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shaun3215
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Posted: Thu Jul 14th, 2011 09:08 pm |
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| you can find a calibration engineer if you google it in your area if you go on snapon site you will able to find your snapon man in your area
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handyman
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Posted: Thu Jul 14th, 2011 12:34 pm |
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Hi, I've just acquired a pair of DGA1800s from a defunct dealership and want to get in touch with a Sun engineer able to test, re-calibrate and repair these machines. Can anyone pass on details of an engineer if he is in the South East? I've been told that Snap-On also offer this service.
I am a small indy, restoring and servicing older Citroen and Peugeot cars. I need to test to MOT standard, but do not need the machines to be locked into the MOT system.
Handyman
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shaun3215
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Posted: Wed Jun 22nd, 2011 07:14 pm |
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| i not to sure try and see if it works but on the forum its when its locked out
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kit1958
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Posted: Tue Jun 21st, 2011 05:04 pm |
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| If I rember right you get stars when the readings are above the range of the gas bench.
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adamgamsa
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Posted: Tue Jun 21st, 2011 02:03 pm |
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shaun3215 wrote: six diget code eg 556677 thanks this is of top of my head thanks
I see. So no-one got to the bottom of this then? It's now an out of date bit of kit (no-one uses it for MOTs anymore, do they?), so maybe the codes will be released one day.
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shaun3215
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Posted: Tue Jun 21st, 2011 12:08 pm |
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| its lock out you will need a code to unlock it but its snapon or someone who can caleribrate the machine for you i have been looking at ways to unlock the machine i have asked the lads on this topic but only one replied and then he stopped so you can only wait the code works of the date if you read the forum so thats all i know its a six diget code eg 556677 thanks this is of top of my head thanks
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adamgamsa
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Posted: Mon Jun 20th, 2011 03:31 pm |
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I have stars where I would have expected readings. But this is with the probe in fresh air; I haven't tried analysis of an exhaust gas yet. Do these stars then disappear, or am I locked out? Did anyone figure this out when this thread was active? Cheers for any help you can offer; I'm just a home bike mechanic hoping to use the DGA to guide me with fuelling - the unit won't be used for MOTs or anything official.
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shaun3215
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Posted: Wed May 25th, 2011 10:14 pm |
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| lets get talking dga 1800 no one has been on there since 09 so what have you mastered about the machine thanks shaun
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shaun3215
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Posted: Wed May 25th, 2011 10:09 pm |
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| not done the vacume with the hose, so how did you manage to bypass the the lock out ,i have got them lock out star's on mine so cannot use it thanks
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MB16
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Posted: Mon May 23rd, 2011 09:06 pm |
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No the leak test is optional. It just boots up, bypass the 10 minute wake up (314159), autocal and straight into the gas test menu. I hooked it up to a logic analyser to try to see what it was doing with the code, but couldn't figure out what to trigger on.
If it is failing the leak test I guess there is a pressure switch somewhere that is either disconnected or loose. You do need a long length of hose to keep the vacuum, I've got about 12 feet of hose on mine. Anything short (couple of feet) probably won't hold enough vacuum.
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shaun3215
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Posted: Sun May 22nd, 2011 10:49 pm |
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| do you still have to do a leak check as well ,mine will not pass the leak check and its out of cal,i have tried blocking the pipes and creating a vacume whilst doing the leak check but still says a leak is present but it holds a good vacume so cannot find any leaks ,so if i could get into the sun service i might be able to reset the machine ,i have found out that the code goes on the date ...
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MB16
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Posted: Tue May 17th, 2011 10:11 pm |
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| I've had mine apart, and downloaded the Eprom content. I will email if you fancy having a go at disassembling. Interestingly I accidentally shorted out the memory while poking around and it stopped saying it was out of calibration...result!! Now good enough to use as just a gas analyser.
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shaun3215
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Posted: Tue May 17th, 2011 09:06 pm |
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| hello i have joined the forum , looking at the password has anyone work it out no one as added any info since 09 so lets get talking to see any advances since then
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MB16
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Posted: Sun Jan 17th, 2010 11:24 am |
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Hi Trev16, any luck with reverse engineering the EPROM code? I'm just thinking about having a go at it myself, but wondered if you have the EPROM content you could send to me? (saves pulling my DGA apart)
Cheers!
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MB16
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Posted: Sun Nov 15th, 2009 12:38 pm |
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The DGA 1800 won't let you change menus when you are testing gases, until the exhaust tube is actually reading valid exhaust gases. No idea why.
Martin
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kev1975
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Posted: Sun Oct 11th, 2009 11:47 am |
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surely if it was working it wouldn't be showing a star for all of the gas levels , gases such as oxygen are present in free air & should therefore show up on the screen .
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Trev16v
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Posted: Sat Oct 10th, 2009 08:04 pm |
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I've now got my machine set up in the house ready to start on this project. What is a little confusing is the fact that the machine seems to operate even though it is most definitely past due for calibration. For instance, it's possible to start the MOT program, and it starts going through the RPM test screens. We can also go into another screen that just shows you all of the gas levels, but for each one it just shows a star in place of the value. However, this is without the probe being anywhere near a car.
My mate actually reckons that you don't actually find out that you're locked out until you actually start trying to measure gas levels with the probe shoved up an exhaust.
I was really expecting it to be a very obvous "out of calibration!" message on the screen as soon as you try to do anything, but clearly that's not the case, so I'd be most grateful if someone could explain where it locks you out.
I'm having to ask this because, with the machine being situated where it is, it's not practical to get a car to it.
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Trev16v
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Posted: Tue Sep 29th, 2009 09:47 pm |
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Ah, interesting - I didn't realise you were talking about another fault with your DGA-1800.
I am an electronics engineer by profession so I'd like to help where I can.
Are you aware of any service manuals being available for these instruments?
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Alfarusty
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Posted: Tue Sep 29th, 2009 08:49 pm |
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Hi Trev, the gas bench i am working on is from the 1800, it is the big module in the main body of the unit just near the fan. It is manufactured by ANDROS, it has a medium sized circuit board on the top ( probably covered in dust) covered in analogue components. It has a ribbon cable connecting it to the analogue I/F board on the side of the chassis. I think the term Gas Bench is a general term . The HCR reading is usually associated with a fault although there is a slim possibility it could be because the motor has seized ( sticks out the end of our unit on a large heatsink ). I think it works by shining a light through the exhaust gas and measuring the output from some sensors that have filters infront of them that are sensitive to the different gases, the motor turns some vanes that enables the sensor outputs to be subtracted from each other to give the readings for each gas. I guess the same may be true for the other analyser you mention but i have not seen inside one. It is probably made from simple components so repairs should be possible but recalibration may be needed afterwards depending on what is changed.
The engineer did warn me about the dangers of moisture in the exhaust fumes causing problems with the gas bench and how some garages try to sniff for head gasket leaks near the radiator header... a bit damp.
Remember to take static precautions when messing with the circuit !
Lloyd
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Trev16v
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Posted: Tue Sep 29th, 2009 02:56 pm |
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Hi Alfarusty,
I now have the EPROM emulator, and as an added bonus my friend already had a 32-pin target adapter to go with it. So hopefully I have absolutely everything I need now. I am hoping to get the machine moved to where I want it and begin work at the start of next week. The emulator is a very nice and powerful machine with good real-time trace functions.
I agree that it's data within the NVRAM that would be modified when the machine is unlocked with the password. The EPROMs are indeed just plain EPROMs (not EE). The thing is, I'm not sure if I have the time or motivation to try to work out what the passwords are; instead, I think I'm just going to aim to modify the firmware within the application EPROM so that the password check is simply defeated (so that it will accept any password you give it, and allow you into the engineer menus so you can reset the calibration yourself), OR perhaps just defeat the calibration check. Really, what method I do just depends on what I can find my way to first. Then, 'unlocking' a machine would be a matter of shoving a modified EPROM in.
By the way, what is the 'Gas bench'? Is it by any chance a unit that is a little smaller and simpler than the DGA-1800, and instead just has loads of 7-segment LED displays on the front for 02, HC, and so on? Is the model number MGA-1200 or something similar to that? The reason I ask is because the father of the guy who has sourced our DGA-1800s also has a machine like I've described, and he is now unable to use it because it just displays a "HCR" calibration code on one of the displays. He says he has been able to use it for literally years but now it just displays HCR. Does this sound like the machine you're working on? I have not looked into this for him yet; I have simply no idea whether this HCR code is due to a fault condition, or because a calibration period has expired. I'm interested to know more about how you're getting on with this.
Cheers,
Trev
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