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9. ADJUSTMENTS AND VERIFICATIONS
9.1
Motor Speed Adjustment and Verification
(Index Period)
( 1) Insert a diskette, run the motor, and clamp. Refer to the index period column of Table 8.1 for the applicable
model.
(2)
Step to the specified track.
(3) Connect a frequency counter to the INDEX signal.
5.25-inch: TP7
3.5-inch:
IX
(4)
Check that the frequency counter readings meet the specifications in the table.
(5)
Adjustment
5.25-inch:
Turn the speed control potentiometer on the motor control circuit board until the specificatisons are satisiied.
3.5-inch:
No adjustment
9.2 Write Protect Verification
(1) Check that the exerciser's write protect lamp goes on and off as a media is inserted and removed as specified in the
table below.
Media with write protect
Media with write protect
hole open
hole closed
5:25-inch
OFF
ON
3.5-inch
ON
OFF
9.3
Head Output Verification
Use a new diskette if possible to identify head failure for this check.
( 1)
Insert a good diskette.
(2) Run the motor.
(3) Step to the track specified in the output level column of Table 8.1.
(4) Connect the oscilloscope probe as specified below.
CHl
CH2
EXT
S:.25·inch
TP1
TP2
TP7
3.S·inch
T1
T2
IX
(INDEX)
Invert channel 2 and select the Add mode.
Set vertical deflection to 10 mV /division and horizontal deflection to 20 ms/division.
(5) Write 2F (all ones) on the entire circumference.
(In case of a double-sided FOO, repeat it on sides 0 and 1 using SIDE SELECT.)
(6) Check that the average output level meets the specifications of Table 8. 1. If it does not meet the specifications,
refer to Item 7 of the Trouble Analysis Table.
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