This is topic Amp problem on ST1200 in forum 8mm Forum at 8mm Forum.


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Posted by Colin Robert Hunt (Member # 433) on March 21, 2007, 02:26 PM:
 
Hi All
Having problem with one of myElmo projectors. Sound not working. Have taken back of and on the 3am fuse board have checked the fuse for the Optical sound thats ok. The other fuse for the amp had blown. Have tried replacing back keeps blowing. Any help would be appreciated. Have limited knowledge of the electrical side. Many thanks Colin
 
Posted by Kevin Faulkner (Member # 6) on March 22, 2007, 12:28 PM:
 
It could well be the output IC which has failed. This is quite common on these machines and it looks like maybe its becoming an age thing.

I did one of these machines about 2 weeks ago and used my last STK015 IC. Cant do any more untill I get some more IC's,if I can get some more.

Kev.
 
Posted by Tassos Laudas (Member # 588) on March 22, 2007, 12:34 PM:
 
It could also be due to some permanent short-circuit that might blow the fuse. Check out wether some metallic parts are in contact with the bottom side of the amplifier board.
 
Posted by Keith Ashfield (Member # 741) on March 22, 2007, 01:22 PM:
 
Hi Colin, Poor recompense I know, but it was my Elmo that Kevin fixed, and boy has it made a difference to the sound quality.
I just hope that Kevin can locate more IC's so that your problem can be solved.
P.S Kev, you have a PM.
 
Posted by Kevin Faulkner (Member # 6) on March 22, 2007, 04:50 PM:
 
Unfortunately when the Output IC goes it goes short circuit accross the output which pops the fuse as soon as you apply power to the amp.

Looks like a possible source has been found. [Smile]

Kev.
 
Posted by Colin Robert Hunt (Member # 433) on March 23, 2007, 10:52 AM:
 
Thanks Guys for the respose. Kevin if you can get this problem sorted that would be great. I know it's one of the first 1200 Elmo's, but its done very well over the years and when running still pulls in a good performance in picture and sound. I did notice some strange noises the night before it finally blew the fuse. Look forward to hearing if you manage to locate the part to fix. Many Thanks Colin
 


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