Y-E Data YD-380 - Page 32

2.
Set up a dual
trace oscilloscope.
Connect channel
I to
PWB test. point lAo
channel
.
Connect
2 to
PWB test point
lB.
Connect
scope ground
to PWB test point G
(GND).
Connect the external scope trigger probe to PWB test
point 3.
Set the oscilloscope controls as follows:
COUPLING MODE
AC
VERT MODE
ADD
INVERT (CH 2)
ON
TIME/DIV
20
ms
VOLTS/DIV (CH 1, CH 2)
20 mV
3. Insert a CE disk and power up the drive.
4. Seek the carriage 32 steps inwards.
s. Load the read/write heads against the disk. Insert a'
screwdriver through the notch in the PWB (figure 4.14.3)
and move the. stepper in or out to obtain the position
signal shown in figure 4.14.1.
Note: For this adjustment, tighten the stepper attachment
screws and then loosen 1/4 turn.
Screw .for
Position
Adjustment
Stepper
Figure 4.14.3
Screw for
Position
Adjustment