Panasonic JB-3300 Technical Manual page 367

A>sB x 100
x 100
B>A
joer
Fig. 9.2 Radial Alignment Waveforms (CATS EYE)
Note: Sides 0 and 1 are adjusted to agree at the factory . If they disagree, adjust them to meet the specifications of Table 8.1
@ DAD (Dynamic Alignment Diskette) 3.5-inch
(4)
(5)
(6)
(7)
(8)
(9)
Watch the output waveforms for sides 0 and 1. They should appear as shown in Fig. 9.3.
Measure the timing levels Al to A4 and B1 to B4 in Fig. 9.3, and calculate the lobe ratio from the following
formulas.
. 2B Q . ZA 0
D>A>2B : SA x 100% a> A<ZB: >B x 100%
The lobe ratio calculated by the above formulas should meet the specifications on item 3 of Table 8.1.
If the above requirement is not met, loosen the two mounting screws for the stepper motor, adjust.
Seek from track 0 to track 40 and from track 79 to track 40, and confirm that the adjustment has been completed.
After the radial adjustment, be sure to confirm track 00 sensor adjustment 9.8 and head carriage limiter 9.9.
Note: An alignment instrument for 3.5-inch FDDs permits accurate and easy adjustment because the lobe ratio is displayed on
the instrument.
U U
Index Azimuth . :
burst waveforms Radial alignment waveforms
waveform A
| f \
A, B;
~
B, ry : rn
n r 5 Pm
Aa
Pr AJ i a r nN
os
B,
r ry
A;
ry B,
ha had
yo ee yy Me i
LJ kd
~ be
M - . ~ _ bad bad We - "~~
20ms
7Oms
120ms
170ms
Fig. 9.3 Alignment Waveform (DAD)