Akira CT-25XG9-CHASSIS: 5N11(CT-25XG9A, CT-25XG9AN) How to enter the factory mode, adjustments, full schematic, Option codes

Akira 25 inch color TV. Used ICs: STR6656, SE140, AN5891K, TA8256 or TA8246, MSP3410D, MN5198 or MN5199, CD4052, TA8427, 2SC5150(Horizontal Output Transistor), STV5348, 24C04A(Memory)

EEPROM partial initializing

Go to the function set menu (there are two methods: (a / b)

a) Press 'VOL+' key and 'VOL-' key on the control board at the same time and switch on power switch, then go to the function set menu.
After TV is ON; press "factory" key twin then go to the function set menu.

b) Press 'PM' key and 'SM' key on the control board at the same time until the “INITIAL PART OK” appears.

This means the memory having been partially initialized. 

Operate repeatedly if the picture has no change.

All of the TV set EEPROM must be partially initialized before ex-factory or after change of the Chroma IC NN5198 / NN5199 or fully EEPROM initialized after change of the EEPROM 24C04 (OR 24C08,24C16)

Do a search and store.

CHASSIS ADJUSTMENT

PAL system vertical pincushion adjustment.

Receive PAL system cross hatch pattern signal.

Press 'factory' key one time, go to system parameter adjustment menu.

Press 'MENU' key, go to horizontal and vertical parameter adjustment menu.

Select 'V LINE' and 'V SCURVE' by pressing 'PROG+' key and 'PROG-' key.

press 'VOL+' key and 'VOL-' key and adjust corresponding parameter to obtain picture's vertical pin cushion a good status PAL system.

White Balance adjustment: For Factory Auto Computer adjustment

a. Receive white balance test signal.

b. Set picture "MILD" mode.
c. Insert the special plug into CN002, press adjustment key which belongs to white
balance adjustment equipment and go to auto white balance adjustment.
d. After adjustment well, remove the plug.
For Factory Auto Computer adjustment
a. Press 'factory' key one time and go to system parameter adjustment menu.
b. Press "MENU" key once, then go to the White Balance adjustment menu.
c. Press ‘Prog +' key and 'Prog -' key to select the R, G, B cutoff and R, B Driver.
d. Press 'VOL+' key and 'VOL-' key to change. Or using the below direct key
e. Key: 0 for SUB-BRIGHT, 1 for CUTOFF-R, 2 for CUTOFF-G.
3 for CUTOFF-B, 4 for DRIVER-R, 5 for DRIVER-B
f. Recall for toggle the Sub-Bright adjustment (Min. contrast, some CPU version do not work)

Warm up mode

a. Switch on power switch and Press 'factory' key one time.

Switch off power switch and switch on power again.

 At this time there is no signal white raster and TV won't switch off automatically. TV receiver can be sent to warm up line.
b. Before exit warm up line, press 'factory' key three times to continue, at this time exit warm up mode, there is no signal and the LOGO ‘AKIRA’ pattern will appear.
NOTES

Connect the remote IC PIN7 and PIN16 through a jiggle switch on the USER remote handset. 

This switch is defined as "screen" key.

 Connect the remote IC PIN8 and PIN16 through a jiggle switch on the USER remote handset. 

This switch is defined as "factory" key.

On the product line's alignment service we must use special memorizer that has been well written with respective correct version data.

If having no special memorizer that has been well written with data when servicing out of factory, we can use blank new EEPROM. Then the new EEPROM will be automatically initialized with default data after main power switch is on. Most parameters are free-alignment after initialized; only need adjust the several parameters of function set parameter and system parameter adjustment menu.

If no blank new EEPROM or no special memorizer that has been well written with data, we can use memorizer that has been written with old data instead, but must be totally reinitialized; the operation is as following

a) After TV is on, press "factory" key twin, ­then go to the function set menu.
b) Press 'AV/TV' key and 'P.M' key on the control board. 

The TV turns off automatically. This means the memory having been totally initialize. 

Operate repeatedly if the picture has no change.
c) Switch off and exit.
d) After initialized, adjust the several parameters of function set parameter and system parameter adjustment menu.

The parameters of function set parameter and system parameter adjustment menu mustn't be adjusted.

Ensure no adjustment on the following parameter except those parameter mentioned here.

System parameter adjustment menu (This is coming from the NN5198/ NN5199)
AFT
VIF VCO
H VCO
VIFDET NEG
VIFDET INT
VIFDET EXT

The ninth digital and the tenth digital of function set parameter.
These parameters must be IC interior values. 

If the above parameters have been changed, we must partially initialize the EEPROM.

Two different initializing
a) Fully initialize: 

Initialize the EEPROM's most work data and preset default value. Including: work parameter of NN5199, horizontal and vertical parameter, OPTION parameter (via. function set parameter), picture mode parameter, volume mode parameter and white balance parameter.
b) Partially initialize: 

Only initialize work parameter of NN5199 and the ninth digital and the tenth digital of function set parameter(via. ISUD0, ISUD1,ISUD3,ISUD4,ISUD5),preset as interior values.

If use 25 inch or above Pure Flat tube, adjustment of horizontal size and pincushion distortion must be done as follows.

a) Receive 60dBuV PAL system monoscope pattern.
b) Press 'factory' key one time and go to system parameter adjustment menu.
c) Press 'MENU' key and select ' Position Menu ' as below:

Vertical position – 00 to 07

Horizontal position – 00 to 1F

V EHT(vertical shape) – 00 to 0F

H EHT (horizontal shape) – 00 to 0F

Press 'MENU' key and select ' geometry Menu'

Adjust the needy parameters.

Exit system parameter adjustment menu by pressing 'factory' key twin.

Option Codes

Press the 'factory' key twin and go to Option Code Menu

The first digit 8 Digit is set by Factory. The last two digit “9” and “A” is the random data from NN5198/NN5199

Schematic [Click on the pictures to zoom in)