GE AMX-II

GENERAL ELECTRIC MEDICAL SYSTEMS . AMX-II X-RAY UNIT
7-1576 SM AO654E
+V HIGH SPEED
SHADED AREA — Q§ CONDUCTS
NN
(274
2
=
Z,
ジグ
OUTPUT
| OF 8A103
Q5 TURN OFF AN N
BIAS VOLTAGE
| DC BIAS
FROM 6R1
0
18789-D10
ILLUSTRATION 6-18
8A1Q6, 7 and 8 amplify the power of the signal from 8A1Q5 before it is applied to the base of 8A 109.
Therefore, the conduction of 841010 determines the current through the motor and the speed of the
motor.
Normal operation at full speed requires a peak motor currents of about 3 amps. If a fault in the drive
system occurs 8A2, R2, R3, R4 prevent excessive motor current and limit the amount of torque dev-
eloped.
When the operator selects reverse, 6GS2 switches in an additional 10Q resistor, 8A2R1 which further limits
the torque developed in reverse.
SEC. 11 OSCILLOSCOPE WAVEFORMS
The oscillograms that follow were made with a Tektronix 422 oscilloscope and a C-30 camera.
For the waveforms, the letter w followed by a number identifies the point in the circuit where the voltage
appears. Using that number and the coordinates given with it, the waveforms may be located on the
schematics in Chapter 7. Traces were taken in standby conditions unless specified otherwise.
6-22