Text preview for : emerson-orion_tc1973d_tv.pdf part of Orion tc1973d emerson-orion_tc1973d_tv



Back to : emerson-orion_tc1973d_tv. | Home

COLOR TELEVISION RECEIVER

TC1973D

Irr!
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. 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.)

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

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.)

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 Fig. 1-4

CRT

V Support

Fig. 1-2

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. l5. 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. 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

1. 2. 3. 4. 5. 8.

CUTOFF VSIZE BRI. AUTO X-RAY CONT END

f

L
1. AUTO 2 . v c o 3. AFT 4. AGC 5. COL 6. TINT 7. BRI 8. END

Fig. 2-Z ,

.

2. BASIC ADJUSTMENTS
On-Screen Display Adjustment 2-1: VCO AND AFT t h e of a s t r a i g h t e n e d p a p e r c l i pNOTE t o t h e h o l e in on r e m o t e c o n t r o l m a r k e d w i t h a n Connectw aand output terminals of the a r r o input s s h o w n F i g . 2 - f . sweepmarker generator to the circuit as shown The adjustment mode display will appear as shown in Fig. 2-4-a, it. 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. SWEEPMAKER GENERATOROUTPUT 0.22 rF

Fig. 2-3

- GND SWEEPMAKER G E N E R A T O R I N P U T 47Kohm lN60 4.5 pF

Fig. 2-4-z3 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

Fig. 2-l

ELECTRICAL ADJUSTMENTS
10 Kohm 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 45.75 MHz 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.

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.

x Fig. 2-4-t_ 6. Disconnect output terminal 01 the sweepmarker generator from TP201, then connect it to TP al the tuner pack. 7. Disconnect the 10K ohm and the 2.7K ohm variable resistors. 6. Disconnect input and output terminals of the sweepmarker generator. 9. 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.

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

LL
I
I

h- --OX J
k -100% 7

95%

I-_-_-

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- 7

1

I

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 R 4 3 0 Picture will move about 5mm UP. Lessen the value 01 R 4 2 9 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

ELECTRICAL ADJUSTMENTS
I
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 0 \ NEDGE / WEDGE 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

WEDGE WEDGE POSITION Fig. 3-2-b

PURITY MAGNETS 6 POLE MAGNETS 4 POLE MAGNETS Fig. 3-l

9