Service Manual DS 85
© Hirschmann Rev.G 10/05/15 190166_G.DOCXG
E64
In case of an E64, the CU is reporting no signal from the CAN-Bus converter board in the angle
sensor box. Start by checking your cabling between pressure transducer and cable reel. You can
verify that power is being supplied to the sensor by testing the CAN connectors per the above pin
layout or by opening up the angle sensor box (remove the lid) and making sure the red LED on the
board is blinking. If not, most likely power is missing.
CAN-Bus electronics in length/angle sensor box.
Verify by measurement on connector X1:
Measure between pins 3 (GND) and 2 (+). Next, check all pins of the CAN bus cable for continuity
and cross-check for short circuits. E-64 means that the pressure transducer is working fine, but the
cable reel is not – so we most likely have a defective connection between those two components. If
this is tested to not be the case (missing connections, short circuits – measure with Ohm-meter), the
board in the cable reel might be defective (see also chapter Angle Sensing).
If you suspect a sensor error or problem with a sensor, compare the indicated physical value of the
sensor on the display screen with the real value, i.e. length, angle, etc.
The voltages given are internal calculation values only; you will not be able to actually measure them
anywhere on the electronics! Typical values to be expected are:
Pressure transducers (piston and rod), 500mV @ 0 PSI; 4500mV @ maximum PSI
Length sensor, 500mV @ retracted boom length; voltage extended depends on the various
boom lengths.
Angle sensor, 4500mV at 0; 2500mV at 45; or 500mV at 90
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