Y-E Data YD-380 - Page 12

4.2.3 Adjustment
1. Loosen the Index Sensor screws one quarter turn.
2. Power up the drive.
3. Connect an oscilloscope to the PWB test points lA, 1B, 3.
Connect channell to PWB TP lA, channel 2 to TP IB, and
connect the external scope trigger to TP3.
Set the oscilloscope controls as follows:
INPUT COUPLING MODE
AC
VERT MODE
ADD
INVERT (CH 2)
ON
TIME/DIV
0.1
ms
VOLTS/DIV
(CHI, CH2)
100
mV
4. Insert a CE Disk and turn the front lever to lock position.
5. Load the read/write heads against the disk and step t~e
head/carriage assembly to track 2. Adjust the sensor posi-
tion until the timing between the start of the sweep (index
signal from TP3) and the first part of the index burst (TP
lA, TP lB) is within -600 to 1400 ~s.
,.... ., , .. 1 _
Index Signal (TP3)--------~
-600 to 1400~s
Burst Signal
(TP1A,TP1B)
J
Figure 4.2.3
Note: To delay the Ind~x Burst, move the sensor towards the
front bezel (see Page 9, figure 4.2.1).