Sharp 14GT15 Manual de usuario

14GT15

14GT20

SHARP CORPORATION

SERVICE MANUAL

14GT15

14GT20

MODELS

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.

FEATURE

ËFavorite Channel

ËFull Auto Channel Preset and Auto Channel Skip

Ë100-CH Program Memory

ËCATV(Hyper Band) Ready <Used Frequency Synthesizer

Tuner>

ËAVL(Sound Keeper) Function

ËBlack Stretch Circuit

ËOn Timer/Sleep Timer/Reminder Timer

ËBlue Back Noise Mute

ËFrontAV-In (14GT-20 Only)

ËRearAV-In/Out Terminals

ËColour Comb Filter (NTSC Only)

ËHigh Contrast Picture

ËHotel Mode

ËFront Headphone JACK (14GT-20 Only)

ËEnglish / Thai OSD

WARNING

Thechassis in thisreceiver ispartially hot. Use anisolation transformerbetween the linecord plugand power

receptacle,whenservicingthischassis. Topreventelectricshock,donotremovecover. Nouser–serviceable

parts inside. Refer servicing to qualified service personnel.

»SPECIFICATIONS ...........................................2

»IMPORTANT SERVICE NOTES ..................... 3

»ADJUSTMENT PRECAUTIONS..................... 4

»TROUBLE SHOOTING TABLE..................... 27

»SOLID STATE DEVICE BASE DIAGRAM .... 31

»CHASSIS LAYOUT ........................................32

»WAVEFORMS................................................34

»DESCRIPTION OF SCHEMATIC DIAGRAM . 35

»SCHEMATIC DIAGRAM

■INFRARED REMOTE CONTROL UNIT .. 36

■TUNER .....................................................37

■14GT15, 14GT20 HOTEL MODE

APPLICATION ..........................................38

■HEAD PHONE Unit and

CRT Socket Unit ...................................... 39

■MAIN Unit .................................................40

»BLOCK DIAGRAM.........................................44

»PRINTED WIRING BOARD ASSEMBLIES .. 49

»REPLACEMENT PARTS LIST

■ELECTRICAL PARTS .............................. 54

■MISCELLANEOUS PARTS...................... 58

■SUPPLIED ACCESSORIES .................... 58

■PACKING PARTS .................................... 58

■CABINET PARTS .................................... 59

Page Page

CONTENTS

COLOUR TELEVISION

Chassis No. UA-1

(14GT15) (14GT20)

S30Y114GT15//

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........................................................................................ 65W

Audio Power Output Rating.............................................................. 3.0W(at Max.)

Speaker

Size...................................................................................5 x 9 cm Elliptic (1pc)

Voice Coil Impedance ...........................................................16 ohms at 400 Hz

Aerial Input Impedance

VHF/UHF ..........................................................................75 ohms Unbalanced

Receiving Channel

PAL B/G

VHF-Channels ...................................... E2(48.25MHz) thru E12(224.25MHz)

UHF-Channels .................................. E21(471.25MHz) thru E69(855.25MHz)

Dimensions ...................................................................................Width: 351.0mm

Height: 361.0mm

Depth: 359.0mm

Weight(approx): 9.2 kg

Cabinet material.................................................................................... All Plastics

Specifications are subject to change without prior notice.

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. (AC line cord

should be disconnected from AC outlet.)

1. Picture tube in this receiver employs integral implosion protection.

2. Replace with tube of the same type number for continued safety.

3. Do not lift picture tube by the neck.

4. Handle the picture tube only when wearing shatterproof goggles and after discharging

the high voltage completely.

X-RAY

This receiver is designed so that any X-Ray radiation is kept to an absolute

Minimum. Since certain malfunctions or servicing may produce potentially

hazardous radiation with prolonged exposure at close range, the followin

precautions should be observed:

1. When repairing the circuit, be sure not to increase the high voltage to more than 25.8kV

(at beam 0 µA) for the set.

2. To keep the set in a normal opeartion , be sure to make it function on 22.8kV ±1.5kV (at

beam 800 µA) in the case of the set. The set has been factory - Adjusted to the above-

mentioned high voltage.

∴If there is a possibility that the high voltage fluctuates as a result of the repairs,

never forget to check for such high voltage after the work.

3. Do not substitute a picture tube with unauthorizerd types and/or brands which may

cause excess X-ray radiation.

BEFORE RETURNING THE RECEIVER

Before returning the receiver to the user, perform the following safety Checks.

1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not

lodged between the chassis and other metal parts in the receiver.

2. Inspect all protective devices such as non-metallic control knobs, insulating fishpapers,

cabinet backs, adjustment and compartment covers or shields, isolation resistor- ca-

pacity networks, mechanical insulators etc.

14GT15

14GT20

ADJUSTMENT PRECAUTIONS

This model's setting are adjusted in two different ways: through the I2C bus control and in the conventional

analog manner. The adjustments via the I2C bus control include preset-only items and variable data.

1. Setting the service mode by the microprocessor.

1. Short JA 122 & JA 124 for 1 second and release to switch to the service mode position, and the

microprocessor is in input mode. (Adjustment through the I2C bus control). (Use JWS Key to set as

well).

2. Press the CH DOWN / UP key on the remote controller to get ready to select the mode one by one.

3. Press the CH DOWN / UP key on the remote controller to select the modes reversibly one by one.

4. Using the VOLUME UP/ DOWN key on the remote controller, the data can be modified.

5. Short JA 122 & JA 124 for 1 second and release to switch to the normal mode (OFF) position, and the

microprocessor is in out of the service mode.

2. Factory Presetting.

1. Short JA 122 & JA 124 for 1 second and release to switch to the service mode position and turn on the

main power switch.Initial values are automatically preset, only when a new EEPROM is used (Judge

with the first 4 bytes ).

2. The initial data are preset as listed in page 7, 8, & 9.

3. Make sure the data need modify or not (Initial data).

Note: Once the chassis has been assembly together and ready to be POWER ON for the FIRST TIME,

make sure to short JA122 & JA124 to switch to the service mode position first and then turn on the

main power switch (See 2-(1) above).

Precaution: If haven't done this initiation, it may possibly generate excessive Beam current.

3. For reference please check with memory map

(UA1 Series type RH-iX3368CE Attachment)

14GT15

14GT20

SERVICE MODE

(1) In the Service Mode, Key is used to select the mode in the following order.

AGC &

GEOMETRIC

MODE

↓

AGC TAKE OVER POINT (AGC)

↓

VERTICAL SLOPE (V-LIN)

↓

VERTICALAMP (V-AMP)

↓

VERTICAL SHIFT (V-CENT)

↓

HORIZONTAL SHIFT (H-CENT)

↓

S-CORRECTION (S-COR)

WHITE POINT

ADJ.

MODE

↓

W.P. RED STD. W.T. (DRI-RS)

↓

W.P. GREEN STD. W.T.(DRI-GS)

↓

W.P.BLUE STD. W.P. (DRI-BS)

↓

W.P. RED COOL W.P.(DRI-RC)

↓

W.P. GREEN COOL W.P.(DRI-GC)

↓

W.P. BLUE COOL W.P. (DRI-BC)

↓

W.P. RED WARM W.P.(DRI-RW)

↓

W.P. GREEN WARM W.P.(DRI-GW)

↓

W.P. BLUE WARM W.P.(DRI-BW)

SUB

ADJ.

MODE

↓

MAX VOLUME (SUB-VOL)

↓

SUB CONTRAST (SUB-CON)

↓

SUB COLOUR (SUB-COL)

↓

SUB BRIGHTNESS (SUB-BRI)

↓

SUB TINT (SUB-TINT)

↓

SUB SHARPNESS (SUB-SHP)

↓

MAX HOTEL VOLUME (HTL-VOL)

↓

HOTEL PROGRAM NO(HTL-PRG)

↓

OSD GRB REFERENCE (RGB)

↓

BLACK LEVEL OFFSET R(CUT-R)

↓

BLACK LEVEL OFFSET G(CUT-G)

↓

CATHODE DRIVE LEVEL(CDL)

FORWARD : CH DOWN KEY

REVERSE : CH UP KEY

* ( ) means OSD display.

FORWARD : CH DOWN KEY

REVERSE : CH UP KEY

AGC &

GEOMETRIC

MODE

WHITE POINT

ADJ.

MODE

SUB

ADJ.

MODE

Y-DELAY

ADJ.

MODE

MISC.

OPTION

MODE

OPTION

MODE

OFFSET

ADJ.

MODE

14GT15

14GT20

Y-DELAY

ADJ.

MODE

↓

Y-D TIME FOR PAL (TV) (DL-PT)

↓

Y-D TIME FOR SECAM (TV) (DL-ST)

↓

Y-D TIME FOR N358 (TV) (DL-3T)

↓

Y-D TIME FOR N443 (TV) (DL-4T)

↓

Y-D TIME FOR B/W (TV) (DL-TV)

↓

Y-D TIME FOR PAL (AV) (DL-PA)

↓

Y-D TIME FOR SECAM (AV) (DL-SA)

↓

Y-D TIME FOR N358 (AV) (DL-3A)

↓

Y-D TIME FOR N443(AV) (DL-4A)

↓

Y-D TIME FOR B/W (AV) (DL-AV)

*(Y-D : Y-DELAY)

OFFSET

ADJ.

MODE

↓

COLOUR OFFSET (PAL) (COL-OP)

↓

COLOUR OFFSET (SECAM) (COL-OS)

↓

COLOUR OFFSET (NTSC358) (COL-O3)

↓

COLOUR OFFSET (NTSC443) (COL-O4)

↓

SHARPNESS OFFSET (PAL) (SHP-OP)

↓

SHARPNESS OFFSET (SECAM) (SHP-OS)

↓

SHARPNESS OFFSET (NTSC358) (SHP-O3)

↓

SHARPNESS OFFSET (NTSC443) (SHP-O4)

OPTION

MODE

↓

VERTICAL SCAN DISABLE(VSD)

↓

BLACK STRETCH (BKS)

↓

AUTO VOLUME LEVELING(AVL)

↓

FAST FILTER IF-PLL(FFI)

↓

ENABLE VERTICAL GUARD (EVG)

↓

EHT TRACKING MODE (EHT)

↓

OVERSCAN SWITCH OFF(OSO)

↓

AUTO COLOUR LIMIT(ACL)

↓

FORCED COLOUR LIMIT(FCO)

MISC.

OPTION

MODE

↓

SOUND SYSTEM M (S-M)

↓

SOUND SYSTEM DK (S-DK)

↓

SOUND SYSTEM I (S-I)

↓

SOUND SYSTEM BG (S-BG)

↓

PLAYBACK SECAM (P-SECAM)

↓

FE (RF) NTSC 3.58 (F-N358)

↓

FE (RF) NTSC 4.43 (F-N443)

↓

FE (RF) SECAM (F-SECAM)

↓

VIDEO MUTE AT IDENT LOSS (VMI)

↓

VIDEO MUTE AT PROGRAM

/SOURCE CHANGE (VMC)

↓

HOTEL MODE (HTL)

↓

REDUCED FM DEMODULATION

GAIN FOR BTSC SIGNAL (BTSC)

↓

NUMBER OF EXTAV SOURCE (AV)

↓

FM WINDOW SEVECTION (FMWS)

↓

SOUND MUTE BIT 0 (SM0)

↓

SOUND MUTE BIT 1 (SM1)

↓

THAI LANGUAGE (THA)

↓

ARABIC LANGUAGE (ARA)

↓

MALAY LANGUAGE (MAL)

↓

CHINESE LANGUAGE (CHI)

↓

FRENCH LANGUAGE (FRE)

↓

RUSSIAN LANGUAGE (RUS)

↓

FORCED V-SYNC SLICING LEVEL(FSL)

↓

SYNC OF OSD (HP2)

↓

TUNER CPT (CPT)

↓

BILINGUAL(BIL)

↓

IF AGC SPEED BIT 0 (AGC0)

↓

IF AGC SPEED BIT 1 (AGC1)

↓

FOATime Constant-RF (FOA-FE)

↓

FOB Time Constant-RF (FOB-FE)

↓

FOATime Constant-AV (FOA-AV)

↓

FOB Time Constant-AV (FOB-AV)

14GT15

14GT20

RC COMMAND SERVICE-ITEM

FUNCTION AGC

CONTRAST DOWN V-LIN

COLOUR DOWN V-AMP

BRIGHTNESS DOWN V-CENT

TINT DOWN H-CENT

SHARPNESS DOWN EW / /

SYSTEM HB

BLUEBACK S-COR

TIMER SUB-VOL

CONTRAST UP SUB-CON

COLOUR UP SUB-COL

BRIGHTNESS UP SUB-BRI

TINT UP TINT SUB TINT

SHARPNESS UP SUB-SHP

CHANNEL 1 DRI-GS

CHANNEL 4 DRI-BS

CHANNEL 7 CUT-R

CHANNEL FLASH BACK CUT-G

USER DATA IN SERVICE MODE

The flow of Mode lists as following,

* Direct Key-in Step1 Mode

14GT15

14GT20

EEPROM ITEMS OSD DATA LENGTH

INITIAL DATA

FIX/ADJ REMARK

AGC TAKE OVER POINT AGC 0~63 14 ADJ

VERTICAL SLOPE V-LIN 0~63 32 ADJ

VERTICAL AMPLITUDE V-AMP 0~63 32 ADJ

VERTICAL SHIFT V-CENT 0~63 32 ADJ

HORIZONTAL SHIFT H-CENT 0~63 32 ADJ

S-CORRECTION S-COR 0~63 0 FIX

WHITE POINT RED STD WHITE TEMP DRI-RS 0~63 32 FIX

WHITE POINT GREEN STD WHITE TEMP DRI-GS 0~63 32 ADJ

WHITE POINT BLUE STD WHITE TEMP DRI-BS 0~63 32 ADJ

WHITE POINT RED WARM WHITE TEMP DRI-RW 0~63 32 FIX

WHITE POINT GREEN WARM WHITE TEMP DRI-GW 0~63 32 FIX (DRI-GS)-7 DATA

WHITE POINT BLUE WARM WHITE TEMP DRI-BW 0~63 32 FIX (DRI-BS)-7 DATA

WHITE POINT RED COOL WHITE TEMP DRI-RC 0~63 25 FIX

WHITE POINT GREEN COOL WHITE TEMP DRI-GC 0~63 32 FIX (DRI-GS)-7 DATA

WHITE POINT BLUE COOL WHITE TEMP DRI-BC 0~63 32 FIX

(DRI-BS)SAME DATA

MAX VOLUME SUB-VOL 0~63 63 FIX

SUB CONTRAST SUB-CON 0~63 63 FIX

SUB COLOUR SUB-COL 0~63 32 ADJ

SUB BRIGHTNESS SUB-BRI 0~63 32 ADJ

SUB TINT SUB-TINT 0~63 32 ADJ

SUB SHARPNESS SUB-SHP 0~63 32 ADJ

MAX HOTEL VOLUME HTL-VOL 0~63 32 ADJ

HOTEL PROGRAM NUMBER HTL-PRG

0~99 OR>99FOR NONE

255 FIX

OSD GRB REFERENCE RGB 0~15 15 FIX

BLACK LEVEL OFF-SET R CUT-R 0~15 8 FIX

BLACK LEVEL OFF-SET G CUT-G 0~15 8 FIX

CATHODE DRIVE LEVEL CDL 0~15 0 FIX

Y-DELAY TIME FOR PAL(TV) [YD] DL-PT 0~15 12 FIX

Y-DELAY TIME FOR SECAM(TV) [YD] DL-ST 0~15 15 FIX

Y-DELAY TIME FOR N358 (TV) [YD] DL-3T 0~15 12 FIX

Y-DELAY TIME FOR N443 (TV) [YD] DL-4T 0~15 12 FIX

Y-DELAY TIME FOR B/W (TV) [YD] DL-TV 0~15 12 FIX

Y-DELAY TIME FOR PAL (AV) [YD] DL-PA 0~15 12 FIX

Y-DELAY TIME FOR SECAM (AV) [YD] DL-SA 0~15 15 FIX

Y-DELAY TIME FOR N358 (AV) [YD] DL-3A 0~15 12 FIX

Y-DELAY TIME FOR N443 (AV) [YD] DL-4A 0~15 12 FIX

Y-DELAY TIME FOR B/W (AV) [YD] DL-AV 0~15 12 FIX

COLOUR OFFSET (PAL) COL-OP 0~15 8 FIX

COLOUR OFFSET (SECAM) COL-OS 0~15 8 FIX

COLOUR OFFSET (NTSC358) COL-03 0~15 4 FIX

COLOUR OFFSET (NTSC443) COL-O4 0~15 4 FIX

SHARPNESS OFFSET (PAL) SHP-OP 0~15 8 FIX

SHARPNESS OFFSET (SECAM) SHP-OS 0~15 4 FIX

SHARPNESS OFFSET (NTSC358) SHP-O3 0~15 12 FIX

SHARPNESS OFFSET (NTSC443) SHP-O4 0~15 8 FIX

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

00H : 55H 02H : 43H

01H : 4FH 03H : A1H

14GT15

14GT20

EEPROM ITEMS OSD DATA LENGTH

INITIAL DATA

FIX/ADJ REMARK

VERTICAL SCAN DISABLE VSD

0(DISABLE)/1(ENABLE)

0 FIX

BLACK STRETCH BKS

0(DISABLE)/1(ENABLE)

1 FIX

AUTOMATIC VOLUME LEVELING AVL

0(DISABLE)/1(ENABLE)

1 FIX

FAST FILTER IF-PLL FFI

0(DISABLE)/1(ENABLE)

0 FIX

ENABLE VERTICAL GUARD (RGB BLANKING)

EVG

0(DISABLE)/1(ENABLE)

1 FIX ONLY BLK

EHT TRACKING MODE (HCO) EHT

0(DISABLE)/1(ENABLE)

1 FIX

OVERSCAN SWITCH OFF OSO

0(DISABLE)/1(ENABLE)

0 FIX

AUTO COLOUR LIMIT ACL

0(DISABLE)/1(ENABLE)

0 FIX

FORCED COLOUR LIMIT FCO

0(DISABLE)/1(ENABLE)

0 FIX

SOUND SYSTEM M S-M

0(DISABLE)/1(ENABLE)

0 FIX

SOUND SYSTEM DK S-DK

0(DISABLE)/1(ENABLE)

1 FIX *1

SOUND SYSTEM I S-I

0(DISABLE)/1(ENABLE)

1 FIX *1

SOUND SYSTEM BG S-BG

0(DISABLE)/1(ENABLE)

1 FIX

PLAYBACK SECAM P-SECAM

0(DISABLE)/1(ENABLE)

1 FIX *1

FE (RF) NTSC 3.58 F-N358

0(DISABLE)/1(ENABLE)

0 FIX

FE (RF) NTSC 4.43 F-N443

0(DISABLE)/1(ENABLE)

1 FIX *1

FE (RF) SECAM F-SECAM

0(DISABLE)/1(ENABLE)

1 FIX *1

VIDEO MUTE AT IDENT LOSS VMI

0(DISABLE)/1(ENABLE)

1 FIX

VIDEO MUTEAT PROGRAM/SOURCE CHANGE

VMC

0(DISABLE)/1(ENABLE)

1 FIX

HOTEL MODE HTL

0(DISABLE)/1(ENABLE)

0 FIX

REDUCED FM DEMODULATOR GAIN FOR BTSC SIGNAL

BTSC

0(DISABLE)/1(ENABLE)

0 FIX

NUMBER OF EXTERNALAV SOURCE AV

0 FOR1 AV/1 FOR 2AV

1 FIX *2

FM WINDOW SELECTION FMWS

0(DISABLE)/1(ENABLE)

0 FIX

SOUND MUTE BIT 0 SM0

0(DISABLE)/1(ENABLE)

1 FIX

SOUND MUTE BIT 1 SM1

0(DISABLE)/1(ENABLE)

0 FIX

THAI LANGUAGE THA

0(DISABLE)/1(ENABLE)

0 FIX *3

ARABIC LANGUAGE ARA

0(DISABLE)/1(ENABLE)

1 FIX *4

MALAY LANGUAGE MAL

0(DISABLE)/1(ENABLE)

1 FIX *4

CHINESE LANGUAGE CHI

0(DISABLE)/1(ENABLE)

1 FIX *4

FRENCH LANGUAGE FRE

0(DISABLE)/1(ENABLE)

1 FIX *4

RUSSIAN LANGUAGE RUS

0(DISABLE)/1(ENABLE)

1 FIX *4

FORCED V-SYNC SLICING LEVEL FSL

0(DISABLE)/1(ENABLE)

0 FIX

SYNC OF OSD HP2

0(DISABLE)/1(ENABLE)

0 FIX

TUNER CPT CPT

0(BRAZIL)/1(ARGENTINA)

0 FIX

BILINGUAL BIL

0(DISABLE)/1(ENABLE)

0 FIX

IF AGC SPEED BIT 0 AGC0

0(DISABLE)/1(ENABLE)

1 FIX

IF AGC SPEED BIT 1 AGC1

0(DISABLE)/1(ENABLE)

0 FIX

PHI-1 TIME CONSTANT (RF) FOA-FE

0(DISABLE)/1(ENABLE)

0 FIX

PHI-1 TIME CONSTANT (RF) FOB-FE

0(DISABLE)/1(ENABLE)

0 FIX

PHI-1 TIME CONSTANT (OFF AIR) FOA-AV

0(DISABLE)/1(ENABLE)

1 FIX

PHI-1 TIME CONSTANT (OFF AIR) FOB-AV

0(DISABLE)/1(ENABLE)

1 FIX

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.

14GT15

14GT20

SHIPPING SETTING & CHECKING

(1) The following default data has been factory-set for the E2PROM.

ITEMS DATA SETTING

LAST PROGRAM/CHANNEL 1

FLASHBACK PROGARM/CH 1

DIGIT 1

C-SYSTEM AUTO

S-SYSTEM B/G

SKIP OFF

AFC ON

VOLUME 1

CONTRAST 60 (MAX)

COLOUR 0 (CENTER)

BRIGHTNESS 0 (CENTER)

TINT 0 (CENTER)

SHARPNESS 0 (CENTER)

WHITE TEMP STANDARD

REMINDER TIMER In-active, "--:--"

ON TIMER In-active, "--:--"

OFF TIMER In-active, "--:--"

LAST POWER POWER-ON

LANGUAGE ENGLISH

BLUE BACK MUTE OFF

HOTEL MODE OFF

0 CHANNEL SKIP ON

AFTER PRESSING MODEL SETTING, 0 CHANNEL WILL BE SKIPPED.

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