[sebhc] H17-3 Power supply

Carroll Waddell carrollwaddell at sc.rr.com
Sat Jul 29 15:42:14 CDT 2006

Mark Garlanger wrote:

> I just received an H17-3 drive case and drives. I was told that
> "The H17-3 triple drive blew a fuse when I turned it on"
> I tested the fuse, and unless he replaced it, the fuse is fine.
> What's preventing me from testing/turning on the case, is that
> there is NO diode bridge on the power supply board. There is
> the spot to put 4 diodes, but two of them are empty and the
> other two (very top and bottom) just have a wire there. I betting
> that it's putting an huge extra burden on the voltage regulators.
> The board is slightly older board than I have in my other two
> drive cases, (85-2107-2 vs. 85-2107-3), but I can't imagine that
> a diode bridge would isn't be needed. According to my Z37
> manual, those should be 3A, 100V diodes. The closest thing
> I found out the local Fry's are 5A, 100V - I'm assuming that the
> higher amps just mean they can handle more and can be
> used in place of the 3A ones. Let me know if that is the wrong
> assumption. Also, Fry's had a square little 'diode bridge', internally
> it's all 4 diodes properly connected. It's rated 8A, 100V - I don't
> remember enough of my EE to be sure if that would be proper
> to replace it. Looking at the circuit, I'm thinking that the current is
> only going through one diode at at time, therefore a diode
> bridge that was rated at 3A, 100V would be an equivalent
> replacement, so this 8A one should also be fine. Let me know if
> I'm mistaken here too.
> Thanks,
>  Mark
> -- 
> Delivered by the SEBHC Mailing List
I had a 2 drive system first, then went to a 3 drive system. If I 
remember, the power supply was just moved from 1 metal box to the other. 
The power supply should be the same one on your 2 drive box.
Be careful about the fuse. It is there to protect something else. If you 
go with too large a fuse, you might burn up the something else rather 
than the fuse.
If you want, I have a large supply of fuses of all kinds, and I will see 
if I can find you one.
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