6. SERVICE OPERATION
6.1. Opening the instrument
On the right side and the rear side of both instruments there is a side door, which allows
reaching of the fluidic system and the mechanical parts. Other parts of the analyzer (electronic
parts, etc.) can be reached by opening the front and rear covers.
How to take off the rear cover:
First unscrew the 5 cover fixing screws located on the rear panel, 2 screws on the upper side
and 3 screws on the vertical side. After this, pull the cover backwards a few centimeters to
release sliding locks, and then you can turn it upwards to take it off completely. In this way you
will be able to reach the electronics: COMB and PPB. Do not forget that you can take them off
only if you take off IDEPROM Card first.
How to take off the front cover:
First unscrew the 2 screws located on right and left part of the upper side and the 3 screws
located on the bottom side. After this, pull the cover towards you to take it off.
6.2. MDA (Monochrome Display Adapter) emulation mode
MDA emulation mode was developed to help the manufacturer and Service Personnel in the
checking phase of the instruments. This mode is available during the total operation but
especially useful for checking the BIOS setup and OS functions. This mode should be handled
the same as the service menu, the user does not have to know these options.
At power-on, the controller PIC display module displays the greeting screen. After 6 seconds, it
starts to scan the keypad and behaves like an MDA adapter to the PC, although the displayed
screen is still holding the greeting screen.
If you switch to MDA emulation mode, the system boot events can be displayed, and the
CMOS SETUP program can be started, if necessary.
If the main program will not start in 90 seconds, the PIC will automatically switch to MDA
displaying mode to give information about the reason of hang-up. This can be some CMOS
failure, if the motherboard settings are lost for some reason, and the system is waiting for user
confirmation: F1 on external keyboard, or running setup - both require external keyboard to be
connected.
Hold the „i” button, and press and release the „.” button on the foil keyboard of the analyzer to
activate the MDA mode, which uses the LCD like a primary computer monitor (80 characters by
25 rows).
6.3. Checking the BIOS setup
It is suggested to check it if the instrument hangs after switching on, or software does not start
(or cannot be upgraded from floppy disk).
Connect an external keyboard (US layout) to the instrument and switch it on
Press F2 repeatedly until the instrument beeps.
Switch the instrument to MDA emulation mode (by pressing "i." on the keypad)
Check the key points listed above (or from the enclosed Main Board Manual), if you find
differences, set these settings
Go to the Exit menu (upper right quarter of the display) and select Exit Saving Changes.
Confirm this by selecting Yes in the pop up window.
The instrument will restart with the new (correct) BIOS setup configurations
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