The adjustment procedure described here can be used as a guide to 80% models of JVC CRT based color televisions.
How to enter Service Mode
To
enter the Service Mode, press both set key and remote control key for more than
1 second.
Service mode table
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
Remocon code selection.
NOTE: If you perform the remocon code selection, the remocon cannot be used. So,do not select the remocon code for the normal servicing.
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.
WHEN
REPLACING EEPROM (MEMORY) IC
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.
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 VOL. UP/DOWN button 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 VOL. UP/DOWN button 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 MODE) to finish DATA input.
Press ENTER to select DATA. When DATA is selected, it will “blink”.
Again, step through the DATA using VOL. UP/DOWN button 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 MODE) to finish DATA input.
The
unit will now have the correct DATA for the new MEMORY IC.
SMPS
System control
Chroma
Deflection
Audio
WHITE
BALANCE
NOTE: Adjust after performing CUT OFF adjustment. Place the set with Aging Test for more than 10 minutes. Receive the gray scale pattern from the Pattern Generator. Using the remote control, set the brightness and contrast to normal position.
Activate the adjustment mode display.
Press the channel button (13) on the remote control to select “R. BIAS”.
Press the CH. UP/DOWN button on the remote control to select the “R. BIAS”, “G. BIAS”, “B. BIAS”, “B. DRIVE” or “G. DRIVE”.
Adjust the VOL. UP/DOWN button on the remote control to whiten the R. BIAS, G. BIAS, B. BIAS, B. DRIVE, and G. DRIVE at each step tone sections equally.
Perform the above adjustments 5 and 6 until the white color is looked like a white.
NOTE: Adjust after performing CUT OFF adjustment. Place the set with Aging Test for more than 10 minutes. Receive the gray scale pattern from the Pattern Generator. Using the remote control, set the brightness and contrast to normal position.
Activate the adjustment mode display.
Press the channel button (13) on the remote control to select “R. BIAS”.
Press the CH. UP/DOWN button on the remote control to select the “R. BIAS”, “G. BIAS”, “B. BIAS”, “B. DRIVE” or “G. DRIVE”.
Adjust the VOL. UP/DOWN button on the remote control to whiten the R. BIAS, G. BIAS, B. BIAS, B. DRIVE, and G. DRIVE at each step tone sections equally.
Perform the above adjustments 5 and 6 until the white color is looked like a white.
HORIZONTAL
POSITION
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast to normal position.
Activate the adjustment mode display and press the channel button (04) on the remote control to select “H. POSI”.
Press the VOL. UP/DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on right and left becomes minimum.
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast to normal position.
Activate the adjustment mode display and press the channel button (04) on the remote control to select “H. POSI”.
Press the VOL. UP/DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on right and left becomes minimum.
VERTICAL
POSITION
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast to normal position.
Activate the adjustment mode display and press the channel button (05) on the remote control to select “V. POSI”.
Press the VOL. UP/DOWN button on the remote control until the horizontal line becomes fit to the notch of the shadow mask.
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast to normal position.
Activate the adjustment mode display and press the channel button (05) on the remote control to select “V. POSI”.
Press the VOL. UP/DOWN button on the remote control until the horizontal line becomes fit to the notch of the shadow mask.
VERTICAL
SIZE
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast to normal position.
Activate the adjustment mode display and press the channel button (07) on the remote control to select “V. SIZE”.
Press the VOL. UP/DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on upside and downside becomes 10 2%
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast to normal position.
Activate the adjustment mode display and press the channel button (07) on the remote control to select “V. SIZE”.
Press the VOL. UP/DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on upside and downside becomes 10 2%
VERTICAL
LINEARITY
After the adjustment of Vertical Linearity, reconfirm the Vertical Position and Vertical Size adjustments.
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast to normal position.
Activate the adjustment mode display and press the channel button (09) on the remote control to select “V. LIN”.
Press the VOL. UP/DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on upside and downside becomes minimum.
After the adjustment of Vertical Linearity, reconfirm the Vertical Position and Vertical Size adjustments.
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast to normal position.
Activate the adjustment mode display and press the channel button (09) on the remote control to select “V. LIN”.
Press the VOL. UP/DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on upside and downside becomes minimum.
BRIGHTNESS
Activate the adjustment mode display and press the channel button (16) on the remote control to select “BRI. CENT”.
Press the VOL. UP/DOWN button on the remote control until the brightness step No. becomes “50”.
Receive a broadcast and check if the picture is normal.
Press the INPUT button on the remote control to set to the AV mode. Then perform the above adjustments 1~3.
Press the INPUT button on the remote control to set to the CS mode. Then perform the above adjustments 1~3.
Activate the adjustment mode display and press the channel button (16) on the remote control to select “BRI. CENT”.
Press the VOL. UP/DOWN button on the remote control until the brightness step No. becomes “50”.
Receive a broadcast and check if the picture is normal.
Press the INPUT button on the remote control to set to the AV mode. Then perform the above adjustments 1~3.
Press the INPUT button on the remote control to set to the CS mode. Then perform the above adjustments 1~3.
Fixed
Value
TINT/COLOR
CENT
Receive the color bar pattern. (RF Input)
Connect the oscilloscope to TP806.
Using the remote control, set the brightness, contrast, color and tint to normal position.
Activate the adjustment mode display and press the channel button (26) on the remote control to select “TINT”.
Press the VOL. UP/DOWN button on the remote control until the section “A” becomes a straight line
Connect the oscilloscope to TP805.
Press the CH DOWN button 2 times to set to “COL. CENT” mode.
Adjust the VOLTS RANGE VARIABLE knob of the oscilloscope until the range between white 100% and 0% is set to 4.4 scales on the screen of the oscilloscope.
Press the VOL. UP/DOWN button on the remote control until the red color level is adjusted to 115 ± 10% of the white level.
Receive the color bar pattern. (Audio Video Input)
Press the INPUT button on the remote control to set to the AV mode. Then perform the above adjustments 2~9.
Press the INPUT button on the remote control to set to the CS mode.
Activate the adjustment mode display and press the channel button (26) on the remote control to select “TINT”.
Press the VOL. UP/DOWN button on the remote control until the tint step No. becomes “50”.
Press the CH DOWN button 2 times to set to “COL.CENT” mode.
Press the VOL. UP/DOWN button on the remote control until the color step No. becomes “62”.
Receive the color bar pattern. (RF Input)
Connect the oscilloscope to TP806.
Using the remote control, set the brightness, contrast, color and tint to normal position.
Activate the adjustment mode display and press the channel button (26) on the remote control to select “TINT”.
Press the VOL. UP/DOWN button on the remote control until the section “A” becomes a straight line
Connect the oscilloscope to TP805.
Press the CH DOWN button 2 times to set to “COL. CENT” mode.
Adjust the VOLTS RANGE VARIABLE knob of the oscilloscope until the range between white 100% and 0% is set to 4.4 scales on the screen of the oscilloscope.
Press the VOL. UP/DOWN button on the remote control until the red color level is adjusted to 115 ± 10% of the white level.
Receive the color bar pattern. (Audio Video Input)
Press the INPUT button on the remote control to set to the AV mode. Then perform the above adjustments 2~9.
Press the INPUT button on the remote control to set to the CS mode.
Activate the adjustment mode display and press the channel button (26) on the remote control to select “TINT”.
Press the VOL. UP/DOWN button on the remote control until the tint step No. becomes “50”.
Press the CH DOWN button 2 times to set to “COL.CENT” mode.
Press the VOL. UP/DOWN button on the remote control until the color step No. becomes “62”.
