73
7. Maintenance and
trouble shooting
In this chapter, instructions are given for the maintenance of the instru-
ments parts that your service department can easily and quickly per-
form. This chapter begins with instructions concerning both instru-
ments; changing the fuses and calibrating temperature sensors. Then,
the chapter is divided into two parts; maintenance instructions for the
separation and control unit, and for the development unit.
Important!
Always disconnect the power when service the
instruments.
At the end of the chapter you will find a reference for the help mes-
sages that appear on the display when you press the ”help/return”
key, or at an alarm condition. You will also find a trouble shooting
guide that refers to the finished gel result.
Fuses
To remove a fuse to check if it has blown, press the fuse holder in with
a screwdriver and turn in counterclockwise. If the fuse blows again,
call for service.
Warning!
For continued protection against fire hazard, replace
fuses only with the same type and rating of fuses (se spare
parts list, section 8.2).
Temperature sensor calibrating
Like other sensing devices, the temperature sensors should be checked
every now and then and recalibrated if necessary. The temperature
sensors are calibrated as follows:
1.
Lift up the lids of the separation and development units and
turn off the system (the separation bed will be 1 to 2°C higher
than ambient temperature when the system is on). Allow the
sensors to equilibrate to ambient temperature (preferably
overnight). Make sure the ambient temperature remains rela-
tively constant.
Alternatively, use a thermocouple to measure the temperature of
the separation bed and development chamber temperature
sensor.
2.
Turn the system on and press ”SEP method file”.
3.
Press ”9”, ”2”, ”0” and ”2” (9202); ignore the wrong-key alarm
when you do this. The display will show:
(9202) CALIBRATE SEP TEMP T = XX°C
<do>
4.
The temperature shown is the previous calibration temperature,
not the ambient temperature. If you want to recalibrate the
temperature sensor press ”CE” to clear the old calibration value
and then enter the current temperature of separation bed.
7. Maintenance and trouble shooting
