akira CT-21FD9M User manual
CONTENTS
1. SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. GENERAL INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4. INSTRUCTION MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6. BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7. THE METHOD OF ADJUSTMENT FOR CHASSIS . . . . . . . 25
8. IC DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
9. EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
10. SCHEMETIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
11. PRINTED CIRCUIT BOARD . . . . . . . . . . . . . . . . . . . . . . . . 36
12. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . 37
SERVICE MANUAL
H-704V CHASSIS
- 1 -
• SAFETY PRECAUTION
WARNING: Service should not be attempted by anyone unfamiliar with the necessary precaution an this
receiver. The following are the necessary precaution to be observed before servicing.
1. Always discharge the picture tube anode to the CRT conductive coating before handing the picture tube.
The picture tube is highly evacuated and if broken, glass fragments will be violently expelled. Use
shatterproof goggles and keep picture tube away from the body while handing.
2. When replacing chassis in the cabinet, always be certain that all the protective devices are put back in
place, such as; nonmetallic control knobs, insulating covers, shields, isolation resistor-capacitor network,
etc.
3. Before returning the set to the customer, always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, screw heads, metal overlays, control shafts etc.
to be sure the set is safe to operate without danger of electrical shock. Plug the AC line cord directly onto
a 110/220V AC outlet. Use an AC voltmeter having 500 ohms per volt or more sensitivity in the following
manner. Connect a 1500 ohm 10 watt resistor, paralleled by a 0.15 µF, AC type capacitor, between a
known good earth ground (water pipe, conduit etc.) and the exposed metallic parts, one at a time.
Measure the AC voltage across the combination of 1500 ohm resistor and 0.15 µF capacitor. Reverse the
AC plug at the AC outlet and repeat AC voltage measurements for each exposed metallic part. Voltage
measured must not exceed 0.3 volts RMS. This corresponds to 0.2 milliamp. AC Any value exceeding this
limit constitutes a potential shock hazard and must be corrected immediately.
AC VOLT METER
0.15 µF
1500 ohm
10 watt
Good earth ground
such as a water
pipe, conduit, etc. FIG 1
Place thes probe
on each exposed
metallic part
- 2 -
1. SAFETY INSTRUCTIONS
1-1 PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety-related characteristics.
These characteristics are often passed unnoticed by a visual inspection and the protection afforded by
them cannot necessarily be obtained by using replacement components rated for higher voltage,
wattage, etc. Replacement parts which have these special safety characteristics are Identified in this
manual and its,
Supplements : Electrical components having such features are identified by shading on the schematic
diagram and the part list. Before replacing any of these components, read the parts list
in this manual carefully. The use of sub,situte replacement parts which do not have
same safety characteristics as specified in the parts list may create shock, fire or other
hazards.
1-2 SERVICE NOTES
1. When replacing parts or circuit boards, clamp the lead wires to terminals before soldering.
2. When replacing a high wattage resistor (metal oxide film resistor in the circuit .board) keep the
resistor min 1 /2inch away from the circuit board.
3. Keep wires away from high voltage or high temperature components.
- 3 -
2. GENERAL INSTRUCTIONS
2-1 CONVERGENCE MAGNET ASSEMBLY POSITIONING
Convergence magnet assembly and rubber wedges need mechanical positioning following figure 2.
2-2 COLOR-PURITY-ADJUSTMENT
NOTE : Before attempting any purity adjustments, the receiver should be operated for at least 15
minutes.
1. Demagnetize the picture tube and cabinet by using a degaussing coil.
2. Turn the CONTRAST and BRIGHTNESS controls to maximum.
3. Adjust RED and BLUE BIA, 5 controls to provide only a green rather.
4. Loosen the clamp screw holding the yoke, and slide the yoke backward to provide vertical green
belt(zone) in the picture screen.
5. Remote the Rubber Wedges.
6. Rotate and spread the tabs of the purity magnet(See figure 3) around the neck of the picture tube
until the green belt is in the center of the screen. At the same time, center the raster vertically.
7. Move the yoke slowly forward until a uniform green screen is obtained.
Tighten the clamp screw of the yoke temporarily.
8. Check the purity of the red and blue raster by adjusting the BIAS controls.
9. Obtain a white raster, referring to “CRT GRAY SCALE ADJUSTMENT”.
10. Proceed with convergence adjutment.
FIG. 2 Rubber Wedges Location
- 4 -
2-3 CONVERGENCE ADJUSTMENTS
NOTE : Before attempting any convergence adjutment, the receiver should be operated for at least 15
minutes.
2-3-1 CENTER CONVERGENCE ADJUSTMENT
1 .Receive a crosshatch pattern with a color bar signal generator.
2. Adjust the BRIGHTNESS and CONTRAST controls for a well defined pattern.
3. Adjust two tabs of the 4-pole Magnets to change the angle between them (See
figure 3)and superimpose red and blue vertical lines in the center area of the picture screen.
4. Turn both tabs at the same time keep in their angles constant to superimpose red and blue
horizontal lines at the center of the screen. (See figure 4).
5. Adjust two tabs of 6-Pole Magnets to superimpose red/blue line with green one.
Adjusting the angle affects the vertical lines and rotating both magnets affects the horizontal lines.
6. Repeat adjustment 3, 4, 5 Keeping in mind red. green and blue movement, because 4-Pole
Magnets and 6-Pole Magnets interact and make dot movement complex.
FIG. 3
FIG. 4
- 5 -
2-3-2 CONVERGENCE ADJUSTMENT
NOTE : This adjustment requires Rubber Wedge Kit.
1. Loosen the clamping screw of deflection yoke to allow the yoke to tiIt.
2. Place a wedge as shown in figure(2) temporartily.
(Do not remove cover paper on adhesive part of the wedge.)
3. Tilt the front of the deflection yoke up or down to obtain better convergence in circumference (See
figure 4) Push the mounted wedge into the space between picture tube arid the yoke to hold the
yoke temporarily.
4. Place other wedge into bottom space arid remove the cover paper to stick.
5. Tilt the front of the yoke right or left to obtain better convergence in circumference
(See figure 4.)
6. Hold the yoke position arid put another wedge in upper space, remove cover paper and stick the
wedges, recheck overall convergence .
7. Detach the temporarily mounted wedge and put it in another upper space.
Stick 2 on picture tube to fix the yoke.
8. After placing three wedges, recheck overall convergence.
Tighten the screw firmly to hold the yoke tightly in place.
9. Stick 3 adhesive tapes on wedges as shown in figure 2.
- 6 -
REMARKSPECIFICATIONITEM
3. SPECIFICATIONS
H-704V
VOLTAGE SYNTHESIZE (WITH REMOCON)
100 CHS
B/G, D/K,I, M(option)
PAL,SECAM, NTSC (option)
75 OHM ONLY ( UHF VHF 1 INPUT)
DIPOLE 700 3STEP
ELECTRONIC & VARACTOR
DT5-BF14D(DAEWOO), LG TUNER
L:S6~E2
H:S36~37
E69~S37
38.9MHz
DEPAND ON CCIR STANDARD
4.5(OPTION), 5.5, 6.0, 6.5MHz
F.M
AC 90-250V, 50/60Hz
CONTINENTAL PLUG
14" : 68[W] 20" : 75[W] 21" : 80[W]
NONE
AV 1,2 INPUT (RCA JACK)
MONITOR OUT (RCA JACK)
CATHODE RAY TUBE
5+5 WATTS MAX
8 OHM 5W(2EA)
1
GENERAL
2
ELECT-
RICAL
1) MODEL NO.
2) CHASSIS NO.
3)
TUNING
SYSTEM
1) CCIR STANDARD
2) COLOR STANDARD
3) ANT.
INPUT
4)
TUNER
5)
RECEPT10N
CHANNEL
6)
IF &
SUBCAR
RIER
7) SOUND TRANSMISSION
(DECODING) SYSTEM
8) MAINS
9) COUNTRY
10) SAFETY STANDARD
11) AUX
TERMIN-
AL
12)
DISPLAY
13)
AUDIO
1) METHOD
2) CHANNEL OF
PROGRAM
3) REMOTE
CONTROLLER
1) TERMINAL
2) ANTENNA
1) TYPE
2) PART NO
1) VHF
2) UHF
1) PIF
2) SIF
3) SOUND
SUBCARRIER
1) VOLTAGE &
FREQUENCY
2) CORD
3) POWER
CONSUMPTION
1) INPUT
2) OUTPUT
1) TYPE
2) SIZE
3) PART NO.
1) OUTPUT
POWER
2) SPEAKER
- 7 -
REMARKSPECIFICATIONITEM
- MENU
- CH UP
- CH DOWN
- VOL UP
- VOL DOWN
- TV/VIDEO SELECT
POWER 0-9
TV/AV/SAT(SAT:OPTION)
MUTE
CH UP SLEEP
CH DOWN FUZZY
VOL UP SOUND(STREO OPTION)
VOL DOWN DISPLAY
MENU QUICK VIEW
TIMER PICTURE
OK S-MENU(SAT OPTION)
STORE(SAT OPTION) SCREEN(SAT OPTION)
SCAN(SAT OPTION) SCREEN(SAT OPTION)
R,G,B,Y(TTX OPTION)
- NO SIGNAL AUTO POWER OFF ( AFTER 15
MINUTES )
- WHITE BALANCE CONTROL SERVICE KEY (FOR
FACTORY)
- LANGUAGE (MULTI)
- FUZZY PICTURE CONTROL
(NOMAL1, NOMAL2, FOVORITE)
- ON SCREEN DISPLAY
- 24 HOURS PROGRAMMABLE ON/OFF FUNCTION
- AUTO AGC CONTROL
- DC POWER(OPTION)
- RF/AV STEREO (OPTION)/NTSC
(EXCEPT RF STEREO)
- TTX(OPTION)
- SCART JACK
3.
USER
CONTR-
OL &
ACCES-
SORIES
4. SPECIAL NOTES
5. OPTION
1.
CONTROL 1) SET
2) REMOTE
CONTROLLER
- 8 -
4. INSTRUCTION MANUAL
To get the best satisfaction with your new COLOR TV SET, please read carefully and follow the instruction in
this guide.
We recommend that you read it before turning on your TV for the first time.
HOW TO GET THE BEST SATISFACTION
FROM YOUR NEW COLOR TV SET
INSTALLATION
ANTENNA
Unless your TV is connected to a cable TV system or to a centralized antenna system, a good outdoor color TV
antenna is recommended for the best performance. However, exceptionally, if you are in good signal area that is
free from interference of an electric wave, then an indoor antenna may be sufficient.
LOCATION(Ventilation)
Select an area where sunlight or bright indoor illumination will not fall directly on the TV screen. When you
place your COLOR TV, don’t forget to leave an interval of at least 10cm from the wall to prevent overheating.
POWER
Insert the power cord plug into 110/220, (100-240 Volts Automatic Voltage Regulator) 50/60 Hertz outlet.
Or, Insert the DC CAR cord plug into 9-13V outlet (option)
Please, Do not use DC power cord plug and AC power cord plug, together.
4-1. VHF ANTENNA or CABLE HOOK UP
At first, insert the lead of rod antenna into antenna adapter.
And connect antenna adapter to tuner jack. This antenna will provide an excellent picture in most areas. For the best
picture quality, adjust the length and position of antenna.
NOTE 1
If you don’t get good picture quality with an indoor antenna, an outdoor antenna is recommended. In this case
you should disconnect the indoor antenna before connecting an outdoor antenna to the TV.
- 9 -
MAKE REFERENCE TO THE BELOW THE PICTURE
ANTENNA JACK
75-300 OHM
COUPLING
TRANSFORMER
FROM 75OHM
ANTENNA
WITH CABLE OR
CABLE TV SYSTEM
ROD ANTENNA
TV SET OPERATION
Generally, REMOTE CONTROLLER has all the functions of the TV for normal use.
4-2. TO TURN ON/OFF THE TV SET
1-1 To turn on the TV, press MAIN POWER BUTTON on the front of TV, then
press any BUTTON on the PANEL or REMOTE CONTROLLER.
1-2 To turn off the TV, press POWER BUTTON on the PANEL or REMOTE
CONTROLLER.
4-3. TO SELECT CHANNEL
You can select the channels with CHANNEL NUMBER buttons or CHANNEL
UP/DOWN button.
4-3-1. TO SELECT CHANNEL DIRECTLY
Press the channel number you want with the number buttons. You can select 0~99 channels.
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