8mm Forum: Sankyo Stereo-800 Nasty Hum

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Topic: Sankyo Stereo-800 Nasty Hum

Jon Addams
Jedi Master Film Handler

Posts: 638
From: New York, NY, USA
Registered: Apr 2007

posted March 23, 2010 09:27 PM

Today I got ready to watch Viva Las Vegas only to find out my Sankyo 800 had a nasty hum, I mean really loud! I have no idea what is causing this, I used this projector on Sunday and everything was perfect.

Okay, now I have a brand new meter, any ideas where I may start looking for the source!

Thank you

Jon

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Steve Klare
Film Guy

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

posted March 23, 2010 10:03 PM

Hmmmm....(no pun intended....at least initially!)

Try looking for some seriously large electrolytic capacitors that are the filter network for the sound board power supply and measure the dc voltage across them. Find a spare capacitor of similar value, put it in series with the meter and take the AC voltage measurement at the same point (mind the capacitor polarity). This is a test to see if those capacitors are working, the AC measurement should be a tiny fraction of the DC measurement.

Do you have schematics?

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

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Jon Addams
Jedi Master Film Handler

Posts: 638
From: New York, NY, USA
Registered: Apr 2007

posted March 23, 2010 10:34 PM

I should have the schematics next week Steve, I just ordered the repair manual.

Thanks for the initial tips.

Jon

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Steve Klare
Film Guy

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

posted March 24, 2010 08:24 AM

Excellent!

Troubleshooting without a schematic is like driving a car with the windshield painted over.

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

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Rick Skowronek
Expert Film Handler

Posts: 120
From: Marietta Georgia USA
Registered: May 2005

posted March 25, 2010 12:08 PM

May also want to try, with power off, moving the record/play switch back and forth several times as well. This is not to say that it may still not be an electrolytic failure but (typically) they fail somewhat slowly. The fact that a few days earlier it was perfect says that you may just have a dirty switch which happens with these older machines especially when you don't use the switch much.

Just a suggestion.
Rick

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Steve Klare
Film Guy

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

posted March 25, 2010 12:12 PM

It's a good thought.

I had the sound fail on my PC recently and after I worked all the switches and jacks associated with audio it returned to normal.

-the things you learn messing around with Super-8!

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

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Rick Skowronek
Expert Film Handler

Posts: 120
From: Marietta Georgia USA
Registered: May 2005

posted March 29, 2010 05:48 PM

Jon,

Just wondered if you tried this or even had a chance to. Helps all of us to know what may or may not work with our projector issues.

Thanks,

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Jon Addams
Jedi Master Film Handler

Posts: 638
From: New York, NY, USA
Registered: Apr 2007

posted March 29, 2010 11:11 PM

Hello Rick,

I haven't try that yet because I am out-of-town until Wednesday but I will give it a go as soon as I get back.

And yes, IMHO, it's always important to post back with the solution when an issue has been resolved.

Thanks

Jon

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Jon Addams
Jedi Master Film Handler

Posts: 638
From: New York, NY, USA
Registered: Apr 2007

posted April 03, 2010 09:49 PM

I tried all the tricks you guys mentioned without luck. I will wait for the repair manual, bought it on eBay, but it hasn't shown up yet.

I will post back when and if I solve the problem.

Jon

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Rick Skowronek
Expert Film Handler

Posts: 120
From: Marietta Georgia USA
Registered: May 2005

posted April 05, 2010 11:00 AM

That's too bad Jon. Now the real fun begins.
Rick

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