Hi all,
I am having some trouble with my Onkyo M5060 r.
I use it in pair with its P3060 pre amp.
I am running a pair of JLB4311.
From time to time, the amp will turn red (from.the operational green) and will go in protection mode. I believe.
I am not sure on the cause.
One channel will go with a brum in it....
Can anyone help me out, hold my habd type of, and walk me through a diy attempt at repairing it?
I used to love changing a diode, transistor here and there in the past. So I am not that atehnical. But I will struggle for something this advanced.
Anyone that wants to embark on this newbie challenge please know...you will dictate the pace. I can't afford to have demands to finish it in 2 days type. You're the lead and I am the apprentice.
Thanks in advance.
I do have my soldering kit, my multimeter and the schematics.
I am having some trouble with my Onkyo M5060 r.
I use it in pair with its P3060 pre amp.
I am running a pair of JLB4311.
From time to time, the amp will turn red (from.the operational green) and will go in protection mode. I believe.
I am not sure on the cause.
One channel will go with a brum in it....
Can anyone help me out, hold my habd type of, and walk me through a diy attempt at repairing it?
I used to love changing a diode, transistor here and there in the past. So I am not that atehnical. But I will struggle for something this advanced.
Anyone that wants to embark on this newbie challenge please know...you will dictate the pace. I can't afford to have demands to finish it in 2 days type. You're the lead and I am the apprentice.
Thanks in advance.
I do have my soldering kit, my multimeter and the schematics.
Questions to chart the playground (I have revived one for a friend quite some years ago, some notes and photos still left):
a) is the problem completely random or can you repeat it (make it happen)?
b) are you sure the problem does not come from the preamp (you should drive the amp from one channel signal - if both channels brum then it is the preamp signal);
c) the bias adjustment trimpots I would replace;
d) the servo mode switch under the bottom can get very oxidized - you should clean it (at least work it back and forth some tens of times when flushing it with some contact cleaner).
e) the small lytics I would replace - as a precaution - some of them are in a hot area;
In my opinion it is not possible to pinpoint the exact cause with this sort of random problem - it may be a cumulative result of multiple problems.
Attachments
I don't think I can repeat it. Tried a couple of times and I can't get a repeat ..exactly.
I can try that. I had a feeling it might be the selector acting up.
I'll need to pin point where they are.
The servo mode...is that on it's underbelly? That S and D switch? Just found it now to my shame..
Not sure where those small lytics are. I'll need you to point them out.
I have checked the fusese, all ok. I am testing (if I remember correctly) the transistors on diode mode and getting 6.9 on two 7.9 on another pair, 0.3 on another and 22.3 on the last pair. From left to right channel
I can try that. I had a feeling it might be the selector acting up.
I'll need to pin point where they are.
The servo mode...is that on it's underbelly? That S and D switch? Just found it now to my shame..
Not sure where those small lytics are. I'll need you to point them out.
I have checked the fusese, all ok. I am testing (if I remember correctly) the transistors on diode mode and getting 6.9 on two 7.9 on another pair, 0.3 on another and 22.3 on the last pair. From left to right channel
Yes.
"Small lytics" are small sized electrolytic capacitors.
The bias adjustment trimpot (for one channel) is the blue round one on the upper right in the first photo. Their central axis contacts (connecting the wiper) tend to get pretty oxidized and may result in intermittent behaviour.
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