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Does the blue power light come on when you switch it on? There is a 5amp fuse in the supply cable.Open the wall socket plug of the supply cable (unplugged of coarse) and check fuse and connections.With a multimeter check continuity of the three wires from the plug to the other end of the cable.If this is all good then you have an internal fault.There are fuses internally as well but this should be refered to a qualified technician.
The owners manual shows a AC fuse for the 8300 as 8amp / 250 volts but doesn't show an external fuse holder for the 8600d. It's unlikely that the 8300 would use a 8amp and your 8600 a 1.6 amp. Double check your original fuse values.
Assuming that you have checked the speaker leads for broken connections and that you know the speakers themselves work okay (test with a different amp) and that you can hear sound on the headphone socket
Check that you actually have the power amp switch in the right position for the outputs (monitor jacks or main neutrik/speakon sockets) that you are using (see page 25 of the manual)
That your speakers are connected to the speaker outlets on the rear panel and not the 'main outputs' on the front panel, which are for use with a separate power amplifier
Check the mute button is not in
You have turned both the master volume controls up.
Usual problem is the Channel A amplifier has burned and blown the switching transistors. Usually an internal board arc occurs and unless very skilled at board work of clearing the burned area and replacing the components you are better to replace the HCA2400 amplifier module... about $160
I would request you to carefully open the set after disconnectingg the power. Use a good multimeter in the continuity range to check the line of the main line to the set, the fuse and the mains switch/. Check for continuity to the transformer and to the seccondarry voltage that gives the dc. If there is dc coming aout check on all the different ranges, the one going to the mP IC , check for the conrol panel mP for any visible damage. Check on the X'Tal osc to confirm if the mP if faulty. Attempt only if your are familiar otherwise seek help. Hope this helps. Good day
Not to worry if you can take some pains and be confident. First of all arrange the turntable, the mixer, the amplifiers and the speakers. Connect the turntables two RCA pins to the PHONE pins L and R. of the mixer. Using another set of RCA cables to connect the output of the mixer to the amplifier's AUX inout L and R. Try to connect the red and white in accordance to the L&R. The speakers should be cconnected to the left and right of the amplifier's main. if you have front and rear use them but connect with the polarity of the red and black polarity . Use a good power supply multipin unit to connect all the power. Do not switch on until you have checked once again. Now switch on and play your favourite record. DO take time to do and you will suceed. Good day
REPLACE THE RCA CABLE COULD BE THE GROUND MAY HAVE GONE BAD....CHECK THAT THE AMP HAS A GOOD GROUND TO THE CAR WITH A METER MAKE SURE IF IT HAS A SWITCH FOR LOW IMP OR HIGH IMP IT IS IN THE RIGHT POSITION GOOD LUCK