Schematics for kustom Lead Amp top? - Jemsite
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post #1 of 3 (permalink) Old 09-03-2017, 11:31 AM Thread Starter
 
Join Date: Feb 2007
Location: Sweden
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Schematics for kustom Lead Amp top?

Looking for Schematics for a Kustom Lead III guitar Amplifier top

The out signal to the Speaker doesn't work.
Line seems ok.

The repair shop cant find any schematics from the maker, and they cant do anything more until they have schematics.
Voltage varies from 0.5 to 20 V without explanation.

Have looked on the net but found no Kustom schematics specifically for the III Lead top.

Anyone got them as PDF or knows where to find them?
Metallion is offline  
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post #2 of 3 (permalink) Old 09-04-2017, 08:25 PM
 
Join Date: Jan 2005
Location: Canberra, Australia
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Re: Schematics for kustom Lead Amp top?

Quote:
Originally Posted by Metallion View Post
Looking for Schematics for a Kustom Lead III guitar Amplifier top

The out signal to the Speaker doesn't work.
Line seems ok.

The repair shop cant find any schematics from the maker, and they cant do anything more until they have schematics.
Voltage varies from 0.5 to 20 V without explanation.

Have looked on the net but found no Kustom schematics specifically for the III Lead top.

Anyone got them as PDF or knows where to find them?
Have you gone to the Kustom website and used their contact details to ask for a copy of the schematics? That seems like the logical point of call.

https://www.kustom.com/contact-us
LonePhantom is offline  
post #3 of 3 (permalink) Old 09-23-2017, 04:09 PM Thread Starter
 
Join Date: Feb 2007
Location: Sweden
Posts: 172
Reviews: 1
Re: Schematics for kustom Lead Amp top?

Looks like I got the right plans, for some "pc506..." board.

Now it's about + 0.7 V DC out, for the speaker out port.
He says it's ok, But it varies, and he can't figure out why.

When he cools the two "Differential steps", (called Q1 and Q2: "2122" or 4249?) one gets to plus + 2-3V, the other to minus - 2-3V.
It's some kind of balancing coupling.
The repairman cant figure out if it should be a difference on the two steps like that.
, if he should keep looking for a fault or stop there, since what should happen in the amp, with it's values etc, is not clear.
If someone knew?

He gets a 25V + DC at times
It's a -71-78 make amplifier module
Metallion is offline  
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