Solid State Amplifiers > The Newcomer's Forum
Gallien Krueger ML250 output issue
pmarchione:
After googleing around I found the service manual... long story short it has a pic of the PCB and a part list. hopefully this is the bad part and i'll be set after replacing it. I'll update after I get it soldered in.
Roly:
This burned 100 ohm resistor is almost certainly only a symptom of deeper trouble, but if you are not bothering to actually read my posts I can't help you. :-X
pmarchione:
Sorry Roly, got excited when i saw the burned resistor. I did read the posts.
Here are the schematics.
As for the effects loop.... I jumpered it and the weak channel sounds the same, no distortion. it is not a stereo effects loop. the send /recieve jacks are the same part as the 1/4inch input jack. they are not trs.
(Side note I replaced the resistor to no avail)
J M Fahey:
1) Plug stereo headphones (which should mute the speakers) and play: do you hear the same on both earbuds?
2) make a cable with a stereo plug on one end, join the tip and ring contacts and apply signal (an MP3/CD/guitar through a distortion pedal used as a preamp) into J9 (external audio input?).
You should hear the same on both speakers.
Post results.
pmarchione:
OK JM,
the out to the headphones actually needed to be powered. i sent out to my pa good both sides. in from a cd player the same side is distored and weak. j9 is both the stereo input and the stereo output on this model.
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