Hi All,
I am working on an Alpine MRX-M50. Does anyone have the service manual on either the MRX-M50 or the MRX-M100, that should be very similar? Perhaps someone else have also experienced the issue I am seeing.
Got the amp with missing power terminal screws. Amp tested fine on low power, but once I got terminal screws installed and higher power connected, it works for a few seconds and then shuts down, with and without a load connected.
None of the outputs are shorted and both channels produced clean/clear audio, before it shuts down. The power supply section seem to use pin4 of the TL494 as protection input, with a PNP pulling it up after a few seconds.
Any advice/help?
Without the manual, trouble shooting the protection circuit is proving difficult.
I am working on an Alpine MRX-M50. Does anyone have the service manual on either the MRX-M50 or the MRX-M100, that should be very similar? Perhaps someone else have also experienced the issue I am seeing.
Got the amp with missing power terminal screws. Amp tested fine on low power, but once I got terminal screws installed and higher power connected, it works for a few seconds and then shuts down, with and without a load connected.
None of the outputs are shorted and both channels produced clean/clear audio, before it shuts down. The power supply section seem to use pin4 of the TL494 as protection input, with a PNP pulling it up after a few seconds.
Any advice/help?
Without the manual, trouble shooting the protection circuit is proving difficult.
