akira CT-21TF9 Service Manual Download Page 8

Page: 8 / 14

Model No: CT-21TF9A_21TF9C_21TF9CP_21TF9CP(IKD)_21TF9CP(SKD)_21TF9CP(M)_21TF9N_21TF9R
Version 1.0

SYSTEM NTSC ADJUST (L108).

2.1.

Tuner AGC connects to GND. Connect Sweep Signal Generator to tuner IF
output terminal oscilloscope V-IN terminal connects to C109. And connect
Q102 'base' pole to the power te9V) of R104 through a 10K resis-

tor.(shown in FIG.2)

2.2.

Apply +20V DC across IC302 as shown in FIG.2.

2.3.

Adjust L108 to obtain waveform as following.

FIG.2

Note: There will be no alignment required for TV without off-air NTSC system feature.

33.4MHz

THE UPMOST POINT 39.5MHz

32.4MHz

38.9M

+20V

MAIN CHASSIS

C109

R104

10k

Q102

L108

203

Summary of Contents for CT-21TF9

Page 1: ...C C Co o ol l lo o ou u ur r r T T TV V V S S Se e er r rv v vi i ic c ce e e M M Ma a an n nu u ua a al l l ...

Page 2: ...TF9CP SKD _21TF9CP M _21TF9N_21TF9R Version 1 0 2 M M Mo o od d de e el l l G G Gr r ro o ou u up p p C C CT T T 2 2 21 1 1T T TF F F9 9 9 CHASSIS 3Y01 MODEL CT 21TF9A CT 21TF9C CT 21TF9CP CT 21TF9CP IKD CT 21TF9CP SKD CT 21TF9CP M CT 21TF9N CT 21TF9R ...

Page 3: ...TF9C_21TF9CP_21TF9CP IKD _21TF9CP SKD _21TF9CP M _21TF9N_21TF9R Version 1 0 3 CONTENTS Specifications 4 X Ray Radiation Precaution 5 Safety Precaution 5 Product Safety Notice 5 Alignment Instructions 6 Schematic Diagram 14 ...

Page 4: ...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 80W Dimension 21 610 W x 482 D x 455 H mm Net Weigh 21 24kg REMOTE CONTROL Transmitting System Infra red Power Supply DC 3V 1 5Vx2 Design and specifications are subject to change ...

Page 5: ...hould 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 ca...

Page 6: ...re the adjustment for main chassis 2 Tools and equipment for adjustment 2 1 Small screwdriver 2 2 Screwdriver without inductance 2 3 Pattern Generator 2 4 DC Regulated power supply 2 5 Digital Voltmeter 2 6 Sweep Signal Generator 2 7 20MHz 2 channel Oscilloscope 3 Signal condition ITEMS LOGO PICTURE CARRIER PATTERN SYSTEM SOUND MODE REMARK 1 CHN 1CH 49 75MHz PHILIPS PATTERN PAL I 1KHz 2 WE 6CH 182...

Page 7: ...ator outputs 38 9MHz R F signal and connects to tuner output terminal or pin5 of saw filter 1 3 Connect Digital voltmeter across C227 DC Regulated power supply positive terminal output 20V to pin1of IC203 and negative terminal of D608 DC Regulated power supply negative terminal connects to pin2 of IC203 1 4 Adjust L203 coil to obtain 3 6V Digital voltage meter reading Fig 1 IC 203 TUNER IF C227 Ic...

Page 8: ... V IN terminal connects to C109 And connect Q102 base pole to the power terminal 9V of R104 through a 10K resis tor shown in FIG 2 2 2 Apply 20V DC across IC302 as shown in FIG 2 2 3 Adjust L108 to obtain waveform as following FIG 2 Note There will be no alignment required for TV without off air NTSC system feature 33 4MHz THE UPMOST POINT 39 5MHz 32 4MHz 38 9M TUNER Ic302 20V MAIN CHASSIS IF C109...

Page 9: ...DE ACCORDING TO 4 4 2 BEFORE WARM UP LINE 2 FOCUS ADJUSTMENT 2 4 Receive monoscope pattern 2 5 Set TV to work in dynamic status 2 6 Adjust the focus knob of FBT to get the clearest picture 3 SCREEN VOLTAGE ADJUSTMENT Go to factory mode MENU 2 status according to 4 4 2 3 4 Select V KILL by pressing CH or PROG and CH or PROG keys 3 5 Press and hold on the VOL key all the time Adjust the screen knob ...

Page 10: ...rd status In factory mode MENU1 adjust V POSITION to obtain picture s vertical center at the center of CRT screen 7 HORIZONTAL CENTERING ADJUSTMENT 7 1 Receive PHILIPS PATTERN Set TV standard status Adjust H PHASE to obtain horizontal center at the center of CRT screen 8 SECAM COLOR DECODER ALIGNMENT 8 1 Receive the GREY SCALE COLOR BAR signals Enter into the factory mode Adjust the values of Seca...

Page 11: ... 1 1 Connect the power cord and connect the signal to RF input 1 2 Check the power supply whether OK or not Switch on the TV set and the LED is on Switch off the TV screen and should not have CRT spot within 3 sec 1 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 br...

Page 12: ...lly located onto the chassis base 3 4 Check all the safety components are firmly located onto the chassis and no damage 3 5 The TV internal side should not see any excess metal materials 3 6 Check all the cable and wire are OK in used 3 7 Check the FBT and switching transformers not high mounting The big ca pacitor are not slanting and high mounting 4 HIGH POTENTIAL TESTING 4 1 Set the mega meter ...

Page 13: ...see the details as following Method to Write Data for Custom Logo The are total 12 characters that can be input into E2 prom and display on the TV The address range of E2 prom 24C04 is from 170H 17BH The following table shows the code input character Character Data Code Character Data Code 0 30H K 4BH 1 31H L 4CH 2 32H M 4DH 3 33H N 4EH 4 34H O 4FH 5 35H P 50H 6 36H Q 51H 7 37H R 52H 8 38H S 53H 9...

Page 14: ...Chassis 3Y01 150V 260V ...

Search results

Summary of Contents for CT-21TF9

Reviews:

Related manuals for CT-21TF9

Brands by name

Popular brands

akira CT-21TF9, Service Manual

Search results

Summary of Contents for CT-21TF9

Reviews:

Related manuals for CT-21TF9

Brands by name

Popular brands