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Hobart Bar Aid 500 not turning on
Hello. Our Hobart is not turning on properly. When i press the power button, light “1” plus the two progress bars light up briefly, and I can hear a relay clicking. Then everything turns off. Happens within half a second.
I measured both secondary windings of the PCB trafo, they were both 15VAC (and I didn’t see much of a dip in voltage when trying to turn on the machine). I also removed all of the relays from the PCB and tested them. They all turn on and off as they should, with close to 0 ohms between the contacts when they are closed. The two (are there more?) 10k NTC sensors measure 11k and 14k, so I suspect they are OK.
What error checks does the PCB do, before staying turned on? Does it check all sensors, pumps, valves, heating elements, etc.? If so, I think it’s a weird design to just turn off without any feedback, when you have all these LEDs and progress bars at your disposal.
I’m thinking more the PCB itself is faulty. Maybe some reset circuitry kicks in, or some voltage regulator, capacitor or similar is causing the microcontroller to either lose power, and it reboots, or some boot condition is not properly met.
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2 Replies
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I can’t find anything on a Bar Aid 500 except that it was replaced 4 designs ago. So it’s old. But if you can find the schematic on it we may have a chance of figuring it out. Two things that come to mind as making it black out quickly are water level sensor and door switch. Is there a Hobart serial model number tag with a ML number?
They also had a strainer sensor, water pressure sensor, booster temp sensor and Salt sensor on some models. That’s why ML is important.
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06760.pdf This should help finding locations.
This one is commissioning; 500-manual.pdf
But they all reference the attached schematic. Often glued inside a cover.
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