Solid State Amplifiers > The Newcomer's Forum
Amp problem
Uprightbassjunkie:
http://www.eserviceinfo.com/downloadsm/58490/Trace%20Elliot_GP12.html
This is the best one I found
phatt:
I'd be searching on the board for *IC 11 and 12* and see if you have voltage on pin 3 of both. If you have a stable Pos/Neg reading their then maybe check cables and other connections.
Surprising that most electrical problems I find are related to connections.
Phil.
Uprightbassjunkie:
I can't find ic11 or 12. I found ic1 - 9 though. The only bad coonections I found were the ones to the speaker out, but it doesn't explain why my preamp board is getting power. I tested the power connected to the pre amp board but it's not picking up any voltage.
J M Fahey:
IC11 /12 are in the Power Supply.
They are Voltage Regulators and *look* like 3 leg mid power plastic transistors.
Thet are labelled 7805 and 7905.
And the PCB silkscreen *should* call them IC11 and 12.
Now go find them and measure voltage on each one's leg 3.
Get their datasheets both to see their physical aspect and which one is leg 3.
Please be careful with *how* you write things, you seem to imply the opposite or a very different thing, it's confusing for us.
We may guess what you mean, and guess wrong.
Examples:
--- Quote ---but it doesn't explain why my preamp board is getting power.
--- End quote ---
I guess you mean: "is not getting power"
Or am I missing something?
--- Quote ---I tested the power connected to the pre amp board but it's not picking up any voltage.
--- End quote ---
"the power" ... what?
Power supply or power amp?
And, what does "picking up any voltage" mean?
You have a power supply there which supplies voltage ... or not.
The preamp will "pick up" voltage if it's present, will not if not.
So you must check that those voltages are available.
Good luck.
Uprightbassjunkie:
Sorry about being unclear, auto correct kills me. I'm testing them in a few.
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