Relays in amp

hotscot · 15th January 2006, 01:25 AM

To cut a long story short I've determined that power is going into the pcb of my Marantz amp.
It also comes out again to serve the remotely controlled volume control.

Use to be when I switched on there would be a powering up thump. That doesn't happen. Could it be related to the relay?

There is a relay VB-24MBU-510

Does that mean anything to anyone?
Can a relay fail?

Thanks Alan

poobah · 15th January 2006, 01:31 AM

Do you hear the relay "click"... and did you ever?

Anything except death and taxes can fail...

Is your amp working?

Is this new thread that should an old thread?

hotscot · 15th January 2006, 01:35 AM

Well..when the case was on in normal use there was definitely a powering on thump which may have been in tandem with a click. I'm pretty sure there was a click but not %100.

I'm just wondering if the relay failed, (and can they?), would that stop the output to the speaker terminals and also the headphones and is there any way of testing it?

Regards
Alan

hotscot · 15th January 2006, 01:37 AM

Wasn't sure if I should put this in the old thread but now that I think of it I guess you'd like to keep things tidy. Point taken.

Amp isn't quite working. Replaced caps and rectifier. Power goes in, no blown fuses but no headphone or speaker signal out.

poobah · 15th January 2006, 01:46 AM

Well OK,

It's just hard to know what's is going on... that's all. You should FIND your old thread and post on it... then people can read the history.

Yeah relays fail... it could also the circuit that turns it on/off.

Do you have schem???

hotscot · 15th January 2006, 01:50 AM

I have the full schematic and will mail it if anyone feels like a look.

anatech · 15th January 2006, 02:07 AM

Hi Alan,
That tells me that the unit is in protection mode.

If you look on the board near the heatsinks you will see some 0.18 ohm dual resistors. They look like skinny white boxes with three legs. Measure the DC voltage at the centre leg. Don't leave the power on longer than you need to. The meter should read close to zero, less than 20 mV with that circuit I'd guess. Measure both channels.

I'll respond in the thread rather than via PM. I see you got poobah's attention already.

-Chris

poobah · 15th January 2006, 02:24 AM

anatech,

rescue...

poobah · 15th January 2006, 02:33 AM

Chris,

There is another guy here, who needs you... I can't find the thread. His bridge diode is blown, so far we've told him check other stuff and wait for anatech...

sorry

anatech · 15th January 2006, 02:34 AM

Hi poobah,
You were doing fine. I asked similar questions off line.

-Chris

15th January 2006, 01:25 AM	#1
hotscot diyAudio Member Join Date: Aug 2004 Location: California	Relays in amp To cut a long story short I've determined that power is going into the pcb of my Marantz amp. It also comes out again to serve the remotely controlled volume control. Use to be when I switched on there would be a powering up thump. That doesn't happen. Could it be related to the relay? There is a relay VB-24MBU-510 Does that mean anything to anyone? Can a relay fail? Thanks Alan

15th January 2006, 01:35 AM	#3
hotscot diyAudio Member Join Date: Aug 2004 Location: California	Not entirely sure Well..when the case was on in normal use there was definitely a powering on thump which may have been in tandem with a click. I'm pretty sure there was a click but not %100. I'm just wondering if the relay failed, (and can they?), would that stop the output to the speaker terminals and also the headphones and is there any way of testing it? Regards Alan

15th January 2006, 01:37 AM	#4
hotscot diyAudio Member Join Date: Aug 2004 Location: California	Sorry Wasn't sure if I should put this in the old thread but now that I think of it I guess you'd like to keep things tidy. Point taken. Amp isn't quite working. Replaced caps and rectifier. Power goes in, no blown fuses but no headphone or speaker signal out.

15th January 2006, 01:50 AM	#6
hotscot diyAudio Member Join Date: Aug 2004 Location: California	Schematic I have the full schematic and will mail it if anyone feels like a look.

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15th January 2006, 01:31 AM	#2
poobah diyAudio Member Join Date: Nov 2005	Do you hear the relay "click"... and did you ever? Anything except death and taxes can fail... Is your amp working? Is this new thread that should an old thread?

15th January 2006, 01:46 AM	#5
poobah diyAudio Member Join Date: Nov 2005	Well OK, It's just hard to know what's is going on... that's all. You should FIND your old thread and post on it... then people can read the history. Yeah relays fail... it could also the circuit that turns it on/off. Do you have schem???

15th January 2006, 02:07 AM	#7
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Alan, That tells me that the unit is in protection mode. If you look on the board near the heatsinks you will see some 0.18 ohm dual resistors. They look like skinny white boxes with three legs. Measure the DC voltage at the centre leg. Don't leave the power on longer than you need to. The meter should read close to zero, less than 20 mV with that circuit I'd guess. Measure both channels. I'll respond in the thread rather than via PM. I see you got poobah's attention already. -Chris

15th January 2006, 02:24 AM	#8
poobah diyAudio Member Join Date: Nov 2005	anatech, rescue...

15th January 2006, 02:33 AM	#9
poobah diyAudio Member Join Date: Nov 2005	Chris, There is another guy here, who needs you... I can't find the thread. His bridge diode is blown, so far we've told him check other stuff and wait for anatech... sorry

15th January 2006, 02:34 AM	#10
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi poobah, You were doing fine. I asked similar questions off line. -Chris

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