Tektronix 475 - Page 229

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475 Service
d) d) Set the Test Oscilloscope: Vertical Mode to ADD, CH 2
to invert, both Volts/Div switches to 5 mV.
e) Connect two X10 probes from the Test Oscilloscope to
the preamp side of the delay line.
f) Adjust CH 1 2 mV Gain Adjustment, R195 (see new Fig.
5-12) for a 250 mV (Peak-to-Peak) display on the Test
Oscilloscope.
g) FSemove the X10 probes from delay line.
h) Adjust Vertical Output Gain Adjustment, R449 (see Fig.
5-13) for 5 divisions of deflection.
i) Set the CH 1 VOLTS/DIV to 5 mV and adjust the
STANDARD AMPL. CALIBRATOR for a 20 mV output.
j) Adjust-CH 1 5 mV Gain Adjustment, R165 (see new Fig.
5-12) for 4 divisions of deflection.
k) CHECK-Accuracy of the CH 1 Volts/Div switch using the
settings given in Table 5-6. The deflection factor accuracy
for each position must be within 3%.
24. Adjust CH 2 Gain (SN B030000-up)
a) Set the Vert Mode switch to CH 2, the CH 2 Volts/Div
switch to 2 mV, and AC-GND-DC switch to DC.
b) Move the test signal to the CH 2 input.
c) Adjust the STANDARD AMPL. CALIBRATOR for 10 mV output.
d) Adjust-CH 2 2 mV Gain, R295 for 5 divisions of deflection.
e) Set the CH 2 Volts/Div switch to 5 mV and adjust the
STANDARD AMPL. CALIBRATOR for 20 mV output.
f) Adjust-CH 2 5 mV Gain Adjustment, R265 (see new Fig. 5-14),
for 4 divisions of deflection.
g) CHECK-Accuracy of the CH 2 Volts/Div switch using the settings
given in Table 5-6. Deflection factor accuracy must be within 3%
in all positions.
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