SHARP 14T1-L Diagram
14T1-L
TV14T1-LService Manual14T1-LMarketE
CHAPTER 1. IMPORTANT SERVICE SAFETY PRECAUTION
[1] IMPORTANT SERVICE SAFETY PRECAUTION
IMPORTANT SERVICE SAFETY PRECAUTION
Service work should be performed only by qualified service technicians who are
thoroughly familiar with all safety checks and the servicing guidelines which follow:
WARNING
1. For continued safety, no modification of any circuit
should be attempted.
2. Disconnect AC power before servicing.
3. Semiconductor heat sinks are potential shock
hazards when the chassis is operating.
4. The chassis in this receiver has two ground systems
which are separated by insulating material. The nonisolated (hot) ground system is for the B+ voltage
regulator circuit and the horizontal output circuit. The
isolated ground system is for the low B+ DC voltages
and the secondary circuit of the high voltage
transformer.
To prevent electrical shock use an isolation
transformer between the line cord and power
receptacle, when servicing this chassis.
SERVICING OF HIGH VOLTAGE SYSTEM
AND PICTURE TUBE
When servicing the high voltage system,
remove the static charge by connecting a
10k ohm resistor in series with an insulated
wire (such as a test probe) between the picture tube ground and the 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 anode completely.
X-RADIATION AND HIGH VOLTAGE LIMITS
1. Be sure all service personnel are aware of the
procedures and instructions covering X-radiation.
The only potential source of X-ray in current solid
state TV receivers is the picture tube. However, the
picture tube does not emit measurable X-Ray
radiation, if the high voltage is as specified in the
"High Voltage Check" instructions.
It is only when high voltage is excessive that Xradiation is capable of penetrating the shell of the
picture tube including the lead in the glass material.
The important precaution is to keep the high voltage
below the maximum level specified.
2. It is essential that servicemen have available at all
times an accurate high voltage meter.
The calibration of this meter should be checked
periodically.
3. High voltage should always be kept at the rated value
−no higher. Operation at higher voltages may cause
a failure of the picture tube or high voltage circuitry
and;also, under certain conditions, may produce
radiation in exceeding of desirable levels.
4. When the high voltage regulator is operating properly
there is no possibility of an X-radiation problem.
Every time a color chassis is serviced, the brightness
should be tested while monitoring the high voltage
with a meter to be certain that the high voltage does
not exceed the specified value and that it is regulating
correctly.
5. Do not use a picture tube other than that specified
or make unrecommended circuit modifications to the
high voltage circuitry.
6. When trouble shooting and taking test
measurements on a receiver with excessive high
voltage, avoid being unnecessarily close to the
receiver.
Do not operate the receiver longer than is necessary
to locate the cause of excessive voltage.
1 – 1
IMPORTANT SERVICE SAFETY PRECAUTION
(Continued)
BEFORE RETURNING THE RECEIVER
(Fire & Shock Hazard)
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 materials, cabinet backs,
adjustment and compartment covers or shields,
isolation resistor-capacity networks, mechanical
insulators, etc.
3. To be sure that no shock hazard exists, check for
leakage current in the following manner.
•
Plug the AC cord directly into a 110~220 volt AC
outlet, (Do not use an isolation transformer for this
test).
•
Using two clip leads, connect a 1.5k ohm, 10 watt
resistor paralleled by a 0.15µF capacitor in series
with all exposed metal cabinet parts and a known
earth ground, such as electrical conduit or electrical
ground connected to earth ground.
•
Use an AC voltmeter having with 5000 ohm per volt,
or higher, sensitivity to measure the AC voltage drop
across the resistor.
•
Connect the resistor connection to all exposed metal
parts having a return to the chassis (antenna, metal
cabinet, screw heads, knobs and control shafts,
escutcheon, etc.) and measure the AC voltage drop
across the resistor.
AII checks must be repeated with the AC line cord
plug connection reversed. (If necessary, a nonpolarized adapter plug must be used only for the
purpose of completing these check.)
Any current measured must not exceed 0.5 milliamp.
Any measurements not within the limits outlined
above indicate of a potential shock hazard and
corrective action must be taken before returning the
instrument to the customer.
DVM
AC SCALE
1.5k ohm
10W
14T1-L
SAFETY NOTICE
Many electrical and mechanical parts in television
receivers have special safety-related characteristics.
These characteristics are often not evident from visual
inspection, nor can protection afforded by them be
necessarily increased by using replacement components
rated for higher voltage, wattage, etc.
Replacement parts which have these special safety
characteristics are identified in this manual; electrical
components having such features are identified by "
and shaded areas in the Replacement Parts Lists and
Schematic Diagrams.
TO EXPOSED
METAL PARTS
For continued protection, replacement parts must be
identical to those used in the original circuit. The use of
substitute replacement parts which do not have the same
safety characteristics as the factory recommended
replacement parts shown in this service manual, may
create shock, fire, X-radiation or other hazards.
"
CONNECT TO
KNOWN EARTH
GROUND
1 – 2
14T1-L
TV14T1-LService Manual14T1-LMarketE
CHAPTER 2. LOCATION OF USER'S CONTROL
[1] LOCATION OF USER'S CONTROL
LOCATION OF USER'S CONTROL
Basic Remote Control Functions
POWER
On.
Press
Press again
FLASHBACK
Return to previous channel.
VOLUME UP/DOWN
(+) Increases sound.
(_) Decreases sound.
In menu mode, changes or selects
the TV adjustments.
MUTE
Press
Press again
Stand by..
Mutes sound.
Restores sound.
POWER
1
4
7
FLASHBACK
VOL
-
MUTE DISPLAY
CH
CH
2
5
8
0
MENU
INPUT
3
6
9
100
VOL
+
ANTENNA/CABLE
INPUT TERMINAL
Infrared Transmitter Window
INPUT
Press
Switch to external video
INPUT 1 mode..
Press 2 times Switch to external
video INPUT 2 mode.
Press 3 times Switch back to the
original TV mode.
REMOTE KEYPAD
Accesses any channel from keypad.
CHANNEL UP/DOWN
(
) Selects next higher channel.
(
) Selects next lower channel.
Moves the highlight bar of the
MENU screens.
AV OUT TERMINALS
AV-1IN/INPUT-1 TERMINALS
DISPLAY
Press Displays receiving channel
and Off Timer on the screen.
Press again Removes display.
2 – 1
TV
MENU
Press
Accesses MAIN MENU.
Press again
Exits MAIN MENU.
TV14T1-LService Manual14T1-LMarketE
CHAPTER 3. INSTALLATION AND SERVICE INSTRUCTIONS
[1] INSTALLATION AND SERVICE INSTRUCTIONS
INSTALLATION AND SERVICE INSTRUCTIONS
Note: (1) When performing any adjustments to resistor controls and transformers use non-metallic
screwdrivers or TV alignment tools.
(2) Before performing adjustments, the TV set must be on at least 15 minutes.
14T1-L
CIRCUIT PROTECTION
The receiver is protected by a 3.15A fuse (F701),
mounted on PWB-A, wired into one side of the AC
line input.
X-RADIATION PROTECTOR CIRCUIT TEST
After service has been performed on the horizontal
deflection system, high voltage system, B+ system,
test the X-Radiation protection circuit to ascertain
proper operation as follows:
1. Apply 110~220V AC using a variac transformer for
accurate input voltage.
2. Allow for warm up and adjust all customer controls
for normal picture and sound.
3. Receive a good local channel.
4. Connect a digital voltmeter to C602 +ve Terminal
and make sure that the voltmeter reads 20 ±1.1V.
5. Apply external 27V DC at C602 +VE Terminal by
using an
6. To reset the protector, unplug the AC cord and
remove external 27V DC at C602 +VE Terminal.
Now make sure that normal picture appears on the
screen.
7. If the operation of the horizontal oscillator does not
stop in step 5, the circuit must be repaired before the
set is returned to the customer.
external DC supply, TV must shut off.
HIGH VOLTAGE CHECK
High voltage is not adjustable but must be checked
to verify that the receiver is operating within safe
and efficient design limitations as specified checks
should be as follows:
1. Connect an accurate high voltage meter between
ground and anode of picture tube.
2. Operate receiver for at least 15 minutes at 110~220V
AC line voltage, with a strong air signal or a properly
tuned in test signal.
3. Enter the service mode and set Y-mute ON by using
Service R/C.
4. The voltage should be approximately 24KV (at zero
beam).
If a correct reading cannot be obtained, check circuitry
for malfunctioning components. After the voltage test,
make Y-mute off to the normal m ode.
3 – 1
14T1-L
conventional analog manner. The adjustments via the I2C bus control include preset-only items and
(c) Using the VOLUME UP/ DOWN key on the remote controller, the data can be modified.
TV14T1-LService Manual14T1-LMarketE
CHAPTER 5. ADJUSTMENT METHOD
[1] ADJUSTMENT METHOD
ADJUSTMENT PRECAUTIONS
This model's setting are adjusted in two different ways: through the I2C bus control and in the
variable data.
1. Setting the service mode by the microprocessor.
(a) Press and hold the local key "VOL DOWN" & "CH UP" and power on the main switch,
TV will enter into the SERVICE MODE. Or Key in service key of 40 (HEX) will enter the
service mode. The initial value of EEPROM are automatically preset when new EEPROM
is used. However, after the 1st time it will not be able to preset unless do the precedure
in section 2 as below.
(b) Press the CH DOWN / UP key on the remote controller to select the setting items
one by one.
(d) When press the local key "VOL DOWN" & "CH UP" at the same time or press service
key 40 (HEX), it will be released from the service mode.
2. Factory Presetting.
(1) Press remote controller key of code "B7" for 4 seconds, the initial values are
automatically preset.
(2) The initial data are preset as listed in page 2 until 7.
(3) Please modify the bus setup data.
Precaution
: If haven't done this initialization, malfunction might be happen.
3. For reference, please check with memory map RH-IXC227WJZZQ (See Attachment)
5 – 1
There is three stage of Service Mode data
Setting Data (DEC)
Item
Setting Item
Setting Range
Default
IC
First stage data from V01 ~ V35
to go into second stage of service mode data, press MENU key
Second stage data from 008 ~ 1FF
Below is the contents of these data
Adjustment Mode Items
01 RF-AGC 0…63 UOC-TV 23 23
02 V-SLOPE 0…63 UOC-TV 31 31
03 S-COR 0…63 UOC-TV 16 16
04 DRI-RS 0…63 UOC-TV 32 32
05 DRI-GS 0…63 UOC-TV 32 32
06 DRI-BS 0…63 UOC-TV 32 32
07 CUT-RS 0…63 UOC-TV 16 16
08 CUT-GS 0…63 UOC-TV 16 16
09 CUT-BS 0…63 UOC-TV 16 16
10 SUB-BRI 0…63 UOC-TV 32 32
11 SUB-CON 0…63 UOC-TV 25
12 SUB-COL 0…63 UOC-TV 10 10
13 SUB-TINT 0…63 UOC-TV 36 36
14 SUB-SHARP 0…63 UOC-TV 32 32
15 DRI-RW 0…63 UOC-TV 38 38
16 DRI-GW 0…63 UOC-TV 32 32
17 DRI-BW 0…63 UOC-TV 19 19
18 DRI-RLW 0…63 UOC-TV 33 33
19 DRI-GLW 0…63 UOC-TV 32 32
20 DRI-BLW 0…63 UOC-TV 25 25
21 DRI-RC 0…63 UOC-TV 32 32
22 DRI-GC 0…63 UOC-TV 32 32
23 DRI-BC 0…63 UOC-TV 37 37
24 DRI-RLC 0…63 UOC-TV 32 32
25 DRI-GLC 0…63 UOC-TV 32 32
26 DRI-BLC 0…63 UOC-TV 34 34
27 V-SHI-60 0…63 UOC-TV 32 32
28 V-AMP-60 0…63 UOC-TV 32 32
29 H-SHI-60 0…63 UOC-TV 45 45
30 VSD 0/1 UOC-TV 0 0
31 CUT OFF 0…63 UOC-TV 27 27
32 DCXO 0…4 UOC-TV 2 1
33 ISP MODE 0/1 UOC-TV 0 0
34 BLOC 0…15 UOC-TV 6 6
35 SUB-VOL 0…60 UOC-TV 60 60
14T1-L
45 (BUS SETUP)
5 – 2
14T1-L
ADJUSTMENT
ITEM
ADJUSTMENT
POSITION
CONTROL
PRE-ADJUST
REQUIREMENT
CONTENT
INPUT
CONDITION
OUTPUT
ADJUSTMENT
PROCEDURE
MAX - 0.1V dc
SYMBOL
RF INPUT
FIELD STRENGTH
56dBµV
(FIX)
TUNER AGC TERMINAL (JA352) OR CRT DISPLAY CONFIRMAT ION
(AT SELF ADJUSTMENT MODE)
1.GO TO SERVICE MODE
2.GO TO SERVICE DATA "RF-AGC" ITEM IN THE ADJUSTMENT, PRESS R/C TO OPERATE AUTOAGC KEY AND CONFIRM THE OK DISPLAY ON THE SCREEN .
3.BLUE DISPLAY WITH OK SIGN INDICATES T HE ADJUSTMENT IS WORKING PROPERLY.
(AT MANUAL ADJUSTMENT MODE)
[CHECKING CONFIRMATION ]
14T1-L
I2C CONTROL
BUS SET UP
US10CH HALF COLOR BAR
RF-AGC
01
STEP RANGE
0-63
HISTORY
OF REVISION
REVISED CONTENT .
MODEL NAME
1. SELECT "RF-AGC" ITEM IN THE ADJUSTMENT MODE. ADJUST THE "RF-AGC" BUS
DATA TO OBTAIN THE TUNER OUTPUT PIN DROP 0.1V~1.0V BELOW MAXIMUM
VOLTAGE.
2. CHANGE T HE ANTENNA INPUT SIGNAL TO 63~67 dBuV, AND MAKE SURE THERE IS NO
NOISE
3. CHANGE T HE ANTENNA INPUT SIGNAL TO 90~95 dBuV TO BE SURE THAT THERE IS NO
CROSS MODULATION BEAT.
5 – 3
ADJUSTMENT
ITEM
ADJUSTMENT
POSITION
CONTROL
PRE-ADJUST
REQUIREMENT
CONTENT
INPUT
CONDITION
AC 220 V, RF INPUT, ZERO MAGNETIC FIELD
CRT DISPLAY CONFIRMATION
ADJUST THE V-SLOPE BUS DATA UNTILL THE OVERSCAN BECOME AS SPECIFIED BELOW.
CAUTION:- PLEASE AGING TV MORE THAN 10 MINUTES BEFORE ADJUSTMENT.
[CHECKING CONFIRMATION ]
14T1-L
I2CCONTROL
BUS SET UP,CRT PURITY
US 4 CH LION HEAD
V-SLOPE
02
STEP RANGE
0~63
HISTORY
OF REVISION
REVISED CONTENT .
MODEL NAME
A = Outofspec
B=OK
C = Out of spec
OUTPUT
14T1-L
ADJUSTMENT
PROCEDURE
SYMBOL
5 – 4
14T1-L
ADJUSTMENT
ITEM
ADJUSTMENT
POSITION
CONTOROL
PRE-ADJUST
REQUIREMENT
INPUT
CONDITION
AC 220 V, RF INPUT, ZERO MAGNETIC FIELD
CRT DISPLAY CONFIRMATION
ADJUST V-SHIFT BUS DATA TO HAVE A MOST ACCEPTABLE VERTICAL POSITION.
THE MONOSCOPE PATTERN SHOULD BE BALANCE IN VERTICAL POSITION
[CHECKING CONFIRMATION ]
14T1-L
I2C CONTROL
BUS SET UP, CRT PURITY, V-SLOPE
US4CHLIONHEAD(MONOSCOPEPATTERN)
V-SHIFT-60
27
STEP RANGE
0-63
HISTORY
OFREVISION
REVISED CONTENT .
MODEL NAME
CONTENT
OUTPUT
ADJUSTMENT
PROCEDURE
SYMBOL
5 – 5
ADJUSTMENT
ITEM
ADJUSTMENT
POSITION
CONTROL
PRE-ADJUST
REQUIREMENT
CONTENT
INPUT
CONDITION
ADJUST THE V-AMP-60 BUS DATA UNTILL THE OVERSCAN BECOME AS SPECIFIED BELOW .
[CHECKING CONFIRMATION ]
OVERSCAN 10 ± 2.5%
HISTORY
OF REVISION
REVISED CONTENT .
BUS SET UP,CRT PURITY, V-SLOPE, V-SHIFT 60
US 4 CH LION HEAD (MONOSCOPE PATTERN)
AC 220 V, RF INPUT, ZERO MAGNETIC FIELD
CRT DISPLAY CONFIRMATION
28
STEP RANGE
0~63
I2C CONTROL
MODEL NAME
14T1-L
V-AMP-60
OUTPUT
14T1-L
ADJUSTMENT
PROCEDURE
SYMBOL
5 – 6
14T1-L
ADJUSTMENT
ITEM
ADJUSTMENT
POSITION
CONTROL
PRE-ADJUST
REQUIREMENT
INPUT
CONDITION
I2C BUS CONTROL
BUS SET UP,CRT-PURITY
MODEL NAME
H-SHIFT-60
STEP RANGE
29
0-63
14T1-L
AC 220 V, RF INPUT, ZERO MAGNETIC FIELD
1.ADJUST THE
H-SHIFT
BUS DATA TO HAVE A BALANCE POSITION TO SPEC OF
A=B
[CHECKING CONFIRMATION ]
CONFIRMATION BY CRT SCREEN
HISTORY
OFREVISION
REVISED CONTENT .
US4CHLIONHEAD(MONOSCOPE)
B
A
CONTENT
OUTPUT
ADJUSTMENT
PROCEDURE
LEFT AND RIGHT SYMMETRICAL
SYMBOL
5 – 7
ADJUSTMENT
ITEM
ADJUSTMENT
POSITION
CONTROL
PRE-ADJUST
REQUIREMENT
CONTENT
INPUT
CONDITION
MODEL NAME
CRT CUT OFF ADJUSTMENT
30 (VSD)
STEP RANGE
14T1-L
I2C CONTROL
BUS SET UP
AV MODE (WITHOUT SIGNAL) WITH BLUEBACK OFF
AC 220 V, AV INPUT
CONFIRMATION ON CRT DISPLAY.
[CHECKING CONFIRMATION ]
1) IN SERVICE MODE, SET CUT OFF TO 27, SUB-CON TO 45, SUB-BRI TO 32 AND DRI-RS, DRI-RS&
DRI-BS TO 32; CUT-RS, CUT-GS & CUT-BS TO 16 , SWITCH TV TO VIDEO MODE, BLUE BACK OFF,
WITHOUT SIGNAL.
2) GO TO ADJUSTMENT MODE ITEM VSD AND PRESS VOLUME UP AT R/C. ADJUST THE SCREEN
VR OF FBT SO THAT CUT-OFF LINE APPEAR IN LOW BRIGHT, THEN JUDGE THAT W HETHER THE
CUT-OFF LINE APPEAR IN RED OR GREEN OR BLUE COLOR. FIX THE CUT OFF DATA OF THE
COLOR APPEAR IN CUT-OFF LINE AND USE R/C TO ADJUST THE OTHER TWO AMONG CUT-RS,
CUT-GS & CUT-BS UNTIL COLOUR BECOME WHITE.
3)TURN THE SCREEN VR OF FBT SO THAT CUT-OFF LINE JUST DISAPPEAR.
HISTORY
OFREVISION
REVISED CONTENT .
OUTPUT
14T1-L
ADJUSTMENT
PROCEDURE
SYMBOL
5 – 8
14T1-L
ADJUSTMENT
ITEM
ADJUSTMENT
POSITION
CONTROL
PRE-ADJUST
REQUIREMENT
INPUT
CONDITION
MODEL NAME
WHITE BALANCE
4,5,6,7,8,9
STEP RANGE
0~63
14T1-L
I2C BUS CONTROL
BUS SET UP,CRT PURITY, SCREEN
AV; W/B PATTERN 1 (PATTERN GENERATOR SX- 1006)
AC 220 V, AV INPUT
CONFIRMATION ON CRT DISPLAY.
1)
WHITE
(HIGH BEAM)
FIRST LET THE GUN POINT AT
WHITE
POSITION (AS DRAWING ATTACH), ADJ
THE
PATTERN GENERATOR UPPER VR
UNTILYBECOME
150 cd/m
2
.
AFTER THAT, LET THE
GUN POINT AT WHITE POSITION AGAIN AND ADJUST THE BUS DATA OF DRI-RS AND
DRI-BS UNTLL THE AXIS OF COLOUR TEMPERATURE BECOME
X=0.273,Y=0.280
.
2)
DARK
(LOW BEAM)
LET THE GUN POINT AT DARK POSITION (AS DRAWING ATTACH),ADJUST THE
PATTERN GENERATOR LOWER VR UNTIL Y BECOME 5 cd/m2. ADJUST THE
TWO
SERVICE DATA
(AMONG CUT-RS, CUT-GS AND CUT-BS) WHICH HAVE CHOSEN AT CUT
OFF ADJUSTMENT SO THAT TO OBTAIN THE SIMILAR AXIS OF COLOUR TEMPERATURE
AS ABOVE.
*FOR ADJUSTMENT IN 1 & 2, MUST ALWAYS MAINTAIN THE Y AT 150cd/m2 (WHITE) AND
AT 5cd/m2 (DARK) WITH ADJUSTING THE UPPER AND LOWER VR OF PATTERN
GENERATOR.
**REPEAT STEP 1),2) TO GET A REGULATED LEVEL.
[CHECKING CONFIRMATION ]
X=0.273,Y=0.280 (11,600° K+1 MPCD)
HISTORY
OF REVISION
REVISED CONTENT .
WHITE
DARK
CONTENT
OUTPUT
ADJUSTMENT
PROCEDURE
SYMBOL
5 – 9
ADJUSTMENT
ITEM
ADJUSTMENT
POSITION
CONTROL
PRE-ADJUST
REQUIREMENT
CONTENT
INPUT
CONDITION
REVISED CONTENT .
HISTORY
OF REVISION
[CHECKING CONFIRMATION ]
I2C CONTROL
BUS SET UP, CUT OFF, WHITE BALANCE
AV; WINDOW PATTERN (PATTERN GENERATOR SX- 1006)
AC 220 V, AV INPUT
MODEL NAME
BLOC
34
STEP RANGE
0~15
14T1-L
CONFIRMATION ON CRT DISPLAY.
1)LET THE GUN POINT AT BLACK POSITION(AS ATTACH DRAWING), ADJUST
BLOC
BUS DATA
UNTIL LUMINANCE Y = 0.43cd/m
2
+ 0.1
BLACK
OUTPUT
14T1-L
ADJUSTMENT
PROCEDURE
SYMBOL
5 – 10
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