READY FOR INPUT
C1571 ROM Installation Notes
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Well, my new ROM arrived today for my (singular) 1571, and as you can well 
imagine, I wasted little time in plowing into it!  The whole procedure was 
quick and painless, but here are the specifics for those who feel a bit 
queasy about the whole thing.

First, most repeated, and most tiresome, removing the cover of your drive 
will automatically void the warranty.  If your drive is still under 
warranty, or if you are don't feel up to this sort of procedure at all, 
please have the operation performed by an authorized CBM service center or 
someone else who will guarantee the work.

Step 1:
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     Turn off your drive and computer and detach the serial and power 
cables from the drive.  I placed a blank disk in the drive and close the 
door, as I do whenever I move a drive about, to secure the heads.

Step 2:
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     Place the drive upside down on a soft workspace.  You will need a 
small Phillips screwdriver, and a small non-conductive tool of some kind to 
pry the chip up with.  Locate and remove the four screws holding the case 
together.  Turn the drive right side up, and lift off the upper half of the 
case.  It should come free very easily.  Set this aside.

Step 3:
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     You should now see a large rectangular box covered with sheet metal at 
the rear of the drive enclosure.  This is the power supply, and must be 
removed to gain access to the ROM chip.  It is secured at each corner by a 
Phillips screw.  Remove these and place them aside.  Now you should be able 
to gently lift the power supply and stand it on its side on the drive 
mechanism itself, without detaching any of the ground wires or cables.  
This will expose the circuit board underneath.

Step 4:
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     As you look at the drive from directly in front, the ROM chip we are 
interested in is the second from the left at the far rear.  It is slightly 
elevated above the surrounding chips.  The circuit board is marked "U2" at 
one end of the chip, and "C2" at the other.  Mine was also labeled with the 
part number: "310654-03".  Note that there is a small notch at one end of 
the chip.  This matches a similar notch on the circuit board diagram, and 
serves to tell you which way the chip goes in.  Once you have identified 
the correct chip to your satisfaction, you are ready to extract it.

Step 5:
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     These chips CAN be zapped by static electricity, although I myself 
have never done it.  You should make sure that you are at an equilibrium 
with the electrical potential of the drive before proceeding (touching the 
power supply shielding should do it).  Now the tricky part.  Carefully pry 
the old chip out.  Gentle force should enable you to work it out without 
damage.  Stick it into the other side of the conductive foam strip the new 
chip comes on, and take the new one out.  Making sure that the notch is 
facing the right way, set it in place.  Some of the little legs may be 
splayed out too widely to fit easily, these should be bent carefully 
inwards.  Check to be sure that each leg fits easily into its socket, then 
rock the new chip down firmly into place.

Step 6:
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     Place the power supply back in place and screw it down.  Put the cover 
back on the drive, and screw it back on.  You are done!  Hook up the drive, 
put in an old 64 format disk, and listen.  Voila, no more chattering!
Thanks, CBM!

                           Kevin Stevens