JOBO ATL2 1.6A fuse burn problem

xenotar · Mar 31, 2015

Hello Everyone, I got an ATL2 recently from a lab, it looks brand new, never used, but when I plug in, I can hear the fan running sound, but no display, I checked the fuse and I found the 1.6a fuse (fuse 3) need change,when I change a new one in it and turn on, the fuse immediately burn. does anyone who know this problem ? Can anyone offer advice?many thanks
Lu

nbagno · Mar 31, 2015

My CPP will pop it's circuit breaker if it does not have water. Do you have water in the machine?

xenotar · Mar 31, 2015

nbagno said:
My CPP will pop it's circuit breaker if it does not have water. Do you have water in the machine?

Thanks, atl2 has automatic detector water level, if there is no water in the pool, the heat circuit won't turn on.

I checked all the circuit board from the power board to control board, finally I found a capacitor got shorted,I changed a new one, the problem resolved.

nbagno · Mar 31, 2015

That's awesome

alexburke · Oct 22, 2015

Hello xenotar,

I also recently acquired an ATL 2 from a gentleman that had it in storage for at least 10 years. I plugged it in and it powered up, I started putting in programs and while I was glancing away at the manual the display shut off. I found the 1.6 amp fuse on the right was blown. A new fuse also blows right away. I found a few damaged (rodent bites while in storage) wires in the back to the pump and repaired them, but no wires were touching and the fuse still blows. By chance that you and I have the same problem, do you know which board had the blown capacitor? I've taken a good look at most the boards so far and can't find anything. A touch of corrosion looks like it's made its way down to the lowest board but nothing too concerning. Anyone else had similar problems?

Thanks so much.

Glenn Yee · Dec 4, 2016

alexburke said:
Hello xenotar,

I also recently acquired an ATL 2 from a gentleman that had it in storage for at least 10 years. I plugged it in and it powered up, I started putting in programs and while I was glancing away at the manual the display shut off. I found the 1.6 amp fuse on the right was blown. A new fuse also blows right away. I found a few damaged (rodent bites while in storage) wires in the back to the pump and repaired them, but no wires were touching and the fuse still blows. By chance that you and I have the same problem, do you know which board had the blown capacitor? I've taken a good look at most the boards so far and can't find anything. A touch of corrosion looks like it's made its way down to the lowest board but nothing too concerning. Anyone else had similar problems?

Thanks so much.

Have you fixed your problem yet. I have an ATL 3 with the same issue.

Glenn Yee · Dec 5, 2016

alexburke said:
Hello xenotar,

I also recently acquired an ATL 2 from a gentleman that had it in storage for at least 10 years. I plugged it in and it powered up, I started putting in programs and while I was glancing away at the manual the display shut off. I found the 1.6 amp fuse on the right was blown. A new fuse also blows right away. I found a few damaged (rodent bites while in storage) wires in the back to the pump and repaired them, but no wires were touching and the fuse still blows. By chance that you and I have the same problem, do you know which board had the blown capacitor? I've taken a good look at most the boards so far and can't find anything. A touch of corrosion looks like it's made its way down to the lowest board but nothing too concerning. Anyone else had similar problems?

Thanks so much.

Alex, did you resolve the problem you had with the ATL 2 yet?

Leigh B · Dec 5, 2016

A general comment, not having a copy of the schematic for either machine...

A very common problem with power supplies in vintage equipment is bad filter capacitors.
They can fail shorted or open. If shorted, they usually blow the fuse in the AC line.
The problem is less common in gear that's used regularly, more common in gear that's been stored unused.

This problem is so common that I automatically replace the filter caps in any gear more than 20 years old before I turn it on.

Of course there are other problems that can cause the fuse to blow.
But when the demonstrated failure rate is on the order of 70% or more, I just make an assumption.

- Leigh

DREW WILEY · Dec 7, 2016

First of all, these aren't water heaters. You need to start with water fairly close to your operating temperature, and then your machine needs only a
minor amount of wattage to keep it there. Second, you might want to check your outlet with a good voltmeter for the extent of voltage fluctuations.
Sometimes the utility regulation upstream needs maintenance itself. Capacitors have already been mentioned. But inferior wiring on your premises,
or too many high wattage items in use at the same time, etc, are things to consider.

JOBO ATL2 1.6A fuse burn problem

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