Arfa Daily wrote in message
...
"N Cook" wrote in message
...
Meat Plow wrote in message
...
On Mon, 11 Feb 2008 16:09:24 +0000, N Cook wrote:
2 temp sensing things , one vaguely touching , the other bent away
from
the
heatsink.
Perhaps every roadie should be put in a flight case and dropped down
some
stairs as a lesson.
Anyway both heatsinks must have bent relative to the pa pcb, bending
the
leads.
How to anchor back more firmly than just white paste? The main TOP66
power
devices etc have those slide on spring steel clips but the loosened
TO92
tranny and fan thermistor are a long way down from the mounting
slots,
for
anything like that. Any ideas ? - live heatsink btw, hence not
rigidly
held
to body.
Could you drill into the heatsink and make some sort of spring clip
mount?
How about some duct tape 
Those sensors don't have to be driven into
the heatsink, just held against along with a little compound.
The band is off touring abroad from the end of the week. All I can think
is
to secure bits of nylon cable tie to the pa pcb and bend up against the
2
errant items. Too crowded to drill/tap the heatsinks and the assembly of
these sort of hook-clip arrangements is realy make once,
dissamble/reassemble at your peril.
How about sticking them to the heatsink, with thermal glue such as is used
to stick heatsinks to chips ?
http://uk.farnell.com/jsp/Mechanical...ives,+Tapes,+S
ealants+&+Service+Aids/FISCHER+ELEKTRONIK/WLK+5/displayProduct.jsp?sku=12117
23
or better yet
http://www.maplin.co.uk/Search.aspx?...source=15& SD
=Y
Arfa
Would need good cleaning off I suspect, before applying. I'm not sure it
would cure a repeat drop. This is a likely generic fault scenario for all
such "live heatsink" amps that are only fixed to flexible polyester pcb
board
Something similar to the tape was supposed to be keeping a duaghter board
marked EB SUB ? (not on the Ashdown supplied schema, 4013 and 3 x 072) fixed
to the preamp but dislodged in the same drop presumably, failed solder
joint/s leading to crackles.
I removed 2 nearby caps , 2 small holes ,to match cap pin spacing, in cut
down lengths of cable-tie , and soldered back in, regooing and positioning
the 2 shiftees. Volume was fading down after half hour of use, presumably
because the NTC fan thermistor was staying at room temp and fan speed not
upping with increasing heatsink temp.
--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/