Heathkit IO-4550 - Page 28

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BEAM ADJUSTMENTS
Refer to Figure 1 (in the “Illustration Booklet’) for the
circuit component number of any front panel control or
switch.
1, Set the indicated front panel controls as follows:
Y1:
INPUT switch GND
(AC-GND-DC)
VOLTS/CM 50 mV
VARIABLE Fully clockwise (CAL)
POSITION Fully counterclockwise (OFF)
Y2:
INPUT switch GND
(AC-GND-DC)
VOLTS/CM 50 mV
VOLTS VARIABLE Fully clockwise (CAL)
POSITION Center trace on screen
OTHER:
VARIABLE - X5 Fully clockwise (CAL) and pushed
in.
TRIG Y1,+
LEVEL Center of rotation and pushed in.
TRIGGER MODE AC
TIME/CM EXT
HORIZ POS Center spot on screen.
Turn the INTENSITY control counterclockwise to
decrease the brightness of the spot. Readjust this
control as necessary to keep the spot small when you
make the following focus and astigmatism
adjustments. :
Alternately adjust the FOCUS control and the
ASTIGMATISM contro! R427 (a__ screwdriver
adjustment through the rear panel) to obtain the
smallest possible round spot on the CRT screen.
Set the indicated front panel controls as follows:
TIME/CM -1mS
Y2 POSITION Fully counterclockwise (OF F)
Y1 POSITION Center trace on screen
HORIZ POSITION Position trace on screen
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