Optronica amp one channel out.

As the channels are identical you can use the good channel has a guide to the bad one. First thing is to look around see if anything does not look the same as the right channel.

If nothing obvious stands out, with the power on, using an insulated screwdriver touch the two channels one at a time. Keep away from the power supply and anything that is common to both channels. The channel will buzz once touched. Depending which points you touch them. The right channel will tell you if it should buzz at that point. Work backwards from the speaker outputs if you can. If you hear a buzz on the left channel then it is working at that point, if it produces the same sound on the right.
Using this method you should track down the part that has gone.

Most likely a faulty cartridge. To check disconnect the leads to the cartridge. With the amp switched on touch each of the wires one at a time with your finger. On two you will have little or no response but on one you should hear a buzz on the left and on the other a buzz on the right. If the buzz are equal in volume then the cartridge is faulty. If the buzz is weak on the left, then that suggest a faulty pre-amp stage in the amp. This pre-amp only affects the record deck, so you won't get it on other functions.

Hi, I think in most amps switching to bridge mode simply means the amp supplies its total power through the left channel only. It's the best way to use all of your amp's power but nothing comes out of the right channel. Having speakers connected to both channels would simply mean that only the Left channel works, it would not blow it. Some amps have the speakers wired to binding posts and this varies according to whether you want mono, stereo or bridged. I can't help with the power board sorry

Hi Anita

Determine source of Buzz
Speaker --- Computers sound channel Amplifier
Left or Right channel
Can you hear buzz in earphones
Fan --- Speed changes with Temperature - insects or junk hitting on fan
CD --- Player mechanism - CD media left inside

Good Luck

Yes amps buzz when something gets near them - say a pen or probe and if you know what it is safe to touch a finger! Fortunatly for you the left channel is the same as the right. So if you believe it's the pre-amp work backwards from the where the power amp connects to the pre-amp, going through the pre-amp stage by stage - prodding the parts. Remember a buzz in the right a buzz in the left! No buzz in the left but one in the right fault found!
Ignore the power supply it's nothing to do with that as it's common to both channels.

If you are saying that it only works on say the left channel in stereo mode, but both channels come on in mono, then there's a fault in the amplifier's pre-amp. These days they are an IC, it can be traced by following the input wires to the point on the PC Board and then looking around for an IC with all inputs going in. If you are lucky there might be two! One for each channel. Replace the one on the dead channel. You can test it, either the single IC or both, touching it's pins with an insulated tool while the amp is on. It will buzz on the channel. Stereo amps have two sets of identical parts, except when an IC is involved. But even then that will have two halves (inside it). You just need to touch the pins of the IC, with the tool, but don't short the pins together! You should hear at least 4 buzzers. One at the right input, one at the left input, one each at the left and right output. If you only get the left an right output buzz, plus the good channel input buzz, you know it's the IC that's gone.

The "Front output" from the Pioneer deck would connect to the "Main In" on the Clarion EQ. I'm assuming that your Clarion EQ can only deal with one input, and will send the adjusted (equalized) signal out both of the outputs.
The "Front output" from the Clarion EQ should go to the "Front Input" on the 4 channel amp.
The "Rear output" from the Clarion EQ should go to the "Rear Input" on the 4 channel amp.
The "Sub output" from the Pioneer deck would connect to the Left/Right Input on the Epicenter. The Left/Right Output on the Epicenter would need a Y-splitter for each side, so that you could connect each amp separately. One suggestion would be to use one sub amp for both subs.

you need to run the left speaker output from the amp to the left speaker input on the Bose, the right speaker output on the amp to the right speaker input on the Bose, the center channel output on the amp(assuming it has one), to the center channel input on the Bose...then the right output on the Bose , to the right Speaker..the Left output on the Bose to the left speaker...and finally the center channel output on the Bose to the center speaker

Switch input co-axel wires. If you still get the same result, you blew that channel on your amp. Repairable

Follow the left channel lead to where it joins with the PCB. Use a pointed tool and prod connections if you get a buzz then that stage in the amp is working. I suspect you will find it leads to a IC that might cause the fault. If you find it buzzers on the right but not left, then it's gone. PS don't short pins. If you can get hold of a signal injector it will make things easy.
Be careful and good luck.