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3.2.4
Power ON test
3.2.5
Background test
3.2.6
RAM parameter values
9710
The printer always runs a power ON test at transition from power OFF or standby mode to
power ON mode. This test checks as much of the electronics and mechanics as possible
without destroying any document. The test includes RAM and PROM tests and the storage
of mechanical reference values. The test also performs the calibration of opto sensors and
the printhead-to-paper distance.
A program called the Test Task always runs in background, monitoring the printer functions
and collecting status information from other tasks. If a fault occurs, this task transfers fault
information to both the diagnostic panel and the host computer.
The printer memory always contains the current parameter values for the selected type of
document, character font, selected functions, internal status, etc. There are different sets of
parameters for the various printer sub-units or functions. You should already be familiar with
the parameters described in the LB12/LB15 User's Guide .
Most of the above parameters can also be changed from the application program via the
line by the use of the Set Mode (SM) and Reset Mode (RM) commands. In addition, some
parameters can be set and reset only via the line.
All the RAM parameters are separated into three levels based on their use. The method
used to reset a parameter to its default value depends on the level to which the parameter
belongs:
•
Power-ON reset or warm start. All internal status, including error status,
Level 1
non-stored print-out parameters, parameters set with commands
SM/RM >20 and power on calibration values are set to default values or to
new calibrated values.
•
Level 2
RAM reset. Performed manually (see Table 3-1). This level performs the
Level 1 reset but also resets the parameter values and internal status
values set with the SCS command.
•
Level 3
Cold start RAM reset . Performed manually with the cold start function, see
Table 3-1 above. The cold start RAM reset performs the Level 1 and Level
2 reset functions and all the HW offset adjustments made using calibration
function 74. Also the opto sensor values set using the calibration function
70 are set to their default values. Any character generator downloaded
into RAM is cleared. After a Level 3 reset, you must perform the
calibrations using functions 70, 71 and 74. If RAM character generators
are to be included, these must be reloaded, and any functions previously
selected using functions 60 or 61 must be reselected.
LB12/LB15 Field Support Manual
3-9
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