Goldstar OS-7020 Service Manual page 34

b. Connect lhe sine-wave generator lo the input connector for a
0.5
div
(50 kHz).
c. Scl t he T IHG LEV
t
L knob lo the nrid po s it io n ,
d. Adjust VR602. so that synchronization is effected on lhe waveform,
0.5
div on the screen.
e. Next, set the TRIG SLOPE lo - (pulled out state) and insure that
the waveform is triggered, After confirmation, leave the TlUG
SLOPE in depressed state. Readjust when stepped out.
@
Check/Adjust DC T~IG.
a. Set the TRIG. COUPLE switch to DC, the
TRIG.
SOURCE to CHl, the VOLTS/DIV. to 50mV, the
TIME/DIV. to l0uS.
b. Connect the sine-wave generator to the input
connector of CHl for a 0.5 div(50KHz).
c. Set the TRIG. level knob to the midposition.
d. Adjust VR306 so that synchronization is effected
on the waveform, 0.5 div on the screen.
e. Next, set the TRIG. SLOPE to - (pull out state) and
insure that the waveform is triggered.
After confirmation, leave the TRIG. SLOPE in depre-
ssed state.
Readjust when stepped out.
f. Repeat from a toe in CH2 with VR405 instead of
VR306.
33