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Old 15th January 2006, 01:25 AM   #1
hotscot is offline hotscot  Scotland
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Default 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
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Old 15th January 2006, 01:31 AM   #2
poobah is offline poobah  United States
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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?
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Old 15th January 2006, 01:35 AM   #3
hotscot is offline hotscot  Scotland
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Default 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
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Old 15th January 2006, 01:37 AM   #4
hotscot is offline hotscot  Scotland
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Default 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.
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Old 15th January 2006, 01:46 AM   #5
poobah is offline poobah  United States
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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???
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Old 15th January 2006, 01:50 AM   #6
hotscot is offline hotscot  Scotland
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Default Schematic

I have the full schematic and will mail it if anyone feels like a look.
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Old 15th January 2006, 02:07 AM   #7
anatech is offline anatech  Canada
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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
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Old 15th January 2006, 02:24 AM   #8
poobah is offline poobah  United States
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anatech,

rescue...
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Old 15th January 2006, 02:33 AM   #9
poobah is offline poobah  United States
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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
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Old 15th January 2006, 02:34 AM   #10
anatech is offline anatech  Canada
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Hi poobah,
You were doing fine. I asked similar questions off line.

-Chris
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