Thanks for all responses. Modification went smoothly (to recap, I
removed HIP6004, installed HIP6004BCB).
Have just installed a 1.4G Celeron on a Slot-T. Booted first time,
Win2K Pro seems happy as well. No problems so far...
One more question... the HS/fan assy didn't come with a temperature
probe. What can I use for this? Thanks once again.
Kind regards, Paul H.
An NTC thermistor, beta=3435, R25=10K ohms. Originally sold as
the Asus P2T cable. Plug it into the TRCPU header near the CPU_FAN
header. If you were to plug a 10K ohm fixed resistor into TRCPU,
then Asus Probe or Motherboard Monitor (MBM5) would read 25C as
the temperature. For example, try searching groups.google.com
for "P2T" or try "beta 3435" and see what pops up.
Definition of beta:
Beta 25C-85C = ln(R_25/R_85) Resistance at 25C and 85C
-------------
(1/298.15 - 1/358.15)
One spec is Beta and the other way of stating it is percent change
per degree C. Looks like a beta of 3435 is roughly a %/degC of -3.84.
http://www.venkel.com/FinalPDFs/PID_NTC.pdf
Beta %_change_per_degree_C
3400 -3.80
3420 -3.82 %/degC
3450 -3.86
3500 -3.91
Working the beta equation backwards, R_25/R_85 = 6.89 when beta
equals 3435. That ratio is a third way of specing the curve for
the thermistor.
I just noticed in my Digikey catalog, that Panasonic makes a
couple of parts:
Digikey P12011CT-ND 0603 10K beta=3435 (25C to 85C) +/-1% $0.50
(Panasonic part number ERT-J1VG103FA)
Digikey P12007CT-ND 0402 10K beta=3435 (25C to 85C) +/-1% $0.56
(Panasonic part number ERT-J0EG103FA)
The problem with these is, they are packaged like chip resistors.
Just like the resistors on the motherboard. The 0402 device is
so small, it looks like a grain of pepper. These devices don't
have wires on them, and soldering the devices could change the
characteristics. You are allowed 270C for three seconds while
soldering.
Digikey also has some Chipquik, a low temp alloy for reducing
the temperature that solder melts at. Maybe that could be used
while reflow soldering some wires onto one of these. I can
promise you, this would be a most frustrating exercise. Surface
mount resistors tend to stick to the tip of a soldering iron, so
reflowing a pair of wires to one of these would be tough. The
0402 is so small, you'll need a magnifier or a microscope to work
with it. (The Digikey part number for the Chipquik is SMD1-ND
$15.00 .)
An alternative would be to find a conductive paint, like the
material in a defroster repair kit, and locate the chip resistor
between a pair of twisted insulated wires. But this still
sucks mechanically.
This is the Panasonic info on their NTC resistors:
http://www.panasonic.com/industrial/components/pdf/ARG0000CE1.pdf
I've looked several times now for a good NTC thermistor, and this
is the closest I've got to a solution yet
The Radio Shack
271-110A used to be perfect for the job, but is no longer stocked.
The thermistors packaged in a glass envelope, and almost as small
as the devices above, would be an ideal solution. But, I still
haven't found one that fits the requirements.
HTH,
Paul
