Jobo CPE-2 motor overhaul
Only after 3 darkroom sessions since I bought it (used, of course), my Jobo CPE-2's motor cried enough. It was always going to be a risk, as when I bought the processor it wasn't running, but this was due to a failed power supply. I had been running it using a 19V 30amp lab supply, so I am pretty sure I had not caused it to fry (after some research, I had found the the jobo CPE-2 supply was 18 volts Max)! What happened is it started to progressively get noisier and then stopped turning.
Anyhow, there was nothing to be lost, so I decided to pull it apart to see why and IF I could fix it.
Below is the exploded view. As you can see, there is plenty of grease in the gearbox
Jobo CPE-2 Motor, Exploded view by hoffy37
Looking at the bell end, you can see quite a bit of black around the brushes, suggesting a lot of arcing
Jobo CPE-2 Motor, Bell End by hoffy37
The can and magnets all look fine, but the can end of the shaft and the bush did seem quite dry
Jobo CPE-2 Motor, Can End by hoffy37
The armature shows a lot of carbon buildup, again suggesting bad contact
Jobo CPE-2 Motor, Armature by hoffy37
And finally, the culprit. My suspicions is that this brush caused the motor to fail finally.
Jobo CPE-2 Motor, Burnt Brush by hoffy37
It looks like the plastic has melted, which has deformed the slot. The brush had been rocking backwards and forwards and would not move freely in the slot. I am surmising that this has caused bad contact, arcing and heat buildup and finally failure.
I tried to clean the arm and the brushes as good as I could and re-assembled the motor. It seemed to spin fine in one direction, but was really sluggish in the opposite. To me, this suggests that the rocking brush is probably the cause for this bad performance. I had thought about working out a way to sleeve the brush slot, but haven't come up with a good solution yet.
But, I have also been looking for replacements. I was wondering whether something like this would be OK (yes, I would be up for some cutting and shutting to get things to fit):
I am afraid that this may be as gutless as the original Jobo motor, as it only gives 0.06Nm at 12V, but it would easily fit(with a bit of fettling)
The other option from this website is a 10W 0.83Nm motor, that will spin at 83rpm @ 12V. This one is a bit more of a tighter squeeze, which will probably mean moving some of the components to get it to fit, but it should be possible
The other thing to note is these motors have 8mm shafts, so I would need to make an adapter.
I hope this at least shows others what the internals look like and hopefully give someone some inspiration (or give me some advice on how to fix this one!)
Last edited by hoffy; 05-29-2011 at 05:11 AM. Click to view previous post history.
Nice post Hoffy. I have an older CPP-2 and occasionally think about what I'll do when it finally craps out. Have you contacted the JoboMan. He seems to be the go to guy for JOBO questions and parts. Maybe he'd be able to point you in the right direction regarding a suitable replacement motor.
ZoneIII has a thread, http://www.apug.org/forums/forum43/4...a-2-owner.html, and he mentions a second possible source for parts/information but I keep getting a DNS error so I'm not sure if the link is good or not.
Thanks for the pictures and good luck with the repairs.
These are the contact details for the former Jobo Plant Manager(?). He is now retired and makes a living repairing and servicing Jobo's equipment. I haven't dealt with him yet, but he might be able to help you.
Klaus Dieter Seynsche
Tel: 02261 – 41114
Thanks rcam and Ralph. I have sent some emails. I'll see what they say and report back.
Klaus probably won’t be able to help you sadly; I contacted him recently to ask about a motor for my cpe2 since it died. He explained that the only option was to buy a motor for the cpe2+ which needs modding to fit the processor case, he sells them for around 100 Euros.
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Actually, that may be a good thing, because the CPE-2 motor was just too weak. I bought a used CPE-2 Plus after my CPE-2 died and I'm much happier with it. It cost me less than 100 Euros by the way, but I wouldn't mind to fit a new motor into the old CPE-2, just in case.
You should be able to buy replacement brushes. Jobo didn't make the motor - if you can find out who did then you may be able to find brush kits.
Haven 't there been several threads regarding windshield wiper motor as a replacement? Relying on a somewhat dubious memory function I believe they were BMW/Bosch 12V.
Junkyard as a source.
What s so special about windshield-wiper motors?
That is for the larger CPA & CPP machines. The CPE seems to be using a much smaller and weaker motor/gear assembly.
Originally Posted by John Koehrer