Sunday, December 13, 2015

AKAI CFTD2052 SERVICE MODE AND POWER SUPPLY CIRCUIT

AKAI CFTD2052 

SERVICE MODE
This unit is provided with the following SERVICE MODES so you can repair, examine and adjust easily.
To enter to the SERVICE MODE function, press and hold both buttons simultaneously on the main unit and on the remote
control for more than the standard time in the appropriate condition.
INITIALIZATION
PRESS VOL. DOWN AND 1
Initialization of factory data on TV.
NOTE: If you set factory initialization, the memories are reset such as the channel setting, and the POWER ON total hours.
PRESS VOL. DOWN AND 4
Initialization of factory on DVD data.
NOTE: The function will only work without the setting of DVD disc at DVD mode.
 PRESS VOL. DOWN AND 6
POWER ON total hours are displayed on the screen.
Can be checked of the INITIAL DATA of MEMORY IC.
PRESS VOL. DOWN AND 9
Display of the Adjustment MENU on the screen.
PRESS STOP AND 7
Releasing of PARENTAL LOCK.
NOTE: The function will only work without the setting of DVD disc at DVD mode.
CONFIRMATION OF HOURS USED
POWER ON total hours can be checked on the screen. Total hours are displayed in 16 system of notation.
NOTE: If you set a factory initialization, the total hours is reset to "0"..
1.Turn on the POWER, and set to the TV mode.
2.Set the VOLUME to minimum.
3.Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 1 second.
4. After the confirmation of using hours, turn off the power.
WHEN REPLACING EEPROM (MEMORY) IC
1.Turn on the POWER, and set to the TV mode.
2.Enter DATA SET mode by setting VOLUME to minimum.
3.Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 1 second. ADDRESS and DATA should appear
4.ADDRESS is now selected and should "blink". Using the VOL. UP/DOWN button on the remote, step through the
ADDRESS until required ADDRESS to be changed is reached.
5.Press ENTER to select DATA. When DATA is selected, it will "blink".
6.Again, step through the DATA using VOL. UP/DOWN button until required DATA value has been selected.
7.Pressing ENTER will take you back to ADDRESS for further selection if necessary. Repeat steps 4 to 7 until all data has been checked.
8.When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.
After the data input, set to the initializing of shipping.
9.Turn POWER on.
10 Press both VOL. DOWN button on the set and Channel button (1) on the remote control for more than 1 second. After the finishing of the initializing of shipping, the unit will turn off automatically. The unit will now have the correct DATA for the new MEMORY IC.
BEFORE MAKING ELECTRICAL
ADJUSTMENTS
Read and perform these adjustments when repairing the circuits or replacing electrical parts or PCB assemblies.
CAUTION
Use an isolation transformer when performing any service on this chassis.
Before removing the anode cap, discharge electricity because it contains high voltage.
When removing a PCB or related component, after unfastening or changing a wire, be sure to put the wire back in its original position.
When you exchange IC and Transistor with a heat sink, apply silicon grease on the contact section of the heat sink. Before applying new silicon grease, remove all the old silicon grease. (Old grease may cause damage to the IC and Transistor).
Prepare the following measurement tools for electrical adjustments.
1. Oscilloscope
2. AC Voltmeter
3. Pattern Generator
4. Multi-Sound Signal Generator
On-Screen Display Adjustment
1.Set the VOLUME to minimum.
2.Press the VOL. DOWN button on the set and the Channel button (9) on the remote control for more than 1 second to appear the adjustment mode on the screen
3.Use the Channel UP/DOWN button or Channel button (1-0) on the remote control to select the options.
4.Press the TV MENU button on the remote control to end the adjustments.
5.To display the adjustment screen for AV mode, press the INPUT SELECT button on the remote control to set to the AV mode. And, to display the adjustment screen for DVD mode,
6.press the TV/DVD button on the remote control to set to the DVD mode. Press the VOL.DOWN button on the set and the channel (9) on the remote control for more than 1 second.


POWER SUPPLY CIRCUIT 
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