8mm Forum: One last thing about the Sankyo 800. (I promise!)

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Topic: One last thing about the Sankyo 800. (I promise!)

Jan Bister
Darth 8mm

Posts: 2629
From: Ohio, USA
Registered: Jan 2005

posted July 03, 2006 06:33 PM

Wow, Rick, thanks. [Smile]

I was all set to get a rectifier through eBay which would have cost me $7 or so, good thing I didn't do this yet. [Smile]

All in all I have been quite successful... Unit B is now completely functional, and Unit A will be as well once it has a new rectifier, which leaves only the dead left channel to worry about. That reminds me - which IC is it that is responsible for playback and recording on that channel? (where is it physically located?)

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Call me Phoenix. *dusts off the ashes*

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Jan Bister
Darth 8mm

Posts: 2629
From: Ohio, USA
Registered: Jan 2005

posted July 22, 2006 10:15 PM

Strange...

Put in the new rectifier, plugged 'er in, POP... capacitor was shorted (should've tested it first). Replaced capacitor, verified that the rectifier survived unscathed, and plugged 'er in again. No POP this time, and the multimeter indicates voltage is present on the DC side. All is connected properly and I know the motor is good, too.

Still, it won't come on when I put the machine in forward or reverse.

Strange...

I've half a mind to just power the motor externally, with a projector-independent DC supply. [Roll Eyes]

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Call me Phoenix. *dusts off the ashes*

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted July 23, 2006 05:17 AM

By doing that Jan you will have no speed control.

Can you not swap the motor control boards between machines to see if the fault moves between machines? this is asuming the machines have a seperate control board.

This is a problem that has to be watched on machines of this era, capacitors especially electrolytics will be tiring and when they have voltage applied to them after a long time of no use this is the sort of problem to expect.

Kev.

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GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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Jan Bister
Darth 8mm

Posts: 2629
From: Ohio, USA
Registered: Jan 2005

posted July 23, 2006 08:37 AM

I did swap the boards between machines, that's how I got Unit B to run. Unit B was originally the one with the "dead" motor, so now it's a 100% working unit including recording on both channels.
Since Unit A (the current problem machine) was also running fine before the swap, it stands to reason there is yet another issue with the control board itself. There are some more electrolytic capacitors so I'll pay special attention to those. [Smile]

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Call me Phoenix. *dusts off the ashes*

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