Power Supply Board Summary - Epson Stylus PRO Color Large Format Inkjet Printer 7000 Service Manual

EPSON Stylus Pro 7000

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.
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.
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.
Operating Principles
Signal Name
+28V/+42V
REM_ON
(MAIN ->PS)
AC_OFF
(MAIN<-PS)
POWER_SW
(Panel/MAIN ->
PS)
Summary of Control Circuit Operations
Table 2-7. PS Board Signal Summary
Condition
The On/Off status is controlled from the
During operation
C299MAIN board.
When this terminal is released (=L), the
Printer off
28VDC and 42VDC lines drop to 0VDC.
When turned on, the PS board is
During operation enabled and all lines go active. After
(= H) that, the "H" signal is sent to the
C299MAIN board.
When turned off, the PS board is still
enabled, but all lines go inactive. After
Printer off that the "L" signal is sent to the
(= L) C299MAIN board (this also occurs if the
incoming power drops below the rated
voltage).
This terminal closes and the PS board is
Turning on
activated.
This terminal releases and remains
Turning off active anywhere from10+ seconds to
several minutes.
Revision B
Function
78