HP LaserJet II Serie Manual De Instrucciones página 109

HP 33440/HP 33449 COMBINED SERVICE MANUAL
5-6. POWER
DISTRIBUTION
Power distribution is illustrated in Fi~re 5-19. When the ON/OFF switch is set to ON, AC
voltage is supplied to the DC Power Supply Assembly via the AC Power Module. Fuse F1 protecti
the DC Power Supply Assembly from current surges. The DC Power Supply provides the following
voltages:
+5 Vdc and -5 Vdc
+ 24A Vdc and + 24B Vdc
The ~SET signal generated by the DC Power Supply Assembly results from any of the following
conditions:
When the power is initially switched ON.
When the +5 Vdc power falls below the required level.
When AC power is momentarily interrupted.
The +5 Vdc power supply is the first supply enabled and is the only voltage level required to
'ti~e up" the main microprocessor on the DC Controller PCA. After the processor initializes
itself, the processor generates the ~MOTE signal which enables the +24 Vdc regulators.
——— —_ ——_—
F-
'--::w
~– ——————————————
DC POWER mPPLY/MAIN MOTOR DRIVER MODULE
J50z
FILTERING,RKTIFICATlON a REGULATION
3 - . . .. A.....
5A ~:;:Ry::K;
+24". ,J- ~.. .
1
y ~+'4'4 ;iii<:{~~~
L_– IIZ 1'14 '~6
54327
J LLJJ
Ill,
1,,. 76
543, ,]
I
J
.PTPPRL ; .:"=,. ,
SENSOR
:
sENSOR
I
Figure 5-19. Dc
Power
Distribution
5-21