Goldstar OS-7020 Service Manual page 33

VOLTS/DIV
AdJUSt
ATT
CHl (CH2)
~l 5mV
+10 0.lV
VCJ0l(VC401)
~100 lV
VCJ03(VC403)
@
X-Y
operation
20-1 Check/adjust
X
gain.
a. Set the TIME/DIV switch to X-Y, the input coupling
switch of CHl to AC, the input coupling switch of
CHL to GND.
b. Set the VOLTS/DIV switch to the l0mV position.
c. Connect the standard amplitude calibrator to the
CHl input connector.
d. Set the standard amplitude calibrator for 50mV.
e. Check for a display of five divisions.
f. Adjust the X GAIN adjustment VR608 for a display
of five divisions within
6%.
20-2 Check/adjust X position center.
a. Set the TIME/DIV switch to the X-Y position, and
the horizontal POSITION control to the midposition,
the input coupling switch of CHl to GND.
b. Check to see that the round spot is near the center
graticule and is within ~0.l'division against hori-
zontal line.
c. Adjust the X CENT adjustment VR305 to the position
spot at the center.
20-3 Adjust and repeat in accordance to Par. 20-1-f and
Par. 20-2-C in order to the same as Par. L0-1 and
Par.
20-L.
@
Check/adjust TRIG CENT.
a.
Set the TRIG COUPLE switch to AC, the TRIG SOURCE switch
to CHl, the TRIG SLOPE knob push in, the VOLTS/DIV switch
½o 50mV, the TIME/DIV switch to l0uS.
32