Tandon TM100-1 Operating And Service Manual page 45

to the drive. If the check fails, measure the
power supply voltages to ensure they are cor­
rect, or refer to the troubleshooting guide.
1 . Turn off power to the drive.
2 . Connect the interface cable that goes
from the exerciser to the drive.
3 . Apply power to the drive.
4. Verify power supply voltages are within
tolerances.
5 . Ensure a drive select jumper is in place.
6 . Select the drive.
7 . Verify the front panel L.E.D. is
illuminated.
8 . Deselect the drive.
9 . E n su re th e
extinguishes.
5.4 WRITE PROTECT SWITCH
CHECK AND ADJUSTMENT
The write protect switch check and adjustment
establishes the correct operation of the write
protect switch, i.e., the write electronics are dis­
abled when a write protected diskette is used. If
the switch is faulty or cannot be adjusted, refer
to the troubleshooting guide.
WRITE PROTECT SWITCH CHECK
1 . Connect the drive to an exerciser or
computer with a direct monitor of the
write protect output (Jl, Pin 28) or, with
no power to the drive, disconnect Plug 8 ,
and check the continuity with an
ohmmeter.
2 . With a nonwrite protected diskette in­
serted, verify there is continuity between
the two wires of Plug 8 or there is a non­
write protected output to the exerciser,
i.e., a high at Jl, Pin 28.
fro n t panel L.E.D.
3 . With a write protected diskette inserted,
verify there is no continuity between the
two wires of Plug 8 or that there is a
write protect true output to the control­
ler or exerciser, i.e., a low at Jl, Pin 28.
A defective circuit board can be
responsible for a write protect
problem. Test Point 9 should be
high for a write protected disk­
ette, low for a nonwrite protected
diskette.
WRITE PROTECT SWITCH
ADJUSTMENT
1 . Loosen the screws holding it to the brack­
et 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 motor' s speed adjustment
ensures the speed is within the specified toler­
ance. The motor speed tolerance is 300 R.P.M.
1.5 percent. If the motor speed cannot be
±
adjusted, refer to the troubleshooting guide.
DRIVE MOTOR CHECK
1 . Verify power: -I-12 volts D. C. ± 0.6 volt
2 . Apply power to the drive.
3 . Activate the drive motor.
4 . Insert a work diskette.
5-3
NOTE
+ 5 volts D. C. ± 0.25 volt