Snap-On UHR Ultra, Service Manual, Page: 60 / 84

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Diagnostics
TROUBLESHOOTING THE SYSTEM
The Ultra Aligner can be easily broken down into these major components -
• PC (usb & drivers)
• Power Supply
• Hub PCB (3 on Arago)
• Camera’s (3 on Arago)
• Cables
• USB Motors (Moveable Beam & Arago)
Each of these components need to be working to acquire images for the PC processor to display the images on the
screen for the operator. Should any of these components fail the result could be no images or erratic images.
NOTE: whEN usiNg a TEsT camERa as a TROublE shOOTiNg TOOl always uNplug bOTh cam-
ERas. This will ENablE yOu TO TEsT ThE sysTEm wiThOuT haviNg TO TRaNsfER sEcu-
RiTy cOdEs TO ThE NEw camERa.
USB devices normally require an array of hardware settings that can create conflicts. Debugging becomes a different
process, since USB takes Plug and Play to a new level by allowing multiple devices to share a single path into the PC
such as pointing devices, printers, remote readers and now Ultra Cameras. Troubleshooting USB requires a bit more
effort than other connection methods because the entire bus could be malfunctioning. Examine the troubleshooting
scenarios below until you find one that applies to your situation. These scenarios provide general descriptions of
possible errors, along with steps you can use to resolve the problem. You’ll also find tips for troubleshooting com
-
mon causes of USB failures. Become familiar with using the
“Device Manager”
as a troubleshooting tool. Use the
following sequence to open the “Device Manager”. Hold down both the Windows Key and the Pause/Break Key on
the keyboard. The user can also click on the
<START>
button and right click on
<My Computer>
and select
<Prop-
erties>
.
After opening the “System Properties” click on the
<Hardware>
tab to open the hardware menu.
After opening the Hardware Menu click on the
“Device Manager”
button to open the device manager.
Locate the “Univeral Serial Bus Controller” at the bottom and click on the “+” to view all of the active devices.
USB BASICS
USB controllers are known as root hubs. They’re integrated on the motherboard in most computers. Current moth-
erboards typically have between two and six root hubs, each with at least two headers for connecting ports. Older
computers may only have one hub on the motherboard, or a PC may have an add-on PCI or EISA controller card that
provides USB service. The Ultra Aligner has a Hub PCB that relays information to and from the cameras to the PC
and passes power from the power supply to the cameras. The aligner loads a “Generic USB HUB at startup and must
be present in order to operate the cameras and pass information. The Ultra Arago uses 3 Generic Hubs and each
must be present. Also the camera device drivers must be loaded and will also show up in the device manager. The
conventional will show 2 cameras and the Arago will show either 3 or 4 depending on whether the unit is equipped
with a remote camera. The Ultra Cameras will not show up in the device manager if the Generic USB Hub is not
present. The Ultra Arago will also show 2 USB motors used to drive the camera pods up and down the towers.
Check the Obvious
Before you start troubleshooting a USB problem, double-check your fundamentals. Check to make sure that the
Generic USB hub is loaded, check to ensure that the two Ultra Cameras are loaded, check to ensure USB cables
are physically connected. Confirm that any USB hubs are properly connected and plugged in to powered electrical
outlets. Many failures can be traced to unplugged equipment or devices that are plugged into outlets that aren’t
receiving power. The Ultra Aligner has a dedicated Power Supply for the cameras.
For troubleshooting, you should have an extra Ultra Camera that has tested OK on another computer. You can try
using the device on the PC experiencing the problems to verify that the USB port, not a faulty device or cord, is caus-
ing the trouble. This can be easily accomplished by plugging an extra Ultra Camera directly into the PC’s USB port
on the back of the PC.