Sunday, April 21, 2013

DURABAND DBTV-2501 - SERVICE MODE - ADJUSTMENTS - ELECTRICAL ADJUSTMENTS - ADJUSTMENTS AFTER MEMORY IC REPLACEMENT


SERVICE MODE
  • This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily.
  • To enter the Service Mode, press both set key and remote control key for more than 1 second.
CONFIRMATION OF USING HOURS
POWER ON total hours can be checked on the screen. Total hours are displayed in 16 system of notation.
  • Set the VOLUME to minimum.
  • Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 1 second.
  • After the confirmation of using hours, turn off the power.
MEMORY IC REPLACEMENT
If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to ensure correct data settings while making reference to TABLE.
  • Enter DATA SET mode by setting VOLUME to minimum.
  • 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.
  • ADDRESS is now selected and should "blink". Using the SET + or - keys on the remote, step through the ADDRESS until required ADDRESS to be changed is reached.
  • Press ENTER to select DATA. When DATA is selected, it will "blink".
  • Again, step through the DATA using SET + or - until required DATA value has been selected.
  • Pressing ENTER will take you back to ADDRESS for further selection if necessary.
  • Repeat steps 3 to 6 until all data has been checked.
  • When satisfied correct data has been entered, turn “Power” OFF [return to standby] to finish data input.
  • The unit will now have the correct data for the new memory IC.
ELECTRICAL ADJUSTMENTS
On-Screen Display Adjustment
  • In the condition of NO indication on the screen.
  • 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.
  • Use the channel UP/DOWN button or channel button (0-9) on the remote control to select the options shown.
  • Press the MENU button on the remote control to end the adjustments.
RF AGC DELAY
  • Receive an 60dB monoscope pattern.
  • Connect the digital voltmeter to R606.
  • Activate the adjustment mode display and press the channel button (02) on the remote control to select "RF AGC".
  • Press the VOL. UP/DOWN button on the remote control until the digital voltmeter is 2.65 ±0.05V.
CUT OFF
  • Adjust the unit to the following settings.
  • R.DRIVE=74, B.DRIVE=56, R.BIAS=68, G.BIAS=85,B.BIAS=64, BRIGHTNESS=135, CONTRAST=100.
  • Place the set with Aging Test for more than 15 minutes.
  • Activate the adjustment mode display and press the channel button (01) on the remote control to select "CUT OFF".
  • Adjust the Screen Volume until a dim raster is obtained.
WHITE BALANCE
NOTE: Adjust after performing CUT OFF adjustment.
  1. Place the set with Aging Test for more than 10 minutes.
  2. Receive the color bar pattern.
  3. Using the remote control, set the brightness and contrast to normal position.
  4. Activate the adjustment mode display and press the channel button (10) on the remote control to select "R.BIAS".
  5. Using the VOL. UP/DOWN button on the remote control, adjust the R.BIAS.
  6. Press the CH. UP/DOWN button on the remote control to select the "R.DRIVE", "B.DRIVE", "G.BIAS" or "B.BIAS".
  7. Using the VOL. UP/DOWN button on the remote control, adjust the R.DRIVE, B.DRIVE, G.BIAS or B.BIAS.
  8. Perform the above adjustments 6 and 7 until the white color is looked like a white.
SUB TINT/SUB COLOR
  1. Receive the color bar pattern. (RF Input)
  2. Connect the oscilloscope toTP024.
  3. Activate the adjustment mode display and press the channel button (16) on the remote control to select "TINT".
  4. Press the VOL. UP/DOWN button on the remote control until the section "A" becomes a straight line.
  5. Connect the synchro scope toTP022.
  6. Press the CH DOWN button once to set to "COLOR" mode.
  7. Press the VOL. UP/DOWN button on the remote control until the red color level is adjusted to 110% of the white level.
  8. Receive the color bar pattern. (Audio Video Input)
  9. Press the TV/AV button on the remote control to set to the AV mode. Then perform the above adjustments 2~7.