Orion TC1973D User manual

COLOR TELEVISION RECEIVER
TC1973D
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0. . . .
1 SPECIFICATIONS 1
UHF
CATV
All the specifications and features are subject to change without notice.

DISASSEMBLY INSTRUCTIONS
1. REMOVAL OF ANODE CAP
Read the following NOTED items before starling work.
After turning the power off there might still be a potential
voltage that is very dangerous. When removing the
Anode Cap, make sure to discharge the Anode Cap’s
potential voltage.
’Do not use pliers to loosen or tighten the Anode Cap
terminal, this may cause the spring to be damaged.
REMOVAL
1. Follow the steps as follows to discharge the Anode Cap.
(Refer to Fig. l-l.)
Connect one end of an Alligator Clip to the metal part of a
flat-blade screwdriver and the other end to ground.
While holding the plastic part of the insulated Screwdriver,
touch the support of the Anode with the tip of the
Screwdriver.
A cracking noise will be heard as the voltage is discharged.
GND on the CRT
GND on the CRT Fig. 1-l
2. Flip up the sides of the Rubber Cap in the direction
of the
arrow and remove one side of the support
(Refer to Fig. l-2.)
Rubber Cap
CRT
V
Support
Fig. 1-2
3. After one side is removed. pull in the opposite direction to
remove the other.
NOTE
Take care not to damage the Rubber Cap.
INSTALLATlON
1. Clean the spot where the cap was located with a small
amount of alcohol. (Refer to Fig. l-3.)
NOTE
Confirm that there is no dirt. dust, etc. at the spot where
the cap was located.
2. Arrange the wire of the Anode Cap and make sure the
wire is not twisted.
3. Turn over the Rubber Cap. (Refer to Fig. l-4.)
Fig. 1-4
4

DISASSEMBLY INSTRUCTIONS
4, Insert one end of the Anode Support into the anode button.
then the other as shown in Fig. I-5.
Fig. l-
5. Confirm that the Support is securely connected.
6. Put on the Rubber Cap without moving any parts.
2. REMOVAL OF DEFLECTION YOKE
(Refer to Fig. 2-1)
I. Loosen the screw 0.
2. Remove the Convergence . Purity Magnet in the
direction of arrow (A).
3. Loosen the screw 0.
4. Remove the 3 Wedges.
5. Remove the Dellection Yoke in the direction of
arrow (8).
INSTALLATION
tnstall new Deflection Yoke in reverse steps of REMOVAL.
NOTE
After adjusting the purity and the convergence. fix the
screw 0 and lock the wedges.
Wedge
Fig. 2-.
5

ELECTRICAL ADJUSTMENTS
1. BEFORE MAKING ELECTRICAL
ADJUSTMENTS
Read and perform these adjustments when repairing the
circuits or replacing electrical parts or PC6 assemblies.
CAUTION
Use an isolation transformer when performing any
sarvce on this chassis.
1.
CUTOFF
2.
VSIZE
3.
BRI. AUTO
4.
X-RAY
5.
CONT
8.
END
Before removing the anode cap, discharge electricity
because it contains high voltage.
When removing a PCB or related component, after
unfastening or changing a wire, be sure to put the wire
back in its original position.
Inferior sillcon 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.
1-l: Prepare the following measurement tools far
electrical adjustments.
1. Sweepmarker Generator
2. Oscilloscope
3. Digital Voltmeter
4. Color Bar Generator
L
Fig. 2-Z
1. AUTO
2. vco
3. AFT
4. AGC
5. COL
6. TINT
7. BRI
8. END
2. BASIC ADJUSTMENTS
Fig. 2-3
On-Screen Display Adjustment
the of a straightened paper clip into the hole
on remote control marked with an arrow as shown
2-1: VCO AND AFT
NOTE
Connect input and output terminals of the
sweepmarker generator to the circuit as shown
in Fig. 2-4-a, it.
Fig. 2-f.
The adjustment mode display will appear as shown
Fig.2-2 andFig.2.3.
NOTE
Use the 1 8 keys on the remote control to select the
options shown in Fig. 2-2 and Fig. 2-3.
Press the 8 key to end the adjustments.
Fig. 2-l
SWEEPMAKER
GENERATOROUTPUT 0.22
rF
- GND
SWEEPMAKER
GENERATOR INPUT 47Kohm lN60 4.5 pF
Fig. 2-4-z
1. Connect output terminal of Ihe sweepmarker generator to
TP201.
2. Connect input terminal of the sweepmarker generator to
TP204.
3. Connect a 10K ohm variable resistor to IF AGC terminal
(TP210). 12V line and ground. lhen adjust to make the
wavelorm 01 the oscilloscope readable
3
,
f
.

ELECTRICAL ADJUSTMENTS
10 Kohm
AGC TP210
4. Activate the adjustment mode display (Fig. 2-3) and
press the 2 key.
5. Adjust VOL. UP/DOWN key on the remote control until
the waveform maker (45.75MHz) becomes as shown in
Fig. 2-4-b.
6.
7.
6.
9.
45.75 MHz
x
Fig. 2-4-t
_
Disconnect output terminal 01 the sweepmarker generator
from TP201, then connect it to TP al the tuner pack.
Disconnect the 10K ohm and the 2.7K ohm variable
resistors.
Disconnect input and output terminals of the
sweepmarker generator.
Connect the AFT adjustment oscillator (45.75MHz)
to TP of the tuner pack.
1 O.Connect the digital voltmeter to TP206.
1 l.Activate the adjustment mode display (Fig. 2-3) and press
the 3 key.
12.Adjust VOL. UP/DOWN key on the remote control 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
2-2-A: BRIGHT
1. Receive the monochrome pattern.
2. Activate the adiustment mode displav (Fig. 2-3) and
press the 7 ke;.
,. ”
3. Press the VOL. UP/DOWN key on the remote control
until the boundary between 0% and 10% white starts
to become visible.
2-2-B: AGC
NOTE
Adjust after performing adjustments in section 2-1.
In case of weak electric field.
1. Tune to a noisy channel.
2. Activate the adjustment mode display and press
the 4 key.
3. Press the VOL. UP/DOWN key on the remote control
until noise is at minimum.
4. Change the channel. confirm that the other channels
are normal.
In case of strong electric field.
(Radio frequency interference can cause diagonal
streaks to appear.)
1. Activate the adjustment mcde display and press rhe 4 key.
2. Press the VOL. UP/DOWN key 0” the remote control untit
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 antenr,
terminals. then repeat step 1.
4. Confirm that noise does not appear.
5. Change the channel. confirm that the other channels are
normal.
2-2-C: TINT
1. Receive the color bar pattern.
2. Connect the oscilloscope to TP023.
3. Activate the adjustment mode display (Fig. 2-3) and press
the 6 key.
4. Press the VOL. UP/DOWN key on the remote control until
the waveform becomes as shown in Fig. 2-5.
1
I
Fig. 2i
2-2-D: COLOR
1. Receive the color bar pattern.
2. Connect the oscilloscope to TP022
3. Activate the adjustment mode (Fig. 2-3) display and press
the 5 key.
4. Adjust the VOLTS RANGE VARIABLE knob of the
oscilloscope until the range between white 0% and 1 CO%
is set to 5 scales on the screen of the oscilloscope.
5. Press the VOL. UP/DOWN key an the remote control untii
the red color level is adjusted to 4.75scalesf95%1 for :he
white level. (Refer to Fig. 2-6)
I
b+4
I
I
95%
LL
h-
J --OX
k
I-_-_-
-- 100%
7

ELECTRICAL ADJUSTMENTS
2-3: CUT OFF
1. Receive the color bar pattern.
2. Using the remote control. set brightness and contrast to
mm~mum position.
3. Connect the oscilloscope to TP024.
4. Adjust the screen volume until voltage is 15OVDC.
(Refer to Fig. 2-7)
----
..
.- --
*
.
.
.
I
DC1 50V
GND-
Fig. 2-
2-4: FOCUS
1. Receive the broadcasting signal.
2. Adjust the focus control until picture is distinct
2-5: VERTICAL SIZE
1. Receive the crosshatch pattern lrom the color bar generator.
2. Activate the adjustment mcde display (Fig. 2-2) and press
the 2 key.
3. Press the VOL. UP/DOWN key on the remote control until
the horizontal overscan is equal to the vertical averscan.
2-6: VERTICAL POSITION
1. Receive the color bar pattern.
2. Using the remote control, set brightness and contrast to
maximum position.
3. Adjust the value of R429 and R430 until horizontal line of
the color bar comes to approximate center of the CRT.
NOTE
R429 and R430 are fixed resistors. Use a variable
resistor to determine the optimal value and insert that
value resistor.
Lessen the value of R430 Picture will
move about
5mm UP.
Lessen the value 01 R429 Picture will move about
5mm DOWN.
2-7: HORIZONTAL POSITION
1. Receive the color bar pattern.
2. Adjust the value 01 R443 and C460 until the color width
01 both screen edges are equal.
3. Receive the broadcasting signal, then confirm picture is
normal.
NOTE
R443 and C466 are fixed components. Use a variable
resistor or capacitor to determine the optimal value and
insert that value component.
Lessen the value of R443 Picture will move right.
Lessen the value 01 C460 Picture Will move left.
8
I
1
7

I
ELECTRICAL ADJUSTMENTS
3. PURITY AND CONVERGENCE
ADJUSTMENT
NOTE
1. Turn the unit on and let it warm up for at least 30
minutes before performing the following adjustments.
2. Place the CRT surface lacing east or west to reduce the
terrestrial magnetism.
3. Turn ON the unit and demagnetize with a Degauss Coil.
3-I: STATIC CONVERGENCE (ROUGH ADJUSTMENT)
1. Tighten the xrew for the magnet. Refer to the adjusted
CRT for the position. (Refer to Fig. 3-l)
If the deflection yoke and magnet are in one body,
untighten the screw for the body.
2. Receive the green raster pattern from color bar
generator.
3. Slide the deflection yoke until it touches the funnel
side 01 the CRT.
4. Adjust center of screen to green. with red and blue on the
sides, using the pair of purity magnets.
5. Switch the color bar generator from the green raster
pattern to the crosshatch pattern.
6. Combine red and blue of the 3 color crosshatch pattern
on the center ol 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.
6. Adjust the crosshatch pattern to change to white
by repeating steps 6 and 7.
3-2: PURITY
NOTE
Adjust after performing adjustments in section 3-1.
1. Receive the green raster pattern from color bar
generatar.
2. 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.
3. Move the deflection yoke backward (To neck side)
slowly. and stop it at the position when the whole
screen IS green.
4. Confirm red and blue colors.
5~ Adjust the slant of the deflection yoke while watching the
screen. then tighten the fixing screw.
DEFLECTION YOKE
DEFLECTION YOKE SCREW
MAGNET SCREW
PURITY MAGNETS
6 POLE MAGNETS
4 POLE MAGNETS
Fig. 3-l
3-3: STATIC CONVERGENCE
NOTE
1. Receive the crosshatch pattern lrom 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 lix the deflection yoke.
(Refer to Fig. 3-2-b)
UPWARD/DOWNWARD SLANT
RIGHT/LEFT SLANT
Fig. 3-2-a
\
0
/
NEDGE
WEDGE
WEDGE
WEDGE POSITION
Fig. 3-2-b
9