Figure 1-8. Self-Test; Figure 1-9. Hexadecimal Dump; Operating Instructions; Hexadecimal Dump Function - Epson LQ-870 Service Manual

REV.-A

1.6 OPERATING INSTRUCTIONS

This section describes the self-test, hexadecimal dump function, error states, printer initialization, and
buzzer operation.
1.6.1 Self-Test
To run the self-test in draft mode, turn on the printer while pressing the LOAD/EJECT button. To run
the self-test in LQ mode, turn on the printer while pressing the LINE FEED/FORM FEED button. You can
press the PAUSE button to stop or start the self test.
When you are satisfied with the self test, press the PAUSE button to stop it and then turn off the printer.
The firmware revision number is printed on the first line of the self-test, followed by the current DIP
switch settings.
xxxxxx
Country/PC
U.S.A.
F r a n c e
Germany
4 3 7

1.6.2 Hexadecimal Dump Function

To enter hexadecimal dump mode, turn on the printer while pressing both the LOAD/EJECT and the
LINE FEED/FORM FEED buttons. In hexadecimal dump mode, the printer prints the hexadecimal
representation of the input data along with the corresponding ASCII characters. This function is useful
for checking the data the printer receives from the host. If input data is a control code instead of a
character code, a period (.) is printed in the ASCII
column.
4 0
2 0 2 0
7 0 6 C 65
7 5 6 D
7 3
2 0
on on on
on on o f f o f f
0 n
o f f o n
o f f o f t o f f
on on
o t t o f t
on
on

Figure 1-8. Self-Test

5 2 0 0 7 4 0 1
5 4 6 8 6 9 7 3 2 0 6 9 7 3
2 0 6 6 2 0 61
7 0 2 0 7 0 7 2 6 9 6 E 7 4 6 F
2 0 6 6 6 5 6 1 7 4 7 5 7 2 6 5
2 0 2 0 2 0 2 0 6 9 7 4

Figure 1-9. Hexadecimal Dump

H i g h s p e e d d r a f t SWl-6
o f f V a l i d '
Invalid
R e c e i v e
o f f
V a l i d
o f f
1 i n c h s k i p
Invalid
i
3 6 1 8 7 0 0 0
2 0 6 1 6 E 2 0 6 5 7 8 6 1
2 0 6 4 7 4 6 1 2 0 6 4
7.5 7 4 2 E 2 0 5 4 6 8
2 0 6 D 6 1 6 8 6 5 7 3
7 3 7 9 2 0 6 6 6F
1-20
ot i
on
b u f f e r
o f f
0 1. 1
o f f
o f f o f f
T h i s i s a n
m p l e o f a d a t a d
p r i n t o u t . T h
i s f e a t u r e m a k e s
i t e a s y fo
.