Calibration; Preliminary Control Settings; Initial Starting Procedure - Goldstar OS-7020 Service Manual

8-4. Preliminary control settings
Set the instrument controls as follows, when starting the calibration
procedures.
Controls Settings
Controls
Settings
FOCUS Midrange
TRACE
ROTATION As desired
- VERT -
V. POSITION Mid r-ange , pushed
in
SWP VAR
Fully clockwise
V. VARIABLE CAL, fully clockwise
INPUT COUPLING
GND.
- TRIG -
(AC-GND-DC)
VOLTS/DIV 5 mV/DIV
TRIG. COUPLE·
AC
V.MODE CH1 LEVEL
Midrange,
Normal
CH2INV · Normal, Pushed in
SLOPE +
Normal
- HORZ -
H. POSITION Midrange MODE
AUTO
-
PULL X10 MAG
~or~al,. Pushed in
TIME/DIV
1 ms
TRIG. SOURCE
CH1
8-5. !nitial starting procedure.
1. Rotate the INTENsity control to the midrange and set the POWER
switch to ON.
2. Wait a few
seconds for the cathode ray tube (CRT) to warm up.
A trace should appear on the CRT.
3. If tz-acedteappeaz-s , increase (clockwise) the INTENsity control
setting
until the trace
is easily
observed, or roughly check/adjust
the DC balance to get a trace as same as
@ •
4. Adjust the FOCUS control for the. best focused display.
5. Readjust the POSITION controls if necessary, to center the trace.