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REV.-A
The voltage drop at R49 is given at the minus terminal of the compartor in the OCU for comparison
with the reference voltage provided to the plus terminal.
Compartor output will work for current chopping at the motor pre-driven circuit in the OCU. The current
level detected at R49 and then cut off is set at approximately 2.5A by Resistor R77. Wave forms are
shown in Figure 2-54.
+
24
PNP10---I
Vx
R77
NPN2o---t
Motor
Pre-driver
0.56 V
R49 0.22 3W
PNP2
NPN1
Upper: CM
+
(06 cathode)
Lower: CM - (07 cathode)
Figure 2-53 Carriage Motor Drive Circuit
--
-
I
..
1 -
~J
~
~.
1' -\
J
I\,..
~.
~,
4
Cl
,...
...
!--"I
r-
..,
~
~
1:1
--.I
If
~
lJ
~
f
20
I
•
0\1
0·2 ms 0·2 ms
Figure 2-54 Carriage Motor Current Wave Forms
2-50
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