Akira CT34TP9ATS Color TV CHASSIS-P60 - Service mode, schematic, and service adjustments details

Used ICs - Tuner-XG6VS96A, KA5Q12XRF[SMPS control], M52797SP[Video Audio Switching], TDA9181 [Comb filter], BCK-50-0223[SMPS Transformer], TDA9363PS/N2 OR TDA9365PS/N2 or TDA9384PS/N2 or TDA9386PS/N2 Sycon chroma jungle [Philips], TDA9874[NICAM] TDA9859[Audio control], TDA8944[Stereo Audio amplifier], JF0501-21135[LOT], C5250 [Horizontal Output transistor], TDA4863[Vertical Amp].

Note the following before debug and equipment.
a. The main power is 90~260V/50/60Hz. Please be careful when you debug the equipment.
b. Don’t short any two soldering points, which should not be shorted and don’t touch any component, which should not be touched.
c. Pull out plug before equipment.
d. For safety reasons, all components equipped or replaced should be identical with BOM.
e. Must warm up for 30 minutes or more and degauss CRT thoroughly with demagnetizer before alignment.
f. The data of EEPROM must be stored before the adjustment for main chassis.

Tools and equipments for adjustment

a. Small “-” screwdriver.
b. Screwdriver without magnetic  inductance.
c. Pattern Generator.
d. DC regulated power supply.
e. Digital Voltmeter.
f. Sweep signal generator.
g. 20MHz 2-channel Oscilloscope.
h. Signal condition.

service adjustment

Power adjustment.
Connect a 100W (Filament Type bulb only) across C616. 

Then connect AC 220V power to CN601. 

If the bulb light, the voltage is prescriptive, and there should be no fluctuations in voltage.

If so the power is OK, if not, (SMPS) should be repaired.

Go to factory mode before warm up line.
Method: Press key CLOCK, P.M.’O’ TV SET will go to factory mode.

Press key 0-9 to entering factory menu. Select the item by “PROG+” and “PROG-“keys. Adjust by “VOL+” and “VOL-” Keys.

Press “+” key to exit factory mode.

Focus adjustment.
i. Receive the monoscope pattern.
ii. Set TV to work in dynamic status.
iii. Adjust the focus knob of FBT to get the clearest picture.

Screen Voltage Adjustment (KEY 0)
i. Set TV at “TV” “STANDARD” mode, no signal input.
ii. Press key CLOCK, P.M, “O”in turn to entering factory mode.
iii. Press 0 key.
iv. Adjust the screen knob of FBT to get a horizontal faintness beam line.
v. Press other keys to go to the normal work status.

Horizontal Center and EW adjustment (KEY 1)
i. Received 50HZ monoscope PATTERN. Set TV standard status. Adjust 5HSH to obtain horizontal center at the center of CRT screen.
ii. Receive 50HZ cross hatch pattern. 

Set TV standard status. 

Adjust 5EWW, 5PWW, 5UCR, 5LCR, 5PAR, 5BOW, 5EWT to obtain picture’s Horizontal
display ratio more than 90% in factory mode.

Horizontal parallelogram 50Hz	5PAR
Horizontal bow 50Hz	5BOW
Horizontal shift 50Hz	5HSH
EW width 50Hz	5EWW
EW parabola /width 50Hz	5EWP
EW upper corner parabola 50Hz	5UCR
EW lower corner parabola 50Hz	5LCR
EW trapezium 50Hz	5EWT

Receive 60HZ monoscope PATTERN. Set TV standard status. 

Adjust 6HSH to obtain horizontal center at the center of CRT screen.
iv. Receive 60HZ cross hatch pattern. 

Set TV standard status. 

Adjust 6EWW, 6PWW, 6URC, 6LCR, 6BOW, 6EWT to obtain picture’s Horizontal
display ratio more than 90% in factory mode.

Horizontal parallelogram 60Hz	6PAR
Horizontal bow 60Hz	6BOW
Horizontal shift 60Hz	6HSH
EW width 60Hz	6EWW
EW parabola/ width 60Hz	6EWP
EW upper corner parabola 60Hz	6UCR
EW lower corner parabola 60Hz	6LCR
EW trapezium 60Hz	6EWT

Vertical size and pin cushion adjustment (KEY 2)
i. Receive 50HZ cross hatch pattern. 

Set TV standard status, adjust 5VSL to obtain half of the cross hatch, adjust 5SCL to obtain picture’s vertical pin cushion for a good status, adjust 5VSH to obtain picture’s vertical center at the center of CRT screen in factory mode.
ii. Receive 50HZ monoscope pattern. 

Set TV standard status,. Adjust 5VAM to obtain picture’s vertical display ratio more than 90% in factory mode.

Vertical slope 50Hz	5VSL
Vertical amplitude 50Hz	5VAM
S-correction 50Hz	5SCL
Vertical shift 50Hz	5VSH

Receive 60HZ cross hatch pattern. 

Set TV standard status. 

Adjust 6VSL to obtain half of the cross hatch, adjust 6SCL to obtain picture’s vertical pin cushion a good status. 

Adjust 6VSH to obtain picture’s vertical center at the center of CRT screen in factory mode.
iv. Receive 60HZ monoscope pattern. 

Set TV standard status. 

Adjust 6VAM to obtain picture’s vertical redisplay ratio more than 90% in factory mode.

Vertical slop 60Hz	6VSL
Vertical amplitude 60Hz	6VAM
S-correction 60Hz	6SCL
Vertical shift 60Hz	6VSH

If necessary, adjust Horizontal Center and EW again.
vi. Receive 50HZ RGB or YUV cross hatch pattern. 

Set TV standard status.
Adjust 5RGH to obtain picture’s vertical center at the center of CRT screen in factory mode. (OPTION).
vii. Receive 60HZ RGB or YUV cross hatch pattern. 

Set TV standard status.
Adjust 6RGH to obtain picture’s vertical center at the center of CRT screen in factory. (OPTION).

OSD position adjustment.
i. Menu OSD position adjustment. Received 50/60Hz cross hatch pattern. 

Set TV standard status. 

Press KEY 2 in factory mode, adjust 5VOF /6VOF and HOF item, to obtain menu OSD at the center of CRT screen.
ii. LOGO position adjustment. 

Receive 50/60Hz cross hatch pattern. 

Set TV standard status. 

Press KEY 7 in factory mode, adjust XMIN, XMAX, YMIN, and YMAX item, to obtain LAGO at the center up to 1/3 of CRT screen.
iii. TELETEXT OSD position adjust.  Receive 50/60HZ TELETEXT signal.
Set TV standard status. 

Press KEY 7 in factory in factory mode, adjust TXMI and 5TYM/6TYM item, to obtain INDEX at the center of CRT screen.

White Balance adjust (Applied in factory) (KEY 3)
i. Normally, 5P60 can auto adjust white balance, but for some CRT need to adjust white balance carefully. 

Set BRIGHTNESS and CONTRAST at normal status, receive GREY SCALE and after entering the factory mode press KEY 3, set WPR at 31, adjust WPG and WPR to obtain white balance.

RF. AGC adjustment (KEY 4)
i. Receive 60dB RF signal. 

Connect Digital voltmeter positive terminal to tuner AGC terminal and negative terminal to GND.
ii. Entering the AGC item in factory mode by the REMOTE CONTROL.
Method. Press key CLOCK, P.M. in turn, you can enter into factory mode, then press key “4” and select AGC item by PROG+/-

iii. Adjust “VOL+” and “VOL-” keys to obtain 3.8V Digital voltage meter reading or just no NOISE (Grains) on screen.
iv. Press key “ + ” to exit factory mode.

E2PROM initialization (Key-8)
i. When repairing, we can replace E2PROM by other empty or un-empty E2PROM, but you must initialize E2PROM to avoid unknown things.
ii. Methods:
1. Press remote control KEY CLOCK, P.M. in turn to entering factory mode.
2. Press remote control KEY 8 to entering INIT menu, then press key PROG +, you can see “INIT BUSY” waiting for about 5 seconds till “BUSY” disappeared, then POWER OFF and ON by main power. E2PROM initialization in will be now completed.
iii. Setting the data in E2PROM. When in manufacturing, first you read the data from a good E2PROM 24C08, then WRITE to other E2PROM 24C08.

Default data values

Purity adjustment
1. Before color purity adjustment, warm up the TV set over 15 minutes and fully degausses.
2. Receive pure white signal in AV status and set the TV receiver dynamic.
3. Go to factory mod MENU2. 

After write down the values of R-BIAS and B-BIAS, set the values of R-BIAS and B-BIAS zero.
4. Loosen the clamp screw of the deflection yoke and pull the deflection yoke towards color purity Magnetic loop.
5. Adjust color purity magnetic loop to make the green area at the center of CRT screen.
6. Slowly push the deflection yoke toward the front of CRT and set it where a uniform green field is obtained. Tighten the clamp screw of the deflection yoke.
7. Restore the values of R-BIAS, G_BIAS and B-BIAS.

Convergence adjustment
1. Receive a dotted pattern. 

Set the TV receiver dynamic.
2. Loose the convergence magnet clamper and align red with blue dots at the center of the screen by rotating (R, B) static convergence magnets.
3. Align Red/Blue with green dots at the center of the screen by rotating (RB-G) static convergence magnets.
4. Remove the DY wedges and slightly tilt the deflection yoke horizontally and vertically to obtain good screen.

Schematic-Full