QDR
4500 Technical Manual
6-12
LASER PROBLEMS
WARNING:
The laser beam can cause serious retina damage if focused directly into the eye. Be
sure to turn the laser OFF when visually inspecting the shutter and aperture.
When troubleshooting the laser, refer to the following:
Make sure... Refer to...
Shutter is open and not obstructing the beam Page 4-21, Figure 5-12
Motor drives have been calibrated Pages 4-6 to 4-17
If... Suggestions
Laser
does not
turn on
(Software is inhibiting laser when table head is near the laser)
Move the C-arm to the center of the table and retry.
Do the following:
1. Check black and yellow wires from the C-arm interface PCB to the
underside of the Detector Array Assembly
2. Shut off instrument power (switch on console).
3. Disconnect Molex laser power connector.
4. Connect a DVM to the plug coming from the C-arm PCB.
5. Turn laser power on.
6. Check connector for +5VDC. If not, check using SQKEYPAD.
Check C-arm Interface PCB, Signal Distribution PCB, all cables.
Check computer.
At installation only, type “laser safey=0” in SQDRIVER and reboot.
Check AY motor calibration file. If data is corrupt or uncalibrated, laser may not turn
on, despite position of C-arm.
Laser
crosshair
beam is
defective
Check laser block assembly mirrors for breaks, cracks, or misalignment
Check shutter is open
Check aperture is unobstructed
Loosen the laser securing screw to adjust the laser to perpendicularity (see Figure
5-12)
Laser
does not
turn off
Check laser button on control panel
Check control panel laser switch at PANEL$$$> prompt in SQDRIVER
Check for bad:
C-arm assembly
Signal Distribution PCB
Interconnect cable
Computer assembly
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