0 Front Cabinet Ass'y CCABA0080WEA0 Front Cabinet Ass'y Not Available - Front Cabinet — Not Available - Front Cabinet —... - Page 54 Code Ref. No. Part No. Description Code COPYRIGHT © 2000 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.