McIntosh mp 100 Phone Preamp Problem.... Blinking Red Power Button

I always power down before changing connections.  To me, it only increases bad possibilities to not do so.

That is a pretty nice phono stage.  Once repaired it should serve you well.  Good luck.

Bill

Yes, i think it was powered up when I made the switch. 

… was that it? 

The McIntosh tech asked the same question…. Saying I should make sure it is powered down when doing anything. If that is the case… such sensitive equipment….

r.

Maybe a dumb question, but was the Mcintosh powered up during the interconnect switch?

Bill

Wow… so as it turns out…. The McIntosh shop replaced something having to do with the main power, and then it still wasn’t working. Some sort of resistor… still not working… and now try are waiting for a “small chip” from McIntosh. 

So it’s still being repaired…! 

QUESTION for you all…. How did this happen? I was changing the interconnect to a new custom interconnect when this occurred, could the new custom interconnect shorted the McIntosh preamp to such a degree? 

I am worried that it will finally get fixed, I’ll plug the custom cable in, and it’ll happen again. 

Even though the custom cable seemed to work fine when connected between my DAC and my amp. 

How did this happen? 

Thanks,

Richard

Hello all,

So my amp is getting serviced, and it was apparently two things that failed. The power supply, and some sort of small transistor. It is being repaired. 

QUESTION: This seemed to happen when I was simply swapping out a new custom fabricated interconnect. 

Do you think there is an issue with this interconnect? Or was it a fluke? 

Thanks,

Richard

Yes I did try that already, and did again. No effect. The little red led blinks above the standby / on button and that is all...

And I put in a ticket with McIntosh directly. Any ideas? 

Thanks all, wish me luck.

r

Have you tried this, as explained in the manual:

Reset of Microprocessors
In the unlikely event the controls of the MP100 stop
functioning, the microprocessors can be reset by per-
forming the following:
1. Press and hold in the STANDBY/ON Push-button
until all the Front Panel LEDs start flashing, then
release the STANDBY/ON Push-button.
2. To switch the MP100 back On, press the STAND-
BY/ON Push-button

I thought that might have been the case as well, somehow I caused a short switching interconnects? 

But I am surprised that that could have happened with gear like this...

I bought it used from my brother in law... can I still contact McIntosh? It is only maybe 5-8 years old. 

Any way for me to diagnose? 

Thank you,

Richard

Why not just contact McIntosh?

Unless you would rather take the scenic route, of course.

Could you have possibly shorted something changing interconnects?