I purchased this amp and it came damaged. I belive that there was water damage to the pwer board. It is a seperate pleice but I belive I need a new one. I have been unable to find anything about this company. Any help would be great
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Re: solid audio f29 2 channel
With the no name amps theres not alot you can do. Even with the high end amp companies you cant get much info and parts out of them..
If you happen to be in the chicago area i do run a small repair shop and i would be happy to take a look at it and see if theres any way to repair it....
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If the fuse blew, you ARE going to need a lot more than a fuse as the cause is usually internal damage to the amp module and or power supply. Replacing the fuse without repairing the cause USUALLY causes more damage.
What is the source of the HCA2400 module? Be very careful if you disconnect the power supply 70 volt cables to discharge the caps before connecting new amp module otherwise you will do some welding with the arc that occurs. You could run the unit with the 70 volt cables pulled at the power supply... leave the other little cables in place. Also be sure to read my tip on Fixya regarding the Channel A hazard with speaker cables. I received an HCA2400 replacement that was wrapped in pink bubble so tight that 5 small electrolytic caps near the audio input cables were broken loose destroying the circuit board. Be sure and check your replacement in this area for damage due to improper shipment. I have repaired some of the HCA2400 that burned up channel A... it is a lot of work to grind out the damaged board and re-insulate and restore circuits with jumpers.
You CANNOT power 4 total 4 ohm speakers from this unit without special configuration. The lowest you can go is 4 ohms per side, which would be one 4 ohm cabinet per side. You would have to do a series parallel arrangement with the resources you have... two Peavey's in series and that combination in parallel with two 15's in series...
This is a VERY unsafe configuration with this mixer. ALSO please read my tip on here in regard to PMP mixer grounding hazard of the A channel when using Speakon to 1/4 inch cables.
Frankly, forget about maximum performance unless you want to risk blowing your mixer...
If I were you, I would put the two 15's in SERIES as 8 ohms on one of the channels and the Peavey's in SERIES as 8 ohms on the other channel.
You would be well to heed this warning as I have repaired a bunch of these units. Be careful of any poor speaker connections as there is an insulation breakdown problem in the power amp circuit board if a speaker becomes intermittent. If something fails DO NOT replace the pwer fuse as you will do more damage.
I suspect one of the upfront IC amps has been damaged. This can happen if people power the mixer from a receptacle that is different from where other connected equipment is powered such as amp. For example, mixer is at one end of the hall and other inouts such as an output of a guitar amp is plugged in. If a ground fault or spike occurs, teh ground bounce can exceed the common mode voltage of the input amps.
In your case, the inpout amps are discrete transistor types.
A voltage surge into the inputs of your unit would LIKELY pop two bypass caps that are 330pf. For channel 2 these are C205 and C206. Check those for shorts.
VERIFY audio is available at the "send" (tip) of the channel insert connector... this verifies the preamp stage. You can PROBABLY plug a set of headphones in to check this... ONLY one side will have sound of course. Verify this is a good test by checking a working channel. The level will be quite low and we are looking for just some signal.
IF you do have signal on the channel insert send which is the "tip" of the channel insert with the trim turned up, let me know and I will check the schematic for the next thing to check farther down the line.
These are very complex amps that mainly use surface mount components. This amp has 4 vertical boards for the individual channels. It's difficult to work between boards and it's easy to damage the main board if you don't have good quality equipment to desolder them. If you want to learn to repair audio equipment, this is not a good starter amp. I'd suggest sending it to JL or a reputable local shop.
If you're lucky, it could simply be a case of a dirty contact on a switch or a switch that's not set correctly. Try moving all of the controls and switches before sending it off for service.