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.
Specifications are subject to change without
prior notice.
1
26PL83M
IMPORTANT SERVICE SAFETY PRECAUTION
Ë
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. 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.
CAUTION: FOR CONTINUED
PROTECTION AGAINST A
RISK OF FIRE, REPLACE
4A 125V
ONLY WITH SAME TYPE 4A125V FUSE.
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 VOLTA GE 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.
2
2
2
2
IMPORTANT SERVICE SAFETY PRECAUTION
1.5k ohm
10W
0.15µF
TEST PROBE
TO EXPOSED
METAL PARTS
CONNECT TO
KNOWN EARTH
GROUND
(Continued)
26PL83M
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 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 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.
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 "å"
and shaded areas in the Replacement Parts Lists and
Schematic Diagrams.
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.
3
26PL83M
LOCATION OF USER'S CONTROL
Front Panel
POWER
Press → On.
Press again → Off.
SENSOR AREA FOR
REMOTE CONTROL
VOLUME UP/DOWN
(+) Increases sound.
(–) Decreases sound.
Basic Remote Control Functions
POWER
Press → On.
Press again → Off.
REMOTE KEYPAD
Accesses any channel from keypad.
FLASHBACK
Returns to previous channel.
PERSONAL PREFERENCE
With the Personal Preference buttons,
you can program your favorite
programs by using the 4 categories A,
B, C and D. The channels can be
accessed quickly by using these
buttons.
VOLUME UP/DOWN
(+) Increases sound.
(–) Decreases sound.
• In menu mode, changes or selects
the TV adjustments.
MENU
Press → Accesses MAIN MENU.
Press again → Exits MAIN MENU.
CATV/DVD-TV/VCR MODE SELECT
SWITCH
In TV/VCR position, sends power and
channel select commands (Channel
up/down and Random Access buttons)
to the TV and VCR control.
In CATV/DVD position, sends power
and channel select commands to a
cable TV converter and DVD control.
DVD/VCR CONTROL
VOL +CH MENU
–
POWER POWER
POWERPOWER
POWER
TV
DVD
VCR
123
456
789
FLASHBACK
PERSONAL PREFERENCE
ABCD
VOL
—
MENUMUTE
REW PLAYFF
PA USE
STOP REC
TV • CATV • VCR • D VD
VIDEO IN 2 L-AUDIO-R
MTS STEREO
– VOL +CH
√
√
CHANNEL UP/DOWN
(
') Selects next higher channel.
(
) Selects next lower channel.
"
DISPLAY
INPUT
ENTER
0
100
CH
VOL
+
CH
CATVTV
DVDVCR
CH/SKIP
VIDEO/AUDIO IN2 TERMINALS
MENU
MENU
Press → Accesses MAIN
MENU.
Press again → Exits MAIN
MENU.
Infrared Transmitter Window
DISPLAY
Press → Displa ys receiving channel for
four seconds.
Press again → Removes display.
• Temporarily displays receiving
channel when in Closed Caption
mode.
INPUT
Press → Switch to external video
INPUT 1 mode.
Press 2 times → Switch to external video
INPUT 2 mode.
Press 3 times → Switch to external
COMPONENT mode.
Press 4 times → Switch back to the
original TV mode.
ENTER
Used in some instances where a Cable
Converter Box requires an “enter”
command after selecting channels,
when using the REMOTE KEYPAD
button.
CHANNEL UP/DOWN
(
') Selects next higher channel.
(
) Selects next lower channel.
"
•
Moves the “ » ” mar k of the MENU
screens.
MUTE
Press → Mutes sound.
Press again → Restores sound.
• CLOSED CAPTION appears when
sound is muted.
4
26PL83M
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.
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 TP651 and make sure
that the voltmeter reads 13.2 ±0.7V.
5. Apply external 16.3V DC at TP651 by using an
external DC supply, TV must be shut off.
6. To reset the protector, unplug the AC cord and plug
the AC cord power on. 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 AC
line voltage, with a strong air signal or a properly tuned
in test signal.
3. Enter the service mode and select the service
adjustment "V18" and Bus data "01" (Y -mute on, CRT
Cut Off).
4. The voltage should be approximately 29.0kV (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 mode.
5
26PL83M
For adjustments of this model, the bus data is conver ted 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 adjustment is required. See "Table-B" to determine, if service adjustments are required.
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 controls are in their proper (reset)
position.
2. Service number selection
Once in the service mode, press the Ch-up or Chdown button on the remote controller or at the set.
The service adjustment number will vary in
increments of one, from "V01" to "P08". Select the
item you wish to adjust.
3. Data number selection
Press the Vol-up or V ol-down button to adjust the data
number.
DA T A NUMBER
SERVICE ADJUSTMENT NUMBER
To enter the ser vice mode and exit service mode.
To enter the service mode manually just press and hold
the Vol-down and Ch-up buttons at the same time, plug
the AC 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.
CHANNEL
V01
Figure A.
55(085)
02
6
26PL83M
SERVICE
NUMBER
V01PICTURE030-15(00h-0Fh)
V02TINT3E0-127(00h-7Fh)
V03COLOR2D0-127(00h-7Fh)
V04SUB-COLOR100-31(00h-1Fh)Must be set to "10"
V05BRIGHT4D0-127(00h-7Fh)
V06R CUT-OFF4064-255(40h-FFh)
V07G CUT-OFF4064-255(40h-FFh)
V08B CUT-OFF4064-255(40h-FFh)
V09G DRIVE400-127(00h-7Fh)
V10B DRIVE400-127(00h-7Fh)
V11SHARP140-63(00h-3Fh)Must be set to "1E"
V12N PHASE010-3(00h-03h)Must be set to "01"
V13DC RESTORATION000-3(00h-03h)Must be set to "00"
V14BLACK STRETCH030-3(00h-03h)Must be set to "03"
V15ABL START POINT030-3(00h-03h)Must be set to "03"
V16ABL GAIN020-3(00h-03h)Must be set to "02"
V17γ POINT000-3(00h-03h)Must be set to "00"
V18Y-MUTE/V-STOP000-2"00"= Normal, "01"= No-Y, "02"= No-Y & No-Vertical
V19ENERGY SAVE280-63(00h-3Fh)Must be set to "28"
V20RTONE-GF60-255(00h-FFh)Must be set to "F6"
V21RTONE-BF60-255(00h-FFh)Must be set to "F6"
V22BTONE-G000-255(00h-FFh)Must be set to "00"
V23BTONE-B0A0-255(00h-FFh)Must be set to "0A"
V24LOW-GF70-255(00h-FFh)Must be set to "F7"
V25LOW-BE80-255(00h-FFh)Must be set to "E8"
V26ML-G000-255(00h-FFh)Must be set to "00"
V27ML-BF90-255(00h-FFh)Must be set to "F9"
V28HIGH-G030-255(00h-FFh)Must be set to "03"
V29HIGH-B060-255(00h-FFh)Must be set to "06"
V30WPS010-1Must be set to "01"
V31RGB CONTRAST200-63(00h-3Fh)Must be set to "2A"
V32Y-DL020-7(00h-07h)Must be set to "02"
V33Y-DL-INPUT010-7(00h-07h)Must be set to "01"
V34VSM GAIN070-7(00h-07h)Must be set to "07"
V35N COMB010-1Must be set to "01"
V36BPF/TOF-INPUT000-1Must be set to "00"
V37CORING000-1Must be set to "00"
V38VSM PHASE000-1Must be set to "00"
V39COLOR γ000-1Must be set to "00"
V40SHARP-INPUT140-63(00h-3Fh)Must be set to "1E"
V41TINT-INPUT3E0-127(00h-7Fh)
V42PICTURE-COMPONENT030-15(00h-0Fh)
V43TINT-COMPONENT100-31(00h-1Fh)Must be set to "10"
V44COLOR-COMPONENT300-127(00h-7Fh)Must be set to "35"
V45BRIGHT-COMPONENT4A0-127(00h-7Fh)
V46R CUT OFF-COMPONENT4064-255(40h-FFh)
V47G CUT OFF-COMPONENT4064-255(40h-FFh)
V48B CUT OFF-COMPONENT4064-255(40h-FFh)
V49G DRIVE-COMPONENT400-127(00h-7Fh)
V50B DRIVR-COMPONENT400-127(00h-7Fh)
V51SHARP COMPONENT140-63(00h-3Fh)Must be set to "1E"
V52N PHASE-COMPONENT010-3(00h-03h)Must be set to "01"
V53C-TRAP000-1Must be set to "00"
ADJUSTMENT ITEM
INITIAL VALUE
DATA
ADJUSTMENT CONTENTS
RANGE
R01RF-AGC240-63(00h-3Fh)
R02PIF VCO coil– – —
R03RF-AGC REF5C0-255(00h-FFh)Must be set to "5C"
D01V POSITION000-7(00h-07h)
D02H POSITION100-31(00h-1Fh)
D03V SIZE120-63(00h-3Fh)Must be set to "0B"
D04H SIZE1F0-63(00h-3Fh)
D05V-LINEARITY070-15(00h-0Fh)
D06V-S CORRECTION080-15(00h-0Fh)Must be set to "08"
D07EW PARABOLA210-63(00h-3Fh)Must be set to "21"
D08EW TRAPEZIUM0E0-31(00h-1Fh)Must be set to "0E"
D09EW CORNER0C0-15(00h-0Fh)Must be set to "00"
Table - A
7
26PL83M
SERVICE
NUMBER
D10AFC GAIN020-3(00h-03h)Must be set to "02"
D11V EHT070-7(00h-07h)Must be set to "07"
D12H EHT030-7(00h-07h)Must be set to "03"
EX1FAO VOLUME240-50(00h-32h)Must be set to "24"
EX2CC-POSITION210-127(00h-7Fh)
EX3INT7A0-255(00h-FFh)Must be set to "7A"
EX4A-ATT5A0-127
OP1OPTION1BA0-255(00h-FFh)Must be set to "A4"
OP2OPTION2010-7(00h-07h)Must be set to "03"
M01INPUT LEVEL090-15(00h-0Fh)Must be set to "09"
M02MTS VCO240-63(00h-3Fh)
M03FILTER1F0-63(00h-3Fh)
M04WIDEBAND180-63(00h-3Fh)
M05SPECTRAL100-63(00h-3Fh)
P01CONTRAST-PIP320-127(00h-7Fh)
P02TINT-PIP290-63(00h-3Fh)Must be set to "29"
P03COLOR-SAT -PIP320-127(00h-7Fh)
P04Y-OFFSET-PIP090-31(00h-1Fh)Must be set to "09"
P05HXA-PIP0A0-255(00h-FFh)Must be set to "0A"
P06HADJ-PIP000-15(00h-0Fh)Must be set to "00"
P07FREE RUN-PIP0B0-15(00h-0Fh)Must be set to "0B"
P08TINT-PIP-INPUT240-63(00h-3Fh)Must be set to "24"
ADJUSTMENT ITEM
INITIAL VALUE
DATA
ADJUSTMENT CONTENTS
RANGE
Table - A
Holding down both the VOL-up and CH-up buttons on the TV set at service mode for more than 2 seconds will
automatically write the above initial values into IC2102.
PART REPLACED
IC2001
IC201
IC2102
CRT
IC3001
NECESSARYUNNECESSARY
ADJUSTMENT
X
X
X
X
NOTES
X
Data is stored in IC2102.
The adjustment is needed to compensate for characteristics of parts
including IC201 and MTS level (M01).
Holding down both the VOL-up and CH-up buttons on the TV set in
the service mode for more than 2 seconds will automatically write the
above initial values into IC2102. Then perform a complete adjustment.
Adjust items related to picture tube only.
Adjust items related to MTS only (M01~M05).
Table - B
8
SERVICE ADJUSTMENT
26PL83M
VCO Adjustment
1. Connect a digital voltmeter between pin (55) of IC201
and ground.
2. Receive a good local channel.
3. Enter the service mode and select the service
adjustment "R02".
4. Adjust T201 so that digital voltmeter reads
2.5±1.0VDC.
5. Adjustment is completed, remove the voltmeter,
return to "normal" mode.
RF AGC Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "R01".
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 1 : You will have to come out of the service
mode to select another channel.
Note 2 : Setting the data to "00" will produce a black
raster.
Screen Adjustment
White Balance Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "V03" and set to "00" (minimum
color)(Record original data code under adjustment
"V03" before changing). "V03" does not have to be
adjusted, if you selected a B/W picture or monoscope
pattern.
3. Alternately adjust the service adjustment data of "V09"
and "V10" until a good grey scale with normal whites
is obtained. (RF Input)
4. For component input, the data value of "V49" and
"V50" is adjusted to follow the data value of "V09"
and "V10" respectively.
5. Select the service adjustment "V03" and reset data
to obtain normal color level.
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 "V01".
4. Adjust the data value to achieve normal contrast
range.
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "V03" and set the data value to "00" to
set the color level to minimum. (Record original data
code under adjustment "V03" before changing) You
may skip this step, if you selected a B/W picture or
monoscope pattern.
3. Select the service adjustment "V18" and adjust the
data value to "01", this turn off the luminance signal
(Y-mute).
4. Adjust the master screen control until the raster
darkens to the point where raster is barely seen.
5. Adjust the service adjustments "V06" red, "V07" green
and "V08" blue to obtain a good grey scale with
normal whites at low brightness level.
6. Select the service adjustment "V18" and reset data
to "00". Select the service adjustment "V03" and reset
data to obtain normal color level.
7. For component input, the data value of "V46" red,
"V47" green and "V48" blue is adjusted to follow the
data value of "V06", "V07" and "V08" respectively.
8. Reset the master screen control to obtain normal
brightness range.
Tint Adjustment
1. Receive a good local channel.
2. Set customer tint control to center of it's range.
3. Enter the service mode and select the service
adjustment "V02".
4. Adjust "V02" data value to obtain normal flesh tones.
5. Input same data to "V41".
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 service adjustment
"V04".
4. Adjust "V04" data value to obtain normal color level.
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 "V05".
4. Adjust "V05" data value to obtain normal brightness
level.
9
26PL83M
Vertical-Size and Linearity Adjustments
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "D03" for V-size.
3. Adjust the "D03" bus data to get the proper V-size.
4. For V-linearity adjustment, select data bus "D05" and
adjust to get the proper vertical linearity.
Note: Aging for 10 min before adjustment. After the
adjustment of V-center and V-size, readjustment for this V-line.
Vertical Phase Adjustment
1. Enter the service mode and select the service
adjustment "D01".
2. Adjust "D01" data value so that picture is centered.
Horizontal Position Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "D02".
3. Adjust "D02" data value so that picture is centered.
Caption Position Adjustment (Horizontal)
Other Adjustments
1. Enter the service mode.
2. Adjust the following data values as listed below.
SERVICEADJUSTDATA
POSITIONITEM(Hex)
OP1OPTION1A4
OP2OPTION203
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "EX2".
3. A black text box appears on the screen. (see
B.
below)
4. Adjust "EX2" data value so that text box is positioned
in the center of the screen.
Figure
Figure B.
10
Ë
MTS ADJUSTMENT
MTS Level Adjustment
1. Receive the following composite signal.
Monaural signal: 400Hz, 100% modulation
2. Connect the rms voltmeter to pin (39) of IC3001.
3. Enter the service mode and select the service
adjustment "M01" and set to "09".
4. Enter the service mode and select the service
adjustment "EX4".
5. Adjust the data so that the rms voltmeter reads 490
±10 mVrms.
MTS VCO Adjustment
1. Keep the unit in no-signal state.
2. Connect the frequency counter to pin (39) of IC3001.
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.
26PL83M
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 until "OK" appears in position on the
screen. Make sure the "OK" is displayed almost at
the center of the data range.
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.
11
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