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From Free Knowledge Base- The DUCK Project: information for everyone
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The power supply fan operates on 12VDC. Sometimes when the OEM fan tests good on external power, it could be that under load the fan is not getting sufficient voltage from inside the unit. Under load it has been reported that the voltage measured on a meter dropps from 17v down to 3v. This relates to a problem with the AVR board. Modern computer fans can serve as excellent replacements in the fan is bad.