HP 250C - Manual (Page 186)

230
250C
Service
Monitor
ALT
330
350C
Service
Monitor
8Ć52 Troubleshooting C4699Ć90000
Service Monitor (Data Display)
The service monitor is useful to find out why the plotter is not plotting what you expect it to
plot. It enables you to read the graphicsĆlanguage instructions that the plotter is receiving
from the computer. Instead of plotting the drawing that you send, the plotter prints the
beginning and end of the code that would otherwise have been used to plot the drawing.
You need a basic knowledgeof thegraphicsĆlanguageinstructions to beableto pick out the
important information from the printed code. (Basic training is included in the course
referenced on page ii.)
1 In service mode 2, load a sheet of media (A3 size or B size minimum)
in portrait orientation.
2 To enter service monitor:
Hold down the
ALT
key and press
Service Monitor
(The frontĆpanel LEDsdo not change.)
Press
Service Monitor
(The frontĆpanel LEDsdo not change.)
3 Send thefilefrom thecomputer through theserial or parallel ports.
The
Ready
LED beginsto flash.
4 Wait until thecomputer has indicated that it has sent the file.
The
Ready
LED continuesto flash.
5 Whilethe
Ready
LED is flashing, hold down the
ALT
key and press
Service Monitor
again.
The
Ready
LED continuesto flash. After a minute, the fan turnson, and the carriage
movesto the right side of the plotter.
Instead of plotting the drawings that you sent, the plotter plots the first and last
Kbytes of the code for those drawings. The code is printed in hexadecimal and ASCII
format. (If the total size of the file(s) sent is not bigger than one Kbyte, only the first
buffer is printed.) The plotter exits the service monitor mode if the file(s) sent contain
PJL universal exit language.