9 Jun
2015
9 Jun
'15
11:08 a.m.
Folks,
Trying to source a non-DEC fan for a 4100 CPU since getting them in the UK
is more and more tricky as time goes on. The originals are 12V 0.17A 60mm
3-wire and I've found some almost-identical-but-not-quite 0.18A variants.
Needed to rewire the plugs to match (12V, sense, gnd) but the machine
reports 'CPU0 Fan Fail' despite the fact the fan is running at speed.
Is +0.01A enough to make the monitor board think the fan's failed? Board
itself is fine as it works with its existing fan.
Cheers,
--
adrian/witchy
Owner of Binary Dinosaurs, the UK's biggest home computer collection?
www.binarydinosaurs.co.uk
10 Jun
10 Jun
5 a.m.
On 6/9/2015 8:08 AM, Adrian Graham wrote:
Folks,
Trying to source a non-DEC fan for a 4100 CPU since getting them in the UK
is more and more tricky as time goes on. The originals are 12V 0.17A 60mm
3-wire and I've found some almost-identical-but-not-quite 0.18A variants.
Needed to rewire the plugs to match (12V, sense, gnd) but the machine
reports 'CPU0 Fan Fail' despite the fact the fan is running at speed.
Is +0.01A enough to make the monitor board think the fan's failed? Board
itself is fine as it works with its existing fan.
Cheers,
On a Pee Cee, one of the 3 wires is a tachometer output. The tach signal
is a logic signal that pulses when the fan rotor is in a particular
position. Some fans pulse once per rotation. Others are multiple times
per rotation.
Why do you think it measures the fan current?
What the the tach signal look like on the good fan?
Is the tach signal pulsing?
Rob.
2:13 p.m.
On Tue, 9 Jun 2015, Adrian Graham wrote:
Trying to source a non-DEC fan for a 4100 CPU since
getting them in the UK
is more and more tricky as time goes on. The originals are 12V 0.17A 60mm
3-wire and I've found some almost-identical-but-not-quite 0.18A variants.
Needed to rewire the plugs to match (12V, sense, gnd) but the machine
reports 'CPU0 Fan Fail' despite the fact the fan is running at speed.
I too found I could not find a sufficiently similar fan to run in a 4100
without being seen as a fan failure so I ended up rebuilding them. These
are fans have replaceable bearings so I took mine apart, measured the
bearings with calipers, and purchased a dozen replacements from a random
web bearing supplier. That was three or four years ago, if I hunt very
hard then I might the name of the vendor and the part number but right
now my basement office is in boxes as we clean up renovate after a burst
water pipe.
--
Richard Loken VE6BSV, Unix System Administrator : "Anybody can be a father
Athabasca University : but you have to earn
Athabasca, Alberta Canada : the title of 'daddy'"
** richardlo at admin.athabascau.ca ** : - Lynn Johnston
6:20 p.m.
On 06/10/2015 01:13 PM, Richard Loken wrote:
On Tue, 9 Jun 2015, Adrian Graham wrote:
Boca Bearings has just about any bearing you could want. I've rebuilt
some noisy Dell computer fans with their bearings.
Jon
Trying to source a non-DEC fan for a 4100 CPU
since getting them in the UK
is more and more tricky as time goes on. The originals are 12V 0.17A 60mm
3-wire and I've found some almost-identical-but-not-quite 0.18A variants.
Needed to rewire the plugs to match (12V, sense, gnd) but the machine
reports 'CPU0 Fan Fail' despite the fact the fan is running at speed.
I
too found I could not find a sufficiently similar fan to run in a 4100
without being seen as a fan failure so I ended up rebuilding them. These
are fans have replaceable bearings so I took mine apart, measured the
bearings with calipers, and purchased a dozen replacements from a random
web bearing supplier. That was three or four years ago, if I hunt very
hard then I might the name of the vendor and the part number but right
now my basement office is in boxes as we clean up renovate after a burst
water pipe.
3331
days inactive
3332
days old
3 comments
4 participants
participants (4)
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binarydinosaurs＠gmail.com -
jonelson126＠gmail.com -
radioengr＠gmail.com -
richardlo＠admin.athabascau.ca