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Looking for Service manual for GE LUNAR DPX-IQ

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Gary Jones

Looking for Service manual for GE LUNAR DPX-IQ

January 13, 2013 09:58

We have a LUNAR DPX-IQ who's arm doesn't park on the correct end of the table, and are in need of the service manual to help us remedy this situation.
If the software version is a deciding factor in which manual is needed, I can get that tomorrow.
I'd be happy to simply have someone suggest how to correct this condition, or share the relevant page(s).
Thanks for any assistance you can provide.

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Harry Foster

re: Looking for Service manual for GE LUNAR DPX-IQ

January 13, 2013 07:01

there is no wrong end of the table, it is a choice for the operator. if you want to change it, go to the root directory, select lunar, then select utilities. there you will find table home position. good luck

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Ken Conerly

re: re: Looking for Service manual for GE LUNAR DPX-IQ

January 14, 2013 10:05

That only works for the Prodigy systems. The DPX series had to be changed by editing one of the configuration files. It has been a while since I did that I can't remember. I will try to research it and get back to you. I don't think it was in the manual. If it is, it is buried.

Ken

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Gary Jones

re: re: Looking for Service manual for GE LUNAR DPX-IQ

January 14, 2013 10:05

There is no sub directory name "Utilities".

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Gary Jones

re: re: Looking for Service manual for GE LUNAR DPX-IQ

January 14, 2013 10:05

Unfortunately, there is no sub-directory by that name.

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hari kumar

re: re: Looking for Service manual for GE LUNAR DPX-IQ

July 19, 2014 09:27

Can any one help me with the ge lunar dpx software plz ......

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Ken Conerly

re: Looking for Service manual for GE LUNAR DPX-IQ

January 14, 2013 10:05

OK, found it. edit the setdpx.bat file using a file editor, change the environment variable HOME_AT_FOOT to either Y or N depending if you want it to home at the Foot or Head End. If the variable isn;t there, you can add it by putting on one line: set HOME_AT_FOOT=Y

I hope this helps.

Ken

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Gary Jones

re: re: Looking for Service manual for GE LUNAR DPX-IQ

January 14, 2013 12:35

You Sir, are a Gentleman and a scholar!
That did the trick, thanks so very much.

Now I have to post a new thread because this hunk-a-junk is failing the Quality Assurance test...one problem fixed, now onto this new one.

BUT...thanks again.

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Ken Conerly

re: re: re: Looking for Service manual for GE LUNAR DPX-IQ

January 14, 2013 03:56

What part is failing? Make sure the standard block is correctly positioned and that the brass disk hasn't fallen out of it. You are welcome for the help. What part of the world are you in?

Ken

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Gary Jones

re: re: re: re: Looking for Service manual for GE LUNAR DPX-IQ

January 14, 2013 05:20

Last week, the "Peak setting" was at 500 units and passed...today, it's at 560 and fails QA.
I was almost obsessive about the positioning of the target, and both disks on the top are in place.
We're in the state of disrepair...Michigan.
Thanks again.

Gary

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Ken Conerly

re: re: re: re: re: Looking for Service manual for GE LUNAR DPX-IQ

January 14, 2013 05:33

OK, well you missed it by 10 points. Peak has to be within 50 of the previous passed QA. There is a pot (I will look it up and get back to you) where you just tweak it clockwise just a hair and that will bring the peak back down. I think it is R12 on the CPU board. It is the HV control for the detector.

Ken

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Ken Conerly

re: re: re: re: re: re: Looking for Service manual for GE LUNAR DPX-IQ

January 14, 2013 05:49

You can e-mail me at xrayrepairdude@gmail.com That should make responses quicker.

Ken

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Harry Foster

re: re: re: re: re: re: re: Looking for Service manual for GE LUNAR DPX-IQ

January 15, 2013 10:03

Ken is absolutely correct about the peak setting. But there is only one pot on the left edge of the SBC board. along the same edge you will find a TP labled HV Feedback. This comes from the detector. You can monitor the feedback if you like, but you are close enough to merely move the pot 1/8 turn and restart the Qa and look at the results then adjust up or down until peak passes.
You only need to start Qa and once you see the results of peak setting, hit F1 to halt QA so you don't wast a lot of time waiting for the end. once peak passes, you will note that your low kev may improve
Sorry for my misdiagnosis about the home position, after you work on CT, MRI, Nuclear andDEXAsince 1974, you get a little confused about the diffrent systems.
by the way, I am also in MI.

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Gary Jones

re: re: re: re: re: re: re: re: Looking for Service manual for GE LUNAR DPX-IQ

January 15, 2013 03:39

I'm grateful for Ken's and your assistance and patience.
I'll be tackling this asap and post an update here... hopefully you'll be able to read the post :-]

Cheers.

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Cristiano Canova

re: re: re: re: re: re: re: re: Looking for Service manual for GE LUNAR DPX-IQ

February 21, 2013 03:23

Hello Harry, I have a DPX-IQ that the Peak Setting changes one week after i fix it. Every week i have to go to the customer. Do you know what can be happening? I replaced the SBC board and the coaxial cable that carries the signal from the detector to AGS board.

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Manuel Casanova

re: Looking for Service manual for GE LUNAR DPX-IQ

January 14, 2013 10:12

If you need please sned email at semmedical@gmail.com

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Harry Foster

re: re: Looking for Service manual for GE LUNAR DPX-IQ

February 21, 2013 10:44

you can monitor the fbk test point on the SBC and will find that the voltage is fluctuating. obviously, it is not the sbc since you have changed it.
monitor the 24v power supply for fluctiations inor noise at the output (common failure) next, monitor the 450v output of the bias supply for fluctiations. it is located at the back of the arm under the back panel. there is an output test point that goes directly to the detector panel. if these are all good, you have a bad detector. these are the easiest steps and go from the cheapest to the most expensive repairs. Your counts must be within 20 of the last passing QA. the counts usually stay very stable within a few counts. AC ripple or voltage fluctuations canon the 24 vdc supply can totally trash your peak setting counts. I hope I understand your problem and this helps you out.

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Ken Conerly

re: re: re: Looking for Service manual for GE LUNAR DPX-IQ

February 22, 2013 08:45

One other thing I would check: Put a voltmeter on the high volt feedback test point on the SBC and move the arm up and down the table. The voltage should not fluctuate very much at all. It usually is in the range of .65 to .7 volts. I have seen the lower cable bundle go bad which can cause the peak setting to fluctuate. I suspect that the shielded feedback cable could be replaced separately since parts are getting scarce for this machine. Harry gave some excellent tips.

Ken

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Harry Foster

re: re: re: re: Looking for Service manual for GE LUNAR DPX-IQ

February 22, 2013 11:38

Great tip Ken. For those not familliar with the system, cable failures are a common problem in all of the lunar systems and some can reallllly lead you down the yellow brick road. Manuel needs to note that he needs to remove the drive belts to do the cable tests

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IngJose

re: re: re: re: Looking for Service manual for GE LUNAR DPX-IQ

December 20, 2013 08:22

hello ken i have a serius problem with a Lunar DPX IQ system with 4.7 e software
first- when i arrived to the room the system has all decalibrated and QA not pass
i have a service manual and follow the collimat alling and tube alling procedures
i can fix some problems
after the peak was out of 50 of last qa then i adjust the r34 in sbc and i can fix this problem now this result is between 700 and 735 and the test pass
but i have a problem with spillover percent it always is out of 10 % 10.7% 10.5% but no minor to 10% never
i dont know if it is posible to calibrate because my service manual refer not this adjust
could you help me

i rewie the database and in 2007 spillover was in 8.45% and each year increase to 10.5 now
do you believe that my detector is damaged?
in advance thanks

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cesar lizarazo

re: re: re: re: re: Looking for Service manual for GE LUNAR DPX-IQ

December 14, 2014 10:40

Hello I have trouble whit this dpx-iq but I don't have the service manual. Can yo helpmeet please. Send it me beatlecal@yahoo.com. Thank you

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IngJose

re: re: re: Looking for Service manual for GE LUNAR DPX-IQ

December 20, 2013 08:22

hello harry i have a serius problem with a Lunar DPX IQ system with 4.7 e software
first- when i arrived to the room the system has all decalibrated and QA not pass
i have a service manual and follow the collimat alling and tube alling procedures
i can fix some problems
after the peak was out of 50 of last qa then i adjust the r34 in sbc and i can fix this problem now this result is between 700 and 735 and the test pass
but i have a problem with spillover percent it always is out of 10 % 10.7% 10.5% but no minor to 10% never
i dont know if it is posible to calibrate because my service manual refer not this adjust
could you help me

i rewie the database and in 2007 spillover was in 8.45% and each year increase to 10.5 now
do you believe that my detector is damaged?
in advance thanks

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xrayrepairdude

re: re: re: re: Looking for Service manual for GE LUNAR DPX-IQ

December 15, 2014 08:32

Yes, the spillover increases over time as the detector deteriorates. The peak setting should be between 500 to 550. If you increase the HV to the detector to decrease the peak value, spillover percentage will increase even further. There is no adjustment to reduce the spillover. If all other QA parameters pass, but the spillover. Then I would replace the detector.

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