SERVICE MANUAL
COLOUR TELEVISION
Chassis No. GA-8S
MODEL :
21ES251E
21ES253E
21ES353E
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
Multi 21 System, 100-CH Program Memory
¨
¨
Full Auto Search System
¨
NTSC Colour Comb Filter
¨
CATV (Hyperband) Ready
¨
NTSC Colour Comb Filter Function
High Contrast Picture (Black Strecth Circuit)
¨
White Temperature Select
¨
¨
English Language OSD
¨SPECIFICATIONS .............................................2
¨IMPORTANT SERVICE NOTES ........................ 2
¨ADJUSTMENT PRECAUTIONS ........................ 3
¨TROUBLE SHOOTING TABLE ....................... 16
¨WAVEFORMS.................................................. 18
¨SOLID STATE DEVICE BASE DIAGRAM ....... 19
¨DESCRIPTION OF SCHEMATIC DIAGRAM .. 20
¨ DIAGRAM:
¨DIAGRAM BLOCK CRT ............................. 21
¨DIAGRAM SCHEMATIC CRT ..................... 22
¨
¨
¨
¨
¨
¨
¨
¨
CONTENTS
Page
Blueback Function Noise Mute
OFF Timer & Child Lock
Hotel Mode & AV Mode (Movie/Music/News)
Surround Sound Effect
Rear AV-IN Terminal
Rear AV-OUT Terminal
Save Mode
AV Stereo & Equalizer
Page
¨MAIN BLOCK ........................................... 23
¨MAIN SCHEMATIC ................................... 24
¨REPLACEMENT PARTS LIST
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
1
IMPORTANT SERVICE NOTES
1.0kV (at
±
A) for the set.
A) in the case of the set. The set has been factory - Adjusted to the above-
m
m
never forget to check for such high voltage after the work.
\\
\\
the high voltage completely.
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
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
(at beam 0
hazardous radiation with prolonged exposure at close range, the following
precautions should be observed:
1. When repairing the circuit, be sure not to increase the high voltage to more than 26.0kV
\ If there is a possibility that the high voltage fluctuates as a result of the repairs,
beam 1000
mentioned high voltage.
2. To keep the set in a normal operation , be sure to make it function on 23.0kV
cause excess X-ray radiation.
3. Do not substitute a picture tube with unauthorizerd types and/or brands which may
BEFORE RETURNING THE RECEIVER
lodged between the chassis and other metal parts in the receiver .
cabinet backs, adjustment and compartment covers or shields, isolation resistor- ca-
pacity networks, mechanical insulators etc.
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
2. Inspect all protective devices such as non-metallic control knobs, insulating fishpapers,
SPECIFICATIONS
2
88W
at 400 Hz
Elliptic (2pcs)
16 ohms
Electro-Static Focusing
6cm
x
C1(49.75MHz) thru C12(216.25 MHz)
S1(105.25MHz) thru S41(463.25HMz)
PAL I, B/G, D/K & SECAM B/G, D/K, K1,
.
& NTSC M
Width: 597mm
Depth: 341.5 mm
Height: 468.5mm
Weight(approx): 19.5kg
C13(471.25MHz) thru C57(863.25MHz)
2-1 2-2
............................................................................................................. 3.0W(rms)x
........................................................................................................................................
.......................................................................................................................
Convergence ................................................................................................................ Self Convergence System
Focus
Sweep Deflection .........................................................................................................................................Magnetic
6.5MHz ............................................................................................................................................. 32.4MHz
6.0MHz ............................................................................................................................................. 32.9MHz
5.5MHz ............................................................................................................................................. 33.4MHz
Picture IF Carrier ................................................................................................................................. 38.9MHz
Intermediate Frequencies
Colour Sub-Carrier Frequency........................................................................................................... 34.47MHz
Sound IF Carrier Frequency
Power Input ..................................................................................................................... 110 ~ 240V AC 50/60 Hz
Power Consumption
Audio Power Output Rating
.............................................................................................................
.....................................................................................................................................
.................................................................................................................. ....12cm
Size
Voice Coil Impedance
Speaker
VHF/UHF .......................................................................................................................... 75 ohms Unbalanced
Receiving System ...................................................................................
Aerial Input Impedance
UHF-Channels ..................................................................................... E21(471.25MHz) thru E69(855.25MHz)
VHF-Channels ......................................................................................... E2(48.25MHz) thru E12(224.25MHz)
Receiving Channel
Dimensions
Specifications are subject to change without prior notice
Cabinet material ..................................................................................................................................... All Plastics
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.
CAUTION : MAKE SURE TV SET IN "NORMAL CONDITION" BEFORE SWITCH TO SERVICE MODE
1. Setting the service mode by the microprocessor.
(1) Press SERVICE key on the remote controller to set the TV set to SERVICE mode position,
and the microprocessor is in input mode. (Adjustment through the I2C bus control).
Service Mode also can be reached by by connecting MCU Pin 5 to ground.
(2) Press the MENU key on the remote controller to get ready to select the mode
(Adjustment mode, Setting mode, Check mode, Option mode and NVM Edit mode ) one by one.
(3) Press the CH DOWN / UP key on the remote controller to select the item in Adjustment
mode, Setting mode, Option mode or NVM Edit mode.
(4) Using the VOLUME UP/ DOWN key on the remote controller, the data can be modified.
Please wait approximately 200 msec for data storage in EEPROM before select to
another mode.
(5) In Check mode the data cannot be changed.
(6) Press the SERVICE key again, it will switch to the NORMAL mode position, and the
microprocessor is out of the SERVICE mode.
2. Factory Presetting.
(1) During POWER OFF (AC OFF), switch on service key (by connecting MCU Pin 5 to ground )
after raster appeared on the screen. Initial values are automatically preset, only when
then follow by AC ON. 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 6~10.
(3) Make sure the data need modification or not (Initial data).
Precaution: If haven't done this initialization, it may possibly generate excessive Beam current.
3.
For reference please check with memory map RH-IXC688WJZZQ (see attachment)
***Below are the adjustment items that should be done, PLS FOLLOW THE PROCEDURE.
Otherwise some adjustment items will not be accurate.
NO *** REVISION
1 BUS SET UP
2 RF-AGC
3 FOCUS ADJ
4 H-VCO ADJ
5 VIF-VCO ADJ
6 S-TRAP ADJ
7 V-SHIFT
8 V-SIZE
9 V-LINEARITY
10 VS CORRECTION
11 H-SHIFT
12 H-SIZE
13 PARABOLA
14 UPPER CORNER
15 LOWER CORNER
16 BOW-ADJ
17 ANGLE ADJ
18 TRAPEZIUM
19 SCREEN
20 WHITE BALANCE
21 SUB-BRIGHTNESS
22 SUB-CONTRAST
23 BEAM CURRENT CHECK
24 SUB-COLOR
25 SUB-TINT
26 SECAM-OFFSET
27 BEAM PROTECTOR CHECK
28 HV PROTECTOR CHECK
29 OTHER PROTECTOR CHECK
30 AV OUT CHECK
31 AV IN CHECK
32 COMPONENT IN CHECK
33 SUB-WOOFER CHECK
34 CONTRAST CONTROL CHECK
35 COLOR CONTROL CHECK
36 BRIGHTNESS CONTROL CHECK
37 TINT CONTROL CHECK
38 SHARPNESS CONTROL CHECK
39 CH DISPLAY COLOR CHECK
40 SURROUND CHECK
41 BALANCE CHECK
42 EQUALIZER CHECK
43 COLOR TEMP CHECK
44 NORMAL DISPLAY CHECK
45 COLOUR SYSTEM CHECK
46 SOUND SYSTEM CHECK
47 NOISE MUTE CHECK
48 OSD LANGUAGE QUANTITY CHECK
49 SHOCK TEST CHECK
3-2
3-1
4-2
USER DATA IN SERVICE MODE
. While SERVICE mode ON, EEPROM DATA will switch to the service data.
Also, once SERVICE mode OFF, EEPROM will switch back to previous USER DATA.
. In the service mode, the user data establish as below,
USER DATA MODELS
CONTRAST MAX 60
COLOUR CENT 0
BRIGHTNESS CENT 0
TINT CENT 0
SHARPNESS CENT 0
WHITE TEMP STANDARD
S-VOLUME MIN
SURROUND OFF
BALANCE CENT 0
AVL *2
BLUE BACK OFF
C SYSTEM AUTO
S SYSTEM *1
EQUALIZER *2
*1: For each CH, data is same as before switch to Service mode.
*2: Data is same as before switch to Serice mode.
The flow of Mode list as following,
* Direct Key-in Mode for Service Items in Service Mode
RC CODE (HEX) R/C KEY NAME
80 POS 1 R-C UP (IN SERVICE MODE V00)
40 POS 2 G-C UP (IN SERVICE MODE V00)
C0 POS 3 B-C UP (IN SERVICE MODE V00)
20 POS 4 R-C DOWN (IN SERVICE MODE V00)
A0 POS 5 G-C DOWN (IN SERVICE MODE V00)
60 POS 6 B-C DOWN (IN SERVICE MODE V00)
E0 POS 7 R-D UP (IN SERVICE MODE V00)
10 POS 8 B-D UP (IN SERVICE MODE V00)
50 POS 0 B-D DOWN (IN SERVICE MODE V00)
E4 FLASHBACK R-D DOWN (IN SERVICE MODE V00)
E4 FLASHBACK Y-MUTE (BESIDES OF SERVICE MODE V00)
75 WHITE TEMP UP RF-AGC (V01)
F5 WHITE TEMP DOWN VIF-VC0 (V02)
C2 TUNE DOWN H-VCO (V03)
8D SHARPNESS DOWN SUB-CON (V04)
D6 BALANCE LEFT SUB-COL (V05)
0D SHARPNESS UP SUB-BRIGHT (V06)
36 BALANCE RIGHT SUB-TINT (V07)
46 TREBLE UP SUB-SHP-PRE (V08)
C6 TREBLE DOWN SUB-COL-YUV (V09)
26 BASS UP SUB-TINT-YUV (V10)
24 COLOUR UP V-SIZE (V11), V-SIZE60 (V16)
54 BRIGHTNESS DOWN V-SHIFT (V12), V-SHIFT60 (V17)
74 TINT DOWN H-SHIFT (V13), H-SHIFT60 (V18)
66 SURROUND UP SCM-BR (V14)
E6 SURROUND DOWN SCM-BB (V15)
C4 CONTRAST DOWN SUB-VOL
4C PICTURE S-TRAP-BG (V19)
CC HOLD S-TRAP-I (V20)
2C TEXT S-TRAP-DK (V21)
AC CANCEL S-TRAP-M (V22)
EC SIZE S-TRAP-574 (V23)
C1 AUTO ADJ FOR V01, V02, V03,V19, V20, V21, V22, V23
CA T-SET
81 SERVICE MODE
1.) Please set the MCL to
MCL1
as below:
2.) After set the MCL , please set the INITIAL SETTING for each models
.
All Channel Sound System are set to B/G
CH-No Fv (MHz) Sound Sys
45 175.55 B/G464748495051525354555657585960616263646566676869
4-1
5-2
SHIPPING SETTING & CHECKING
(1) The following default data has been factory-set for the E2PROM follow by INITIAL DATA selected.
ITEMS DATA SETTING
LAST POWER ON
LAST TV/AV MODE TV MODE
LAST POSITION CH 1
FLASHBACK CHANNEL CH 1
1/2 DIGIT ENTRY 2 DIGIT ENTRY
VOLUME 0 (Min)
BLUE BACK OFF
CHILD LOCK OFF
OFF TIMER --:--
PASSWORD 0000
AFT ALL CH ON
COLOR SYSTEM ALL CH AUTO
SKIP ALL CH OFF
FAVORITE PROGRAM A CH 10
FAVORITE PROGRAM B CH 20
FAVORITE PROGRAM C CH 30
FAVORITE PROGRAM D CH 40
AV MODE MOVIE
CONTRAST 60
COLOR +3
BRIGHTNESS 0
TINT 0(CENTER)
SHARPNESS +3
PICTURE NR OFF
WHITE TEMP 0
SURROUND OFF
AVL ON
BALANCE 0(CENTER)
SAVE MODE
OFF
BOOSTER
ALL CH OFF
INITIAL LANGUAGE SOUND SYSTEM
(Reference: Geomagnetism Adjustment)
MODEL MAGNETIC FIELD(V, H) nT BACKGROUND LANG. S-SYS LANG QTY
INDONESIA -20,000 40,000 12300°K ENGLISH B/G 1
1: ENGLISH
**AFTER INITIALIZED THE EEPROM (REFER TO FACTORY PRESETTING), READ DATA FROM
EEPROM ADDRESS 00H ~ 03H,AND COMPARE TO THE LIST BELOW, IF DIFFERENT,
INITIALIZE THE EEPROM.
ADDRESS DATA ADDRESS DATA
00H:
*** There are four stages of service mode data. First stage data from V00~V45 (Adjustment Mode).
To go into second stage of service mode data, press MENU key.Second stage data from F01~F170(Setting Mode).
To go into third stage of service mode data, press MENU key.Third stage data is Check Mode.
To go into fourth stage of service mode data, press MENU key.Fourth stage data from O01~O35 (Option Mode).
V00 0…127 63 63
ADJ
V00 0…127 63 63
ADJ
V00 0…255 127 127
ADJ
V00 0…255 127 127
ADJ
V00 0…255 127 127
ADJ
V01 0…127 50 50
AUTO
V02 0…63 31 31
AUTO
V03 0…7 3 3
AUTO
V04 0…127 100 100
ADJ
V05 0…127 63 63
ADJ
V06 0…255 127 127
ADJ
V07 0…127 63 63
ADJ
V08 0…63 37 28
*FIX
V09 0…127 49 49
FIX
V10 0…127 61 61
FIX
V11 0…63 38 38
ADJ
V12 0…7 3 3
ADJ
V13 0…31 9 9
ADJ
V14 0…63 37 37
ADJ
V15 0…63 22 22
ADJ
V16 -31…0…+31 +6 +6
FIX
V17 -7…0…+7 -2 -2
FIX
V18 -15…0…+15 +2 +2
FIX
V19 0…127 64 64
V20 0…127 64 64
AUTO
V21 0…127 64 64
AUTO
V22 0…127 64 64
AUTO
V23 0…127 64 64
AUTO
V24
0…15 0 0
FIX
V25 0…127 25 25
FIX
V26 0…127 95 95
FIX
V27 0…63 38 38
*FIX
V28 -13…+13 -9 -9
FIX
V29 0…63 36 36
*FIX
V30 -13…+13 +3 +3
FIX
V31 0…63 26 26
FIX
V32 0…63 32 32
ADJ
V33 -13…+13 0 0
FIX
V34 0…63 32 32
ADJ
V35 -13…+13 0 0
FIX
V36 0…63 32 32
ADJ
V37 -13…+13 0 0
FIX
V38 0…63 32 32
ADJ
V39 -13…+13 0 0
FIX
V40 0…63 32 32
ADJ
V41 -13…+13 0 0
FIX
V42 0…63 32 32
ADJ
V43 -13…+13 0 0
FIX
V44 0…63 32 32
ADJ
V45 -13…+13 0 0
H-SHIFT60
S-TRAP ADJ Stop
Adjustment Mode (First Stage)
PLS REFER ADJ ITEM FOR
SCREEN AND WHITE
BALANCE
5-1
Data OPTION FUNCTION Description Range Default Data 21DXS200
O01 ***HTL OFF/ON 0/1 0 0
O02 ***HTL-POS Pos-No,Nil 0…99,-- -- --
O03 ***HTL-VOL Vol-Lvl, Nil 0…60,-- -- --
O04 HTL-MENU KEY Dis/Ena MENU key in HTL mode 0/1 1 1
O05 COL-SYSTEM
0: PAL only
1: 18-system
2: 21-system
0…2 2 2
O06 Force-Col Dis/Ena 0/1 0 0
O07 S-SYS M/DK/I/BG 1…15 15 15
O08 AV
0: No AV
1: AV
2: AV1/AV2
0…2 2 2
0 : without COMPONENT
1 : COMPONENT (share with AV1)
2 : COMPONENT (individual)
0 : without SOUND-MENU
1 : TONE
2 : EQUALIZER
0…2 2 2
O11 BIL Dis/Ena 0/1 0 0
*/*/A/M/R/F/*/E 1…255 61
*/V/*/M/*/F/C/E 1…255 87
*/*/*/*/*/*/T/E 1…255 3
O13 SERCH-SP 350/450/550/650/750 1…5 3 5
O14 R/C-MENU Ena/Dis 0/1 0 0
O15 LED-CONT One LED/ Two LEDs 0/1 0 0
O16
0: No S-BOOSTER
1: Using DAC IC
2: Using PWM port
0…2 0 0
O17 VOL CURVE Dis/Ena 0/1 0 1
O18
**TUNER BAND Refer to Table 1 0/1 0 0
WHITE BACK Dis/Ena 0/1 1 0
O20 BOOSTER Dis/Ena 0/1 0 1
O21
0 : 100 channels(8k EEPROM)
1 : 250 channels(16k EEPROM)
Option Mode (Fourth stage)
0 : fix to 0
1 : fix to 1
2 : AVL in SOUND MENU
LNA TUNER
0 : ALPS
1 : MATSUSHITA
0/1 0 1
Set items to default for
0 : Picture and Sound
1 : Picture only
VIRGIN-MODE Dis/Ena 0/1 0 0
WHITE-TEMP
0 : 3 modes
1 : 5 modes
0/1 0 0
ARROW-KEY
0 : CH
△
/
▽
, VOL+/-
1 : /, /º%
0/1 1 1
0 : 7-bit volume table
1 : 8-bit volume table
0: No GLARE/SAVE MODE
1: GLARE MODE
2: SAVE MODE
0 : 5-language(E/M/F/R/A)
1 : Vietnam(E/M/F/C/V)
0 : (-105~0) contrast table
1 : (-60~0) contrast table
2: (-30 ~ 0) contrast table
0: (-60 ~ +60) brightness table
1: (-30 ~ +30) brightness table
0/1 0 0
*** HOTEL MODE
OPERATION OF HOTEL MODE:
WHEN CHANGE SERVICE DATA O01 TO 1, HOTEL MODE IS ON
WHEN HOTEL MODE IS ON,
1. Max volume data is determined by option setting HTL-VOL (O03)
2. Channel position after POWER ON is determined by option setting HOTEL-POS (O02) (if option setting
HOTEL-POS is not set, processing is according to last position data).
3. User data updates of EEPROM regarding the video and audio control is not allowed.
4. Preset mode is disable.
5. CH SETTING menu is not available.
TUNER BAND = 0 (same as GA6)
VHF-L (0001)
VHF-H (0010)
8-1 8-2