8mm Forum: Bolex M8 Repair Question

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Topic: Bolex M8 Repair Question

Peter O'Grady
Junior
Posts: 3
From: Dublin, Ireland
Registered: Jun 2012

posted June 17, 2012 12:11 PM

Hi All,

This is my first post here. I'm new to the 8mm world. I recently got my hands on a Bolex M8R. It is in need of repair and was wondering if anyone could help. There is a capacitor that is attached to the mains and the motor that needs to be replaced.
If anyone is familiar with this projector could they possible direct me to a replacement?
The values on the cap are 0.2 + 2 x 0.0012 uf. To me it looks like three caps in one (1 x 0.2 uf and 2 x 0.0012 uf caps). I have no idea how these are connected internally.

The problem is that the motor is racing. Any advice on getting this beauty back in action would be very much appreciated.

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Rob Watson
Junior
Posts: 22
From: Sheffield, UK
Registered: Apr 2005

posted June 18, 2012 11:24 AM

Thats the motor noise suppression capacitor. It is there to stop the motor interfering with other electrical equipment. Its clearly dead. You can replace it with a three lead motor supression capacitor or you can simply disconnect it. It wont make any difference to the projector. I'm not an expert so dont quote me on it, but this looks like a suitable replacement.

http://www.maplin.co.uk/delta-suppression-filter-501

The M8 gets very hot. The motor and lamp run at 120v and the european 240v supply is dropped to 120v by a huge coiled resistor behind the voltage selection panel. To prevent the projector overheating there is a mechanism which prevents the motor from falling below a certain speed. If you turn the speed knob down too low the motor will alternately slow down and race as the speed control mechanism cuts in and out.

Rob

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Peter O'Grady
Junior
Posts: 3
From: Dublin, Ireland
Registered: Jun 2012

posted June 18, 2012 03:09 PM

I really appreciate your help. Sure enough, when I turned the speed control up a little, the projector was as smooth as silk. I'm very green when it comes to projectors, this is my first delve into 8mm!

I'll order that suppression filter and replace it. Thanks again for the help!

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Rob Watson
Junior
Posts: 22
From: Sheffield, UK
Registered: Apr 2005

posted June 19, 2012 06:36 AM

Well I'm very glad that was useful.

As you will have found out, the M8 is noisy but it becomes a lot quieter and runs more smoothly after a thorough oiling. There are a couple of oiling points on the top of the machine but you can really get to the innards by taking off the side which holds the lamphouse door. You'll then see that the front oiling point connects to a wick which carries oil to various bits of the machine. That wick will absorb quite aa lot of fresh oil before it gets overloaded....

Rob

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Peter O'Grady
Junior
Posts: 3
From: Dublin, Ireland
Registered: Jun 2012

posted June 19, 2012 12:48 PM

I've taken apart and cleaned the internals. Oiled and polished the lense (it was filthy!). It made a big difference to the lamp brightness. All I need to do now is get some film!

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James Davies
Junior
Posts: 1
From: Tondu, Wales, UK
Registered: Jan 2013

posted January 22, 2013 04:04 PM

Hi

Just wanted to say thank you for the questions and answers in this thread.

Bought an M8 yesterday, got it home, plugged it in and it went bang! Discovered it was the capacitor that had gone, did a search on the Internet and found this thread.

Removed the cap and the projector ran fine, today I bought and fitted a new cap and it is still working fine. Got the cap from Maplin as recommended.

Once again thank you.

Regards,

James

--------------------
Bolex BL8, Bolex H8 Rex4 Reflex, Bolex H8 Standard, Bolex M8-R Projector

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Rolf Maag
Junior
Posts: 1
From: Greifensee, Switzerland
Registered: Dec 2018

posted January 03, 2019 01:17 PM

Hi
I might have the same problem, (motor not running)
what do I have to open to access to the cap?
(I tried to unscrew but with no success)

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