Question about Pioneer GM-6300F Car Audio Amplifier

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Pioneer 6300 F

I hooked up a sony sub and 2 6x9's to a Pioneer 6300F amp, it ran fine for a short while then stopped and the fuses burnt out. I realised the grounding cable was not connecting correctly. I replaced this and the fuses and the amp now turns on and stays on, however the speakers and sub do not have any sound. The 6x9s have a slight pulse coming through every few seconds, but that it.

Any ideas?

Ive checked all cables and wiring and it is all ok.

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Still having problems? Let's try ruling out the RCA connections as a problem:

The amplifier (Pioneer 6300F) to head unit RCA connection may have been damaged as a result of the bad grounding of the amplifier. ie; If the amplifier cannot obtain a ground connection for its voltage rail through chassis grounding or negative votage connection point, the RCA negative signal path (outer connetion shield on RCA point) will become the only grounding point.

Normally the head unit has an internal fuse (about the size of a grain of rice) which blows at this point, requiring an internal repair. You can "temporarily" repair this by connecting a wire from the outer RCA (neg) connection to the head unit chassis, however if the same grounding problem occurs at a later stage, the connecting wire will become a "fire wire"!!!!... So it's not recommended to do this for anything other than fault finding.

In some instances the RCA cable itself will be damaged, resulting in the positive, or negative wire becoming an "open" circuit. If the inner wire (pos) becomes broken (open circuit) you will have no signal presented to the amplifier (no sound) . If you have an outer RCA wire (neg) broken, not only will you have "no sound" but you will also have an annoying "pop" which will occur every couple of seconds due to the negative preamp signal (inside your amplifier) eventually finding a ground internally. This can pop circuit breakers and fuses, as it is a rapid full blast of signal voltage being induced into the amplifiers preamp audio circuit.

Lastly, if your amplifier RCA input connection has a weak or broken (dry) solder joint internal of the amplifier it will present the same symptoms as an unserviceable RCA lead.

If you want to see if this is the problem, you can do a couple of tests which will tell you whether you have this symptom occurring:

1: connect the head unit to the amplifier using the "speaker inputs". (use the speaker outs on the h.u. for this, and disconnect the RCAs). If the system now works correctly, then continue fault finding the RCA circuit. If the same problem still occurs then the RCA connection is NOT the problem, and your amplifier has a problem with its preamp circuit.

2: If step 1 "passed", replace the RCA connection (and remove the h.u. speaker signal inputs to the amp) with a different RCA lead. If the problem is not apparrent then you've fixed it!! If the problem is still occuring then continue onto step 3

3. temporarily connect a thin wire from the metal chassis of the h.u. to the outer of the h.u. (head unit) rca connector. A simple wrapping of wire around the metal outer connection to the chassis should suffice for testing. (be ready to turn the system off if the temporary wire becomes slightly hot). Test the system and see if the problem has gone away.... If the problem has been resolved, then you will have to replace the h.u. internal RCA ground fuse (which requires soldering). If the problem is still there then continue to step 4

4 temporarily connect a thin wire from the RCA outer connection on the amplifier to the amplifier chassis and see if this fixes the problem. If the problem is now resolved, the amplifier needs to be replaced, or the preamp circuit needs repair. It could be as simple as resoldering the RCA connection inside the amp, or as complex as replacing a transistor... One thing to consider is that this fault finding technique cannot be used on "balanced line" RCA inputs... The 6300F uses "unbalanced" inputs so you should be o.k.

5... If you have done all of the above, then the problem isn't the RCA connection, so at least you have ruled that one out....

Posted on Oct 30, 2008

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Firstly, you might want to check if the resistance of your speakers (out-of-circuit) are in specs using an ohmmeter. If it's rated 4-ohms then it should be reading near 4-ohms resistance otherwise it is damaged.
secondly, if the amps can be powered 'on' make sure that it has no dc voltage in the outputs. If there is a signal source an AC voltage will dance the meter pointer which indicates that your amp is OK. Only then can you reconnect your speakers (not the damaged speakers duh!).

Posted on Oct 17, 2008


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