No chorus and distorted SS voicing after noise mod

[Moulashaker]

Thanks for the info. I'll check after work tomorrow as I need to head to bed!

Once again, many thanks for taking the time to help me.

Andy

[MarshallJMP]

Ok

[Gregg]

Maybe not relevant to your unit, but I had a bridge rectifier for the 5V rail become intermittent on one of the MP-2's I fixed for my brother.  Caused a bunch of strange issues including periodic rebooting.

Gregg

[Moulashaker]

These are the regulators by the heatsink. Those brown disc-shaped components. Seemed to have a bit of crusty stuff beneath them. I've cleaned with a cotton bud and IPA.

Will play for a while and see how it goes. The 5V measured at pin 14 of the two chips I replaced is almost exact right now.

[Moulashaker]

The tantalum cap doesn't seem burnt. Just looks like residual paint from the stamp on the side of it.

[Moulashaker]

It's been on over an hour now and no issues. I'm gonna leave it switched on until I go to bed and keep my fingers crossed!🤞🏼

I'll report back tomorrow but many, many thanks to all those who took the time to give me advice! MarshallJMP in particular, of course!

Andy

[Gregg]

If you are still having problems, you might want to consider checking / replacing the diodes that I have outlined as they rectify the AC into DC and feed the 5V regulators.  Per the schematic you care about 2 1N4001 diodes that should be labeled D38 - D39 if I am reading the schematic correctly.  The 2nd from the right in the picture seems to have flux on it so there may have been issues there in the past.  Not a great scan, but better than flying blind.

Gregg