posted April 29, 2008 10:35 PM
Hello everyone, i'm Larry from Southern Ontario, Canada.
I have a Canon 8mm camera which I have never actually used, but have played with as a kid. I want to get film and do a test shot to see if the camera still functions and shoots properly - I may help a friend shoot a music video later in the summer. I also have my dad's film editor/viewer.
This weekend I dug out my parents projector (Sankyo Dualux 1000) and replaced the drive belt which broke eon ago...at first it ran like magic, but now it runs slow when I play my films. It works fine with reverse and can rewind properly...but the maximum forward speed has slowly decresed as i've been watching videos...Maybe with a 20-30 min runtime since i got it up and running again. I cleaned the brushes and stator but I dont think its the motor. What do I need to replace, or modify in order to make it run at regular speed? I'm thinking its something with the rheostat motor control - or some resistance values need to be changed somewhere. Just a hypothesis, but I have no idea how to proceed.
It would be nice to have normal speed with the motor speed knob in the center - as to allow adjustment for both up and down. Right now its cranked all the way up and not hitting the proper speed.
posted April 30, 2008 01:41 AM
Larry, welcome to the forum. Kudos on cleaning the inner parts of the motor but did you give the rest of the machine a good look? Try to clean all cogs and gears (there might be solidified grease clogged somewhere) - then lubricate all moving parts (silicone on plastic, lithium on metal). See what it does... Best of luck.
From: Melbourne, Victoria, Australia
Registered: Feb 2006
posted April 30, 2008 08:30 AM
Larry, I had one of those years ago with the same problem. From memory there is a sprung drive pulley in the back somewhere that would not hold its correct tension and hence the speed slow-down.
As Jean-Marc says, give all the gears and cogs a good inspection and clean. Sorry I am a little vague on the problem, but it was years ago that I bought the projector in a pile of stuff, then repaired the fault and re-sold it.
posted May 02, 2008 03:14 PM
Thank you for the replies.
Where abouts would I start taking this apart? I am fairly competant with taking things apart, but i'm stumped about what component to remove first...
Also is there general maintenence that should be performed on my camera? What film/retailers are recommended for super 8 film purchase and development? My camera is a Canon "Auto Zoom 814 electronic". Any advice on this camera?
After checking the voltages across the armature, I found that there was a significant load difference between forward and backwards. No belt slippage was occurring.
The issue: the main drive shaft has the belt pulley on one end and the worm drive on the other. At two locations there are bushings (?) that hold the shaft, as well as one portion of the shaft that acts as a cam. The cam has a small packet of oil with a wick and small piece of sponge. After applying a drop of 3-in-1 oil to the cam, bushings and worm gear, she's running like new! Our speeds are way better - although reverse is still faster then forward. At any rate, dialing the speed control to under half-power results in proper viewing speed. I got my cake and ate it too