Question about Marshall Amplification Marshall MA100H and MA412 Half Stack
Every time i turn it on it blows a fuse idk what to dod
Posted by Anonymous on
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Posted on Jan 02, 2017
I would first check the filter electrolytic caps for shorts...
This is the WAY you work on this problem. Replace the fuse and put a 60 or 100 Watt incandescent lamp in series with the HOT power wire. This acts as a current limiter/automatic resetting fuse and you can search out where the current is going. Old trick we have used for more than 50 years. Also using a Variac to control the voltage can be useful, but the lamp should get you through the problem...
Posted on Feb 10, 2011
SOURCE: I have the old 3520
Here is a link to your schematic:
Scroll way down and click on "Get Manual" link. They will only let you download two a day unless you are registered.
Suggestion is to troubleshoot and repair the unit.
You will likely find one of the following:
Shorted transistors in output TR5 through TR10
Shorted rectifier diode(s)
Shorted fillter capacitor
Shorted power transformer (not very likely)
Posted on Mar 21, 2011
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