I have a blown Alpine MRP_M450 and I am trying to get it working. When it was first broken,the LED lit up but there was no output. I replaced the blown IRFZ44N output transistors. Now, no LED and the power transistors (which seem to be working) don't even warm up. Does anybody have the schematics for this model?
I figured out why my LED wasn't working, I got the polarity mixed up.
Voltage to PSU FET's (IRF5305's, right?) reads ~300 mA on the gate and ~700 mA on the source and drain, measured between ground and the respective leg. Value constantly drops the longer I hold the probe there.
I am having trouble identifying a driver without any schematics.
Voltage to PSU FET's (IRF5305's, right?) reads ~300 mA on the gate and ~700 mA on the source and drain, measured between ground and the respective leg. Value constantly drops the longer I hold the probe there.
I am having trouble identifying a driver without any schematics.
Here's the link.Here are a few pictures of the board. If you want close - up's of any area let me know. One of the photos has the transistors labeled.
https://drive.google.com/folderview?id=0B50P1QWuuYzcNFJSSHBxVE1LdVE&usp=sharing
They won't send it to you free of charge. Expect to pay approximately $20 for it.
You should also understand that with complex amps (like this one), having the service manual will not guarantee that you will be able to repair the amplifier.
You need to follow the test procedure on the transistor testing page.
Basic Amplifier Repair - Transistor Test Applet Link
You should also understand that with complex amps (like this one), having the service manual will not guarantee that you will be able to repair the amplifier.
You need to follow the test procedure on the transistor testing page.
Basic Amplifier Repair - Transistor Test Applet Link
I found this manual for an M350, how similar do you think they are?
http://dl.dropboxusercontent.com/u/35219914/-Audio Manuals/Alpine/Alpine MRP-M350.pdf
http://dl.dropboxusercontent.com/u/35219914/-Audio Manuals/Alpine/Alpine MRP-M350.pdf
This is the biggest IC on the board - IC301.
http://www.st.com/web/en/resource/technical/document/datasheet/CD00169483.pdf
This 494 appears to be the controller.
UPC494GS pdf, UPC494GS description, UPC494GS datasheets, UPC494GS view ::: ALLDATASHEET :::
And there is this C847UG microcontroller...
View TMP86C847UG_4107501.PDF datasheet online --- IC-ON-LINE
Is this enough information to go off of? I can trace leads to the best of may ability if need be. Otherwise I'll probably put it up, it isn't worth paying for the service manual.
http://www.st.com/web/en/resource/technical/document/datasheet/CD00169483.pdf
This 494 appears to be the controller.
UPC494GS pdf, UPC494GS description, UPC494GS datasheets, UPC494GS view ::: ALLDATASHEET :::
And there is this C847UG microcontroller...
View TMP86C847UG_4107501.PDF datasheet online --- IC-ON-LINE
Is this enough information to go off of? I can trace leads to the best of may ability if need be. Otherwise I'll probably put it up, it isn't worth paying for the service manual.
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