Line6 LowDown LD15 schematic needed

[MarkusBass]

I'm looking for Line6 LD15 bass amp schematic. The amp is farting (as it should be with this power - 15W and a bass guitar). It does not seem to be a problem with the speaker. I found out that until 15W everything is OK with the amp. When I increase signal, the opto-limiter is not limiting the signal (although the amp shows that the threshold for the limiter is achieved). It looks like problem with the limiter. Here is the photo of the IC. It's marked HC14 but I cannot find any datasheet for the IC.



Mark

[g1]

Try 74HC14

[Jazz P Bass]

Schmidt trigger.