Acoustic 150 Low Volume

[J M Fahey]

1) Ok, before you edited it your post looked like cut/paste from "somewhere else", from "other user" and baffled Techs often come here after trying somewhere else, so ...

2) I see your amp does not have effects loop ..... which is THE most common cause for sudden volume loss, your complaint, that´s why it was suggested.

OK, then you will have to measure some voltages which will lead you to the problematic area and there you will have the bad component.
That is called "troubleshooting" and Acoustic gives you an *excellent* description and step by step guideline.
General troubleshooting from pages 2 to 9.

3) first check DC voltages as suggested there.

Post any wild one (within 20% it´s fine) so we guess what´s causing that.

4) IF DC voltages are fine but signal gets lost, it might be not a bad part but a connection problem.
Anything from a bad wire to bad/cracked solder to broken track to dirty/poor/rusty connection.
Then you must inject signal at the input and follow it until it´s lost.
Manual shows expected normal values.

Post results and we´ll interpret them.

[guitman]

That's quite a relief. I was going to suggest a trip to Walgeen's might be in order.

Reminds me of a local band here: The Four King Dwarves (seriously, it's true).

Four King Dwarves and Burnin Loins, sounds like a good lineup!

[guitman]

Fahey, thanks for the tips. I will try to get to testing the voltages this weekend and report back with the results.

[J M Fahey]

Oh, those are Acoustic´s official tips.
very well written, by the way.

In general *service manuals* are quite good, problem is that we hardly ever see them; usual data available online is just the raw schematics ... and often without voltaqges or even worse ... partly or mostly unreadable

Japanese service manuals are always excellent, not only with straight servicing but very detailed assembly/disassembly down to the tiniest parts and exploded views; as Enzo often says, WELL worth buying if available.

I mean buying the real thing from parent company, not paying 10 bucks to "schematics unlimited" or "music parts" for a poorly scanned unreadable schematic photocopy of a photocopy ..... although sometimes that's all's available.

[Jazz P Bass]

I feel like an idiot, but I do not see anywhere to attach items. All i see is add link, email, insert image, and insert video. Insert image simply asks me for a URL. I see no button to attach images to the thread. What am I missing?

I simply click on "insert image" to upload info.