Let's Get Technical > All PREAMP Tech Tips & Support

MP-1 with MIDI issue, MP-1 that won't power up PLEASE HELP!!!

<< < (2/3) > >>

Moshefier75:
Not a dumb question at all. Thank you for the suggestions ;)

I tried all those things and yes, both the MP-1 and my Rocktron Intellifex are set to CH1.
MJMP thinks it may be with U4 so I ordered a few replacements just in case. Opto PS900 was determined to be bad so I replaced it and like I said, now it changes channels on both units perfectly but only manually as the footswitcher does nothing.

The struggle continues...

MarshallJMP:
Well that means either the PC900 opto or U4, seems the UART chip is working fine.(output wise that is). But in most cases I had it was U4. (an 74LS04).

Moshefier75:
Ok, great! I ordered a few 74LS04 chips. Funny thing is I hooked it up again and tested it and it started working but it doesn't always work. Sometimes I click on a patch on the footswitch and it'll work and then I'll do it again and it stops working. Based on your experience I think the 74LS04 will do the trick.

I'll keep you all posted. THANK YOU

MarshallJMP:
Okay let us know how it goes. :thumb-up:

Moshefier75:
I will!

The part should arrive this Friday

Thanks again MJMP and rnolan!

Navigation

[0] Message Index

[#] Next page

[*] Previous page