pump stops or fails to reach the top
solution：
observe running status of pump:
1.when working, injection pump is not running.
(1) Check whether both ends of connector of the motor
are connected well.
(2) Check whether the conductivity of motor lead wire
is good.
(3)check motor drive circuit of circuit board
2. when working, injection pump is running：
(1) check light sensor
(2) Check whether the conductivity of light sensor to
adapter and ISE circuit board is good and both ends of
connector are connected well.
(3) check light sensor signal
check voltage between P901A plug pin 1，3 (measured
when plug it into plug seat), if the voltage is 5v, check
potential (measured when plug it into plug seat)of
P901A plug pin 2，3; The potential is high when
reaching to the zero position(discharging liquid),
otherwise the potential is low. If the potential is
normal, Check whether the conductivity of light sensor
to adapter and ISE circuit board is good; if not normal,
replace the light sensor
If the voltage is not 5v, check voltage between P190
plug pin 1，3; if voltage is 5v, replace light sensor
adapter. If the voltage is not 5v, check input circuit of
ISE circuit board.
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