Tuttnauer 3850 ELVG-D, Technician Manual, Page: 13 / 67

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6.19 Back-up memory does not function does not function, new parameters
are not stored in memory
♦
The backup battery in the Real Time Clock is damaged so
component U2 should be replaced.
6.20 LOW PRESSURE message is displayed
This is usually due to insufficient water inside the chamber.
♦
If the water valve is OK, the electrode detecting the water level may
be damaged. It may detect water in the chamber although it is
actually empty.
♦
The normal operation procedure of the electrode is to let water in
the chamber 8 additional seconds after it has detected a sufficient
water level.
♦
If the electrode is short circuited, it may let water into the chamber
for only a few seconds.
♦
Check if there is any contact between the electrode and the
chamber. Use an ohmmeter for that purpose. Make sure none of the
tools to be sterilized has any contact with the electrode. If the
problem persists, the electrode circuit on the AJUNC3 board may
be short circuited or damaged.
6.21 Clock and date are inaccurate, new data is not stored in memory
♦
If new data (operator’s own parameters) is not kept in memory, then
the backup battery is down, and the same unit has to be replaced as
the backup battery is an integral part of the Real Time Clock.
Change the Real Time Clock (U2), on PREDG.
♦
The battery manufacturer offers a ten-year guarantee, but it is
recommended to change the Real Time Clock including the
integrated backup battery once every 8 years.
6.22 Unpredicted function of the autoclave
♦
Check the input and output voltages. Disconnect the printer as it
may be causing a short circuit if it is faulty. If the problem persists,
the keypad may be short circuited, replace it with the PREDG
board, if that does not help, replace the complete electronic system.
6.23 Displaying of low temperature
If LOW TEMPERATURE is displayed, the following should be
checked:
1. The proper amount of water is in the chamber.
2. The air jet has to be checked and cleaned.