AVL AVL DiCom 4000, Service Manual

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Evaluation Unit AVL 4000
4-14 Service Manual
4.5.2 External A4 Printer (Option)
An external A4 printer can be connected via a standard Centronics interface. When an
external printer is on-line, all outputs (hardcopy, results printout) are diverted to that
printer. The time required for printing depends very much on the printer’s buffer.
A standard Centronics cable is used for the printer (AVL identification no. EX0308).
4.6 LCD
The 320
×
240 display is controlled by a separate controller.
The display contrast can be adjusted in the Service menu.
4.7 Membrane Keypad
The integral membrane keypad contains the 6 softkeys and 2 permanent keys. The
softkeys are used by the operator to control the program run or menu selections.
Rarely needed data (e.g. garage address, vehicle data etc.) can be input using the editor
which is also implemented by the softkeys. If more frequent input is required (e.g. data
input for country-specific variants), the external PC keyboard option should be used.
The software supports an external PC keyboard (connected to the 5-pin standard PC
keyboard interface). Function keys
F1
to
F6
have a parallel function with the softkeys.
When the instrument is powered up, the external keyboard is initialised during the self-
test.
In the Service menu (User data/Languages) it is possible (depending on the software
version) to select the keyboard layout after selecting the language for the menu
prompting.
If a different keyboard layout is selected, the instrument is re-started and the keyboard re-
initialised during the self-test. After the re-start, the instrument is immediately ready for
measurements – you do not have to wait for the 4-/5-gas measuring instruments unit to
warm up.
4.8 Fan
The axial fan is screwed onto the rear panel with 4 M4
×
25 cheese-head screws.
The instrument is ventilated at the bottom and also at the rear to keep the pneumatic
pump cool. The angle of the air flow near the display has been kept as small as possible to
prevent the screen from becoming dirty too quickly.
The fan speed depends on the temperature.