Epson 7000 Power Supply Board Summary, PS Board Signal Summary, Signal Name Condition Function

EPSON Stylus Pro 7000 Revision B

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,

C A U T I O N

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.

Table 2-7. PS Board Signal Summary

Signal Name	Condition	Function
+28V/+42V	During operation	The On/Off status is controlled from the
		C299MAIN board.
REM_ON
		When this terminal is released (=L), the
(MAIN ->PS)	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.
AC_OFF
		When turned off, the PS board is still
(MAIN<-PS)
		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).
	Turning on	This terminal closes and the PS board is
POWER_SW		activated.
(Panel/MAIN ->
		This terminal releases and remains
PS)
	Turning off	active anywhere from10+ seconds to
		several minutes.

Operating Principles Summary of Control Circuit Operations 78