Tuttnauer EA - Page 38

15 TEMPERATURE DISPLAY IS INCORRECT
e Check the temperature sensor PT 100.
e Check the calibration of the temperature circuit.
16. ADD WATER (to reservoir) INDICATOR IS ALWAYS ON
e Check the connector at JP2 on AJUNC3 board.
e Check if the float at the water reservoir 1s stuck.
e Check the input: TP1 and TP8 FULL = 0.0V
EMPTY = 5.0V
e Check the float’s buffer, it may be, the input at U5 on PREDG is damaged. If so, the
PREDG should be replaced.
17. DOOR CLOSED INDICATOR IS ALWAYS ON/OFF
e Check and fine tune the switch at the upper front left side of the autoclave, while the
door is open. Check the switch with an Ohm- meter. If the microswitch is damaged,
replace it .
e Check the LED, if it is burnt, change the PREDG and keypad.
e Check the connector between microswitch and AJUNC3 on TP2.
e Check the connection on GND to the microswitch with an Ohm-meter and be sure that
the GND to the micro switch.
e If the switch and microswitch are OK, buffer at U5on PREDG may be damaged, in
that case, replace the PREDG board.
Note : If replacing the microswitch is necessary, MAKE SURE TO DO SO
个 ONLY WHEN THE ELECTRIC CORD IS DISCONNECTED.
18. START KEY DOES NOT LET WATER INTO THE CHAMBER
e Follow previous procedures for float, controls and valve.
e Check the water level electrode: Connect TP1 and TP6,close the door, press START ©
e If 4v the electrode is short circuited or faulty. Same procedure may be followed without
pressing START, if the door is open.
19. BACKUP MEMORY DOES NOT FUNCTION, NEW PARAMETERS ARE NOT
STORED IN MEMORY
e The backup battery in the Real Time Clock is damaged so component U2
should be replaced.
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