8mm Forum: SANKYO help

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Posted by Brad Kimball (Member # 5) on January 19, 2004, 02:59 AM:

I have a SANKYO SOUND projector that when I attach the electrical cord and fire it up... all that happens is the little white fan thingy (in the back of the unit) spins for about a second... and then "kaput"....Nuthin. Can this be repaired?

Posted by Brad Kimball (Member # 5) on January 19, 2004, 12:04 PM:

It's a SANKYO 500 SOUND if this helps. The light in the machine comes on, but that's it I just can't get it do anything else.
It's a shame because i would hate to have to just throw it away.

Posted by Douglas Meltzer (Member # 28) on January 19, 2004, 12:41 PM:

Hi Brad,
Just a little more info....when was the last time the projector worked properly? Also, when the volume control is turned to max is there any audible hum?
Doug

Posted by Brad Kimball (Member # 5) on January 19, 2004, 02:53 PM:

Not sure when it worked last. It belonged to a neighbor who no longer wanted it and gave it to me before they moved away. Yes, there is an audible hum when the volume is turned up.

Posted by Maurizio Di Cintio (Member # 144) on January 19, 2004, 04:17 PM:

Hi Brad.
The problem could lie in one or more of the following:
a) a failure in the motor (it might just need cleaning rather than replacing)
b) an electronic problem in the motor control board
c) the rubber drive belt might need replacement.
All you can do in the first place is to open the back of the machine and see if the belt is still in its place.
If it is, try to remove it momentarily and turn the motor's pulley by the hand in order to assess if it moves freely or if the motor needs cleaning/lube. In this case it is possible to open it and work.
If the belt is broken you can replace it with an O-ring of adequate diameter (you may need a few trials, a piece of rope can be useful to determine circumference)

Lastly if all of the previous do not lead to any result, you may have to replace the control board or have it fixed by a techinician (it maight have a problem with some electronic component). It shouldn't be very difficult, though as it is basically a 2-channel (18+24 fps) DC motor speed regulator; any skilled techinician should be able to figure out how it works even with no circuit scheme.

Hope this helps.

Posted by Douglas Meltzer (Member # 28) on January 19, 2004, 04:44 PM:

Brad,
It could be a simple mechanical problem. When a projector isn't used for a long period of time, the grease/oil accumulation on the gears and shafts can render them immobile. Open up the back (unplugged for now) and take a look. If there is a manual advance knob try it and see how the drives work. If the grooves are clogged try WD-40 and use the manual advance to help work it through.
Doug

p.s.- of course while I was typing this reply, Maurizio posted and beat me to the punch! Well...redundancy isn't always a bad thing....

Posted by Maurizio Di Cintio (Member # 144) on January 20, 2004, 01:04 PM:

Hi Douglas!
Now that I've read your post, I think perhaps I was a little too pessimistic. I hope I was wrong.
Good luck, Brad

Posted by Brad Kimball (Member # 5) on January 21, 2004, 04:00 AM:

Thanks, Fellas. I'll keep you posted. BTW, where is the manual knob I can use to see if it advances? Not sure what I'm supposed to turn and i don't want to force anything.

Posted by Brad Kimball (Member # 5) on January 21, 2004, 10:13 AM:

Belt is ok. No cracks or splits.

Posted by Maurizio Di Cintio (Member # 144) on January 26, 2004, 06:43 AM:

Hi, Brad.
Only the higher end Sankyo(-s?) like the 800 Stereo feature the manual advance knob.
As for your machine, I suspect more and more a motor control board's electronical fauilure, but it's diffuclt to say without having a look at the machine.
Sorry

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