NAVI D-25 Instruction Manual page 168

● ERR No. 01 Memory error
● ERR No. 02 Battery voltage low
D-52/53/54/55
Explanation
Data cannot be read from or written to the internal
memory.
Cause
The pH meter
does not start
operating cor-
rectly even after
the power is
turned ON.
The internal IC
is defective.
Explanation
The battery has insufficient voltage.
Cause
The battery
voltage is low.
(Battery voltage:
2.2V or less)
The measured value cannot be guaranteed when ERR
No. 02 is displayed.
6 Maintenance and Troubleshooting
How to solve problem
Take the battery from the pH meter,
and disconnect the AC adapter.
Then press the ON/OFF key for
about 10 seconds.
Seek repairs at your nearest retail
outlet or HORIBA service station.
How to solve problem
Replace the dry-cell battery.
6.5 Troubleshooting
157