Epson EPL-5700I, Service Manual

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EPL-5700L/5700i Revision A
OPERATING PRINCIPLES ELECTRIC CIRCUIT 22
2.2 ELECTRIC CIRCUIT
S in ce th e E le c tric C ircu it o f th is p rin te r is b a s ic a lly th e sa m e a s th a t o f E P L -
5 7 0 0 , th is s e ctio n e xp la in s o n ly a b o u t th e M a in C o n tro l B o a rd a n d its
re la te d p a rts.
2.2.1 Operating Principles of Controller
T h e C 2 9 2 M a in B o a rd , w h ich fu n c tio n s a s a co n tro lle r o f th e p rin te r,
co n sis ts o f th e M a in C o n tro lle r a n d th e E n g in e C o n tro lle r.
Figure 2-1. C292 Main Board
T h e M a in C o n tro lle r p ro ce sse s p rin t d a ta se n t fro m th e h o s t co m p u te r a n d
g e n e ra te s vid e o sig n a l.
T h e E n g in e C o n tro lle r re ce ive s vid e o sig n a l fro m th e M a in C o n tro lle r a n d
d riv e s th e e n g in e to p rin t.
FUNCTIONS OF THE MAIN CONTROLLER
C o m m u n ic a tio n w ith th e h o s t co m p u te r (re c e iv in g p rin t d a ta a n d
se n d in g sta tu s ).
P ro ce ssin g th e p rin t d a ta (a n a lyzin g c o m m a n d a n d g e n e ra tin g v id e o
sig n a l).
S e n d in g th e v id e o sig n a l to th e E n g in e C o n tro lle r.
M o n ito rin g p a n e l o r s w itch co n d itio n s .
FUNCTIONS OF THE ENGINE CONTROLLER
R e ce ivin g th e vid e o sig n a l a n d se n d in g e n g in e sta tu s .
M o n ito rin g s e n s o rs.
C o n tro llin g th e o p tio n a l lo w e r ca s se tte .
B lo c k d ia g ra m o f th e C 2 9 2 M a in B o a rd a n d fu n c tio n o f e a ch d e v ice a re
sh o w n o n th e fo llo w in g p a g e .
RAM
SIM
M
(CN1
)
DRAM
JP1
ROM
CPU
Video (CN3)
CPU
SLC
TUSB
1284DRIVER
USB I/F
Parallel I/F
Engine Controller
Main Controller