2.
Troubleshooting
1
Unit does not turn on
Check mains cable
Check fuses
Check cable connections
Problem on power board
Problem on display board
Problem on main board
2
Balance is weighing but is
unstable
Mechanical damage
Pan rubbing against case or not installed correctly
Air drafts or vibration or unstable table
Not good parameters for the working conditions
Dirt inside the measurement system or inside the coil
3
No zero point after
turning on the balance
Pan needs to zero
Mechanical damage
4 Balance
shows
wrong
weight
Wrong calibration
Mechanical damage to weighing mechanism
Pan not installed correctly
Off center load error
Dirt inside the measurement system
5
Off center load error
Check if the horizontal stat is being
kept mechanical damage
6
Intense creeping (drift)
Mechanical damage
Dirt inside the measurement system
7
Linearity error
Linearity correction
Mechanical damage
9 No
communication
between balance and PC
Wrong parameter
Check connection RS-232 to PC
Wrong interface cable
10
Time and date does not
work
Check voltage TTL 2 Hz (0/+5V DC on measuring point
SQW
Problem on main board
Batteries are damaged
11
Display shows program
number, no function
Quartz does not work
Processor damage
Check tension
RST
(reset)
“1”
+5V and exchange main board
when RST does not work
12
Outside maximum range
Mechanical damage
Check voltage on measuring resistor
13
Balance works OK but
drying is not correct
Check parameters and mode selected
Check samples are not hitting the temp. sensor
Check temperature of chamber
Check lamps
14 Temperature
of
chamber
is incorrect
Recalibrate temperature sensor
Temperature sensor damaged
Lamp circuits damaged
15
Heating lamps will not
turn on at any time
Check lamps
Check wiring of lamps
Temperature sensor
16
Lamps will not turn off
Damaged temp. sensor
Recalibrate temp. sensor
Lamp control circuits damaged
4
MLS…N-SH-e-0812