Total corrozion in all blocks.
BAD DATA of M48T35.
Programming SRAM.
For simulation connect resistor 8k to sensor plug.
Indication must be 17.7 - 18.0 ppm
Internal PS faulted.
100uF 35V, 4700uf 35V.
Repair of sensor cable and LCD cable.
Indication must be AUTO
Calibrator - resistor 320R / 500ppm
Alarm_1>100ppm
Alarm_2>130ppm