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BBS in a Box - Macintosh - Volume VII (BBS in a Box) (January 1993).iso
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In-Use light
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1991-03-29
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Adding a Drive-In-Use light to your Hard Drive
==============================================
25 March 1991
Anthony J. Oresteen GEnie: T.ORESTEEN
452 Orion Rd
Batavia, IL 60510
708/ 879-5608 {No calls after 9:30 CST please!}
*************************************************************
Legal Disclaimer: I will not be responsible for anything
that may go wrong with this modification! Do it at your own
risk! This will void most warranties if you open up your
hard drive or Mac!! If you don't have the technical skill,
have a qualified technician perform the modification.
*************************************************************
Many external SCSI drives for the Mac do not have a Drive-In-
Use indicator light. Most MS-DOS PC's have a front panel LED
that shows drive activity. My Jasmine Direct Drive 20 lacked
such an LED and I decided to add one. The drive is so quite
that at times it was hard to tell if the drive was in use or
if the Mac had crashed into an endless loop. I then decided
to install a Drive-In-Use light {hence forth called an LED
for light-emitting diode} on the front of my Jasmine SCSI
case.
Parts needed:
RADIO SHACK 276-041 Red LED's $ .69
RADIO SHACK 276-079 LED Holders $ .59
12" red wire 22 ga
12" black wire 22 ga
Plastic Electrical tape
solder
Tools needed:
Screwdriver cross tip & flat tip
Soldering iron 10 watts max
wire cutters
Electric drill
1/4" drill bit
Time needed: About 30 minutes
Disconnect all power and interface cables to the hard drive.
Ground yourself to discharge any static electricity that you
might have.
Open up your hard drive. Most hard drives have a jumper
connector for the LED. Some have the LED solder directly to
the host board. The Jasmine used a Mini-Scribe that had the
LED mounted on a 5.25" front panel. I simply cut the wires
to the LED on the 5.25" front panel and soldered in my red
and black wires. You may need to contact the drive
manufacturer to find out where to connect the LED.
Solder the red wire to the cathode (-) side of the LED. If
you are not sure which wire is negative, wrap the wires
around the led to test it before you solder. If the LED
doesn't come on when you power on the drive, reverse the
wires and retest. If the LED still doesn't work, contact the
drive manufacturer for help.
Once you have connected the LED and it lights up when you
turn on the power to the drive, wrap all solder joints with
electrical tape to prevent a short.
Locate a suitable location on the drive case (I put mine
right above the Jasmine logo on the left side) and drill a
1/4" hole in the case. Make sure you clean out all of the
drill shavings!! Bits of metal can cause your drive to
fail!. Insert the LED holder from the outside and insert the
LED from the inside. Re-test the LED again. Once everything
works, reassemble your drive being careful to make sure that
the extra wire from the LED doesn't get in the way of
anything inside the drive case.
You now can verify when your drive is in use by looking at
the LED on the front of your drive. This simple modification
makes life a bit easier when using a hard drive.
Note:
I installed my LED Feb 5th, 1990. It has worked for over a year
without any problems.
AJO