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1541/1571 DRIVE ALIGNMENT for The Commodore 641128 Computer f(om Free Spirit Software & [BSD] Software Instruction Manual by Mark Brannon The 1541/1571 Drive Alignment System Is a precision alignment progrlJfll that will return your disk drive to better than new alignment, The Alignment System will automatically evaluate the alignment condition of your drive and provide you with the necossary Information to realign your drive, with friendly 'on-screen' help available at all times The Alignment system Is'des
Why dlJk ~rlves need alignment? Commodore disk drives use a moveable readlwrite head that Is connected through a mechanical linkage to a stepper motor. this stepper motor Is In turn controlled by the disk drive microprocessor. During readlwrlte activity, the microprocessor moves the head over the disk surface collecting (or writing) data.
Disassembly and adjusting For all models of disk drives covered by this program, the basic adjustinu procedures will be the same. The Idea Is to make VERY SMALL adjustments to the stepper motor that will place the readlwrite head In the location the microprocessor has ordered. PatIence Is required as satisfactory results will not happen instantly. The basic alignment procedures are not complex, but some mechanical ability Is required.
r--- ---- ---- ---- --.. -.---------... -.--. ---- -The 1~1 Drive Coue screm Unplug all ubles before beginning. The 1~1 Drive Power light plug Remove shroud Chauls lClfWI 1 ptr side All Orlv .. (but the late model 1571) , o C' loosen screws 10 -----Jr-----_-' .
The 1571 drive: There are two versions of the 1571. The early version ha~ a stepper motor and head movement linkage functionally identical to the 1541. The later version has above-dlassis side-mounted stepper motor. To determine which version you have, remove the 4 screws from the underside of the drive and remove the upper cover. On both versions the chassis is divided into two parts, the drive assembly and the drcult board. The later version will have a thin metal shroud over the drive assembly.
Checking and Adjusting Drive Motor Speed and Head Stop Position. 1541 Drive (SX·&4) Drive motor speed and head stop position are fully adjustable on the 1541 drive. However, routine adjustments to these are not recommended. Both the Drive Speed and Head Stop adjusting screens are accessed from the Alignment Screen. Before selectIng either of these options, use the [I) command to Initialize the calibration disk.
Loading with a miss-aligned drive: For single drive systems that the drive is so far out of alignment that it will not load the Alignment System, the following is a method of loading that will work gIven some time and patience. FIrst, disassemble the drive and loosen the stepper motor screws. Re-connect the drive. If the drive Is a 1571 (and 128 computer), DON,. try to autoboot Shift It to C-64 mode with the reset button and Commodore key.
Limited Warranty Free Spirit Software, Inc. warrants that the diskette on which the enclosed program is recorded will be free from defects In materials and workmanship for a period of 90 days from the date of purchase. If within 90 days from the date of purchase, the diskette proves defective In any way, return it to Free Spirit Software, Inc., 905 W. HlIIgrove, Suite 6, La Grange, IL 60525 and Free Spirit will replace It free of charge. Free Spirit Software, Inc.
154111571 CiRitfr /U.iGiiiViiiii 1541/1571 Drive Alignment reports the alignment condition of the disk drive as you perform adjustments. On screen help Is available while the program Is running. Includes features for speed adjustment and stop adjustment. Complete Instruction manual on aligning both 1541 and 1571 drives.
