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I've also been looking HD500 schematic, but never got it.
You can use X3L schematic as a reference and compared.
Some sections of the X3L diagram, similar to the HD500.
By the way, what is the problem with your HD500? Maybe I can help or share.
25897258-xykdzr1cdriwl1tmr4ngy0qt-1-0.jpg X3L

Line 6 POD HD500... | Answered on Jan 17, 2019

Make sure the volume and master volume are turned up. Try the amp with a different cabinet and a known good speaker cable. If you get sound, it's your speakers or your speaker cable.
If still no sound, you need your amp serviced.

Line 6 Music | Answered on Oct 20, 2018

I suspect the power cord or it's connector is fasulty. That wouldbe the easyiest fix.Past that, it would need to go to an authourized Line 6 repairman.

Line 6 Spider... | Answered on May 28, 2018

I would like tone port ux2

Line 6 TonePort... | Answered on Mar 14, 2018

It sounds like the pots need replacing if re-soldering didn't work. i would take it to a Line 6 authorized service center.

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Line 6 New Line... | Answered on Sep 02, 2017

Leaking capacitors on the pre amp/processor board. Very common in older battery powered equipment. They produce a nice product at a fairly hefty price and then skimp on the quality of component.

Line 6 Variax... | Answered on Aug 29, 2017

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