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<blockquote data-quote="Geri O&amp;#039;Neil" data-source="post: 89089" data-attributes="member: 25">Re: PM4000 trouble shooting helpFirst, no, you cannot hot swap modules in the PM4000s (you could on the old PM3000s, can&#039;t believe I remember that). There is a pico fuse that will blow and need replacing. I did it only once. This info comes from one of the great analog console gurus, Rex Ray.Aside from that, it&#039;s pretty easy to pull the modules and then replace them one by one in order from outputs to inputs to see if there is a particular module causing problems. I would do general housekeeping things first. You&#039;ll have to pull all of the modules to perform the following chores. Use star washers on the screws on the back of the module where it screws to the frame (hence, the 4K &quot;Star-ground mod&quot;..<img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f631.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":o" title="Eek!&nbsp; &nbsp; :o"&nbsp; data-smilie="9"data-shortname=":o" />) While the modules are out, tighten everything in sight, especially ground wires that are attached to big copper blocks. Also, check inside the PSU and look for a copper block with ground wires screwed to it (I realize that swapping PSUs didn&#039;t help, but again part of the housekeeping). Again, make sure they are all tight. And I use Caig Deoxit to spray module contacts and their mates inside the frame. From here, I&#039;d start checking individual modules. It&#039;s been a while since I refurbed the ones we had, I&#039;ll post back if I remember anything. I am in no way a guru on these things, I learned what I know from several phone calls with the ever-generous-with-his-time Rex Ray. I tried not to bug him too much, but when I did, I had a notebook and pen ready. Talk about a walking encyclopedia....Geri O</blockquote>

[QUOTE="Geri O'Neil, post: 89089, member: 25"] Re: PM4000 trouble shooting help First, no, you cannot hot swap modules in the PM4000s (you could on the old PM3000s, can't believe I remember that). There is a pico fuse that will blow and need replacing. I did it only once. This info comes from one of the great analog console gurus, Rex Ray. Aside from that, it's pretty easy to pull the modules and then replace them one by one in order from outputs to inputs to see if there is a particular module causing problems. I would do general housekeeping things first. You'll have to pull all of the modules to perform the following chores. Use star washers on the screws on the back of the module where it screws to the frame (hence, the 4K "Star-ground mod"..:o) While the modules are out, tighten everything in sight, especially ground wires that are attached to big copper blocks. Also, check inside the PSU and look for a copper block with ground wires screwed to it (I realize that swapping PSUs didn't help, but again part of the housekeeping). Again, make sure they are all tight. And I use Caig Deoxit to spray module contacts and their mates inside the frame. From here, I'd start checking individual modules. It's been a while since I refurbed the ones we had, I'll post back if I remember anything. I am in no way a guru on these things, I learned what I know from several phone calls with the ever-generous-with-his-time Rex Ray. I tried not to bug him too much, but when I did, I had a notebook and pen ready. Talk about a walking encyclopedia.... Geri O [/QUOTE]

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