Citizen Systems iDP-3551, iDP-3550 user manual Sel Sw ?, Off, Yes

Dump Mode	When the power is turned on while the LF and SEL switches are pressed, the
	printer enters dump mode and prints the following message.
	“=== Hexadecimal Dump ===”

Power-on
				•SEL/ERROR lamp				blinks at
		ON			intervals of 0.25 sec.
SEL SW ?					•Buzzer sounds for 1 sec.
					The message		"Clear Data
	OFF				in Buffer" is printed in
					enlarged	red	characters.
			YES
					Then, 5	lines	are	rapidly
		Buffer Data			fed.
			NO

YES

1 sec. passed

The input buffer is cleared and

NO

the message “Cleared Input

Buffer” is printed. Then, 5

OFF

lines are rapidly fed.

SEL SW ?

SEL/ERROR lamp lights up.

ON

The message "Power Down (Data

in Buffer)" is printed in red,

NO

followed byBuffther contentsData of the

buffer. After printing, SEL/ ERROR lamp lights YESup.

Waits for data input