GE_OEC_9600_C-Arms

Image System 19
IMAGE INTENSIFIER POWER
Power to the Image Intensifier is supplied during the boot sequence, after the +24V
interlock is complete. The interlocked +24V is placed on the high side of the coil of K7
on the Power/Motor Relay PCB. The return path for the coil is pulled low by the signal
“II_ON” from the collector of Q6 on the Analog Interface PCB. The output at pin 24 of
PIO U38 turns on transistor Q6. With Q6 turned on, the ground path is created through
the emitter of Q6. K7 is then energized and +24V from PS2 passes through to the
image intensifier power supply. The Image Intensifier is turned off during the FILM mode
by placing a low at the base of Q6.
FIELD SELECTION
Field size instructions are written over the serial communications link from the
Technique Processor to the Image Function PCB. They are input to U17 and then
communicated to the microcontroller. The information is sent to the output latch, U6.
The relays K1 and K2 on the Image Function PCB are used to set up the MAG1 and
MAG2 field sizes on the Image Intensifier. Both K1 and K2 coils (pin 1) are provided with
+24V (+24/II) after K7 on the Power/Motor Relay PCB is energized. The return path for
the coils is described below.
Normal Mode
The NORMAL (9”) field size is the default at boot-up of the system. Neither K1 nor K2 is
activated when the NORMAL mode is selected and the II receives +24V (+24/II) from
the Image Function PCB at P4 pin 7 (Asy. #00-874752) or P2 pin 110 (Asy. #00-
878400).
MAG 1 Mode
When MAG1 is selected, output latch U6-15 goes high, turning on transistor Q2. Relay
K2 is energized and +24 VDC passes through K2 pins 2 to 4, and through K1 pins 7 to
6, leaving the Image Function PCB at P4 pin 6 (Asy. #00-874752) or P2 pin 5 (Asy. #00-
878400). The +24V is then routed to J7 pin 3 for the internal II high voltage power supply
where it configures the II for the 6-inch field size. Jumper E1 must be in place for proper
operation of the MAG1 and MAG2 field selection.
MAG 2 Mode
When the MAG2 is selected, output latch U6-14 goes high, turning on transistor Q1.
Relay K1 energizes and +24 VDC passes through K1 pins 4 to 2, leaving the Image
Function PCB at P4 pin 5 (Asy. #00-874752) or P2 pin 9 (Asy. #00-878400). The +24V
is then routed to J7 pin 7 for the internal II high voltage power supply where it configures
the II for the 4.5-inch field size. Jumper E1 must be in place for proper operation of the
MAG1 and MAG2 field selection.
IMAGE INTENSIFIER / POWER SUPPLY REMOVAL