Epson LQ-2550 Technical Manual page 216

5.1.1 Diagnostic Tools
The diagnostic tools enable anyone to troubleshoot the electric components, regardless of experience.
5.1.1.1 System Outline
This system has the following features:
Provides anyone with a way to troubleshoot, regardless of technical or electronic expertise.
A choice of programs offers various methods for repair, analysis, and testing of the printer.
Defective units can be identified easily.
Connect this system to an MS-DOS-based computer
cable.
First, install the diagnostic cartridge in the printer and run the diagnostic program with the computer.
The host-computer sends the test programs to the printer, which then executes them. The host computer
receives the test program results back from the printer and determines the status of the printer. Figure
5-3 and Table 5-2 show this diagnostic system.
,
Host
Computer
E P S O N PCIEQUITY)
II
r ---------—
0
I
- - —— - — - - - -
Host Computer
EPSON OX-16
I I
u
7 - - - — — -
- - - — - - — -
25 Pin
S e n d t e s t p r o g r a m
Receive tested program
I
I
I
(a) #E653 with EPSON PC (EQUITY)
interface
25 Pin
Send test program
Receive tested program
- - - - =
I
I
(b) #E654 with EPSON QX-16
Figure 5-3. Printer Diagnostic System
(EPSON QXI 6, PC (EQUITY), etc.) using an RS-232C
- - - — -
r 1
Diagnostic
l - - – - - - - l
r 1
I
cartridge
[
i - - _ - – - i
5 - 4
I
Contains E 6 5 3
1 - - -
Contains E654