Goldstar OS-7020 Service Manual page 22

Horizontal Amplifier
The Horizontal Amplifier circuit provides the output signal to
the CRT horizontal deflection plates. In all positions of the
TIME/DIV select switch except X-Y, the horizontal deflection
signal is a sawtooth from the Sweep Generator circuit. In the
X-Y position, the horizontal de~lection signal is obtained from
the Channel 1 Vertical Preamp through the Trigger Preamp circuit.
In addition, the horizontal amplifier contains the horizontal
magnifier and the horizontal positioning circuits.
Pow~r
Supply
I
The low-voltage Power Supply circuit provides the operation power
for this instrument from five regulated supplies and one unregu-
lated supply. The Power Input stage is provided with a Voltage
Selector Assembly. This selector allows selection of the nominal
operating voltage and regulating range for the instrument.
Calibrator
I
The Calibrator circuit produces
i
square-w~ve output with accurate
amplitude and frequency. This output is available as a squarewave
voltage at the CAL 0.5V(lKHz) connector.
The effect of these input signals is to either incr~ase or deer~
ease the trace intensity, or to completely blank portions of the
display.
CRT Circuit
The CRT Circuit provides the high-voltage and control circuits
necessary for operation of the Cathod-Ray Tube(CRT).
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