Jobo ATL-1000 won't heat

Discussion in 'Darkroom Equipment' started by angusgr, Aug 24, 2009.

  1. angusgr

    angusgr Member

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    I'm new here, but I was wondering if anyone has any tips for fixing my processor.

    I have a 110v ATL-1000 which does not seem to heat the water bath. If I warm the water bath to temp externally, the process runs. If I don't, it just sits there forever rotating the drum and neither heating anything nor starting the first step in the process.

    I tested the terminals on the heater element and they seem OK, 17 ohms from memory.

    Does anyone have a Jobo schematic, or any handy troubleshooting info for what might be causing this?

    Thanks!

    - Angus
     
  2. willem

    willem Member

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    I have a manual for the ATL 1500 which applies for a large part the ATL 1000. Do you have this manual yourself already. I can sent it to you , if you want. There is a small section dedicated to appliance troubles.

    Heating up water with my ATL 1000 for the first step in the process can take up to 35 minutes by the way.
     
  3. eclarke

    eclarke Member

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    You have to supply heated/tempered water to the machine.
     
  4. angusgr

    angusgr Member

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    Thanks willem. I emailed Jobo, and they kindly sent me a copy of the ATL-1500 service manual - it has the disassembly procedures, test procedures for the 1500 and schematics for both. Is that the one you mean?

    I've waited a long time, but it's definitely not heating. I have a power usage meter that shows it never uses more than 50W of power, so the heater element is definitely not coming on.

    It seems to sense the temperature fine, because if I give it 38 degree water then it will start (and then the water bath slowly gets cooler as the process runs. Eek!)


    eclarke, I know I need to provide tempered rinse water, but AFAIK the unit it still supposed to be able to heat the water bath and maintain its temperature. Mine doesn't do that. :sad:.
     
  5. angusgr

    angusgr Member

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    I have a theory. There's a part inside the case that looks a bit like a fridge thermostat, with two heavy duty electrical connections. It was showing open circuit when I tested it.

    The service manual talks about a "temperature limiter", and the schematic seems to show it needs to be closed in order for the heater to power up. So I think it might be that.
     
  6. EdSawyer

    EdSawyer Member

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    Look for any sort of thermal fuse or circuit breaker. it sounds like you may have found the part.
     
  7. angusgr

    angusgr Member

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    Oh wow, I can't believe how simple this turned out to be.

    The "fridge thermostat thing" was indeed a thermal circuit breaker. I pulled it out and was looking at it when I noticed it had a big button on top of it. Press the button, breaker resets and goes close circuit. Reinstalled, and I have a heater! A test process is running now.

    Jobo's manual only mentions this in vague passing, so I've attached a photo of where you can find it. It's directly under the control head, so you'll need to pull that off to access it. However, you don't need to remove anything else - you can just press the button on top. Make sure you unplug from the mains before doing anything (obviously.)

    Please excuse camera phone quality. :wink:.

    PS This link is now the first hit for "JOBO ATL-1000 manual" on google, instead of Jobo's actual user manual. How amusing!
     

    Attached Files:

  8. MikeSeb

    MikeSeb Member

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    Now I remember. This thing can be tripped by running the unit dry, or other iniquities. I remember having to reset it on my ATL-1000; I haven't had to do it yet on my 1500.
     
  9. ic-racer

    ic-racer Member

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    Good to see it working again.
     
  10. sv@diycamerakit.com

    sv@diycamerakit.com Member

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    Thank you for posting this. I just got an ATL1000 of ebay and it had this issue. You saved me quite a bit of headache.

     
  11. fschifano

    fschifano Member

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    Well it's good that it will shut itself off before frying itself.
     
  12. Adrijan

    Adrijan Member

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    I am using a Jobo ATL 1500. Running the machine dry by accident will invoke the thermal circuit breaker in order to avoid overheating or burning.
    For a reset you have to remove the top cover around the on/off switch. You can look inside the machine then. Straight down you can see an electronics board. When the machine is running, a red LED will indicate that the heating is on. For a reset you must trigger the reset button with a thin pencil. The reset button is placed on the electronics board.
    Another reason for nil heating can be a malfunction of a little trigger which gets lifted by the waterplane inside the tank. You can find the trigger by grabbing inside the tank. Next to the six bottles containing the chemicals there is a rectangular hole inside the front wall next to the bottom of the tank. Grab inside this hole. The floating trigger is on the right side (the side where the on/off button sits). Move the floating trigger and check the red LED.
    For a repair you can ask the competent and friendly Mr. Seynsche:
    Fotolaborservice K.-D. Seynsche
    Feldstrasse 41
    51702 Bergneustadt
    Germany
    Tel.: +49 (0)2261 41114
    Fax: +49 (0)2261 920158
    Mobil: 0170/4652734
    Email: kds@fotolaborservice.de
    Web: www.fotolaborservice.de
     
  13. Anastigmatic

    Anastigmatic Member

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    Hmm, Adrijan (anybody?) where exactly on that circuit board is the reset button? I cant see it at all! I have the ATL-1500, I can see the red LED but no reset button!
     
  14. Sirius Glass

    Sirius Glass Subscriber

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    I sold a Jobo processor that turned out to be a spare. The previous owner said that the motor and heater were working. When my buyer received it, the motor worked but the heater did not. I had him contact Dave Smith in Los Angeles who walked the buyer through the repair on the telephone. The reset switch had shifted during shipping. By moving it back in place and pushing the connectors on better, it was fully functional again.

    These type of problems are either not written up in the instructions or just glossed over.

    Steve
     
  15. Anastigmatic

    Anastigmatic Member

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    Once I decided to give up, go watch some TV with a glass of wine and stop looking for the reset button on circuit board it suddenly appeared to me!

    Its not on the green circuit board at all! it was in the place like the picture angusgr described, which I too first saw but discounted it early on because the button doesnt push (at all) and I couldnt associate the picture with what I was looking at, I wasnt sure what location the picture was showing (the underneath of unit or from top?) ! I tried to push the button as suggested but its just a solid bit of plastic that no amount of pushing moves it! so I moved on to looking on circut board :confused::blink:

    So, as these things happen, once I sat down and decided not to bother with it the solution came to me and I noticed how the pic resembled the veiw from looking down into the machine, from under the control panel (head?) on the top, disgusted with my solid lump of plastic where everyone else got a button to push (how fair is that!) I pulled my lump of plastic UP and that was the reset switch :laugh::laugh: problem solved and the wine tasted even better :cool:
     
  16. David Nardi

    David Nardi Member

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    Love Apug, love the internet

    My heater in my Jobo ATL 1000 crapped out today between process runs. I had just started to develop my 86 rolls of 35 and 120 from my European 2010 summer trip. Before freaking out and picking up the processor in a fit of rage I decided to see if my good analog friends online had any solutions.

    So it is that I found this thread here and pushed in my little black button as per "angusgr's" post. The button made a warm mechanical click that leads me to believe that my world of analog is safe again once more.

    I will promptly run a test right now and see. I'll keep you posted.

    This scary little moment also made me realize how worthwhile it is to maintain a subscription with Apug to ensure that this generous film community stays around to help us all learn, educate, troubleshoot and share each others experiences with this wonderful medium.

    I'm gonna sign up right now! (even if my processor fails to work).



     
  17. David Nardi

    David Nardi Member

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    It works! I simply removed the 3 screws that keeps the control panel in place, moved it aside and located the reset button in the unit.
     
  18. buzzski

    buzzski Member

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    Many thanks to all the above!

    My ATL 1000 stopped heating and I found this thread - the reset did the trick so many thanks to all who contributed to this thread! FWIW I had put just a bit too little water in to the machine and that tripped the switch - idiot!
     
  19. buzzski

    buzzski Member

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    Aaarrgghh!

    Then half way through the bleach cycle the machine switched itself off - never done that before. Came back on a bit later though - am running a test run just now. Very strange...