Goldstar OS-7020 Service Manual page 29

d. Adjust the MAG GAIN adjustment VR606 so that one-cycle time
marks
coincide with the ten-division graticule lines.
e.
Push in the POSITION control after adjustment and check.
@
Check/adjust MAG CENT.
a. Set the TIME/DIV switch to
0.
Sms.
b. So that the knob of H. POSITION is pulled out (x10 MAG), the
left end of the trace is brought to the center point and then the
knob of H. POSITION is depressed.
c.
Observe the movement of the left end of the trace.
d. Adjust the MAG CENT adjustment VR607' for the movement of the left
end of the trace within +O. 2 div.
®
Check/adjust low speed sweep accuracy.
a. Set the time mark generator for 5 ms time marks.
b. Set the TIME/DIV switch to
5
ms.
c. Check that the time marks align with the gra.ticule lines over the
middle eight divisions, within )
%.
d. Adjust the 5 ms/DIV adjustment VR609 so that the time marks coincide
with the middle eight graticule lines.
@
Check/ adjust high speed sweep ac c ur acy ,
a. Set the input coupling s.witch to DC.
b.
Set the time mark generator for 5 µs time marks.
c. Set the TIME/DIV switch to
5
µs.
d. Check ti- l at the time marks align with the graticule lines over the
middle eight d iv i s ionjs ,
e. Adjust 'VC601 so that the time marks coincide with middle
eight graticule
lines.
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