akira CT-21AZ9, Service Manual

Model No: CT-21AZ9A_21AZ9CP_21AZ9CP(SKD)_21AZ9R_21AZ9R(SKD) 
Version 1.0

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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 set and 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.