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RE: Troubleshooting from a schematic
To: "'CRTech'" <crtech@crtech.org>
Subject: RE: Troubleshooting from a schematic
From: "Wiely Boswell" <wiely@faithradio.org>
Date: Thu, 4 Jan 2018 09:56:58 -0600
In-reply-to: <62CE64C1-DAF3-4FC6-987E-AA48F6388FAC@am91.org>
Thread-index: AdOD09F/biTyLVIJSFiv8NX67Z8UkgBoJgBQ
Is it a class D amp ?  They would seem to be able to do such a thing but I
have no experience troubleshooting them.
Interesting topic,

-----Original Message-----
From: Dan Harder [mailto:dan@am91.org] 
Sent: Tuesday, January 02, 2018 8:13 AM
To: CRTech
Subject: [CRTech] Troubleshooting from a schematic

Hey all,

My son inherited an old Crate brand instrument amp from his uncle last
summer. It worked well for about 3 months, and now is a white noise
generator and only the smallest amount of audio from any of the 3 inputs
leaks thru.

I have schematics, but the PC board is not marked at all, and I've spent
several hours trying to determine the cause. I have access to a fluke

The noise is constant and does not vary with any knob adjustment.

Would anyone here mind a look at the drawings and venture a guess as to what
component(s) might be guilty?

Private message me if you're interested.

Dan Harder

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Follow-Ups: Re: Troubleshooting from a schematic
(John Stortz <ka4flx@gmail.com>, 8 Jan 2018 04:45:56 -0000)
References: Troubleshooting from a schematic
(Dan Harder <dan@am91.org>, 2 Jan 2018 14:13:01 -0000)
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