Sharp 27R-S50 User manual

1
27R-S50
COLOR TELEVISION
Chassis No. SN-010
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.
S21O627R-S50/
»ELECTRICAL SPECIFICATIONS .........................................................................................................1
»IMPORTANT SERVICE SAFETY PRECAUTION .................................................................................2
»LOCATION OF USER'S CONTROL .....................................................................................................4
»INSTALLATION AND SERVICE INSTRUCTIONS................................................................................5
»CHASSIS LAYOUT .............................................................................................................................11
»BLOCK DIAGRAM ..............................................................................................................................12
»SCHEMATIC DIAGRAMS...................................................................................................................13
»PRINTED WIRING BOARD ASSEMBLIES ........................................................................................18
»REPLACEMENT PARTS LIST............................................................................................................23
»PACKING OF THE SET......................................................................................................................31
Page
SHARP CORPORATION
CONTENTS
SERVICE MANUAL
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
MODEL
POWER INPUT.................................................... 120 V AC 60 Hz
POWER RATING ................................................................. 105 W
PICTURE SIZE ........................................... 2,187cm2(339sq 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 ..................... 1.5W + 1.5W (at 10% distortion
and Dual CH Operate)
ELECTRICAL SPECIFICATIONS
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.
27R-S50

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27R-S50
IMPORTANT SERVICE SAFETY PRECAUTION
ËServicework should be performedonlybyqualifiedservice technicians who arethoroughly
familiar with all safety checks and the servicing guidelines which follow:
4A 125V
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 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
proceduresand instructionscoveringX-radiation.The
only potential source of X-ray in current solid state
TVreceiversis thepicture 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. Highvoltageshouldalwaysbekeptattheratedvalue
−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. Whenthehighvoltageregulator isoperating properly
thereis nopossibilityof anX-radiation problem.Every
timea colorchassisisserviced,the brightnessshould
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. Whentroubleshootingand takingtestmeasurements
ona receiverwithexcessivehighvoltage, avoidbeing
unnecessarily close to the receiver.
Do not operate the receiver longer than is necessary
to locate the cause of excessive voltage.
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
whichareseparated byinsulating material.The non-
isolated (hot) ground system is for the B+ voltage
regulatorcircuitand thehorizontal outputcircuit. The
isolatedground systemisfor thelow 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.
CAUTION: FOR CONTINUED
PROTECTION AGAINST A
RISK OF FIRE, REPLACE
ONLY WITH SAME TYPE 4A-
125V FUSE.

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27R-S50
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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
necessarilyincreased byusingreplacement 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 "å"
and shaded areas in the Replacement Parts Lists and
Schematic Diagrams.
IMPORTANT SERVICE SAFETY PRECAUTION
(Continued)
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 and 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 120 volt AC outlet,
(Do not use an isolation transformer for this test).
•Using two clip leads, connect a 1.5k ohm, 10 watt
resistorparalleled bya0.15µFcapacitorin serieswith
all exposed metal cabinet parts and a known earth
ground,such aselectrical conduitor electricalground
connected to earth ground.
•Use anAC voltmeter having with 5000 ohm per volt,
or higher, sensitivity to measure theAC voltage drop
across the resistor. 1.5k ohm
10W
0.15µF
TEST PROBE
TO EXPOSED
METAL PARTS CONNECT TO
KNOWN EARTH
GROUND
For continued protection, replacement parts must be
identical to those used in the original circuit. The use of
substitutereplacement partswhichdonothave thesame
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.
•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 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
purpose of completing these check.)
Anycurrentmeasured mustnot exceed0.5 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.

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27R-S50
LOCATION OF USER'S CONTROL
TV
CH
–
V
OL
+
P
OW
E
R
–
V
O
L
+
P
O
W
E
R
C
H
MENU
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.
MENU
Press →Accesses MAIN MENU.
Press again →Exits MAIN MENU.
DISPLAY
Press→Displays receivingchannel for
four seconds.
Press again →Removes display.
• Temporarily displays receiving
channel when in Closed Caption
mode.
Basic Remote Control Functions
Front Panel
POWER
Press →On.
Press again →Off.
SENSOR AREA FOR
REMOTE CONTROL
VOLUME UP/DOWN CHANNEL UP/DOWN
(') Selects next higher channel.
( ) Selects next lower channel.
• Press both at same time to
access MAIN MENU screen.
(+) Increases sound.
(–) Decreases sound.
VIDEO/AUDIO TERMINALS
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.
IN
'
'
'

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27R-S50
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 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 120V 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 TP653 and make sure
that the voltmeter reads 21.9 ±1.4V.
5. Apply external 27.9V DC at TP653 by using an
external DC supply, TV must be shut off.
6. To reset the protector, unplug the AC cord and make
ashort circuitbetweenTP651andTP652. Nowmake
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 AC
linevoltage,withastrongairsignal oraproperly tuned
in test signal.
3. Enter the service mode and select the service
adjustment "S03" and Bus data "01" (Y-mute on).
4. Thevoltageshouldbeapproximately, 30.5kV(atzero
beam).
Ifacorrectreadingcannot beobtained,check circuitry
formalfunctioning components. Afterthevoltage test,
make Y-mute off 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.

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27R-S50
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. Follow
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 theAC cord into a wall socket.
Now, the TV set is switched on and enters the service mode.
To 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 menu 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 1. There are 4 adjustment categories 2DEF,
3SIGNAL, 4FEATURE, 5FIX VALUE as show in Figure A.
Press CH UP/DOWN button for selection and enter by VOL UP or VOL DOWN.
Press CH UP/DOWN button to 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 2: DEF
DEF
RETURN
RETURN
FIX VALUE
NEXT
FEATURE
D01
D03
D05
RETURN
D02
D04
D06
Window 5: FIXVALUE
Window 1: ADJUSTMENT CATEGORIES
SERVICE MODE
DEF
SIGNAL
FEATURE
FIX VALUE
EEPROM
RETURN
RETURN
Window 3: SIGNAL
SIGNAL S01
S13
RETURN
S02
S12
F01 F02
F13 F14
RETURN NEXT
F15 F16
F25 F26
RETURNPREVIOUS
PREVIOUS
Window 4: FEATURE
M01 M02
M05
M03 M04
RETURN

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27R-S50
Below are the adjustments ranges and initial values for FIX VALUE category.
FIX VALUE
F01 OPTION 1 00-FF B0 B0
F02 OPTION 2 00-FF 04 05
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 16
F10 AFC GAIN 00, 01 00 00
F11 G DRIVE 00, 0F 00 0F
F12 FBT BLK SW 00, 01 01 01
F13 V COMP 00-07 07 07
F14 OSD CONT 00-03 02 01
F15 SHARPNESS 00-3F 19 *1
F16 FLT SYS 00-07 00 01
F17 KILLER OP 00-07 04 02
F18 PRE SHOOT 00-03 03 00
F19 CORING 00-03 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 00-0F 04 03
F26 H BLK L 00-0F 04 00
SERVICE
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
D04 CC-POSITION 00-FF 1A
D05 V-LINEARITY 00-1F 10 Must be "13"
D06 V-S-CORRECTION 00-1F 10 Must be "14"
SERVICE
POSITION ADJUST ITEM DATA
RANGE
INITIAL VALUE
ADJUSTMENT CONTENTS
Table - B
TUNER TYPE (Hex)
VTUVTST5UF770 13
VTUENV56D82-1 18
VTUENV56DA1G3 18
VTUVTST5UF670 13
VTUVTST5UF740 13
*1: type of tuner

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27R-S50
IC2001
IC2102 X
CRT X
IC201
Data is stored in IC2102.
Adjust items related to picture tube only.
Holding down both the Vol-up/Ch-down buttons on the TV set at service mode for more than 2 seconds will
automatically write the above initial values into IC2102.
Table - E
The adjustment is needed to compensate for characteristics
of parts including IC201.
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.
X
X
ADJUSTMENT
NECESSARY UNNECESSARY
PARTREPLACED NOTES
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 circuit.
S04 SUB BIAS 00-FF 40 Must be "30"
S05 R-BIAS 00-FF 00
S06 G-BIAS 00-FF 00
S07 B-BIAS 00-7F 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
SERVICE
POSITION ADJUST ITEM DATA
RANGE
INITIAL VALUE
ADJUSTMENT CONTENTS
Note: Refer to the SERVICEADJUSTMENT for each corresponding values.
Table - C
M01 MS LEVEL 00-0F 0A
M02 MTS-VCO 00-3F 20
M03 FILTER 00-3F 1C
M04 LOW SEPARATION 00-3F 20
M05 HIGH SEPARATION 00-3F 1B
SERVICE
POSITION ADJUST ITEM DATA
RANGE
INITIAL VALUE
ADJUSTMENT CONTENTS
Table - D
FEATURE
Note: Refer to the SERVICEADJUSTMENT for each corresponding values.

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27R-S50
Figure B: WAVEFORM FOR SCREEN ADJUSTMENT
ËSERVICE ADJUSTMENT
Note: Before making the service adjustment, make the
bus data settings.
+B Adjustment
(1) For the chassis with the +B adjustment control
1. Receive a good local channel.
2. Select VIDEO ADJUSTMENT RESET on the
menu to get the video reset.
3. Connect a DC voltmeter between the +B line (at
SWtransformer) ofR611 andthe groundterminal.
4. Adjust R738 so that the voltmeter should read
128.5+0.5V/-0.25V.
(2) For the chassis without the +B adjustment
control
1. Receive a good local channel.
2. Select VIDEO ADJUSTMENT RESET on the
menu to get the video reset.
3. Connect a DC voltmeter between the +B line (at
SWtransformer) ofR611 andthe groundterminal.
4. Make sure that the voltmeter reads 128.5±1.5V.
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
to "04". (If out of spec, readjust the data in the range
of "00" to "07" to obtain a normal contrast level.)
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 or
beat appears.
Note: You have to exit the service mode first to
select another channel.
Screen Adjustment
1. Connect to oscilloscope probe between TP854 and
ground of the CRT unit.
2. Receive a good local channel.
3. Enter the service mode Signal category and set the
service adjustment "S04" to step 30. Then select the
service adjustment "S12" and set the data value to
"00"tosetthecolor leveltothe minimumlevel.(record
the original data first). You may skip this step, if you
selected a B/W picture or monoscope pattern. Set
alsothe "S05/S06/S07"datato minimumlevel ("00").
2.35Vdc
GND
4. Select the service adjustment "S03" and set the data
valueto "01"to turnoffthe luminancesignal (Y-mute).
5. Select the service adjustment "S14" and adjust the
data value to obtain 2.35 volts as shown in Figure B.
6. Adjust the master screen control until the raster
darkens to the point where raster is barely seen.
7. Adjusttheserviceadjustment "S05"red, "S06"green,
"S07" blue to obtain a good grey scale with normal
white at low brightness level.
8. Selecttheservice a adjustment"S03" and resetdata
to"00". Selectthe serviceadjustment"S12"andreset
data to obtain normal color level.
9. Remove probe and reset the master screen control
to obtain normal brightness range.
White Balance Adjustment
1. Receive a good local channel.
2. 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 you selected a B/W picture
or monoscope.
3. Alternatelyadjustthe serviceadjustmentdata of"S08"
and "S09" until a good grey scale with normal white
is obtained.
4. Select the service adjustment "S12" and reset data
to obtain normal color level.
Sub-Picture Adjustment
1. Receive a good local channel.
2. Make sure the customer picture control is set to
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.
2. Setthecustomertint controlto thecenterof it’srange.
3. Enter the service mode and select the service
adjustment "S11".
4. 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 is set to center
position.
3. Enter the service mode and select the service
adjustment "S12".
4. Adjust "S12" data value to obtain normal color level.
Sub-Brightness Adjustment
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".
4. Adjust "S13" data value to obtain normal brightness
level.

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27R-S50
ËMTS ADJUSTMENT
MTS Level Adjustment
1. Feed the following monaural signal to pin (14) of
IC3001.
Monaural signal: 300Hz, 245mVrms
2. Connect the rms voltmeter to pin (39) of IC3001.
3. Enter the service mode and select the service
adjustment "M01".
4. Adjust the data so that the rms voltmeter reads 490
±10mVrms.
MTS VCO Adjustment
1. Keep the unit in no-signal state.
2. Connectthe frequencycounterto pin(39) ofIC3001.
3. Connect a capacitor (100µF, 50V) in between
positive(+) side of C3005 and ground.
4. Enter the service mode and select the service
adjustment "M02"
5. Adjust the data so that the frequency counter reads.
62.94 ±0.75kHz.
Filter Adjustment
1. Feed the following stereo pilot signal to pin (14) of
IC3001 .
Stereo pilot signal: 9.4kHz, 600mVrms.
2. Enter the service mode and select the service
adjustment "M03".
3. Adjust the data at the point where "OK" appears on
the screen. The "OK" represents the approximate
center of the adjustable range of the data.
Separation Adjustment
1. Connect the rms voltmeter to pin (39) of IC3001.
2. Receive the following composite stereo signal 1.
Composite stereo signal: 30% modulation, left
channel only, noise reduction on, 300Hz
3. Enter the service mode and select the service
adjustment "M04".
4. Adjust the data until the AC voltage reading of the
rms voltmeter is minimum.
5. Receive the following composite stereo signal 2.
Stereo signal: 30% modulation, left channel only,
noise reduction on, 3kHz
6. Enter the service mode and select the service
adjustment "M05".
7. Adjust the data until the AC voltage reading of the
rms voltmeter is minimum.
8. Take the above steps 1 thru 7 again for fine
adjustment.
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".
3. Adjust "D03" bus data to get the most acceptable
vertical position.
Note: The step range is 20 (32)+12 (3 steps)/
-20 (5 steps).
(Push once move 4 steps.)
Caption Position Adjustment (Horizontal)
1. Receive a good local channel.
2. Enter the service mode DEF category and select the
adjustment "D04".
3. Ablacktext boxwillappearonthescreen.(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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A
B
C
D
E
F
G
H
27R-S50
CHASSIS LAYOUT

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B
C
D
E
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G
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27R-S50
BLOCK DIAGRAM

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27R-S50
DESCRIPTION OF SCHEMATIC DIAGRAM
NOTES:
1. The unit of resistance "ohm" is omitted.
(K=k Ω =1000 Ω ,M=M Ω )
2. All resistors are 1/10 watt, unless otherwise noted.
3. All capacitors are µ F, unless otherwise noted.
(P=pF=µµF)
4. (G) indicates ±2% tolerance may be used.
5. indicates line isolated ground.
VOLTAGE MEASUREMENT CONDITIONS:
1. All DC voltages are measured with DVM connected
between points indicated and chassis ground, line
voltagesetat 120VAC andallcontrols setfor normal
picture unless otherwise indicated.
2. All voltages measured with 1000µ V B & W or Color
signal.
WAVEFORM MEASUREMENT CONDITIONS:
1. Photographs taken on a standard gated color bar
signal, the tint setting adjusted for proper color. The
wave shapes at the red, green and blue cathodes of
the picture tube depend on the tint, color level and
picture control.
2. indicates waveform check points (See chart,
waveforms are measured from point indicated to
chassis ground.)
å AND SHADED ( ) COMPONENTS
= SAFETY RELATED PARTS.
' MARK= X-RAY RELATED PARTS.
This circuit diagram is a standard one, printed circuits
may be subject to change for product improvement
without prior notice.
WAVEFORMS

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27R-S50
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D
E
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H
SCHEMATIC DIAGRAM: MAIN-1 Unit

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27R-S50
SCHEMATIC DIAGRAM: MAIN-2 Unit

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27R-S50
SCHEMATIC DIAGRAM: CRT and FRONT A/V Unit

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27R-S50
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A
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C
D
E
F
G
H
PWB-A: MAIN Unit (Wiring Side)
PRINTED WIRING BOARD ASSEMBLIES

21
27R-S50
20
121110987654321
A
B
C
D
E
F
G
H
PWB-A: MAIN Unit (Chip Parts Side)

22
654321
A
B
C
D
E
F
G
H
27R-S50
PWB-H: FRONT A/V Unit (Wiring Side)
PWB-B: CRT Unit (Wiring Side)

Ref. No. Part No. ★Description Code Ref. No. Part No. ★Description Code
23
27R-S50
Ref. No. Part No. ★Description Code
PICTURE TUBE
PRINTED WIRING BOARD ASSEMBLIES
(NOT REPLACEMENT ITEM)
PARTS LIST
PARTS REPLACEMENT
Replacement parts which have these special safety characteristics
identified in this manual; electrical components having such features
areidentified byåand shadedareas in the Replacement Parts Lists
and Schematic Diagrams. The use of a substitute replacement part
which dose no have the same safety characteristic as the factory
recommended replacement parts shown in this service manual may
create shock, fire or other hazards.
"HOW TO ORDER REPLACEMENT PARTS"
To have your order filled promptly and correctly, please furnish the
followinginformations.
1. MODEL NUMBER 2.REF.NO.
3. PARTNO. 4. DESCRIPTION
in USA: Contact your nearest SHARP Parts Distributor to order.
For location of SHARP Parts Distributor, Please call Toll-
Free;1-800-BE-SHARP
★ MARK: SPARE PARTS-DELIVERYSECTION
▲MARK: X- RAY RELATED PARTS
PWB-A: DUNTKA450WEV2
MAIN UNIT
'åV101 VB68ADT2506*S X Picture Tube (I.T.C) CK
or
VB68QDN891X*S
åL703 RCiLG0038MEZZ X Degaussing Coil AQ
QEARC2702MEZZ X Grounding Strap AF
MSPRT0002MEZZ X Spring AE
QCNW-0239MEZZ X Connecting Cord (DY) AM
PWB-A DUNTKA450WEV2 – MAIN Unit —
PWB-B DUNTK9510WEW3 – CRT Unit —
PWB-HDUNTK9310WEW7 – FRONTA/V Unit —
TUNER
NOTE: THE PARTS HERE SHOWN ARE SUPPLIED AS AN
ASSEMBLY BUT NOT INDEPENDENTLY.
åTU51 VTUVTST5UF770 J Tuner AZ
or
VTUENV56D82-1
INTEGRATED CIRCUITS
'åIC201 RH-iX3354CEN1 X I.C. AS
IC351 VHiAN7511//-1 J AN7511 AK
åIC501 VHiLA7841//-1 J LA7841 AM
åIC701 VHiTEA1507/-1 J TEA1507P/N1 AL
åIC702 RH-FX0034CEZZ J PC817 AE
or
RH-FX0002GEZZ
or
RH-FX0029CEZZ
åIC751 VHiKA7809AP-1 J KIA7809API AE
åIC771 VHiKA7805AP-1 J KIA7805API AE
or
VHiTA7805S/-1
IC2001 RH-iX3492CEZZQ X TMPA8700CPF AT
IC2040 VHiPST994C/-1 J PST994C AD
IC2102 VHiBR2416E2-1 J BR24C16F AK
or
VHiSLA24C16-1
IC3001 VHiCXA2074Q-1 J CXA2074Q AY
IC3371 VHiAN7511//-1 J AN7511 AK
TRANSISTORS
Q101 VS2SC3198-Y-1 J 2SC3198-Y AA
or
VS2SC945AQ/-1
Q201 VS2SC2735//1E J 2SC2735 AC
Q301 VS2SD601AR/-1 J 2SD601AR AC
or
VS2SC3928R/-1
Q451 VS2SB709AR/-1 J 2SB709AR AC
Q452 VS2SA1266-Y-1 J 2SA1266-Y AA
Q491 VS2SB709AR/-1 J 2SB709AR AC
Q601 VS2SC2482//-1 J 2SC2482 AD
åQ602 VS2SD2539//1E J 2SD2539 AP
or
VS2SD2634++-1
Q631 VS2SC3198-Y-1 J 2SC3198-Y AA
or
VS2SC945AQ/-1
Q651 VS2SB709AR/-1 J 2SB709AR AC
Q652 VS2SA1266-Y-1 J 2SA1266-Y AA
Q653 VS2SD601AR/-1 J 2SD601AR AC
åQ701 VSSPP07N60C-1 X FET AF
or
VSSPP04N60C-1
or
VS2SK2708//1E
or
VS2SK2645//-G
or
VSSTP6NC60+-1
or
VSSTP6NC60F-1
or
VSSTP7NB60F-1
åQ702 VS2SC3198-Y-1 J 2SC3198-Y AA
or
VS2SC945AQ/-1
Q703 VS2SB709AR/-1 J 2SB709AR AC