[BUILD] CAPI 511-VPR~Filtered 500 Series 11 Space Rack~Official Support Thread

[klem]

Can't seem to find this, what is the mA available per slot, and does it change if using SMPS vs. floor PSU?

 

[jsteiger]

Can't seem to find this, what is the mA available per slot, and does it change if using SMPS vs. floor PSU?

The SMPS is 2A per rail divided by 11 so 181mA per slot of course some headroom needs to be factored in. The toroidal transformer is rated at 2.2A with no load. We always figured it would safely provide the 130mA per slot VPR spec with some headroom.

 

[klem]

while on subject, do you have a rough approximation of what a VP28 would draw at ~50% of full gain in mic mode?

 

[jsteiger]

while on subject, do you have a rough approximation of what a VP28 would draw at ~50% of full gain in mic mode?

Maximum worst case should always be less than 75mA

 

[Deadly Mix]

Maximum worst case should always be less than 75mA

While you're hear, when can I get a complete kit for your comp module. I've been in need of 8 of them for like 3 years now

 

[Bertu]

Hi Jeff,
hypothetically speaking, if an inexperienced builder installed the filter caps in reverse and they blew up, what would the correct part numbers be to replace them? Would you be able to share those? We do know the capacitor specs, but are unsure of the physical dimensions and lead spacing.
Thanks!

 

[Deadly Mix]

Hi Jeff,
hypothetically speaking, if an inexperienced builder installed the filter caps in reverse and they blew up, what would the correct part numbers be to replace them? Would you be able to share those? We do know the capacitor specs, but are unsure of the physical dimensions and lead spacing.
Thanks!

Jeff is on vacation until the 22nd. Probably not checking the boards right now. I'm anxiously waiting for him to get back with DB25 lunchboxes and compressors

 

[Volume11]

I have a quick question for you guys before I get home from work and dive into troubleshooting this thing. I’m having issues with channel 8 passing signal through a Reddish EQ. The EQ works in other channels, and I tested a sound Skulptor comp which passed signal just fine. Anyone have any idea where I might start?

Thanks

 

[jsteiger]

I have a quick question for you guys before I get home from work and dive into troubleshooting this thing. I’m having issues with channel 8 passing signal through a Reddish EQ. The EQ works in other channels, and I tested a sound Skulptor comp which passed signal just fine. Anyone have any idea where I might start?

Thanks

Are you 100% sure its the rack and not an outside cable or patchbay issue?

 

[Volume11]

Are you 100% sure its the rack and not an outside cable or patchbay issue?

Yeah, I tried two of the same eqs, and neither would pass signal, unless they were bypassed. Tried a compressor in the slot, and it worked perfectly. Wouldn’t that rule out a cable? I thought that maybe the Eq wasn’t sitting far enough in the slot, so I tried an extender card, but it gave the same results.

 

[jsteiger]

Is this an all XLR or DB25 version?

 

[Volume11]

Is this an all XLR or DB25 version?

It’s the DB25 version, 8th slot. Tried a couple different cables, same issue. Im going to mess with it some more in the morning.

 

[jsteiger]

I would use a DMM to beep from the input side of the DB25 to the rack slot's input and the same for the output. I'd assume you have a short or couple bad solder joints on one or both of the flex PCBs.

 

[Volume11]

I would use a DMM to beep from the input side of the DB25 to the rack slot's input and the same for the output. I'd assume you have a short or couple bad solder joints on one or both of the flex PCBs.

You nailed it! It was a cold solder joint on the output ribbon. Thanks Jeff!

 

[Volume11]

Having more issues with the ribbon cables, on a different box. Everything working great. I moved the units into a new desk. Powered everything on and channels 6,7, and 8 stopped working. Took the 511 rack apart, tested for continuity, and sure enough there were issues. Reflowed solder, and tested again, everything seemed fine. Installed the rack, and now I have issues with all but one channel on 1 - 8. Double checked everything beside the 511 rack, with another 511 rack, to rule anything else out.

Is it possible that the ribbon can get breaks in the traces, or overheated tabs? I’m wondering if the connections break once I reassembled the unit. I checked continuity, once it was reassembled, from the card slots to the db25 jacks, and in between. All of the issues come from the ribbons, at one end or another.

 

[jsteiger]

Having more issues with the ribbon cables, on a different box. Everything working great. I moved the units into a new desk. Powered everything on and channels 6,7, and 8 stopped working. Took the 511 rack apart, tested for continuity, and sure enough there were issues. Reflowed solder, and tested again, everything seemed fine. Installed the rack, and now I have issues with all but one channel on 1 - 8. Double checked everything beside the 511 rack, with another 511 rack, to rule anything else out.

Is it possible that the ribbon can get breaks in the traces, or overheated tabs? I’m wondering if the connections break once I reassembled the unit. I checked continuity, once it was reassembled, from the card slots to the db25 jacks, and in between. All of the issues come from the ribbons, at one end or another.

I guess anything is possible but its really not common. I think you would have to try hard to break a trace on the flex PCB. Hard kink it back and forth a few times which should never happen in reality.