Re: Continuing the BA356 adventure...

From: Stuart Fuller (stufuller_at_usa.net)
Date: 05/27/03

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    Date: Mon, 26 May 2003 23:37:57 -0400

    Chris Scheers wrote:

    > "Bradford J. Hamilton" wrote:
    >>
    >> In article <3ED295E0.BC04B63E@applied-synergy.com>, Chris Scheers
    >> <chris@applied-synergy.com> writes:
    >> >I now have my BA356s talking to the HSZ50 cleanly, but I still have some
    >> >questions.
    >> >
    >> >The BA356 16 bit interface has two yellow LEDs by the SCSI connector.
    >> >
    >> >According to the manual, these indicate a fan failure. When a fan
    >> >fails, the corresponding LED is supposed to light up, the other fan is
    >> >forced to high speed, and Shelf_OK signals the problem at the power
    >> >supply OK light and at the cable if so jumpered.
    >> >
    >> >Does this actually happen?
    >> >
    >> >If I remove a fan, I do not get any indication of a fault. (I would
    >> >think that the complete loss of a fan is a failure, but...) In
    >> >particular, the Shelf_OK signal does not indicate the loss of the fan.
    >>
    >> I don't suppose that the LED(s) themselves are failing?
    >
    > I suppose that could be, but it is irrelevent.
    >
    > When I remove a fan, I still have a good Shelf_OK signal.
    >
    > I can test the Shelf_OK by inserting a second power supply (with no
    > power cord attached). The HSZ50 then reports a fan or power supply
    > failure. The failure is cleared when the second power supply is removed
    > (or gets power).
    >
    >
    When you first apply power, you should see the lights flash.

    I suspect that the fan is what is actually pulling down the "Shelf_OK"
    signal. Therefore, removing the fan is removing the capability of pulling
    the signal down.

    Wonder what would happen if you shoved a stick into one of the fans? I
    just did (actually, the end of a cable tie). In addition to a wonderful
    stream of dust emitting from the fan (and all over my clean white T-shirt)
    and the noise of a cable tie being inserted into a squirrel cage fan, the
    other fan sped up considerably. Since this is on a BA350, there are no
    lights to look at, but I suspect that if I had lights, one of them would be
    on. 

    -- 
        Stu
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