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EPSON Stylus Pro 7000 Revision B
Operating Principles Summary of Control Circuit Operations 78
2.4.1 Power Supply Board Summary
Depending on the printer model, either 100V AC or 220V AC is supplied to the
printer when the printer is plugged into an live outlet.
When plugged into a live power outlet, the power supply board is working.
To prevent over-current damage to the PS board, the following fuser is
supplied on the PS board.
100V AC
± 10%
= 125V AC/6.3A
The C299MAIN board has three control signals, described in detail in the table
below.
CAUTION
Even after pressing the power switch to turn off the printer,
power is supplied to and from the power supply board. During
the power-down sequence, power is supplied to the CR motor
to move the printheads to the capped position to prevent ink
from clogging the nozzles.
Always turn off the printer using the power switch - do not
remove the power cable from the wall outlet while the printer
is on or while internal parts are moving.
Table 2-7. PS Board Signal Summary
Signal Name Condition Function
+28V/+42V
REM_ON
(MAIN ->PS)
During operation
The On/Off status is controlled from the
C299MAIN board.
Printer off
When this terminal is released (=L), the
28VDC and 42VDC lines drop to 0VDC.
AC_OFF
(MAIN<-PS)
During operation
(= H)
When turned on, the PS board is
enabled and all lines go active. After
that, the “H” signal is sent to the
C299MAIN board.
Printer off
(= L)
When turned off, the PS board is still
enabled, but all lines go inactive. After
that the “L” signal is sent to the
C299MAIN board (this also occurs if the
incoming power drops below the rated
voltage).
POWER_SW
(Panel/MAIN ->
PS)
Turning on
This terminal closes and the PS board is
activated.
Turning off
This terminal releases and remains
active anywhere from10+ seconds to
several minutes.