8mm Forum: Sankyo 702 humming noise

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Topic: Sankyo 702 humming noise

Lee Panton
Film Handler

Posts: 75
From: UK
Registered: Sep 2014

posted September 17, 2014 11:21 AM

When i plug the lead from the projector into the wall socket and switch on without starting to run the machine i hear a humming noise but is this normal for the 702 or does it mean the amplifier or power supply is on its way out. Apparently this machine only had about 10 hours use over a few years but could have been sitting in a box for many years. Only got this machine a few days ago and the seller claims its fine. The machine is running fine otherwise.

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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted September 17, 2014 12:31 PM

How bad is the hum? All old audio circuits will have some of it, it's just a question of how tolerable it is.

It could be that the electrolytic capacitors in various filter circuits are dried out and aren't very capacitive anymore.

They dry out with age alone, and go even faster without a voltage being present to keep them formed up. This many years down the road none of them should be working by any usual standard (yet they do...).

They aren't that hard to replace if you are up to it.

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All I ask is a wide screen and a projector to light her by...

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Lee Panton
Film Handler

Posts: 75
From: UK
Registered: Sep 2014

posted September 17, 2014 01:23 PM

Thanks Steve. The hum is not loud or distracting just slight noise…seems to be performing fine though. Just purchased this machine a few days ago…according to the seller it only had about ten hours use over a few years but it could have been sitting unused for many years.

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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted September 17, 2014 02:36 PM

Sure,

As long as your soundtracks drown out the hum it's not a problem. When you start to hear it during quiet scenes, then you have an issue to work on.

I actually like just the slightest trace of hum: it lets me know that the sound is all connected up and turned on.

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All I ask is a wide screen and a projector to light her by...

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