9600 Service Manual - gmecorp-usa.com

4 X-ray On / Disable
X-RAY ON
X-RAY MODE SWITCH MONITORING
The Technique Processor PCB is informed that an X-ray mode switch is pressed by
monitoring the SECURITY signal discussed previously. In addition, the Technique
Processor needs to determine what X-ray mode switch is pressed. The Technique
Processor accomplishes this by monitoring the Analog Interface PCB PIO U38
pins 10, 11 & 12 according to Table 1.
SWITCH NAME SOURCE SIGNAL NAME
PIO
U38
PIN
SWITCH
PRESSED
LOGIC
LEVEL
X-ray Control X-RAY SWITCH 10 High
Process Fluoro Footswitch X-RAY SWITCH 10 High
Boost Footswitch BOOST 11 High
Scout Fluoro Footswitch FLUORO ONLY 12 High
Process Boost Handswitch BOOST 11 High
Scout Fluoro Handswitch FLUORO ONLY 12 High
Table 1 X-ray Mode Switch Monitoring
When an X-ray mode switch is pressed, the corresponding signals listed in Table 1
becomes a logic high. This high passes through inverting optocouplers U50 and U52 on
the Analog Interface PCB and becomes a logic low. This low is inverted to a logic high
by inverter U25 on the Analog Interface PCB and is read by the Technique Processor
PCB through PIO U38 as indicated in Table 1 above.
X-RAYON SIGNAL
Provided there is no X-ray disable command from the Workstation (See X-RAY
DISABLE for additional information), the Technique Processor PCB acknowledges that
it has identified what X-ray mode switch is pressed and has received the SECURITY
signal by sending a logic low through the Analog Interface PCB PIO U27-24 to ‘or’ gate
U2-2. Since the SECURITY signal out of inverter U24-2 on the Analog Interface PCB is
also a logic low at this time, ‘or’ gate U21-3 output goes low. See SECURITY for
additional information.
This low signal is inverted by ‘nand’ gate U41 pins 12,13 &11 on the Analog Interface
PCB. The logic high output of ‘nand’ gate U41-11 is called XRAYON and is applied to
inverter U6-13 on the X-ray Regulator PCB.
The logic low XRAYON signal output from inverter U6-11 is applied to GAL U35-2. The
logic high output of GAL U35-12 is applied to the kV Drive PAL U7-4 and FIL Drive PAL
U10-2 on the X-ray Regulator PCB. The logic low XRAYON signal, along with
XRAYEN, enables the kV and mA servo loops. See the XRAYEN for additional
information.