crackle that moves my speaker cone like crazy on cold start Yamaha CR1020

Darren James

Darren James

Active Member
Hello, Regardless of volume level, when I start this machine (only happened 3 times over a week), it sends large crackles which move the poor woofer almost out of its cabinet. I thought I got rid of it by de-oxing the volume knob...... It has forced me to start the receiver in speaker off mode and wait for a couple minutes.....

Dirty knob still or bigger issue???

Thanks in advance,
Darren
 
Is this happening immediately after power on or after the protection circuit mute period.
The amp has a protection circuit that will delay connecting the speakers for a period
of 4-8 seconds after power on, to allow transients to settle.

Possible failure in the protection circuit or relay contact "welded" permanently connected.
 
mbz said:
Is this happening immediately after power on or after the protection circuit mute period.
The amp has a protection circuit that will delay connecting the speakers for a period
of 4-8 seconds after power on, to allow transients to settle.

Possible failure in the protection circuit or relay contact "welded" permanently connected.
Click to expand...

Immediately upon power up... I hear the relays kick in about 5 seconds after... when it happens I shut it off, turn speaker switch to off, then turn on again and wait a minute..
 
panel lights ... not important right now . i suspect there is a fault with the relay drive circuit or the relay itself if it does indeed show that fault right away at power on .
 
You should not hear anything until after the relay "clicks". The relay connects the speakers to the outputs of each of the amplifiers.
 
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transistor and capacitor cheapest first thing to swap .. further diagnosis might be intermittent. apart from maybe relay driver base voltage time to come up .
 
petehall347 said:
out of how many times ?
Click to expand...


I thought I cured it with de-oxit... it was quiet for a week or two.... its back..... well, I am starting with speakers off now... before?, at least 50/50 ... more than not, which is why I stopped starting with speakers engaged... not interested in cooking a pair of HPM100's....
 
Darren James said:
well, I am starting with speakers off now...
Click to expand...
Darren James said:
not interested in cooking a pair of HPM100's....
Click to expand...
Food for thought. The relay sounds like welded contacts or physically by-passed. If this is indeed the case.You risk burning up your speakers big time in the event that and output transistor goes south. Because you don't have a functional protect circuit.
 
avionic said:
Food for thought. The relay sounds like welded contacts or physically by-passed. If this is indeed the case.You risk burning up your speakers big time in the event that and output transistor goes south. Because you don't have a functional protect circuit.
Click to expand...
I personally would not hook up anything that I valued to this unit until you get this issue squared away.
 
Is the crackle on both channels? might be a power supply issue.

Should be able to get to the bottom of this with a multimeter, no need to fry spkrs...

Might have to do a pre-emptive refurb of power supply and protection circuit.
 
mbz said:
Is the crackle on both channels? might be a power supply issue.

Should be able to get to the bottom of this with a multimeter, no need to fry spkrs...

Might have to do a pre-emptive refurb of power supply and protection circuit.
Click to expand...
The popping and crackling is heard before the relay " click"..
Darren James said:
Immediately upon power up... I hear the relays kick in about 5 seconds after... when it happens I shut it off, turn speaker switch to off, then turn on again and wait a minute..
Click to expand...
 
avionic said:
The popping and crackling is heard before the relay " click"..
Click to expand...

Probably had a protection circuit issue so some goober decided to bypass the relay contacts. It would explain why he's getting exciting speaker movement and a relay click.
 
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