Fujitsu M255XK Customer Engineering Manual page 25

WRIIE GAIE input signal
(lDterDal) WRITE GATE
Erase gate
sigaal
SIDE ONE SELECI
WRItE DAtA input sigDal
Data latch output
Write driver outplt
Hagoatization of disk
--, i
J;J/7~~:=I//J/////#ql/jt-----+-r-
Erase off delay
. Wrlte
driver area of
operatlOD . .
iw»n»»,""",""
b»»m;m;mmm%VZ1
_ _ -JV///'
Erase driver area of operation
'///.11..-
- . - - - - - - - + - - - - - - - , -
- - . 1 . - - - - - - - - I I - - - - - - - - - - - - L -
%I-I-I~I-I-I-I-t3-1-~
Previous -.petization
Figure 3-5 Typical Write Circuit Waveforms
Low Voltage Detection circuits are provided to sense low and unstable DC
voltages. The output of the low voltage detection circuits prevent the disk drive
from writing (or erasing) if the supplied voltage (+5 or +12 VDC) is low or
unstable.
These low voltage detection circuits are activated as follows:
+5 VDC circuit will activate if +5 VDC is at 3.6 to 4.0 volts.
+12 VDC circuit will activate if +12 VDC is at 9.2 to 8.2 volts.
TS-021-013087 ••• 01 3-7