Question about Tascam 2488 Portastudio Multitrack Recorder System

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Mic/line inputs Yamaha md8 Multitrack recorder not working

(not a tascam)
I have a Yamaha md8 Multitrack recorder and the phantom powered mic inputs (1+2) are not working - the normal 1/4" jack inputs are working fine but the mic/line inputs which are phantom powered are not. Can you tell me how to fix this?
I have looked for a service manual /circuit diagram but cannot find one.
Can you help?
Thanks
Ljinno

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  • 4,234 Answers

A little testing is required to nail this down.

1) Will a standard mic work in either channel?
2) Will a line level source work in either channel?

It is likely that either the power supply for the phantom power or the supply for the mic pre-amp IC has failed or the IC itself has failed. If a standard mic works, then it is the phantom power supply that is faulty.

I am not aware of any service manual available other than from Yamaha directly (for a price of course...)

If you can update this with the test results, perhaps we can walk through this repair.

Dan

Posted on May 12, 2010

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