| JTB |
Hi,
My projector seems to be dead. I turned it off last night, turned it on tonight and....nothing. No light. No fan.
There is a fuse and it looks like it's ok. I'm going to get a new fuse tomorrow anyway, but is there anything else I can look at besides the fuse? A reset switch? Anything?
It's an Elmo HP A305SQ.
Thanks. |
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| JTB |
Hi.
It's the fuse. My only problem now is, what size fuse? I can't read anything on the current fuse but "FUJITA". Does anyone know?
Thanks. |
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| echow87 |
| Maybe get a fuse that is rated the same for your bulb. Or check elmo ohp site. |
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| JTB |
Been to the Elmo site. If anyone has the same model or similar projector and you can check your fuse, I'd appreciate it.
Thanks. |
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| li_gangyi |
| you can try caluculating the fuse rating with a bit of maths...what's the power of your bulb?? in Watts that is...and we need to know the voltage |
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| JTB |
The bulb I'm using is a long life 36V, 400W. It's the Xenophot HLX 64665.
Thanks. |
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| li_gangyi |
| take 400 divide by 36...and you get 12A approx...a 15A fuse should be good...was the original fast or slow blow?? |
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| JTB |
| Thanks. I don't know if it's fast or slow. I've read the forum a little and was going to get a slow blow. I just tried Radio Shack and they didn't have anything. |
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| Dazzzla |
| quote: | | take 400 divide by 36...and you get 12A approx...a 15A fuse should be good...was the original fast or slow blow?? |
:smash:
Do not put a 15A fuse in that projector, if your mains supply is 240VAC then 15A*240V=3600W or 110VAC then 15A*110V=1650W. When a fault condition accures, All of your precious electronic smoke will be lost.:bawling:
Yes 400W/36v=12A, but it is 12A at 36V not 12A at your mains supply. To approximate the fuse value, use the lamp wattage of 400W and divide by your mains supply, 400W/240V=1.7A or 400W/110V=3.6A. This is only an approximate value for the lamp only, it doesn't allow for transformer loss or power used in the rest of the circuit. If the projector fires up with that value fuse but fails after it has warmed up increase the fuse value but don't increase it beond 125%. |
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| JTB |
| Thanks. I'll start with 3.6. |
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| JTB |
I found out for sure. It's 125v 7A.
Thanks to everyone for the help. |
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| li_gangyi |
| why the strange value?? and opps...I thought the fuse was in the secondary...I suppose the fuse is a fast blow then?? |
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| JTB |
I don't know anything about it. I was looking at some PDF manuals for some other OHPs and I noticed they had all the technical information on a UL sticker somewhere on them. I figured I'd look at mine for the same UL sticker and as soon as I opened the top, I saw a sticker right next to the fuse holder that says: "125V 7A". I never saw it before because it's dark in the room. Also the sticker is exactly the same color as the metal that it's stuck to.
I don't know if it's fast blow or not. The manuals I was looking at - for completely different OHPs, even a different brand - required 3.5A fuses and they were calling them "slow acting".
This fuse might have blown, or "something", about 2-3 weeks ago. There was a pop, the unit shut down completely, I happened to notice the fuse, I took it out and looked at it, it looked fine, put it back in and the unit worked again until yesterday night. |
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