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ldfan · **Posted:** 21 Feb 2021, 21:21

Hi,

I had to check in my LD S2 because of a sound problem : there was sound with Toslink out but not with RCA out : after troubleshooting I saw that some fuses (ICP N38) were burnt : 2 fuses for the DAC power supply : now replaced and working again.

That's a nice easy fix. Wonder why it popped in the first place. That usually would be a bad sign of something. However, I have a weird issue w/ my Boston Acoustics subwoofer constantly popping a fuse every time I unplug the power. After replacing the fuse, it's fine again unitl I unplug the power again. :roll:

So I took the opportunity to take a picture of the AC3 RF circuit : it shows where to place it. No need of such big resistors but I took what I had in my stocks.
LDS2 AC3 RF circuit.jpg

And I figured out that Q2 and Q3 on the schematics are already in the LD S2 (check my first picture with red arrow pointing to mute picking signal), that's why they are not needed. ;)

Not sure if that schematics of the LD-S2 with the transistors really mean the mute switch is built into the board. I've never really totally understood how the mute actually works in the circuit but I know every place I soldered a mute wire to should have a switching 5v point (+5v when disc is paused/stopped and 0v is playing).

Anyway, here are a few pics of my board designs....

My first experimental board (on left) next to the BDE board (right)
https://i.vgy.me/dMTWFy.jpg

My second board shrunken down after I perfected the first one
https://i.vgy.me/rzwjAW.jpg

A size comparison of that board w/ the BDE board again.
https://i.vgy.me/TviTxA.jpg