Jenway 3540 User Manual
Page 70
8.3
Troubleshooting - pH
Fault
Possible Cause
Action
No display
Check power supply
Check that correct 9V ac
power supply is connected and switched
on
Erratic display
Check power supply
The 3540 must be used with the
supplied 9V ac power supply
The 3540 will not operate with other
power supply units
Drifting, erratic
Electrode fault
Use BNC shorting plug to test the
readings
3540 (refer Section 8.5)
Replace electrode
Unable to calibrate
Electrode fault
Use BNC shorting plug to test the
3540 (refer Section 8.5)
Replace electrode
ERROR EO ...
Buffer problem
Use freshly prepared buffers
ERROR SLOPE ...
Electrode problem
Use BNC shorting plug to test the
3540 (refer Section 8.5)
Replace electrode
Unable to
Using correct buffer
Is the buffer type correct?
recognise buffers
set
Use AUTO for Jenway supplied
buffers.
Replace buffers
Use BNC shorting plug to test 3540
(refer Section 8.5)
Replace electrode
Temperature
Temperature probe
Check 3540 using Section xx.x
readings
faulty
Replace
temperature
fluctuating
probe
Temperature
Temperature probe
Check 3540 using Section xx.x
readings
faulty
Replace
temperature
incorrect
probe
Manual temperature
Set meter to read °C and set the
not
set
temperature
against
a
calibrated
thermometer
Will not print
IrDA connection broken
Line up units or use the supplied
RS232
connector
Paper out
The feed light on the printer will
flash
if
the
unit
requires
paper
Battery
flat
Connect
ac
power
supply