43
Subject to change without notice
7
RV1005:
Focus symmetry
– Locate and identify RV1005 on PS-Board.
– Press X-Y pushbutton (IN position).
– Turn the INTENS knob clockwise until the dot is display-
ed.
– Turn the INTENS knob fully clockwise and counter clock-
wise and adjust RV1005 for equal spot size in both (cw and
ccw) conditions, so that the focus point is in midrange
position.
Fully counter clockwise
Fully clockwise
8
R6024:
Astigmatism correction
– Locate and identify R6024 on CR-Board.
– Connect a 1MHz square wave signal with 25mV
pp
at 50 Ω
(HZ22) to input CHI.
– Set time base to 0.1 μs/div.
– Adjust FOCUS control for optimum sharpness.
– Adjust R6024 until the leading edge and the top of the signal
have equal sharpness.
– Recheck range of FOCUS control.
– Adjust FOCUS control for optimum sharpness.
Note: This adjustment affects the CRT defl ection sensitivity!
Correct
Incorrect
(horizontal out of focus)
Incorrect
(vertical out of focus)
Correct focus cw
Correct focus ccw
PS-Board 2
RV1005
RV1003
CR-Board
R6013
RV6024
A d j u s t m e n t P r o c e d e r e H M 3 0 3 - 6
