Horiba Scientific LAQUAtwin B-771 Instruction Manual page 61

Question
The power is not
turned ON.
Er1 is displayed
right after power
ON.
Er2 is displayed
right after power
ON.
Er3 is displayed
right after power
ON.
How can I return all
the settings of the
special setting mode
to the default
settings?
Check that the batteries are inserted properly. If the batteries
are low, replace them both with new ones at the same time.
The internal IC in the meter may defect.
After Er1 is displayed, the meter enters the initialization mode
automatically and Init and
over 2 seconds to execute initialization, and then turn OFF and
ON again (refer to page 19).
If Er1 is still displayed after the initialization, the internal IC in
the meter defects. Replace the product with new one (the
meter cannot be repaired).
The internal IC in the meter defects. Replace the product with
new one (the meter cannot be repaired).
The internal IC in the meter defects. Replace the product with
new one (the meter cannot be repaired).
Perform initialization (refer to page 19).
Answer
appear. Press the CAL switch for
21