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9600 Service Manual - gmecorp-usa.com

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13 Video Path<br />

THERMAL PRINTER<br />

Video to the Thermal Printer <strong>com</strong>es from two different sources. The source depends on<br />

whether fluoro x-rays are on or off.<br />

X-Ray Off Condition - In the X-Ray off condition the video signal is supplied by the<br />

Image Processor PCB via D/A converter U2. The video leaves the Image Processor<br />

PCB at P4 pin 9 and is sent to J11 pin 9 on the Video Switching PCB. The video signal<br />

runs through a DC Restoration Clamp (U17) to restore the video sync tips to ground.<br />

The video can be monitored at TP20 (LDAC) on the Video Switching PCB. The video<br />

signal is sent to the video switching matrix where it is routed to mux chip U8 IN2 (pin 9).<br />

The video signal leaves U8 at VOUT (pin 20). See the Video Control Section for more<br />

information on video routing. The video signal from U8 is buffered by amplifier U1 and is<br />

sent to connector J3 pin 5. The video signal can be monitored at TP2 (LVID). The video<br />

signal exits the rear of the electronics box at BNC connector J4 labeled VIDEO below<br />

the 3.5-inch floppy disk drive. The video signal runs from J4 to the Thermal Printer. See<br />

the Peripherals Section for more information.<br />

X-Ray On Condition - In the X-Ray on condition the video signal is supplied by the<br />

CCD Camera via the Video Switching PCB (See Figures 5 and 6). The video signal<br />

enters the Video Switching PCB at J6, is buffered by U4 and runs through a DC<br />

Restoration Clamp (U7) to restore the video sync tips to ground. The video signal can be<br />

monitored at TP10. The video signal is sent to the video switching matrix where it is<br />

routed to mux chip U8 IN0 (pin 5). The video signal leaves U8 at VOUT (pin 20). See the<br />

Video Control Section for more information on video routing. The video signal from U8<br />

is buffered by amplifier U1 and is sent to connector J3 pin 5. The video signal can be<br />

monitored at TP2 (LVID). The video signal exits the rear of the electronics box at J4<br />

(BNC connector) labeled VIDEO below the 3.5-inch floppy disk drive. The video signal<br />

runs from J4 to the Thermal Printer. See the Peripherals Section for more information.

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