Tuttnauer EA - Page 37

Il HEATERS ARE ALWAYS OFF or ON
WARNING : IF YOU NEED TO TIGHTEN A SCREW, MAKE SURE TO DO SO
ONLY WHEN POWER CORD IS DISCONNECTED.
Check the heaters connections.
e Check the cutoff thermostat position and turn it clockwise to the end .
e Check the control at TP1 and TP12 for ON = 0.0V OFF = Sv
e Check connections between AJUNC3 to SSR at TP4.
Does AC voltage enter the SSR at AC connector (page 75) and SSR pin 2.
e Is SSR output the AC voltage ? Check AC connector (page 75) and at
the SSR pin 1.
e Is the control OK? Check the SSR for 5.0v between pins 3&4 . If control is OK,
but SSR output is not the AC voltage, - replace the SSR.
12 HEATERS OK BUT AUTOCLAVE DOES NOT REACH STERILIZATION
TEMPERATURE
e Check and calibrate the cutoff position.
e Check and clean/ replace leakage at the exhaust valve.
e It is also possible that there is a calibration variance, check the GAIN pressure
calibration, perhaps it should be lowered or, the GAIN temperature should be
increased.(Please refer to the calibration paragraph...)
e Another possibility is that insufficient water level in the chamber does not allow the
pressure to build up. Check the water level detector electrode, or the leveling of
the autoclave.
13 FAN IS NOT ON DURING THE CYCLE
e Check and connect properly the FAN'S connector at JP5 on the AJUNC3 board.
e Disconnect FAN and check the control TP1 and TP-13:
ON = 0.0V OFF = 5.0V
14. PRESSURE DISPLAY IS INCORRECT (DISCREPANCY BETWEEN ANALOG
AND DIGITAL DISPLAYS)
e Re-calibrate the displayed pressure by manipulating POT2 on the AJUNC3 board.
e Check the MPX2200A pressure transducer between TP2 & TP3:
Working condition = 20mV for 100 kPa.
e If pressure transducer is faulty, replace it, and calibrate it according to the calibration
instructions on page 48.
e If the pressure transducer is OK but display incorrect, replace the AJUNC3.