ADJUSTMENTS (continued)
( For authorized personnel only
6. Control & Sync board
6.1 CRTC clock generator
Apply a frequency counter at TP 6
Set BR3 in Test positie ( near by U47 )
Adjust L1 for 7.5 MHz
6.2 Character generator
The characters can be adjusted in highlight ( colour temperature ).
and for the lowlight ( black level ).
Select in " Colour Alignment " ( MENU 6 ).
Press 1
for "Manual with internal signal".
A white window field appears on the tube which corresponds with the highlight value for the
characters.
Adjust P4 on the C&S board for correct black level of the characters.
Adjust P1 on the C&S board for 90 nit Red.
Adjust P2 on the C&S board for 90 nit Green.
Adjust P3 on the C&S board for 90 nit Blue.
6.3 Keyboard led supply voltage
With P6 , the supply voltage of the keyboard leds is adjusted for 3Vdc on the emitter Q29.
6.4 Write start pulse adjustment
Select " Menu " or one of the other functions.
Keep pressing this key and adjust P5 for visual no white steps in the picture.
42
