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Thread: Jobo CPE-2 and 3004 drum

  1. #1

    Jobo CPE-2 and 3004 drum

    I just wanted to let anybody interested that contrary to the manual and the info rmation on the Jobo site, the 3004 drum (allowing developing of 4 sheets/paper u p to 8x12") actually fits in the Jobo CPE2. I just got the drum and I was prepar ed to modify the bath to make it large enough but it doesn't need to be. It fits perfectly (barely of course). And for whiever is concerned about the motor not being strong enough, the JOBO CPE2+ has the same motor that the CPP has (the one that was "designed" for the 3000 series drums). So, basically, what I'm saying is that the proffesional drums are actually working with the CPE2.

  2. #2

    Jobo CPE-2 and 3004 drum

    Thanks for the information...I have a CPE2 and process 4x5 in the other sheet film tanks and it's not fun trying to load the film in the dark with those plastic clips, that holds the film in position in the tanks during processing. I'm going to look the into 3004 drums ASAP.

  3. #3

    Join Date
    Aug 1998

    Jobo CPE-2 and 3004 drum

    Great! I've just got a 10x8" back for my camera, and although I'm still waiting for my film, (Kodak Tri-X 10x8" is not imported by Kodak UK so my normal supplier has been waiting weeks for it), I was wondering about the possibilities of using my CPE to process it. I've been using Pyro on my 5x4" negs in a CPE, and would like to be able to use a similar method with the 10x8". I thought I might have to turn to tray processing as I can't afford a CPP at the minute - the Expert drums are expensive enough!

  4. #4

    Jobo CPE-2 and 3004 drum

    A followup. I have to mention that the CPE2 I have (not CPE2+), being the one with the weak motor kinda struggles with the 3004. It rotates it (I had it on for 2 hours) but it looks like it's at its limit. It's true that my CPE2 is very tired anyway and it has sometimes troubles even with the 1520 tank so a unit that functions properly might work even better.

  5. #5

    Join Date
    Jul 1998
    Lund, Sweden

    Jobo CPE-2 and 3004 drum

    I am told that Jobo uses a motor originally sourced as a windscreen wiper motor for Mercedes. Somewhere on the web (ha!) is a page with a part number and instructions for fitting a replacement. Only gotcha: check you don't overload the power supply.

  6. #6

    Jobo CPE-2 and 3004 drum

    Hmmm...the wiper motor thing is interesting, but can a Mercedes wiper motor really be an economical replacement?

    Wonder if I can stick in a GM wiper motor....

  7. #7

    Join Date
    Nov 1999
    San Clemente, California

    Jobo CPE-2 and 3004 drum

    What rotation speed is provided by your CPE-2? Even if it's the same motor as a CPP, my CPE-2+ rotates at 75rpm vs. much slower for the CPP. If your CPE-2 is also turning this fast, the motor will not likely last long, even if it wasn't tired to start with. Most probably the CPP has some gearing to reduce rotation rate; without it, load on the motor would be proportionately greater.

  8. #8

    Jobo CPE-2 and 3004 drum

    After I made some research it seems like it's not the motor that has a problem but the power source. Since I am in fact an electric engineer I will probably change the source with a more powerful one.

  9. #9
    Kevin Kolosky
    Join Date
    Jun 1999

    Jobo CPE-2 and 3004 drum

    Sorin Since you are an electrical engineer I have an interesting question for you. Why is it that when we buy all of these items we have to keep buying the small computers that are in them. or to put it another way, why cannot a motor be somehow hooked up to a computer such that the programs could be put into the computer and away we go. Same for a densitometer. Same for alot of other stuff that requires programming. Why not design things to take advantage of what we all already have so they don't cost so damm much. Kevin

  10. #10

    Jobo CPE-2 and 3004 drum

    Kevin, selling a device that requires a 3rd party computer to run would be IMO very difficult to sell. You'd need long wires to connect it (I don't have a computer in the bathroom), you'd run into compatibility and interference problems and the device would need a dedicated control chip anyway. Overall, it would cost the same.

    In this particular case it's not even a computer, it's just a DC power supply.

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