outoftune

AMEK Pure Path CIB Schematic / PSU Help?
« on: August 31, 2017, 09:44:47 AM »
Have one of these units in for repair, not passing audio, seems to be an issue with the PSU. Voltages all read low and jump around, looks like the SMPS.

It's not blowing the fuse, but it does seem to be heating up, and the small fan doesn't have enough voltage to run it.

Inspecting it a bit further I found what looks like a varistor (marked NTC 10) that is measuring as a short, going to keep investigating.

Anyone have a schematic or any help on this?
« Last Edit: August 31, 2017, 10:41:10 AM by outoftune »


outoftune

Re: AMEK Pure Path CIB Schematic / PSU Help?
« Reply #1 on: September 10, 2017, 11:20:39 AM »
it turns out the problem was one of the 0.1uf bypass caps on the opamps, it must have been failing. i left the unit on for a while and the bypass cap smoked, then the unit went back to normal and the voltages came back. removed the dead cap and replaced it and unit is back to working.

sahib

Re: AMEK Pure Path CIB Schematic / PSU Help?
« Reply #2 on: September 10, 2017, 04:07:17 PM »

Good stuff.

The schematics should be in the technical documents.

nilsOhm

Re: AMEK Pure Path CIB Schematic / PSU Help?
« Reply #3 on: March 18, 2020, 09:47:32 AM »
Hi outoftune,
i have an amek pure path that won't light up. first impression was the psu but then i found this post.
do you possibly have any pics of the faulty capacitor?

Best regards,
/Nils