Service manual

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10. ELECTRICAL ADJUSTMENTS .
1. ELECTRICAL ADJUSTMENTS
1.1 Supply Voltage Adjustment
Connect a digital voltmeter to the cathode of diode D610 at the AV mode of the TV and set the screen voltage
to the minimum with the screen potentiometer. Adjust the main supply voltage (B+) with P601 potentiometer to
the following value (after supply adjustment, readjust Screen and focus voltage).
21” : 122 VDC (for A51QDX993X030)
2. SERVICE ADJUSTMENTS
To enter the Service Mode, ‘Service In/Out” button on the Service Remote Control or activate the “Picture Menu”
with the user remote control and press “9301” (Press “0” button to exit the Service Mode). To exit from the
service menu, TV/TX button should be typed on the Remote Control.
While the service menu is on screen, version and the date of the software are written on right bottom of the
screen.
For Example:
SK5.256-01 T09
12:07:26
10/03/05 F1
2.1 AGC Adjustment
• Switch to Service Menu
• Find the “AGC METHOD” under “OPTIONS” sub-menu with P+/P-,
• Set its value to “SYNC+PEAK WHITE”.
• Find “AGC” under “IF ADJ.” sub-menu with P+/P-,
• Set its value to “4”
• Find “AGC FOR VHF I” under “IF ADJ.” sub-menu with P+/P-,
• Set its value to “4”
• Set “PIP AGC” topic‘s value to “15”
• Set “PIP AGC FOR VHF I” topic‘s value to “20”
• Exit from the service menu.
2.2 Screen Adjustment
• Switch the TV to the AV mode
• Do not make any connecttion from the scart switch
• Switch on the service menu
• Set the value of “BLUEBLACK” option to “OFF”
• Set the value of the “SCREEN ADJ.” to the indicated value in FACTORY SETTINGS TABLE
• Press “OK” button on the RC
• There should appear a horizontal line on the center of the set
• Adjsut the screen potentiometre to set the line at the first seen point.
• Exit from the service menu