HP LaserJet 4L - Page 115

Functional Overview
DC Controller/Power System
Power
supply Main switch
r ---,
SW201
I
*1
[4P/4MPOnly)
II
----
~ Fuse
Y
(FU201)
2
NoW
filter
a
Regula!or
Overvoltage/
Iovercurrent
detection
circuit
Mm,
f+12bV
o
+12V
power
supply
circuil
I
n
Mainmotor
sub supply
oower circuii
1
Door switch
...........
SW201
: H]gh- :
-k” : “
T, +12av 1 uOlta9e\
;
power ;
k+ 1 ‘ ‘up’”:
:
circult ,
...... . ....
!-
...........
~ Main
: momr
----.-i dflve
; drcuit
+12a V
K
+5V
I
-----w
F---
e
m
morvionmginput ~-SW
D
Fusing
Heeter
c1
12b V=Voltage
before switch
12aV=Voltage
after switch,
o
Main
Motor
d Solanoid I
m
‘El
VH301
Fanmotor
+5!!!!
E
Formetter
PCA
Figure 5.4
Power Supply Block Diagram
5-9