Macrotech 12000i/9000i overheating problems, ready light offmacrotech 12000i macrotech overheating thermistor ready light firmware update
Posted 04 September 2013 - 01:51 PM
Posted 04 September 2013 - 02:01 PM
The thermistor problem makes the fans race into full speed, you can't ignore the screaming sound comming out of them.
As for the amps ready light not coming on, I'll let my friend Alain elaborate.
Posted 04 September 2013 - 06:50 PM
Posted 04 September 2013 - 06:52 PM
Posted 05 September 2013 - 01:20 AM
But... On your amps, due to their topology, if you lower the signal (lower the volume), the fans will start to work and make the noise you're describing, THIS IS NORMAL AMP BEHAVIOR!!
Posted 05 September 2013 - 06:41 AM
Posted 05 September 2013 - 08:58 AM
WARNING: HIGH VOLTAGE INSIDE!
Make sure that all high voltages are discharged before any manipulations inside the amp.
As for the display's Ready light not coming on, this is 'swap module' time! Do the cards' Ready lights come on? If yes, then it may be possible that the Front End cards are OK.
Verify and measure carefully the output devices for shorts or open device.
[Can I make a suggestion to all you techs working on this type of equipment? I made a small capacitor discharger with a few PTC (positive temperature coefficient) devices. These are the blue, circular resitors that you find in a lot of sample mode power supplies. Usually, they're 6 ohms devices, cold. I solder four of these devices in series (24 ohms total), set these to a banana plug, and set it on my voltmeter (set to DCv). You use the voltmeter to view discharge rate.]
Note: Before swapping cards, identify the cards for their proper channel.
Start off by swapping Front End cards and power up: Do the Ready light change side? If yes, then it may be a faulty Front End card. If no, power off and discharge.
Carefully, swap gate drive cards; Do the Ready light change side? If yes, then it may be a faulty gate drive card. If not, power off and discharge.
Though, since you already have a few units, why not swap whole modules to locate and divide the troubleshooting task?
Posted 08 September 2013 - 07:24 PM
Posted 09 September 2013 - 07:58 AM