Emerson Orion TC1972D User manual

SERBIKE MAWAL
TCl9i’m
‘,:, ”
CAUTION
Before Servicing the chassis. read the “IMPORTANT SERVICE SAFETY INFORMATION” on page 2 of
this manual.
,,:
19’ REMOTE CONTROL COLOR
TELEVISION WITH ON-SCREEN
PICTURE CONTROLS
AKB
AUTOMATIC KlNE BIAS
CCD CLOSED CAPTION DECODER
SPECIFICATIONS
SPEAKER
6KHz
0+/-3db
SIZEE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1/16"
0.33 oz. Magnet
VOICE COILIMPEDANCE . . . . ... . . . . . . . . . . . . . . . . . .. . . . . . . .
8ohms at 600Hz
ANTENNA INPUTT
IMPEDANCE . . . . . . . . . . . ....75ohm
Coaxial
input
RECEIVING CHANNELS
UHF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.14-69
CATV . . . . . . . . . . . .
.
.
. .
14-22 .
23-36 .
. (AA-FFF)
. .
. .
. . Carrier
Frequency ...................................
45 .75MHz
Sound IF Carrier
Frequencyy...................
. ..................
41 .25MHz
Color Sub - Frequency
................................... 42
.17MHz
WEIGHT
........................................................................
38
lbs
DIMENSIONSS .......................
CONTENTS
IMPORTANT SERVICE SAFETY INFORMATION ................... 2
ELECTRICAL ADJUSTMENTS
1. BEFORE MAKING ELECTRICAL ADJUSTMENTS
1-1. PREPARE THE FOLLOWING MEASUREMENT
TOOLS FOR ELECTRICAL ADJUSTMENTS .... 3
2. BASiC AOJUSTMENTS
2-1. VIF ANDD
AFT . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
2-2:BRIGHT.AGC.
TINT AND COLOR
.3. 4
2.3: CUT OFF ............................ 5
2-4. FOCUS . .
5
2-5. VERTICAL
SIZE ....................
5
2-6. VERTICAL POSITIONN
............................................ j
2-7. HORIZONTAL POSITION
....................
5
3. PURITY AND CONVERGENCE ADJUSTMENT
3-1. STATIC CONVERGENCE ROUGH ADJUSTMENTj
...
5
3.2: PURITYy
...............................................................
5
3-3. STATIC CONVERGENCE
....................................... 6
3-4: DYNAMIC CONVERGENCE..................................
6
MAJOR COMPONENTS LOCATION GUIDEE
............................
7
SEMICONDUCTOR
BASE CONNECTIONSS .............................
8
BLOCK DIAGRAM,
..............................................................
9
PRlNTED CIRCUIT BOARDS
MAIN.
...................................................................... 10..
, ,
CRT/REMOCONN............................................................
. 2
SCHEMATIC DIAGRAMS
TUNERR
..........................................................................
. 2
IF/MICON...
...................................................................
. 3
CHROMA........................................................................ 14
DEFLECTIONN
..................................................................
. 5
POWER/AUDIOO
............................................................
16
MECHANICAL
EXPLODED VIEW.
........................................ . 7
MECHANlCAL REPLACEMENT PARTS LIST................. 8
ELECTRlCAL REPLACEMENT PARTS LIST
.........-............13. 19

ELECTRICAL ADJUSTMENTS
1. BEFORE MAKING ELECTRICAL
ADJUSTMENTS
Read and perform these adjustments when repairing
the circuits or replacing electrical parts or
PCB
assemblies.
CAUTION
Use
an isolation transformer when performing
any service on lhis chassis.
Before removing the anode cap. discharge
electricity because it contains high voltage
When removing a
PCB or related component.
alter unfastening or changing a wire. be
sure to
put the
wire back in its original position.
Inferior silicon grease can damage IC’s and
transistors. When replacing
IC’s and transistors.
use only specified silicon grease
(YG6260M).
Remove all old silicon before applying new
silicon.
l-l: Prepare the following measurement tools
for electrical
adjustments
1. Sweepmarker Generator
2. Oscilloscope
3. Digital Voltmeter
4. Color Bar Generator
2. BASIC ADJUSTMENTS
2-1: VIF AND AFT
NOTE
Connect input and output terminals of the
sweepmarket generator to the circuit as shown
in Fig. 2-l-a. then adjust it.
SWEEPMARKER
GENERATOR OUTPUT
0.022.uF
SWEEPMARKER
GENERATOR INPUT 47KohmIN60 ““E TP
-60 ,GND
I Fig. 2-1
1. Connect output terminal of the sweepmarker
generator to TP201. (Connect a
2.7K ohm
resistor between them.)
2. Connect input terminal of the sweepmarker
generator
to TP204.
3. Connect a
1OK ohm variable resistor to IF AGC
terminal
(TP210). 12V line and ground. then
adjust to make the waveform of the
oscilloscope readable.
a
1OK
ohm
12V
77
AGC TP210
4. Adjust L205 until the waveform marker (45.75MHz)
becomes as shown in Fig. 2-l-b.
5,
6.
7
8.
9
10
11
45.75MHz
1
Disconnect output terminal of the sweepmarker
generator from
TP201. then connect it to TP
of the tuner pack.
Adjust tuner pack coil until the
waveform
becomes as shown in Fig. 2-l-c.
41.24MHz
Disconnect the 10K ohm variable resistor
and
2.7K ohm resistor.
Disconnect input and output terminals of the
sweepmarker generator.
Connect the AFT adjustment oscillator (45.75MHzl
to
TP, of the tuner pack through a 2.7K ohm
resistor.
Connect the digital voltmeter to
TP206.
Adjust L204 to find the point where the voltage
of
TP206 changes dramatically. and adjust to
4.5VDC at that point.
2-2: BRIGHT, AGC, TINT AND COLOR
On-Screen Display Adjustment
Insert the point of a straightened paper clip into
the hole on, the remote control marked with
an
arrow as shown in Fig. 2-2.
The adjustment mode display will appear as
shown
in Fig. 2-3.
3

ELECTRICAL ADJUSTMENTS
NOTE
Use the 1 - 7 keys on the remote control to Select
the options show” in Fig. 2-3.
Press the
7 key to end the adjustments
ADJUSTMENT MODE
1. AGC/BRIGHT/TINT/COLOR AUTO
2. SUB BRIGHT AUTO
3. AGC MANUAL
4. COLOR MANUAL
5. TINT MANUAL
6, BRIGHT MANUAL
7. END
c
Fig. 2-3
2-2-A: BRIGHT
1. Receive the monochrome pattern
2. Activate the adiustment mode display and press
the 6 key.
3. Press the VOL. UP/DOWN key on the remote
control until 0% of gray scale will begins to lighten.
2-2-B. AGC
NOTE
Adjust after performing adjustments in section 2-l
In case of weak electric field.
1. Tune to a noisy channel.
2. Activate the adjustment mode display and press
the 3 key.
3. Press the VOL. UP/DOWN key a” the remote control
until noise is at minimum.
4. Change the channel. confirm other channels
are normal.
I” case of strong electric field.
(Radio frequency interlerence can cause diagonal
streaks to appear.)
1. Aclivate the adjustment mode display and press
the 3 key.
2.
Press the VOL. UP/DOWN key on the remote
control until diagonal streaks are at minimum.
3. If there is still a problem after pressing the VOL.
UP/DOWN key
on the remote control. install
an attenuator to
the antenna terminals the”
repeat step
1.
4
4. Confirm noise does
not appear,
5. Change the channel. confirm other channels
are ‘normal.
2-2-C: TINT
1. Receive the color bar patter”.
2. Using the remote Control. set the brightness
and color to center position.
3. Using the remote control, set the contrast
to
maxlmum position.
4. Connect the
oscilloscope to TPO23.
5. Activate the adjustment mode display and press
the 5 key.
6. Press the VOL. UP/DOWN key a” the remote
Control
until the waveform becomes as show” in
Fig.
2-4
I
2-2-D: COLOR
1. Receive the color bar patter”,
2. Using the remote control, set the brightness
and tint to center position.
3. Using the remote control, set the contrast
to
maximim position
4. Connect the oscilloscope to TP022.
5. Activate the adjustment mode display and press
the 4 key.
6. Adjust the VOLTS RANGE VARIABLE knob of
the oscilloscope until the range between
white
100% and 0% is set to 5 scales a” the Screen
of
Ihe oscilloscope.
7. Press the VOL. UP/DOWN key
on the remote
control until the red color level is set to
the
4.75th scale (95%) from while 0%.
(Refer to Fig. 2-5)
Fig. 2.5

ELECTRICAL ADJUSTMENTS
4. Confirm red and blue colors
5. Adjust the slant of Ihe deflection yoke while
watching the screen. then tighten the fixing screw.
MAGNET SCREW
6POLE MAGNETS
/
- 4 POLE MAGNETS
/
I
PURITY MAGNETS
Fig. 3-1
3-3: STATIC CONVERGENCE
NOTE
Adjust after performing adjustmenls in section 3-2.
1. Receive the crosshatch pattern from
color bar
generator.
2. Combine red and blue of ‘the 3
color crosshatch
pattern on the center of the screen by adjusting
the pair of 4 pole magnets.
3. Combine red/blue (magenta) and green by
adjusting the pair of 6 pole magnets.
3-4: DYNAMIC CONVERGENCE
NOTE
Adjust after performing adjustments in section 3-3.
1. Adjust the differences around the screen by moving
the deflection yoke upward/downward and
right/left. (Refer to Fig. 3-2-a)
2. Insert three wedges between the deflection yoke
and CRT funnel to fix the deflection yoke.
(Refer to Fig. 3-2-b)
Fig. 3-2-e
WEDGE WEDGE
WEDGE
(
WEDGE POSITION
Fig. 3-2-b

ELECTRICAL ADJUSTMENTS
2-3: CUT OFF
1. Receive the color bar petter”.
2. Using the remote control. set brightness and
contrast to
minimum position.
3. Connect the oscilloscope to
,TPO24.
4. Adjust the screen control until voltage is 150VOC.
(Refer to Fig. 2-6)
--
ON” jiO”
Fig. 2-f
2-4: FOCUS
1. Receive the broadcasting signal.
2. Adiust the locus control until picture is distinct
2-5: VERTICAL SIZE
1. Receive the crosshatch petter” from the color
bar generator.
2. Adjust the bright and contrast controls until
the crosshatch patter” is distinct.
3. Adjust VA401 until the center of crosshatch
is square.
4. Receive broadcasting signal, the” confirm
picture is
normal.
2-6: VERTICAL POSITION
1, Receive the color bar patter”.
2. Using the remote control. set brightness and
Contrast Lo maximum position.
3. Adjust the value of A429 and
R430 until horizontal
line of the color bar comes to approximate center
of the CRT.
NOTE
Lessen the value of R430......Picture will move about
5mm UP.
Lessen the value of R429.....Picture will move about
5mm DOWN.
R429 and R430 are fixed resistors. Use a variable
resistor to determine the optimal value and insert
that value resistor.
2-7:
HORIZONTAL POSITION
Receive the color bar patter”.
Using the remote control. set brightness and
contrast to maximum position.
Adjust the value of
R444 and C460 until the color width
of both
screen edges are equal.
Receive the broadcasting signal, the” confirm
picture is normal.
NOTE
Lessen the value of R444......Picture will move right.
Lessen the value of
C460 ,...,.Picture will move left.
R444 and C460 are fixed components. Use a variable
resistor or capacitor to determine the optimal value
and insert that value component.
3. PURITY AND CONVERGENCE
ADJUSTMENT
NOTE
1. Turn the unit on and let it warm up for at
least 30 minutes before performing the followiiig
adjustments.
2. Place the CRT surface facing east or west to
reduce the terrestrial magnetism.
3. Turn ON the unit and demagnetize with
a
degauss Coil,
3-1: STATIC CONVERGENCE (ROUGH
ADJUSTMENT
1. Tighten the screw for the magnet. Refer to the
adjusted
CRT for the position.
(Refer to Fig. 3-1)
If the deflection yoke and magnet are in one
body, untighten the screw for
the body.
2. Receive the green
raster patter” from color
bar generator.
3. Slide the deflection yoke until it touches the
funnel side of the CRT.
4. Adjust center of screen to green. with red
and blue a” the sides, using the pair
of
purity magnets.
5. Switch the color bar generator from the
green
raster patter” to, the crosshatch pattern.
6. Combine red and blue of the 3 color crosshatch
Patter” on the center of the screen by adjusting
the pair of
4 pole magnets.
7. Combine red/blue (magenta) and green by
adjusting the pair of 6 pole magnets.
8. Adjust the crosshatch petter” to change to
white by repeating steps 6 and 7.
3-2:
PURITY
NOTE
Adjust after; performing adjustments in section 3-1
Receive
the green raster petter” from color bar
generator.
Adjust the pair of purity magnets to center
the
color on the screen.
Adjust the pair of purity magnets so the color
at ends are equally wide.
Move the deflection yoke backward (to
neck
side) slowly, and Stop it at the position when
the whole screen is green.