Compaq Portable 286 Compaq Portable Computer, Compaq Plus Personal Computer, a - Page 126

for the COMPAQ Portable or COMPAQ PLUS Personal Computers 360 Kbyte

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IS THIS THE CORRECT FORMAT (Y/N) The number of tracks for a 320 Kbyte diskette is 40 and the number of sectors is 8. For a 360 Kbyte diskette, the number of tracks is 40 and the number of sectors is 9. For a 1.2 megabyte diskette, the number of tracks is 80 and the number of sectors is 15. Adjusting the Speed Each time the index hole of a soft sectored diskette passes the index detector circuitry, this circuitry automatically generates a signal pulse. As the diskette rotates, the diskette drive speed stabilizes (usually within 5 to 6 seconds), and the speed test program can calculate the time span between these index pulses. 1. If you followed the preliminary steps to the point of selecting the diskette speed test from the diskette diagnostic menu, you see a message showing the current rotation speed of the diskette drive being tested. A display similar to the following appears: THE DISKETTE DRIVE SPEED IS 1667 THE SPEED SHOULD BE IN THE RANGE 1640 TO 1690 PRESS ANY KEY TO EXIT THE TEST NOTE: The rotational speed value is sometimes displayed in two formats. Both formats express the same value, but in different terms. The speed adjustment procedure usually refers to the value in parentheses (that is, the value expressed in ms). 2. Wait approximately 5 to 6 seconds, or until you see the displayed value stabilize. Remember that this is a continuously cycling test on a COMPAQ Portable or COMPAQ PLUS. The values will continue to scroll up the display. If you are testing a COMPAQ PORTABLE 286, the speed will not scroll after it has stabilized. 3. Check the value for diskette rotational speed. The optimum speed range for the COMPAQ Portable or COMPAQ PLUS Personal Computers 360 Kbyte Diskette Drive is from 196.0 to 204.0 ms. The optimum speed range for a COMPAQ PORTABLE 286 Personal Computer 1.2 Megabyte Diskette Drive is from 164 ms to 170 ms. 4. If the displayed value is out of the specified parameters, locate the speed adjustment potentiometer on the printed circuit board attached to the diskette drive. See Chapter 7, "Removal and Replacement Procedures," for the location of the 360 Kbyte diskette drive and the 1.2 megabyte diskette drive. 5. Use a small, flat bladed screwdriver and turn the adjustment screw slightly. If the displayed value is greater than the specified parameters, turn the adjustment screw clockwise; if the displayed value is less than the specified parameters, turn the adjustment screw counterclockwise. Keep turning the speed adjustment screw in small increments until the speed of the diskette drive is within plus or minus 1 percent of the specified value. NOTE: The diskette drive(s) in the COMPAQ Portable, COMPAQ PLUS, and the

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IS THIS THE CORRECT FORMAT (Y/N)
The number of tracks for a 320 Kbyte diskette is 40 and the number of sectors
is 8. For a 360 Kbyte diskette, the number of tracks is 40 and the number of
sectors is 9. For a 1.2 megabyte diskette, the number of tracks is 80 and
the number of sectors is 15.
Adjusting the Speed
Each time the index hole of a soft sectored diskette passes the index detector
circuitry, this circuitry automatically generates a signal pulse. As the
diskette rotates, the diskette drive speed stabilizes (usually within 5 to
6 seconds), and the speed test program can calculate the time span between
these index pulses.
1. If you followed the preliminary steps to the point of selecting the
diskette speed test from the diskette diagnostic menu, you see a message
showing the current rotation speed of the diskette drive being tested. A
display similar to the following appears:
THE DISKETTE DRIVE SPEED IS 1667
THE SPEED SHOULD BE IN THE RANGE 1640 TO 1690
PRESS ANY KEY TO EXIT THE TEST
NOTE: The rotational speed value is sometimes displayed in two formats.
Both formats express the same value, but in different terms. The speed
adjustment procedure usually refers to the value in parentheses (that is,
the value expressed in ms).
2. Wait approximately 5 to 6 seconds, or until you see the displayed value
stabilize. Remember that this is a continuously cycling test on a COMPAQ
Portable or COMPAQ PLUS. The values will continue to scroll up the
display. If you are testing a COMPAQ PORTABLE 286, the speed will not
scroll after it has stabilized.
3. Check the value for diskette rotational speed. The optimum speed range
for the COMPAQ Portable or COMPAQ PLUS Personal Computers 360 Kbyte
Diskette Drive is from 196.0 to 204.0 ms. The optimum speed range for a
COMPAQ PORTABLE 286 Personal Computer 1.2 Megabyte Diskette Drive is from
164 ms to 170 ms.
4. If the displayed value is out of the specified parameters, locate the
speed adjustment potentiometer on the printed circuit board attached to
the diskette drive. See Chapter 7, "Removal and Replacement
Procedures," for the location of the 360 Kbyte diskette drive and the
1.2 megabyte diskette drive.
5. Use a small, flat bladed screwdriver and turn the adjustment screw
slightly.
If the displayed value is greater than the specified parameters, turn the
adjustment screw clockwise; if the displayed value is less than the specified
parameters, turn the adjustment screw counterclockwise.
Keep turning the speed adjustment screw in small increments until the speed of
the diskette drive is within plus or minus 1 percent of the specified value.
NOTE: The diskette drive(s) in the COMPAQ Portable, COMPAQ PLUS, and the