HP LaserJet II Serie Manual De Instrucciones página 91

HP 33440/HP 33449 COMBINED SERVICE MANUAL
5"f. INTRODUCTION
This fnnctiond overview of the HP 33440 and HP 33449 printers is designed to provide the service
representative with a general understanding of the processes which occur during printing. The
diagram below (Fi~re 5-1) groups the four basic functional blocks discussed in this chapte~
Section 5-2: Image Formation System.
H Section 5-3: Paper Pickup/Feed System.
Section 5-4: Machine Control System (DC Controller PCA).
Section 5-5: Interface System.
Section 5-6: Power Distribution.
For additiond details about how the printers function in various operational situations, refer also
to Chapter 7, "Troubleshooting."
To external device (host computer, etc)
t
j
~————— ——— ———— ——— —————— ____ __
I SYSTEM INTERFACE
1
I
Interface PCB
1;
1
l—
1 ,
I
Wdeo controller PCS
1!
Ill
L–—____—–––––––_ –––– —___q_____j
L
1
Face up trav
~––/––––
————— -————————
1
~_—————
_L—–_— —–– _
[~
DeliverV
PICK-UP/FEED CONTROL SYSTEM 1
SYSTEM
;/
:t~ '4
/
rollers 1-
1
1/
h
DC controller PCB
1/
Face down trav
II
~————— —————————
–––____;~L––––
J
—— __— ——— ——— _ J
1/ ~/
A
I
~—— —— __ ij
_—— _ ———
IMAGE FORMATION
1
/ SYSTEM
I
!! Mirror ~--------- -
Smnning mirror
I
t
I
1 I
Transfer
and
separation
unit
I
——— ——— —-———— ——————— ———
J
———— —————— ——————— ————
1
u—
d ~~
u)
Cassette
I
~ Fixing assemblv
I
———— —————————— ———
———— ——— ——— —————— —— J
Figure 5-1.
Diagram of Functional Blocks for HP
33440
and HP
33449 Printers
5-3