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Checking and adjusting
41
7. Square wave response of step attenuator
Turn R6 fully clockwise.
- Connect a square wave voltage of a frequency of 2 kc/s to BU2
- Adjust the square wave response according to the table below:
Position SK3
Adjust with
.03 V/div
C27(see Fig. 18)
.1 V/div
C28(seeFig. 18)
.3 V/div
C29(see Fig. 18)
Check the other positions.
8. Amplitude/frequency characteristic
Turn R6 fully clockwise.
- Set SK3 to position ".01 V/div".
To BU2 apply a sinewave voltage of a frequency of 2 kc/s and an
amplitude such that the picture height is 8 divisions. If the sensitivity
is adjusted correctly (see item 2), the voltage on BU2 must amount to
approximately 28.3 mV
r
.
m
.
s
.
- Increase the frequency of the voltage on BU2 to 200 kc/s, but keep the
amplitude constant. Now the picture height must be at least 6 divisions.
- Check whether a d.c. voltage connected to BU3 is blocked by the built-
in isolating capacitor C26.
9. Hum in the Y amplifier
The hum in the Y amplifier must not exceed 0.2 divisions with SK3 in
position ".01 V/div.".
G. X AMPLIFIER
1. Zero setting
- Set SK4 to position "30 V/div.".
- Adjust the spot to the centre of the screen by means of R5.
- Adjust R757 in such a way that the spot does not move if R7 is turned
(with shorted input).
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