8mm Forum: Sankyo 800 stereo machine needs a jump start...

This is topic Sankyo 800 stereo machine needs a jump start... in forum 8mm Forum at 8mm Forum.

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Posted by John Capazzo (Member # 157) on March 05, 2019, 05:24 PM:

I have a Sankyo 800 that won't get moving. The lamp works when it's in lamp mode; but nothing is moving. The fuse is a good 6A 250 (I'd think that would be too much amperage but left it in) and all the harness plugs are in tightly. The speaker works and probably sound head and amp as you can hear hissing (and it increases as it should)as you would with a perfectly running projector I can't find any leaking capacitors nor broken solder joints; but then again, I didn't remove any circuit boards to scrutinize.Any thoughts? Thanks.

Posted by Leon Norris (Member # 3151) on March 05, 2019, 05:41 PM:

John, check the motor? I have replaced them before! Also I have a service manual for this projector! In nice condition! Good Luck!

Posted by Janice Glesser (Member # 2758) on March 05, 2019, 06:04 PM:

Hi John...I don't know if you remember a few years back I bought a Sankyo Stereo 800 and did extensive troubleshooting and repairs. I even bought a transformer from you which I never needed to install because the transformer was not the problem.

Open the back of the projector and check the bridge rectifier shown in the pic below. This is a major culprit along with the large 1000uf cap next to it. Replacing these two components got my machine up and running again.

If you want to re-visit the thread here's the link:

http://8mmforum.film-tech.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=008244

Posted by John Capazzo (Member # 157) on March 05, 2019, 06:17 PM:

Hey Janice. I do remember sending you a transformer. I also located the rectifier and the capacitor next to it. The rectifier on mine is more of an angle. How would I know if it's bad? and the other isn't leaking. How do I know if both are bad? Thanks.

Posted by Nantawat Kittiwarakul (Member # 6050) on March 05, 2019, 07:12 PM:

Make sure that the motor did get DC voltage to it. A multimeter would be very useful in this case. [Wink]

Posted by John Capazzo (Member # 157) on March 05, 2019, 08:55 PM:

The rectifier is not cracked. Mine is square and it's solid. I removed that board and inspected everything. I noticed a small crack in the lower corner of the board but no joint was close enough to get damaged.I tried uploading a pic but it was too big and my desktop doesn't crop pics. Only has paint. I'll check the motor if it has DC power.

Posted by Janice Glesser (Member # 2758) on March 06, 2019, 09:14 AM:

John you can not test the rectifier in circuit. Mine didn't look cracked either, but that doesn't mean it's good. Actually I couldn't see the crack until I removed t. Unsolder the bridge rectifier and the 1000uf cap and test with multimeter.

http://8mmforum.film-tech.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=008 244;p=7#000151

BTW...You can crop and resize photos in MS Paint. Check out this video:

https://youtu.be/xtlG-FIUaFY

When you save the file to .jpg you will have the option to reduce the file size by percentage. Depending on the size of the picture try about 70 % and go from there to bring the file size to under 200kbs.

[ March 06, 2019, 04:13 PM: Message edited by: Janice Glesser ]

Posted by Lee Mannering (Member # 728) on March 07, 2019, 03:30 AM:

Hi John. Just test those switches behind the bottom front cover I've had to change a few of these out over the years. Easy fix if its that.

Posted by Leon Norris (Member # 3151) on March 07, 2019, 09:26 AM:

I fixed one with this problem and it was the motor! It takes the same motor as the GS1200. Check those motor brushes! These motors are getting old! Sooner or later its going to go!

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