That's what I figured. So I guess I'll just wait and see if the correct cable
turns up. Thanks for the warning.
I'll pull the motherboard out today and see if the capacitors (and which ones)
are leaking. Where's a good place to order new ones?
-Elliott Price
Mac Computer Repair - Santa Barbara
Graphic Design - Artwork Setup
Websites - Low Cost Custom Websites
On Jan 4, 2010, at 11:30 AM, Doug McNutt wrote:
> At 11:04 -0800 1/4/10, Elliott Price wrote:
>> A SCSI cable won't work with the printer though, correct? So basically one
>> end should plug into the serial port, and one end into the SCSI-like port on
>> the printer?
>> What would you recommend for the capacitors? Dishwasher? Replacement?
>
> Careful. Those 25 pin "D" connectors are almost always RS232 serial
> connectors in the computer world. On a printer that changes to a just
> "always" but printers almost always get the sex of the connector wrong for
> the RS-232C specification. Thus serial printer cables are different from
> modem cables. Sigh.
>
> Apple, confronted with a deficiency of space on the backside of the Mac Plus,
> chose to use the same 25 pin connector for SCSI. They really needed 50 pins
> to meet the SCSI specification that included separate grounds separately
> twisted with each data line. By sharing grounds Apple got it into 25 pins but
> made it impossible to use differential SCSI for longer cables.
>
> You can't hurt an RS-232 connection by trying the wrong cable. But you can
> damage things on the SCSI side that way.
>
> As for the capacitors, I like to replace them with tantalum electrolytics.
> You don't have to get precise values. Higher voltage rating is always OK.
> Higher capacitance is an improvement. Get the polarity right. You'll still
> need careful cleaning of the board to remove any acid stains from the
> aluminum electrolytics.
>
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