Brother International MFC-7050C Service Manual - Page 30

Brother International MFC-7050C Manual

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3.6 Interface PCB This PCB interfaces the main PCB and the externally connected computer with each other. The interface PCB also generates +22V and +11.75V supplies from the +30V source and +3.3V supply from the +5V source, and then feeds them to the main PCB. The +22V and +11.75V sources are stabilized and fed to the thermal ink-jet print heads embedded in the ink cartridges and the head driver IC on the main PCB. The +3.3V source is stabilized and fed to the ASIC and MODEM on the main PCB. As shown below, the +22V source may be turned on or off by control signals issued from the main PCB. Interface PCB Centronics I/F connector Main PCB +30V O +5V O 22V regulation circuit 11.75V regulation circuit 3.3V regulation circuit Interface Circuit O +30V < 22V control signal O +22V O +11.75V O +5V O +3.3V Ill - 19

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3.6
Interface
PCB
This
PCB
interfaces
the
main
PCB
and
the
externally
connected
computer
with
each
other.
The
interface
PCB
also
generates
+22V
and
+11.75V
supplies
from
the
+30V
source
and
+3.3V
supply
from
the
+5V
source,
and
then
feeds
them
to
the
main
PCB.
The
+22V
and
+11.75V
sources
are
stabilized
and
fed
to
the
thermal
ink
-jet
print
heads
embedded
in
the
ink
cartridges
and
the
head
driver
IC
on
the
main
PCB.
The
+3.3V
source
is
stabilized
and
fed
to
the
ASIC
and
MODEM
on
the
main
PCB.
As
shown
below,
the
+22V
source
may
be
turned
on
or
off
by
control
signals
issued
from
the
main
PCB.
Interface
PCB
Main
PCB
Centronics
I/F
connector
+30V
O
+5V
O
22V
regulation
circuit
11.75V
regulation
circuit
3.3V
regulation
circuit
Interface
Circuit
Ill
-
19
O
+30V
<
22V
control
signal
O
+22V
O
+11.75V
O
+5V
O
+3.3V