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5.4
WRITE PROTECT SWITCH CHECK AND ADJUSTMENT
The
writ& protect switch check and adjustment establishes the correct
operation of the write protect switch, i. e. the write electronics are
disabled when a write protected diskette is used.
write Protect Switch Check
1.
Connect the drive to an exerciser or computer with a direct
monitor of the write protect output (J8, Pin 28) or, with no
power to the drive, disconnect Plug 11, and check the
continuity with an ohmeter.
2.
With a nonwrite protected diskette inserted, verify there is
continuity between the two wires of Plug 11 or there is a
nonwrite protected output to the exerciser, i. e., a high at
J8, Pin 28.
3.
With a write protected diskette inserted, verify there
is no continuity between the two wires of Plug 11 or that
there is a write protect true output to the controller or
exerciser, i. e., a low at J8, Pin 28.
NOTE
A DEFECTIVE CIRCUIT BOARD CAN BE RESPONSIBLE FOR A WRITE
PROTECT PROBLEM.
TEST POINT 2 SHOULD BE LOW FOR A WRITE
PROTECTED DISKETTE, HIGH FOR A NONWRITE PROTECTED
DISKETTE.
Write Protect Switch Adjustment
1.
Loosen the screws holding it to the bracket on the side
nearest to the front of the drive (Figure 5-2).
2.
Move the switch up or down, as required, and recheck it.
5.5
DRIVE MOTOR SPEED CHECK AND ADJUSTMENT
The
long-term drive
within
the specified
~
1.5 percent.
Drive Motor Check
motor's
speed
adjustment
ensures the speed is
tolerance.
The motor speed tolerance is
300
RPM
1.
Verify power:
+12 volts D. C. + .6 volt
+5 volts D. C. + .25 volt
2.
Apply power to the drive.
5-4
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