31
GND CA4
BOOM LENGTH POTENTIOMETER VERIFYING
BOOM LENGTH POTENTIOMETER VERIFYING
The machine boom must be completely retracted.
Voltage higher or
at 5V
Boom Length
potentiometer broken
(**)
Verify between
GND e CA4
a voltage of r250mV
Boom Length
Potentiometer broken
(**)
Perform a Boom extension.
TRUE
Losses of Signal
The variation is continous
and linear
The Main pc board is faulty.
Proceed with the replacement
(*)
FALSE
Verify with a voltmeter that the
signal increases in a linear
and continous way.
The signal is
not correct
Problems on the Connection
Cable. Probably short circuited.
Check the cable
The signal
is correct
Boom Length
potentiometer broken
(**)
(*) REFER ALSO TO EPROM and EEPROM MEMORIES REPLACEMENT - page 32
(**) REFER ALSO TO POTENTIOMETERS ALIGNMENT - page 33
Verify on the Main PC board
the potentiometer signal on
11(GND) e 15(CA4)
CA4
GND
