Thema:	How to add a HDD LED to your model 95
Von:	Jim Shorney <jshorney@inebraska.com>
Datum:	Fri, 02 Jul 1999 23:47:50 -0500

Here it is, folks!

Parts required:
An LED of the size, shape, and color desired
One .25 Watt, 330 Ohm resistor
Two short lenghts of small-guage hookup wire
Some small heat-shrink tubing
An IBM Model 95

Tools required:
Soldering iron
Wire strippers/cutters

Intructions:

1. Trim the leads of the resistor and the anode lead (the long leg) of
the LED short, and solder one lead of the resistor to the anode of the
LED.

2. Solder the two lengths of hookup wire to the other resistor lead and
the cathode (short leg) of the LED.

3. Cover the soldered connections with the heat-shrink tubing and, well,
"heat shrink" it.

4. Pull your 95 apart, and unplug and remove the operator panel display
PCB (you do know how to do this, right?).

5. Secure the LED in your desired mounting location (more on this in a
bit) and cut and strip the two free wire ends to length; the anode lead
(the one coming from the resistor) will be soldered to pin 4 of the
ribbon cable connector, and the cathode lead will be soldered to the
frontmost of the two speaker connector pins (ground).  Make your
connections on the bottom of the PCB.

6. That's it!  Install the PCB back in your model 95, taking care not to
snag your wires as you slide the PCB back in.  Enjoy your hard disk
light!

Now, as to mounting location for the LED...  Being into vintange ham
radio gear, I subscribe to the "drill no holes" school of mods.  Finding
a suitable location for the LED, without altering or detracting from the
aesthetics of the machine, is the hardest part of this adventure.  My
first experiment was to tie the new (red) LED to the existing power LED
with a cable tie, so they are side-by-side.  This results in an
interesting green-to-red/green effect when disk access occurs that can
be varied by adjusting the positioning of the LED's behind the bezel,
but the result is not easily discernable from a distance or over a very
wide viewing angle.  Another thought that occurs it to somehow fix a
square or rectangular (or some other interesting shape) green LED behind
the operator panel window, either dead center above or below the
operator display, or in one of the corners.  I may experiment along
those lines when I get my hands on some LED's that are other than round.

While I'm at it, I may just replace the power LED with one of these blue
LED's that I have around here.  Seems apropriate...

This info will appear on my web site.  Someday.


--
Jim Shorney
jshorney@inebraska.com
Lincoln, NE, USA
http://incolor.inetnebr.com/jshorney