My 3400 refuses to boot properly, if at all, unless a
powered, external SCSI device is attached. I can't
tell with a magnifying glass if any components fell
off the logic board after a heavy crash on a concrete
floor. I did find a tiny rectangular yellow bit (1/16
x 1/16 x 1/8 in.) with two flat, gray hooks (probably
metal), bent inward and almost flush. There are some
imprinted characters on the other long end but they
are not colored and too faint to read. If this fell
off the logic board, would it be a resistor?
Finding it's position will be quite a task, and how
would it be attached to the logic board?
George
--- [EMAIL PROTECTED] wrote:
> >My conclusion is the opposite -- there is an
> internal terminator at the
> >controller since they make no mention of adding one
> at that end. But only a
> >schematic would resolve the issue.
>
> These controllers (more accurately termed "Host
> Adapters", or "Host Bus
> Adapters") usually have an "active termination" LSI
> chip. Many
> motherboards incorporate a chip of this type as a
> functional part of
> their SCSI LSI controller chips.
>
> These chips actually detect the presence, or
> absence, of a terminator,
> and provide termination, if required.
>
> The more primitive controllers have physical
> resistor packs, so-called
> 220/330 R-packs (a 220 ohm pull-up to volts, and
> a 330 ohm pull-down
> to zero volts, the volts "return", on each and
> every SCSI signal
> line), and require that the user insert or remove
> these R-packs.
>
>
__________________________________
Do you Yahoo!?
Win a $20,000 Career Makeover at Yahoo! HotJobs
http://hotjobs.sweepstakes.yahoo.com/careermakeover
--
PowerBooks is sponsored by <http://lowendmac.com/> and...
Small Dog Electronics http://www.smalldog.com | Enter To Win A |
-- Canon PowerShot Digital Cameras start at $299 | Free iBook! |
Support Low End Mac <http://lowendmac.com/lists/support.html>
PowerBooks list info: <http://lowendmac.com/lists/powerbooks.shtml>
--> AOL users, remove "mailto:";
Send list messages to: <mailto:[EMAIL PROTECTED]>
To unsubscribe, email: <mailto:[EMAIL PROTECTED]>
For digest mode, email: <mailto:[EMAIL PROTECTED]>
Subscription questions: <mailto:[EMAIL PROTECTED]>
Archive: <http://www.mail-archive.com/powerbooks%40mail.maclaunch.com/>
Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
