Block Diagram Descriptions
3–8
WFM 601A, WFM 601E, & WFM 601M Service Manual
pro11 kV to the CRT anode. The grid is approximately 75 V negative
with respect to the cathode.
Low frequency blanking information gets to the CRT grid through an amplitude
modulated 200 V
p-p
sine wave from the anode of CR15. Positive level clipping is
set by the CRT Bias adjustment, R53. Negative clipping level is set by the
front-panel INTENSITY control through the Z-Axis Amplifier. The clipped sine
wave is rectified to a DC voltage proportional to the peak-to-peak amplitude and
becomes the CRT control grid bias voltage. DS4 limits the CRT heater to the
cathode voltage.
The Z Axis Amplifier takes a signal from the Main board into the junction of
R10 and R5, which is the summing junction for the amplifier. It is at +5 V
DC
. R5
is a feedback resistor, which sets the amplifier gain at 36 V/mA of input current.
Содержание WFM 601A
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