akira CT-21DR9 User manual

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Model No: CT -21DR9A_21DR9CP_21DR9CP(SKD)_21DR9R_21DR9R(SKD)
Version 1.0
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CHASSIS: SS1
MODEL:
CT-21DR9A
CT-21DR9CP
CT-21DR9CP(SKD)
CT-21DR9R
CT-21DR9R(SKD)

Model No: CT -21DR9A_21DR9CP_21DR9CP(SKD)_21DR9R_21DR9R(SKD)
Version 1.0
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CONTENTS
Specifications ....................................................……………………………. ….. 4
X-Ray Radiation Precaution ………………………………………………………..5
Safety Precaution ……………………………………………………………………5
Product Safety Notice ……………………………………………………………….5
Alignment Instructions ……………………………………………………….………6
Schematic Diagram ………………………………………………………………….11

Model No: CT -21DR9A_21DR9CP_21DR9CP(SKD)_21DR9R_21DR9R(SKD)
Version 1.0
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SPECIFICATIONS
RECEIVING SYSTEM
Sound System : A = BG/DK/I/M, R, N = BG/DK/I, CP = BG
Colour System : A = PAL/SECAM/NTSC/NTSC P/B
R, N = PAL/SECAM/NTSC P/B
CP = PAL/NTSC P/B
Picture Tube : 54 cm (21”) diagonal
Ext. Antenna : 75 Ohm Coaxial Cable
Ext. In/Out : Audio/Video-in/out
Speakers : 5W x 2
Volts : A = AC 100 ~ 260V 50/60Hz
R,N,CP = AC 150 ~260V 50/60Hz
Power Consumption : 21” = 75W
Dimension : 21” = 580(W) x 515(D) x 520(H) mm
Net Weigh : 21” (22 kg)
REMOTE CONTROL
Transmitting System : Infra-red
Power Supply : DC 3V (1.5Vx2)
Design and specifications are subject to change without prior notice

Model No: CT -21DR9A_21DR9CP_21DR9CP(SKD)_21DR9R_21DR9R(SKD)
Version 1.0
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CAUTION
Before serving the chassis, read the “X-Ray Radiation Precaution”, “Safety Precaution” and
“Product Safety Notice” on this page.
X-RAY RADIATION PRECAUTION
1. Excessive high voltage can produce potentially hazardous X-Ray Radiation. To avoid such
hazards, the high voltage must not be above the specified limit. The normal value of the high
voltage of this receiver is 24KV at zero beam current (minimum brightness) under 220V AC
power source. The high voltage must not, under any circumstances, exceed 30KV.
2. Each time a receiver requires servicing, the high voltage should be checked following the High
Voltage Check procedure in this manual. It is recommended the reading of the high voltage
should be recorded as a part of the service record. It is important to use an accurate and reliable
high voltage meter.
3. The primary source of X-Ray Radiation in this TV receiver is the picture tube. For continued X-
Ray Radiation protection, the replacement tube must be exactly the same type tube as specified
in the part list.
4. Some parts in this receiver have special safety–related characteristics for X-Ray Radiation
protection. For continued safety, parts replacement should be undertaken only after referring to
the Product Safety Notice.
SAFETY PRECAUTION
Warning: Service should not be attempted by anyone unfamiliar with necessary precaution on this
receiver. The following are the necessary precautions observed before servicing this chassis.
1. Since the power supply circuit of this receiver is directly connected to the AC power line, an
isolation transformer should be used during any dynamic service to avoid possible shock hazard.
2. Always discharge the picture tube anode to the CRT conductive coating before handling the
picture tube. The picture tube is highly evacuated and if broken, glass fragment will be violently
expelled. Use shatter proof goggles and keep picture tube away from the unprotected body while
handling.
3. When replacing a chassis in the cabinet, always be certain that all the protective devices are put
back in place, such as: non-metallic control knobs, insulating covers, shields, isolation resistor-
capacitor network etc.
4. When replacing parts or circuit boards, disconnect the power cord.
5. When replacing a high voltage resistor (Metal oxide film resistor) on circuit board, keep the
resistor 10mm (1/2in.)away from circuit board.
6. Connection wires must be kept away from components with high voltage or high temperature.
7. If any fuse in this TV receiver is blow, replace it with the FUSE specified in the chassis part list.
8. The receiver is designed to operate with 220V(50/60Hz) AC mains.
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 X-Ray Radiation protection
afforded by them cannot necessarily be obtained by using replacement components rated for high
wattage, etc. Replaced parts which have these special safety characteristics are identified in this manual
and its supplements, electrical components having such features are shaded on the schematic diagram
and the part list.
Before replacing any of these components, read the part list in this manual carefully. The use of
substitute replacement parts, which do not have the same safety characteristics, as specified in the part
list may create shock, fire, and X-Ray Radiation or other hazards.

Model No: CT -21DR9A_21DR9CP_21DR9CP(SKD)_21DR9R_21DR9R(SKD)
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ALIGNMENT INSTRUCTION
(A) MAIN CHASSIS ALIGNMENT INSTRUCTION
1. Equipment requirement:-
1.1 Colour Television signal generator or Central TV signal generator
1.2 IF alignment –Philips Gen. 5418 or 5518
1.3 Scope 20 MHz –2 channels types
1.4 Digital multi-meter with LED display 4 digits
1.5 Factory mode remote control unit
2. Channels setting required:-
Channel -1 Monoscope pattern PAL DK Music
Channel -7 Half Colour Bar pattern PAL I Modulation
Channel -12 Crosshatch pattern PAL BG Music
Channel -13 Picture PAL DK Music
Channel -24 Half Colour Bar pattern PAL BG Modulation
Channel -56 Full Colour Bar pattern NTSC Modulation
3. Set-up Alignment:-
38 Mhz IF
Signal Gen Scope 20Mhz Digital Multi- meter
C137 +
T101
C561+
Tuner
LA76810A-IC
IF GND

Model No: CT -21DR9A_21DR9CP_21DR9CP(SKD)_21DR9R_21DR9R(SKD)
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4. B+ Voltage Alignment:-
4.1 Set and connected all the points.
4.2 Locate the RP551 alignment VR location.
4.3 Use digital multi-meter to measure the B+ voltage.
4.4 Switch on the TV chassis and connect by Philips pattern for alignment.
4.5 Align the Rp551 VR with the digital multi-meter to the required spec voltage110 Volt +/-
0.5V,(14”&21”) and 129.5Volt +/-0.5V (25”/29”/34”).
4.6 Alignment finished, apply glue onto RP551 VR. After glue re-check the B+ voltage to ensure the
B+ voltage is within spec of 110V(14”&21”) and 129.5Volt(25”/29”/34”).
5. Alignment Mode and Factory Setting:-
5.1 Switch on the TV chassis and change to AV mode position.
5.2 Press “Factory mode” key to enter “ factory alignment mode”. Use “CH +/-“ to select the
alignment item, and use “V +/-“ keys to do adjustment to you requirement.
6. IF Voltage Adjustment:-
6.1 Setting-up –set-up the Philips 5418/5518 pattern generator, AV out frequency to 38MHz, signal
level to 70dB +/-2 dB.
6.2 IF set-up 38MHz signal connected with coaxial cable with 1 capacitor of “0.01uF” and connect to
main chassis “IF” / ground points.
6.3 Tuner must not insert with the antenna.
6.4 Switch on TV chassis, adjust the IF coil “T110” and check the Ch 2 brightness line for the range
change from 0 to 5V. Reajust the voltage to meet Ch 1 position.
Note: LA76810A alignment only on VCO (T110) not others.
7. Vertical Line –Pin–Cushion Adjustment :-
7.1 Receive Channel 7 colour bar.Adjust the PR301 for vertical lines pin-cushion to 1 straight line,
adjust the PR302 for horizontal phase to spec requirement.
8. Vertical Line and Size Adjustment:-
8.1 Receive crosshatch pattern, use factory mode remote control to press “factory mode” key for
adjustment. Using CH +/-keys for V. Size and V. Line selection.
8.2 Use V +/-keys to adjust the picture line requirement and the size to spec.
9. RF AGC Adjustment:-
9.1 Receive channel 13 of picture pattern. Adjust the AGC at 60 dB for no picture
noise. 100 dB –picture should not be distorted and the VOS do not have unstable condition.
10. Checking the Electrical Function:-
10.1 Connect the power cord and connect the signal to RF input.
10.2 Check the power supply whether OK or not. Switch on the TV setand the LED is on. Switch off
the TV screen and should not have CRT spot within 3 sec.
10.3 Receive the channel 1 for monoscope pattern to check the picture focus and the round circle
should not be distorted. The Centre position, and VOS line/size are within spec. Check the
brightness, contrast and colour condition..
Check the convergence, picture must be clear, focus OK and white balance are OK.
Also check the complete screen picture quality. High voltage condition OK and the Screen
picture must be OK.
10.4 Check all the functional keys must be working well.
10.5 Receive colour pattern signal and the system colour. (PAL/SECAM/NTSC)
Check the power main on/off switch, brightness, volume, colour, contrast and tint.
The picture quality must not have colour noise,unbalance size and distorted condition.
10.6 Check the sound quality standards, Volume up/down are OK to spec, and sound output. Ensure
the sound output is not distorted and noisy. No interference for DK/BG/I/M.
10.7 Use remote Control Unit for all types of function check and ensure OK.
10.8 Check the words display condition.
10.9 Shock test and make sure the picture and sound are not distorted and shifted.

Model No: CT -21DR9A_21DR9CP_21DR9CP(SKD)_21DR9R_21DR9R(SKD)
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10.10 Use strong and weak signal to check the colour picture condition. After adjust the signal level to
35-40 dB and the colour should not gone. The picture and sound must be OK. At 60 dB the
picture should not have snownoise.
10.11 Ensure the factory mode setting are set. Set-off the factory mode function and last switch off the
TV set.
10.12 All the “NG” sets must send for repairing and recording for reference.
10.13 Check the AV input and output the picture and sound must be OK.
11. Reliability Aging Test:-
1st lot of production sets. Sampling 20 sets for aging 7 days continues test with colour signal in.
Normalproduction sets must be age for 1 day.
12. Mechanical Inspection:-
12.1 Inspect all glue are firmly placed.
12.2 Check all screws are tightened, no missing and loose.
12.3 Check all the connectors are fully located onto the chassis base.
12.4 Check all the safety components are firmly located onto the chassis and no damage.
12.5 The TV internal side should not see any excess metal materials.
12.6 Check all the cable and wire are OK in-used.
12.7 Check the FBT and switching transformers not high mounting. The big capacito are not slanting
and high mounting.
13. High Potential Testing:-
13.1 Set the mega-meter is set in position.(Insulation tester)
13.2 Set the meter to DC500V.
13.3 Use the meter probe onto the tuner body and the power cord on connector socket.
13.4 Switch on the button and test the insulation performance and the reading at 2/3 position.
13.5 Insulation spec must over 9.0 Mohm. if not reject.
Note: Everyday work check the high pot. Condition as 3100V, 10 mA, 5 sec are OK.
14. Safety Check:-
14.1 High voltage checking. Use high pot tester and set the tester to 3100V, 10mA and ensure the
AC/DC switch is in AC position. Set the tester to 10mA and timer to 5 sec.
14.2 Checking methods.
-connect the power cord into power socket.
-the high pot tester gun pointed at metal part of TV set body.
-switch on the switch to test the high electric power.
-connect with high voltage within 5 second and remove the tester gun point.
(B) CTV SET ALIGNMENT -FACTORY SERVICE MODE
1. “Enter” and “Leave” the Factory mode adjustment methods:
1.1. Enter factory password: (use normal Remote control unit)
1.1.1 Set TV as RF condition and press remote control “PROG” key and follow by “6”, “4”, “8”, “3”
1.1.2 Repeat the same step of “1.1.1.” to enter into “White Balance” adjustment condition
1.1.3 Repeat the same step of “1.1.1.” to enter into “Factory mode” adjustment condition
1.1.4 Repeat the same step of “1.1.1.” to enter into “Factory mode” setting condition
1.1.5 Repeat the same step of “1.1.1” to leave the factory mode function
1.2 Direct Enter:
Use Factory mode Remote control unit, press the “factory” key to enter into “factory mode” function.
Press one more time “factory” key to enter “White balance” adjustment condition, press one more time
to enter the adjustment condition. Press One “factory” key to setting up our requirement spec. Last
press once “factory” key to leave factory mode function.
Use “factory mode” for TV ageing, 2nd step is to align the White Balance in good condition. 3rd step
adjust the required electrical specification. (The function adjustment are 20 selection) Others function
of adjustment are 39 items, and you can use “P+/P-“ key and “V+/V-“ key for selection and
adjustment.

Model No: CT -21DR9A_21DR9CP_21DR9CP(SKD)_21DR9R_21DR9R(SKD)
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2. Setting of company logo:
2.1. Switch on the TV set and set the TV in AV mode, Press Remote control“DISP” key and the TV
screen will display “AV” and follow by presetting the Numeric key “6”, “4”, “8”, “3” to enter the
company logo setting.
2.2. Press the “P+/P-“ key for selection of function and press “V+/V-“ key for adjustment. Press “>*<-
“ key to change or select your requirement.
2.3. Logo setting 1st row that come with 4 kinds of setting:
2.4. Logo setting 2nd row that come with 2 kinds of setting:
1st turn off the display, 2nd turn on the display (display the word setting of maximum 10 words).
2.5. When the 2 rows of words are display on the TV screen, and you can check the words positioning.
Not too close to each other or the words are not clear to display on the screen. Re-set the logo
words from the logo setting factory mode.
FACTORY MODE ADJUSTMENT TABLE
Table 1
Selection
Items OSD Display Setting Description 14” 14”/21” 25”/29” 34” Reading limit
00 H.PHASE Horizontal centre 7 9 7 6 0-31
01 NT.PHASE NTSC center setting 2 0 0 0 -5 -+ 16
02 H.BLK.LEFT Horizontal left adjust 4 4 4 0/1
03 H.BLK.RIGHT Horizontal right adjust 4 4 4 0/7
04 V.SIZE Vertical size 52 82 88 83 0 -127
05 V.LINE Vertical Linearity 11 13 16 14 0 -31
06 V.POSI Vertical position 24 23 23 25 0 -63
07 V.SC Vertical SC adjust 0 0 0 0 -31
08 NT.V.SIZE NTSC Vertical size 6 0 0 0 -31 -+32
09 NT.V.LINE NTSC Vertical line 1 0 0 0 -15 -+16
10 NT.V.POST NTSC Vertical
position 10 0 0 0 -31 -+32
11 NT.V.SC NTSC Vertical SC 2 0 0 0 -15 -+16
12 RF.AGC RF AGC adjustment 23 26 26 26 0 -63
13 VOLUME
OUT Sound output 128 108 108 108 0 -127
14 SUB. CONT Contrast 23 26 26 26 0 -31
15 SUB.
COLOUR Colour 30 30 30 0 -63
16 SUB. SHARP Sharpmness 8 8 8 0 -31
17 SUB.TNT TINT Colour 16 26 26 26 0 -63
18 OSD.CONT OSD Contrast 56 60 60 60 0 -127
19 OSD. H.POSI OSD left/right 36 30 30 30 0 -127
20 OSD.V.POSI OSD up/down 17 12 12 12 0 -31

Model No: CT -21DR9A_21DR9CP_21DR9CP(SKD)_21DR9R_21DR9R(SKD)
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Table 2
Selection
Items OSD Display Setting Description 14” 14”/21” 25”/29” 34” Reading limit
00 BLK…STR.DET Black strick detect 0 0 0 0/1
01 AFT.GAIN AFT improvement 1 1 1 0/1
02 V.SETUP Vertical set-up 1 1 1 0/1
03 CD.MODE VOS standards 0 0 0 0-7
04 GRAY MOD Internal gray mode set
0:100%, 0:50% 0 0 0 0/1
05 B.GAM.DEF Blue Gam selection 3 3 3 0-3
06 RG.GAM.SEF Blue Gam adjustment 0 0 0 0/1
07 BRIGHT ABL.TH ABL setting, 0-start, 7-late 5 5 5 0-7
08 EMG.ABL.BEF Emergency on/pff, 0-ON,
1-OFF 0 0 0 0/1
09 BRT.ABL.DEF ABL ON/OFF, 0-ON, 1-
OFF 0 0 0 0/1
10 MID.STP.DEF Brightness detection 0 0 0 0/1
11 R-Y/B-Y G.BL R-Y/B-Y improvement 8 8 8 0-15
12 T-Y/B-Y ANG R-Y/B-Y adjustment 8 8 8 0-15
13 SECAM B-Y DC SECAM B-Y DC
adjustment 8 8 8 0-15
14 SECAM R-Y DC SECAM R-Y DC
adjustment 8 8 8 0-15
15 SND TRAP Colour trap filter control 4 4 4 0-7
16 VOL FIL Sound trap filter control 1 1 1 0-3
17 VIF SYS SW VCO setting 1 0 0 0 0-7
18 VIDEO LEVEL Video output adjustment 7 7 7 0-7
19 FM LEVEL Sound output adjustment 16 16 16 0-31
20 POWER OPTION Power on selection 0 1 1 1 0/3
21 LOGO AT P. ON Logo display 1 1 1 0/1
22 SEARCH CHECK Check the auto search
function 1 1 1 0/1
23 BAND OPTION Band selection 0 0 0 0-3
24 CHANNEL MAX Maximum channel
selection 254 254 254 254 0-254
25 AV OPTION AV input selection 2 2 2 2 0-3
26 POSITION L/R Channecl OSD display
position 1 1 1 1 0/1
27 BLUE BACK No signal Blue screen
selection 1 1 1 1 0/1
28 BLACK BACK Channel screen in black
selection 1 1 1 1 0/1
29 STEREO OPTION Stereo selection 1 1 1 1 0/1
30 STEREO IC Type of stereo IC used 0 0 0 0/1
31 WOOF VOLUME Woofer selection 0 0 0 0/1
32 SIF 4.5M Set 4.5 sound 1 1 1 0/1
33 SIF 5.5M Set 5.5 sound 1 1 1 0/1
34 SECAM Select Secam system 1 0 0 0 0/1
35 CHINESE OSD Chinese/English selection 0 1 1 1 0/1
36 SENSITIVITY Receive sensitivity 0 0 0 0/1
37 CUT MODE Cut picture mode 1 1 1 0/1
38 V MUTE OFF Turn off Screen black
screen display 1 0 0 0 0/1