8mm Forum: sankyo 700

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Topic: sankyo 700

Barry Webb
Film Handler

Posts: 79
From: Cornwall, England.UK
Registered: Jan 2010

posted February 13, 2013 01:53 PM

Hi all I have got hold of a very nice sankyo 700 projector the lamp and amp are working but there is no power to the motor in forward or backwards when switching I have tested the motor and that seems fine any help would be great.
Barry.

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Michael Wright
Expert Film Handler

Posts: 184
From: Chorley, Lancashire, England
Registered: Dec 2008

posted February 16, 2013 03:20 AM

Hi Barry, these are usually very reliable projectors, have you checked the fuses. Regeards MIKE

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Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted February 16, 2013 04:46 AM

The Sankyo main rotary knob controls micro switches, these often fail after years of use.

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Maurice

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Barry Webb
Film Handler

Posts: 79
From: Cornwall, England.UK
Registered: Jan 2010

posted February 20, 2013 02:50 PM

Thanks for all your help but I have tested the micro switches and there all fine, I have found a broken track on the main board and when I bridge it the board blows a fuse so I need a wiring diagram for it as I say the motor and transformer are fine but no power to the motor, lamp and amp work fine.
Barry

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Steve Klare
Film Guy

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

posted February 20, 2013 03:13 PM

The odds of finding a schematic aren't great, hopefully someone here has it and would share it. Personally I don’t, but I would share it if I did.

My wildest guess is there is some semiconductor (maybe motor speed control) device on that board that has shorted. The track that is blowing has become a fuse. What I would do is find that track and try to trace where it goes on the other side of the blast zone from the power supply connection. If you're lucky it goes to a few devices, if you are extremely lucky only one.

If you have several devices on that line, the thing is to try to unsolder the connections to that track one at a time and try to isolate the leg of the device from the board. When you find the right one, the short will clear. An ohmmeter is handy here: it's a lot less power and violence than the projector's power supply.

From that point its' a matter of identifying the dead part and finding a replacement. This many years down the road there’s no guarantee, but it’s worth trying.

The other possibility (which would be my first choice) is some sort of conductive debris has lodged in there and formed a short. With this violent a short there may be scorch marks around it.

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

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