8mm Forum: Problem with Elmo SC-30 Lamp

This is topic Problem with Elmo SC-30 Lamp in forum 8mm Forum at 8mm Forum.

To visit this topic, use this URL:
https://8mmforum.film-tech.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=010697

Posted by Robert Saraceno (Member # 4422) on May 13, 2016, 10:00 AM:

Has anyone ever had a problem with their projector blowing bulbs?
I just purchased an an Elmo SC-30, when it arrived the bulb was burned out, I put a new EFR bulb in and it immediately blew it as soon as I hit forward. I got this bulb off Ebay so I don't know how old it is, but I just wanted to know if anyone has seen this before - any advice would be appreciated.

Thanks in advance

Posted by Dominique De Bast (Member # 3798) on May 13, 2016, 10:09 AM:

I had that problem with a 100 volts projector I plugged on the 220 volts net but as you live in the US, that cannot be the same problem as you use 110 volts there.

Posted by Maurice Leakey (Member # 916) on May 13, 2016, 10:17 AM:

quote:
as soon as I hit forward

I assume you mean the "lamp on" position. It is possible that the new lamp was faulty.
Have you a test meter that can check for faulty connections such as anything going to earth (ground) that should not be, also you could see if 15 volts is at the lamp-holder.

Posted by Barry Attwood (Member # 100) on May 13, 2016, 11:14 AM:

You could also check that no more than 12v is going to the lamp, if so it may be an electrical fault, perhaps a transistor or something similar, then you'd have to get it looked at.

Posted by Andrew Woodcock (Member # 3260) on May 13, 2016, 11:19 AM:

15vac as Maurice says Barry, according to this;

http://super8wiki.com/index.php/Elmo_HiVision_SC-30_Projector

And yes, please do check first that the machine is set to run safely on a 110v 60hz supply.

Lamp circuits, tend to be very simple in their make up. No transistors etc in circuit typically.

You have a lamp holder, a switch, a fuse and a transformer typically, and besides some cable and connections, not a great deal else.

You may have a faulty lamp connector that is causing a short circuit or maybe a faulty switch or power supply to the lamp.
With only this to go off, who knows for certain?

Either way, it shouldn't be difficult to diagnose with a multi meter given the very few components making up this circuit here.

Posted by Robert Saraceno (Member # 4422) on May 13, 2016, 02:18 PM:

I left out some info earlier - the projector is from Japan, and runs at AC 100v 50 or 60 hz only, no internatonal voltage. I've run other Elmo projectors set at 100v on 110v power and not had the same problem. The motor, amp, and everything else works fine, I ran film through it already. I have to get a new volt meter, I seem to have misplaced my old one.

UBB.classic^TM 6.3.1.2