GE AMX-II

GENERAL ELECTRIC MEDICAL SYSTEMS AMX-HX-RAY UNIT
10-377 SM A0654E
SEC. 7 X-RAY EXPOSURE CONTROL
7-1 Off to Ready
The seguence of events leading up. to the READY state are described below.
The X-ray unit is energized by turning on the circuit breaker 6CB1 and the x-ray control switch. The
“power on” lamp will glow. The battery change cord should not be plugged in. The “power on” lamp
and either the “charge on” lamp or the “charge complete” lamp will glow.
Depressing the hand switch ROTOR button energizes relay 3A4K36-B, Illustration 6-12. The 60 Hz In-
verter Power Delay (76, G) will ensure that the inverter driver is functioning 100 ms before battery power
is applied to the 60 Hz Inverter.
The 2.5 sec. delay (79, G) allows the filament to reach operating temperature and the rotor to reach op-
erating speed.
7-2 Ready to Exposure Start
The sequence of events that occur to produce an exposure are shown in Illustration 6-13. These events
presume the unit is in the READY state as described in Sec. 7-1. When 3A1CR28 (85,E) fires capacitor
3A1C3 (84,D) discharges through 3A1CR13, 3A1CR28, 3A1CR63 and 3A6T3. The resulting exposure
start pulse is transmitted to the gate of 2CR2 (39,D) in the inverter ON-OFF circuit. 2CR2 conducts to
complete the 500 Hz inverter circuit and start the exposure.
Note on Illustration 6-13 that three inputs are required to the Synch Pulse Gate before 3A1CR28 fires-
Contact 3A1K7-A, (86, F) activated by X-ray handswitch, removes a ground path from the collector of
3A 1056 (90,F) which is biased on. When the shut off capacitors 1C1 and 1C2 are not charged, 3A1060
will conduct, by-passing the Synch pulse signal and preventing an exposure. A signal from the 500 Hz
Synch pulse generator (49, D) is applied to the base of 3A1056. This signal provides turn-on of 3A1CR28
to step with the 500 Hz inverter pulses.
6-17