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VK2AAB > TECH 24.09.03 01:44l 21 Lines 807 Bytes #999 (0) @ WW
BID : 58847_VK2AAB
Read: DB0FHN GUEST OE7FMI
Subj: Re: Power supply fan mod
Path: DB0FHN<DB0RGB<DB0MRW<DB0ERF<DB0FBB<DB0BI<DB0NOS<DB0EA<DB0RES<ON0AR<
VK6HGR<ZL2TZE<VK5UJ<VK5BRC<VK5ATB<VK2AAB
Sent: 030923/2243Z @:VK2AAB.SYD.NSW.AUS.OC #:58847 [SYDNEY] FBB7 $:58847_VK2AAB
From: VK2AAB@VK2AAB.SYD.NSW.AUS.OC
To : TECH@WW
I read David G4EBT's bulletin with interest.
One point though, it does not seem to have short circuit protection.
I accidently shorted the output of mine and one of the output transistors went
short circuit and the output went up to 24 volt. Fortunately my FT920 seems to
have over voltage protection and switched itself off.
I can agree that the physical construction is a nightmare.
The transistor that failed in mine was on the lower level of the heatsink
which made it very difficult to get at.
One thing anyone with one of these power supplies should check is that the
vents in the cover are at the front. It looks like the cover could be put on
backwards. This would of course keep the airflow away from the heatsink.
73 Barry VK2AAB
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