Sharp 20MR10 Bedienungsanleitung

20MR10

COLOR TELEVISION

Chassis No. SN-010

In the interests of user-safety (Required by safety regulationsin some countries)the set shouldbe restoredto its

original

condition

and only parts

identical

to those specified

should

be used.

ELECTRICAL SPECIFICA TIONS ......................................................................................................... 1

IMPORTANT SER VICE SAFETY PRECAUTION ................................................................................. 2

LOCATION OF USER'S CONTROL ..................................................................................................... 4

INSTALLATION AND SER VICE INSTRUCTIONS ................................................................................ 5

CHASSIS LAYOUT ............................................................................................................................. 11

BLOCK DIAGRAM .............................................................................................................................. 12

SCHEMATIC DIAGRAMS ................................................................................................................... 13

PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 20

REPLACEMENT PARTS LIST ............................................................................................................23

PACKING OF THE SET ............................................................................................................. ......... 29

Page

SHARP CORPORA TION This documenthas been publishedto be used for after

sales service only.

The

contents

are

subject

change

without

notice.

CONTENTS

SER VICE MANUAL

POWER INPUT .................................................... AC 120 V, 60 Hz

POWER RATING ................................................................... 69 W

PICTURE SIZE ........................................... 1,194cm2(185sq inch)

CONVERGENCE ............................................................. Magnetic

SWEEP DEFLECTION .................................................... Magnetic

FOCUS ............................................... Hi-Bi-Potential Electrostatic

INTERMEDIATE FREQUENCIES

Picture IF Carrier Frequency..................................... 45.75 MHz

Sound IF Carrier Frequency...................................... 41.25 MHz

Color Sub-Carrier Frequency .................................... 42.17 MHz

(Nominal)

AUDIO POWER

OUTPUT RATING ..................................................... 1 W (RMS)

ELECTRICAL SPECIFICA TIONS

SPEAKER

SIZE ...................................................................... 8 cm (Round)

VOICE COIL IMPEDANCE ............................ 32 ohm at 400 Hz

ANTENNA INPUT IMPEDANCE

VHF/UHF ..................................................... 75 ohm Unbalanced

TUNING RANGES

VHF-Channels ............................................................... 2 thru 13

UHF-Channels ............................................................ 14 thru 69

CATV Channels ........................................................... 1 thru 125

(EIA, Channel Plan U.S.A.)

Specifications are subject to change without

prior notice.

MODEL 20MR10

S11O220MR10

ERV

LCHV

EOA

20MR10

IMPORTANT SERVICE SAFETY PRECAUTION

Service workshould be performed only by qualified service technicians who are thoroughly

familiar withall safety checks and the servicing guidelines which follow:

4A 125V

SER VICING 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 withan insulated

wire (such as a test probe) between the pic-

ture 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 X-

radiation 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 alwaysbe

kept

at the

rated

value

-no higher. Operationat 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.Whenthe high voltage regulator is operating properly

there is no possibility of an X-radiation problem.

Every time acolorchassis is serviced,the brightness

should be tested while

monitoring

the high

voltage

witha meter to be certain that the high voltage

does

not

exceed

the

specified

value

and

that

regulating

correctly.

5. Do not use a picture tube other than that specified

or make

unrecommended

circuit

modifications

the

high voltage circuitry.

When

troubles hooting

and taking test

measurements

on a

receiver

with

excessive

high

voltage,

avoid being unnecessarily close to the receiver.

not

operate

the

receiver

longer

than

necessary

to locate the cause of

excessive

voltage.

WARNING

1. For continued safety, no

modification

of any circuit

should be attempted.

2. Disconnect AC powerbefore servicing.

3.Semiconductor heat sinks are

potential

shock

hazards when the chassis is operating.

4. The chassis in this

receiver

has two

ground

systems

whichare separatedby

insulating

material.

The

non-

isolated (hot) ground system is for the B+

voltage

regulator

circuit

and

the

horizontal

output

circuit.

The

isolated

ground

system

is for the low B+

voltages

and the secondary

circuit

the

high

voltage

transformer.

Toprevent electrical shock use an

isolation

transformer between the line cord and power

receptacle, when servicing this chassis.

CAUTION: FOR CONTINUED

PROTECTION AGAINST A

RISK OF FIRE, REPLACE

ONLYWITH SAME TYPE 4A-

125V FUSE.

20MR10

SAFETY NOTICE

Many electrical and mechanical parts in television

recevers have special

safety-related

characteristics.

These

characteristics

are often not

evident

from visual

inspection, nor can protection afforded by them be

necessarily

increased

byusing

replacement

components

rated for higher voltage,

wattageand etc.

Replacement parts which have these special safety

characteristics are identified in this manual; electrical

components

havingsuch features are

identified

by " "

and shaded areas in the Replacement Parts Lists and

Schematic Diagrams.

IMPORTANT SER VICE SAFETY PRECAUTION

(Continued)

1. Inspect all lead dress to make certain that leads are

not pinchedor that hardwareis not lodgedbetween

the chassis and other metal parts in the receiver.

2. Inspect all protectivedevices such as non-metallic

control knobs, insulating materials, cabinet backs,

adjustment and compartment covers or shields,

isolation resistor-capacity networks, mechanical

insulatorsand etc.

3. To

be sure that no shock hazard exists, check for

leakage currentin the following manner.

Plug the AC cord directly into a 120 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 conduitor 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.

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.

BEFORE RETURNING THE RECEIVER

(Fire Shock Hazard)

Before returning the receiver to the user, perform

the following safety checks.

Connectthe resistorconnection to all

exposed

metal

parts having a returnto the chassis (antenna, metal

cabinet, screw heads, knobs and control shafts,

escutcheon and 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 non-

polarized adapter plug must be used only for the

purposeof

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

mustbe taken before

returning

the

instrument to the customer.

1.5k ohm

10W

0.15 F

TEST PR OBE

CONNECT TO

KNOWN EARTH

GROUND

TO EXPOSED

METAL PARTS

20MR10

LOCATION OF USER'S CONTROL

–VOL +

POWER VIDEO IN AUDIO

–VOL+

POWER

Infrared Transmitter Window

INPUT

Press Switch to external video input

mode.

Press again Switch to TV mode.

CHANNEL UP/DOWN

( ) Selects next higher channel.

( ) Selects next lower channel.

• Moves the “ ” mark of the MENU

screen.

Press Accesses MAIN MENU.

Press again Exits MAIN MENU.

DISPLAY

Press Displays receiving channel for

four seconds.

Press again Removes display.

• Temporarily displays receiving

channel when in Closed Caption

mode.

CHANNEL UP/DOWN

() Selects next higher channel.

( ) Selects next lower channel.

• Press both at the same time to

access the MAIN MENU screen.

VOLUME UP/DOWN

(+) Increases sound.

(–) Decreases sound.

POWER

Press On.

Press again Off.

REMOTE KEYPAD

Accesses any channel from keypad.

FLASHBACK

Returns to previous channel.

VOLUME UP/DOWN

(+) Increases sound.

(–) Decreases sound.

• In menu mode, changes or selects

the TV adjustments.

MUTE

Press Mutes sound.

Press again Restores sound.

• CLOSED CAPTION appears when

sound is muted.

POWER

Press

On.

Press again Off.

SENSOR AREA FOR

REMOTE CONTROL

VIDEO IN AUDIO IN TERMINALS

G1339SB

Basic Remote Control Functions

Front Panel

20MR10

CIRCUIT PROTECTION

The receiver is protected by a 4.0A fuse (F701),

mounted on PWB-A, wired into one side of the AC

line input.

X-RADIATION PROTECT OR 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 120V AC using a variac

transformer

for

accurate input voltage.

Allow

for warm up and adjust all customer

controls

for normalpicture and sound.

3. Receive a good local channel.

4. Connect a

digital

voltmeter

to TP653 and make sure

that the

voltmeter

reads 21.4 ±1.5V.

5.Apply external 27.2V DC at TP653 by

using

external DC supply, TV must be shut of f.

6. To

reset

the

protector

unplug

the AC cord

and

make

short

circuit

between

TP651

and

TP652.

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.

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 120V

line voltage, with a strong air signal or a

properly

tuned in test signal.

3.Enter the service mode and select the

service

adjustment

"S03" and Bus data "01" (Y-mute on).

4.The

voltage

should

approximately

26.0kV (at zero

beam).

If a correct reading cannot be obtained, check

circuitry for

malfunctioning

components.

After the

voltage test, make

Y-mute of

f to the normal mode.

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.

20MR10

For adjustments of this model, the bus data is converted to various analog signals by the D/A

converter

circuit.

Note: There are still a few analog adjustments in this series such as focus and master screen voltage.

the steps below whenever the service adjusment is required.

To enter the service mode and exit service mode.

While

pressing

the Vol-up and Ch-up

buttons

at the

sametime,

plug

the AC cord into a wall socket.

Now, the TV set is

switched

on and enters the service mode.

exit

the service mode,

turn

the

television

off by

pressing

the

power

button.

1. Service mode.

Before

putting

unit

into

the service mode,

check

that

customer

adjustments

are in the

normal

mode.

Use the reset

function

in the

video

adjustment

to ensure

customer

control

are in

their

proper

(reset) position.

2. Service number selection.

In the service mode, you will see the

window

screen as window . There are 3 adjustment categories DEF,

SIGNAL, FIX VALUE as show in Figure A.

Press CH UP/DOWN buttonfor selectionand enter by VOL UP or VOL DOWN.

Press CH UP/DOWN

button

select

the

adjustment

item and VOL UP/DOWN

to adjust the data

number

for each categories.

(OSD disturbance can be erased by R/C display key)

(Note: EEPROM – factory used only)

Figure A: ADJUSTMENT CATEGORIES

Window : DEF

DEF

RETURN

FIX VALUE

RETURN

D01

D03

D05

RETURN

D02

D04

D06

Window : FIX VALUE

Window : ADJUSTMENT CATEGORIES

SERVICE MODE

DEF

SIGNAL

FIX VALUE

EEPR OM

RETURN

Window : SIGNAL

SIGNAL S01

S13

RETURN

S02

S12

F01 F02

F13 F14

RETURN NEXT

F15 F16

F25 F26

RETURN PREVIOUS

20MR10

Below are the adjustments ranges and initial values for FIX VALUE category.

FIX VALUE

F01 OPTION 1 00-FF B0 A0

F02 OPTION 2 00-FF 04 0C

F03 E-SAVE 00-3F 23 2A

F04 TUNER SETUP 00, 01 00 00

F05 R-TONE RD 00-7F 19 03

F06 R-TONE BD 00-7F 00 7C

F07 B-TONE RD 00-7F 00 00

F08 B-TONE BD 00-7F 12 04

F09 FM LEVEL 00-1F 0C 0C

F10 AFC GAIN 00, 01 00 00

F11 G DRIVE 00, 0F 0F 0F

F12 FBT BLK SW 00, 01 01 01

F13 V COMP 00-07 07 07

F14 OSD CONT 00-07 02 01

F15 SHARPNESS 00-3F 19 19

F16 FLT SYS 00-03 00 00

F17 KILLER OP 00-07 04 02

F18 Y PRI 00-03 00 00

F19 CORING 00-07 04 04

F20 DC REST 00-03 02 02

F21 BS START 00-03 01 01

F22 BS GAIN 00-03 01 01

F23 ABL START 00-07 00 00

F24 R/B ANGLE 00-0F 08 08

F25 H BLK R 00-07 04 03

F26 H BLK L 00-07 04 00

SER VICE

POSITION ADJUST ITEM DATA

RANGE

INITIAL VALUE

(Hex)

Table - A

Below are the ranges and initial values for each adjustment and in each categories.

DEF

D01 H-PHASE 00-1F 0C

D02 V-SIZE 00-7F 40

D03 V-POSITION 00-3F 20 Must be "20"

D04 CC-POSITION 00-FF 1A

D05 V-LINEARITY 00-1F 10 Must be "18"

D06 V-S-CORRECTION 00-1F 10 Must be "0C"

SER VICE

POSITION ADJUST ITEM DATA

RANGE

INITIAL VALUE

ADJUSTMENT CONTENTS

Table - B

SIGNAL

S01 RF AGC 00-3F 14

S02 VIDEO LEVEL 00-07 03

S03 Y-MUTE 00-03 00

"01":Y-MUTE, "02":V-STOP&Y-MUTE

"03":Activate color killer

S04 SUB BIAS 00-FF 40 Must be "30"

S05 R-BIAS 00-FF 00

S06 G-BIAS 00-FF 00

S07 B-BIAS 00-FF 00

S08 R-DRIVE 00-7F 40

S09 B-DRIVE 00-7F 40

S10 CONTRAST 00-7F 5A

S11 TINT 00-7F 40

S12 COLOR 00-7F 40

S13 BRIGHTNESS 00-7F 40

SER VICE

POSITION ADJUST ITEM DATA

RANGE

INITIAL VALUE

ADJUSTMENT CONTENTS

Note: Refer to the SERVICE ADJUSTMENT for each corresponding values.

Table - C

20MR10

IC2001

IC2102

(IC2101) X

CRTX

IC201

Data is stored in IC2102 (IC2101).

Adjust

items related to

picture

tube only.

Holding

down

both

the V

ol-up/Ch-down

buttons

on the TV set at

service

mode

for

than

seconds

will

automatically

write

the above initial values into IC2102 (IC2101).

Table - D

The adjustmentis needed to

compensate

for characteristics

of parts includingIC201.

Holding down both the Vol-up/Ch-down

buttons

on the TV

set in the service mode for more than 2 seconds will

automatically write the above initial values into IC2102

(IC2101).

ADJUSTMENT

NECESSAR YUNNECESSAR Y

PARTREPLACED NOTES

R2101 R2102 R2103 R2104

If using ––

IC2101

If using ––

IC2102

Table - E

20MR10

White Balance Adjustment

1. Receive a good local channel.

Select

the

service

adjustment

"S12" and set the

data

value to "00" to set the color level to the

minimun.

You may skip this step, if youselected a B/W

picture

or monoscope.

3.Alternately adjust the service adjustment data

"S08" and "S09" untila

good

grey scale

with

normal

whiteis obtained.

4. Select the service

adjustment

"S12" and reset data

to obtain normalcolor level.

Sub-Picture Adjustment

1. Receive a good local channel.

2.Make sure the customer picture control is set

maximum.

3.Enter the service mode and select the service

adjustment"S10".

4. Adjust the data value to achieve normal

contrast

range.

Sub-Tint Adjustment

1. Receive a good local channel.

Set

the

customer

tint

control

tothe

center of it’

range.

3.Enter the service mode and select the service

adjustment

"S11".

Adjust

"S11" data value to

obtain

normal

fresh tones.

Sub-Color Adjustment

1. Receive a good local channel.

2. Make sure the

customer

color

control

set

center

position.

3.Enter the service mode and select the service

adjustment

"S12".

Adjust

"S12" data value to

obtain

normal

color

level.

Sub-BrightnessAdjustment

1. Receive a good local channel.

2. Make sure the

customer

brightness

control

is set to

center position.

3.Enter the service mode and select the service

adjustment

"S13".

Adjust

"S13" data value to

obtain

normal

brightness

level.

Figure B: WAVEFORM FOR SCREEN ADJUSTMENT

SER VICE ADJUSTMENT

RF AGC Adjustment

1. Receive a

good

local channel.

2. Enter the service mode signal category and

select

the service adjustment "S01".

3. Set the data value to

point

where

no noise or

beat

appears.

4. Select another channel to

confirm

that no noise

beat appears.

Note: You have to exit the service mode first to

select another channel.

Video Level (TV Det Video Level)

Adjustment

1. Receive a good local channel.

2. Enter the service mode signal category and

select

the service adjustment "S02".

3. Set the data value to "02" first, then adjust the

data

in ranges

02±2

step to

obtain

normal

contrast

level.

Screen Adjustment

Connect

oscilloscope

probe

between

TP855

and

ground

of the CR Tunit.

2. Receive a good local channel.

3. Enter the service modeSignal

category

and set

the

service

adjustment

"S04" to step 30. Then select

the

service adjustment"S12" and set the data value

"00" to set the color level to the minimum

level.

(recordthe originaldata first).Y

mayskip this

step,

if you selected a B/W pictureor

monoscope

pattern.

Set also the "S05/S06/S07" data to minimum level.

4. Select the service adjustment"S03" and set the

data

valueto "01" to

turn

off the

luminance

signal(Y

-mute).

5.Select the service adjustment"S13" and adjust

the

data value toobtain2.35 voltsas shownin Figure B.

6.Adjust the master screen control until the

raster

darkens to the point where raster is barely seen.

Adjust

the

service

adjustment

"S05" red, "S06"

green

and "S07" blue to obtain a good grey scale

with

normal

white at low

brightness

level.

8.Select the servicea

adjustment

"S03" and reset

data

to"00".

Select

the service

adjustment

"S12" and

reset

data to obtain normalcolor level.

9. Remove

probe

and reset the

master

screen

control

obtain

normal

brightness

range.

2.35Vdc

GND

20MR10

Vertical-Size, V-Linearity and

V-S Correction Adjustments

1. Receive a good local channel.

2. Enter the service

mode

DEF

category

and

select

the

adjustment "D02" for Vertical Size, "D05" for V-

Linearity and "D06" for V-S

Correction

Adjustment.

3.Set in order "D05" for V-Linearity, "D06" for V-S

Correction

and set the data to get the best

linearity

4.Then adjust "D02" data until it become a

proper

vertical size.

Horizontal Position Adjustment

1. Receive a

good

local channel.

2. Enter the service

mode

DEF

category

and

select

the

adjustment

"D01".

3. Adjust "D01" data value to

center

the picture.

Vertical-Phase Adjustment

1. Receive a

good

local channel.

2. Enter the

service

mode

DEF

category

and

select

the

adjustment

"D03".

Adjust

"D03" bus data to get the most

acceptable

vertical position.

Note: The step range is 20 (032) ±10steps.

Caption Position Adjustment (Horizontal)

1. Receive a

good

local channel.

2. Enter the service

mode

DEF

category

and

select

the

adjustment

"D04".

3.A black text box will appear on the screen. (see

Figure C. below)

4.Adjust "D04" data value to balance the text

box

position

in the center (A=B).

Figure C.

A B

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