Goldstar OS-7020 Service Manual page 28

. @
Check/adjust astigmatism and FOCUS.
a.
Set the TIME/DIV switch to the X-Y position, and the input coupling
switch to GND.
b. Set the INTENsity control ~or a small. spot, as the. Collowing figure,
using the position controls.
(,:? div )
Spot -
--
.
-
-
. ·1
Screen
div
c. Check that the spot is round.
d. Adjust the FOCUS adjustment and astig. adjustment
VR803
Cor a
round spot.
HORIZONTAL SYSTEM
!Control settings
I
Preset the controls as given in the preliminary control settings.
C:J)
Check/ adjust horizontal gain.
a. Set the input AC-GND-DC to DC.
b. Connect the cable to the output or the time mark generator.
c. Set the time mark generator for
O.
Sms time mai: : ks •
d. Check that the time marks align with the graticule lines over the
center eight divisions, within J
%.
e. Adjust the H GAIN adjustment VR605 so that the time marks coincide
with the middle eight graticule lines.
@;
C-heck/ adjust Horizonta. l x 1 0
M~C
Gain.
a. Set the TIME/DIV switch to O.Sms.
b. Set x
t
O
MAG (pull_ out the knob or the POSITION control).
c. Check that the one-cycle time marks align with the ten-divisions
1raticule lines , within 5 ~.
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