8mm Forum: Sankyo 500 Lamp yes, motor no

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Topic: Sankyo 500 Lamp yes, motor no

George Tveden
Film Handler

Posts: 9
From: Spokane, WA 99027
Registered: Nov 2012

posted December 22, 2015 02:54 PM

Greetings! I have a Sankyo 500 that lamps up but no forward or reverse. The motor checked fine. This led me to the innards. The bakelite back plate on the control switch was broke out and one of the switch blades had slipped out. Re-inserted and Super-glued it back together. However, when inspecting the power board I found a bridge rectifier that looks cooked. It says Toshiba 481 on top and has a 1B 8B om the side. Can anyone ID this and tell me where I may find a suitable replacement? I'm not an electronics wizard. Thanks so much! Happy Holidays!

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Geo. Tveden

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Janice Glesser
Film Goddess

Posts: 3468
From: Sunnyvale, CA USA
Registered: Sep 2011

posted December 22, 2015 03:43 PM

Hi George...you are in luck [Smile]

I have had to replace that same bridge rectifier on my Sankyo 800. It took me a lot of searching but the equivalent part is an NTE5304 - 400V, 1.5A. I found it at my local Fry's Electronics store...but you probably can get it online.

You should check that large capacitor also.

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Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

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Steve Klare
Film Guy

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

posted December 22, 2015 03:57 PM

Nice Work, Janice!

That's the joy of these forums: there's nothing new under the sun and there's a decent chance the problem you just had somebody else had last year or even last week.

(Note: It's really "NTE5304". What's a little dyslexia among friends? [Smile]

)

I'm I agreement on the capacitors and maybe other stuff in there. A small part like this shouldn't run hot and often fries when something else it is powering has gone short circuit. Look on the printed circuit board for discolored lands and other heat damage.

Here's an equivalent you can find at Radio Shack:

1.5A, 400V at Radio Shack

-assuming you can still find a Radio Shack in the first place!

Amazon has them too, Newark Yes, Digikey maybe not...

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

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Janice Glesser
Film Goddess

Posts: 3468
From: Sunnyvale, CA USA
Registered: Sep 2011

posted December 22, 2015 04:26 PM

You called it Steve...Actually I am dyslexic [Smile]

I corrected it .

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Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

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George Tveden
Film Handler

Posts: 9
From: Spokane, WA 99027
Registered: Nov 2012

posted December 22, 2015 04:36 PM

You guys rock!!!! Thanks Janice, and Steve. I too am dyslexic. Reading dyslexia for me. Oh well... we get by... eventually. I'll let you know when it's fixed. Thanks again, and take care.

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Geo. Tveden

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