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Old 18th November 2004, 01:22 AM   #11
Regal1 is offline Regal1  United States
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no, the fan is installed in the factory location, on a sheetmetal mount in the middle of the board, I have removed it and it spins just the same as when mounted. The fan spins fine when hooked up to my power supply, but i haven't yet measured the current draw on it while running.

one of the only things i do not have is a scope, i have a few DMM's and freq generators. Do you think i could measure this with a DMM set to AC voltage?

This is quite perplexing.

(when you place your finger in the middle of the fan motor, it is quite hot, not just from radiant temps in the enclosure)
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Old 18th November 2004, 01:28 AM   #12
sdoom is offline sdoom  Germany
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Not sure, what are the readings on AC ? Problem is, most DMM s are only accurate on sinewave , not on square voltage.


Does your DMM have a diode-test function ? You could check the transistor that powers the fan. It is perplexing to have voltage but no spin.........

I assume the old housewife-trick ( hit the damn thing) isnt gonna work
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Old 18th November 2004, 01:31 AM   #13
sdoom is offline sdoom  Germany
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BTW. Do you have another fan ? Maybe one out of an old computer power supply or a CPU-cooler. Just to really make sure it is NOT the fan. Sorry if I am annoying , but I always doublecheck electronics

Hm, can you follow the lines on the curcuit board ? Whats the part number of the transistor ?
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Old 18th November 2004, 01:44 AM   #14
Regal1 is offline Regal1  United States
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i do have a fan that i will check soon.

the transistor's that are in the circuit (not sure if both are in this, the traces are so small, i cant see which does what without removing them.)

Kia 7805A is the larger of the two

the other is listed as:
B631K
Y 407
on the transistor itself.
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Old 18th November 2004, 02:00 AM   #15
sdoom is offline sdoom  Germany
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Ok. Those are the transistors:

KTB631 = 2SB631 . That is a PNP transistor

If you look from the top the pins will be (from left to right)

XXXXX
XX XX
XXXXX <----- Transistor
XXXXX
XXXXX
X X X
X X X
X X X
X X X
X X X


E C B

__________________________________________________ _

KIA7805 = A7805 is a 3pin voltage regulator IC , 5V

front view

XXXXXX
XX XX
XXXXXX
XXXXXX
XXXXXX
X X X
X X X
X X X
X X X
X X X

I G O (input, ground , output)

_________________________________________________
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Old 18th November 2004, 03:11 PM   #16
djQUAN is offline djQUAN  Philippines
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try adding a bypassing cap across the power terminals of the fan. about 100nF-10uF.
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