Tektronix 455 - Page 177

VOLTAGE CONDITIONS
455/A2/B2
j Voltages shown on this schematic diagram were measured with a Tektronix DM 501 Digital Multimeter. Voltage measurements can vary as
| much as +20%.
No signals were applied to the Vertical or Horizontal modules. The 455 INTENSITY control was set to midrange with the Horizontal
module in the X-Y mode. The Horizontal POSITION control was set so that the horizontal deflection plates were at the same voltage level.
The upper voltages shown on the + Gate circuit were measured with pin 13 of the (A) sweep 1C (in horizontal module) grounded. Calibrator
i circuit voltages were measured with Q382 removed.
| WAVEFORM CONDITIONS
Waveforms below were taken from a Tektronix 7000-series oscilloscope equipped with readout, 7B series Time-Base, 7A13 Diffential Com
parator and a 10X probe. The offset voltages were read directly from the 7A13 in the dc coupled mode. If a different test oscilloscope
system is used, the ac coupled mode may have to be used due to high dc offset voltages. This can cause some waveforms to appear slightly
different. Waveforms may vary as much as ±20%.
The 455 INTENSITY control was set to midrange. The Horizontal Module (A) sweep was free-running.
-S WEEP
PROM
P»220O- 10
Waveforms 7, 8 and 9 were taken using calibrator signal to externally trigger the test oscilloscope.
Remove rear panel assembly to reach points 5 and 6. See Maintenance section for removal instructions.
+SWEEP
PROM
P 2 2 0 0 -q
0» A 6
O
e ___________ o o
20 rriV_
500
IS
Y
rY
~Y
:Y
Yr
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A DR B &
FR O M
C M .8 Q 4
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.2 V
1907-100
4S5/A.
(455 MA