Panasonic JU-455-5 - Azimuth Verification; Index Burst Verification

r
/
r /
1/
1\
r \
'\,
Fig. 9.2
-
1'-. / I'
1\ /
-
A
\
B
\
/ i\ J
V
\
-
V
'\
L-
V
-
Radial Alignment Waveforms (CATS EYE)
A > B
B>A
_l
-A
_ A
-S
)( 100
II lOa
Nota: Sides 0 and 1 a,.. adjusted to agree at the 'actofY . If they disagree, adju" them to meet the specifintions of Table 8.1
• DAD (Dynamic Alignment Diskette) 3.5-inch
(4) Watch the output wave form s for si des 0 and 1. They should appear as shown in Fig. 9.3.
(S) Mea sure the timing levels Al to A4 and 81 to 84 in Fig. 9.3, and calculate the lobe ratio from the following
formulas.
EB
}:A x100%
EA
~ A < EB: EB x 100%
(6) The lobe ratio ulwlated by the above formulas should meet the specifications on item 3 of Table 8.1.
(7) If the above requi rement is not met, loosen the two mount ing screws for the stepper motor, adjust.
(8) Seek from track 0 to track 40 and from track 79 to track 40, and confirm that the adjustment has been completed.
(9) After the rad ial adjustment , be sure to co nf irm track 00 sensor adjustment 9.8 and head (arri age li~iter 9.9.
Note : An alignment instrument for 3.5-inch FOOl permits accurate and easy adjustment because the lobe ratio is displayed on
the instrument.
[J,-------------------------u--
Fig. 9.3 Alignment Waveform (DAD)
- 9 -