8mm Forum: Filmosound Optical Lamp

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Topic: Filmosound Optical Lamp

Brian Collins
Film Handler

Posts: 96
From: Christchurch UK
Registered: Jan 2007

posted December 04, 2011 12:26 PM

Hi I am using my Bell & Howell Filmosound 644 and the optical lamp is not lighting up. Have done a continuity test on the lamp and that shows it is OK, is there a fuse for this or have I to look for some other fault? have moved the top lever to sound if that has any bearing on it,any help appreciated.

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Pasquale DAlessio
Film God

Posts: 3523
From: Bristol,RI, USA
Registered: May 2010

posted December 04, 2011 04:04 PM

Brian

Check for voltage at the contact points in the lamp socket.

PatD

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Brian Collins
Film Handler

Posts: 96
From: Christchurch UK
Registered: Jan 2007

posted December 05, 2011 03:08 AM

Pat
No voltage at all, so will have to investigate why.

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Simon McConway
Phenomenal Film Handler

Posts: 1085
From: Doncaster, UK
Registered: Jun 2004

posted December 06, 2011 05:40 PM

According to the service manual, check the rectifier. Having never attended to such a fault on this machine, I'm not fully sure of the details you'll need, but I'm presuming this will be at the base of the machine, in the amplifier board. Trace the wires back from the exciter lamp and you'll see a rectifer of either the bridge type, or single diodes. Check these out, if the wiring proves okay.

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Brian Collins
Film Handler

Posts: 96
From: Christchurch UK
Registered: Jan 2007

posted December 08, 2011 10:40 AM

Thanks Simon, I have had to shelve the job for the time being but will certainly check what you advise when I get round to it again.

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