Tue Jun 29 2021

Unusual fault with no errors!

C-arm boots normally to 7 segment rotating cw. Collimator does search run ok & completes then there is a beep from the D1 at which point the lifting magnet of the collimator operates & the X-iris opens to maximum, the kv & mA displays at 00 then change to -- D1 replaced, component download completed with generator learning ok, D3 & collimator replaced! Any ideas thanks

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Tue Jun 29 2021Reply from Tomelgy
avatar placemark

Very unusual problem.

With -- on displays, can you release radiation?

If yes is the image OK?

Maybe a problem with TV Camera.

Can you download the log file via SSW?

Tom


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Tue Jun 29 2021Reply from LISTER
LISTER

Hi Tom

Thanks for your reply.

There is no fluoro possible, the LED for the cont' fluoro button does not illuminate and I forgot to mention that you can not step through the Low/mid/high with that button when doing the dose adjustment although it is possible to step the fluoro curves with the MA> button.  (Keyboard has also been exchanged) A new camera was recently fitted for a seperate problem (no BAS) and an image shows when doing dose or collimator asjustments. Error log is very empty although there is sometimes a W902x warning about the footswitch being activated although this has been checked ok along with associated logic signals from D3 to D1.


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Tue Jun 29 2021Reply from outinleft
avatar placemark

When you say "Keyboard has also been exchanged", do you mean the control panel on the C-arm base that is connected to the D1 CPU board via a ribbon cable?

Do you have another monitor cart?  so you can cut the possibilities in half with one test.

Several times I have seen intermitent footswitch errors caused by "sticking" or dirty relay contacts on the D3 PCB. We have replacement D3 boards (both "good-used" D3 PCBs, and D3 PCBs with ALL NEW relays are available)  - wayne@columbiaimaging.com


Wayne Horsman
Columbia Imaging
wayne@columbiaimaging.com
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Wed Jun 30 2021Reply from LISTER
LISTER

Hi Tom

Yes it was the control panel connected ti the D1. Ive just tried another monitor cart but that gave the same results. I could try another D3 but that doesn't explain the X-iris opening to maximum.

Thanks


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Wed Jun 30 2021Reply from outinleft
avatar placemark

There are two components inside the collimator: the x-iris (octagonal lead shutters) and the Slot Diaphragm (two alum. blades). During bott-up, the D1 Host runs them both through a self-test sequence, then puts them in their respective "home postions". The "liftting magnet" switches the Slot Diaphragm from "rotation" mode to "open/close" mode, using the same motor for both movements. Most Slot Diaphragm problems are caused by stripped teeth on the lower ring gear, causing the Slot Diaphragm to opn/close when it is trying to rotate. Most X-iris problems are caused by a bad 5k ohm x-iris follow-pot.  - Wayne Horsman


Wayne Horsman
Columbia Imaging
wayne@columbiaimaging.com
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Wed Jun 30 2021Reply from LISTER
LISTER

Thanks Wayne.

The collimator is completing its search run OK & it calibrated OK. I fitted a new collimator and the fault is the same. I've just fitted a new inverter D2 just in case and have the same problem.


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Wed Jun 30 2021Reply from Tomelgy
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Is the new D1 exactly the same part number? New type verison D1 board/s requires different software.

Has the correct boot & Software been installed into D1?

On the new type D1 PCB's were additional links, if the links are incorrectly set it will do strange things!!!

Wayne Horsman had a good suggestion.

Tom


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Wed Jun 30 2021Reply from LISTER
LISTER

Thanks Tom

D1 is the same p/n, all links are correct although I will check again tomorrow. Boot & software correct for this unit from parameter floppy. Tried another Memoskop today & camera, ruled out diamentor & tube thermal/ pressure. Next step is try a c-arm cable.


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Thu Jul 01 2021Reply from Tomelgy
avatar placemark

Hmmmm

It sound like you have pretty much rules out everything except software and or cable.

Just an off the cuff thought.. I had once an Arcadis Varic with collimator problem at boot-up.

The problem was a wire in main loose going through C-Arm, where the cable enters the C-Bow side, the wires were shorting to chassis. The short was caused by badly cleaned swarf of the C-Bow chassis, unscrew the two allen & closly inspect the insulation for very fine cuts.

Tom


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Wed Jul 07 2021Reply from LISTER
LISTER

Hi Tom

Your going to kick yourself! The unit was in cassette mode.

X45 was connected to X45.A on top of the II feeding 15V through the laser (but not illuminating it) & back down to the CEX relay on D1.

I think we worked together in the 80's, you came up to Liverpool If I remember rightly.

Thanks for your help


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