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<blockquote data-quote="Pete Dunn" data-source="post: 214247" data-attributes="member: 14245">On the PRX715 discontinued input/ control panel with the DSP card &#039;PRX700 Full Range V6&#039; manufactured around mid 2013 and no longer available, there is a ribbon cable to a 26 way header; two rows of 13 pins. This carries + and - 15V DC from the power amp/ power supply, audio signal and ground also the centre pin nearest to the edge of the PCB is the enable/ disable line that turns the Class D amp on and off when the DSP thinks it should or if the card fails in service. When the amp is active and the LED is blue there is about 3.3V DC on this line. When the amp is &#039;killed&#039; the line is pulled close to ground. A work-around for a faulty DSP card is to disable the track to this pin on the underside of the DSP PCB. Please note that the indicator LED will turn red indicating stand-by but the amp will continue to operate. The proper fix is, of course, to install the upgraded complete amp module ex. USA: JBL PRX715 Amplifier Assembly JBL 5046365 / 5058666. This including freight is about $AUD600.00 in Australia and is very difficult to obtain.</blockquote>

[QUOTE="Pete Dunn, post: 214247, member: 14245"] On the PRX715 discontinued input/ control panel with the DSP card 'PRX700 Full Range V6' manufactured around mid 2013 and no longer available, there is a ribbon cable to a 26 way header; two rows of 13 pins. This carries + and - 15V DC from the power amp/ power supply, audio signal and ground also the centre pin nearest to the edge of the PCB is the enable/ disable line that turns the Class D amp on and off when the DSP thinks it should or if the card fails in service. When the amp is active and the LED is blue there is about 3.3V DC on this line. When the amp is 'killed' the line is pulled close to ground. A work-around for a faulty DSP card is to disable the track to this pin on the underside of the DSP PCB. Please note that the indicator LED will turn red indicating stand-by but the amp will continue to operate. The proper fix is, of course, to install the upgraded complete amp module ex. USA: [SIZE=3][B][I]JBL PRX715 Amplifier Assembly JBL 5046365 / 5058666.[/I] [/B][/SIZE]This including freight is about $AUD600.00 in Australia and is very difficult to obtain. [/QUOTE]

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