Question about Audio Players & Recorders
Working on half dead Behringer PMP400. Wondering if the fans are supposed to come on when the unit is powered on, or if they are thermostatically controlled. My reason for the inquiry is to deduce whether the PSU or amp board need to be changed. Tested out low voltage power to mixer board and all test out ok, the mixer lights all work fine and the board works fine with an external amp. The high voltage is not present for the amp board, but I hear that these switching PSU's can be tricky to diagnose as they require a load for them to actually switch into operating mode. With this in mind, I figure it can either be the amp board or the PSU. The fans seem to get powered from a winding on the same transformer as the hi voltage mains to the amp board, so if they are supposed to come on without thermostat, then can I safely assume the PSU is culprit. Does anyone know beyond a shadow of a doubt if the fans fire up on power-up?
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Posted on Jan 02, 2017
SOURCE: I have a Carrier 38tra048340
Blank screen sounds like a fried thermosat. Abrupt outages can affect certain types of thermostats. Make a jumper wire and jump across R and G. See if you get any action from anywhere. If a fan or compressor kicks in you know you have a burned out thermosat...
Posted on Jun 23, 2008
yes i agree power supply or you have a short pulling your 24v down do you have 24v at dc power supply trace 24 v down to find drop..
Posted on Jan 21, 2010
It sounds like that unit is connected to a "power saving load controller" device from the power company. The power company can turn your unit on & off with a radio signal. If you manually activated contactor and unit ran. I would bet that the power company's device or the wiring connecting it is where the problem lies. Call the power company and have them check their device. If they tell you that the device has been tested remotely and is working fine. Explain to them that you can activate your unit manually and it works fine. They should not charge you to come out. Those "load controller devices" have a pretty good longevity record.
Posted on Jul 11, 2012
Testimonial: "Thank you. I was not aware that the power company had that ability. I will give them a call and ask about a test of their unit. Last year they sent me a postcard asking if I wanted to participate in their energy saving program. I declined but was not aware that they still had a device attached which could do it. I really hate surprises."
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