interface after getting on-line, implement "mechanical
movement check", and observe the stirring rod
running status
Malfunction 1：stirring mechanism doesn’t move
Solution:
1, Check stirring mechanism up-down movements,
mechanical repair is required if resistance is big.
2, check whether both ends of connector of the motor are
connected well.
3, check whether the conductivity of motor lead wire is
good.
4, check the motor drive module of circuit board is
working normally
Malfunction 2：stirring mechanism can reach the top, but
can not check the zero position.
solution：Manually make stirring mechanism repeatedly rise
to peak, DC files transferred to the multimeter, plug the
negative point of the first 6-core P02, P02 positive pole
core plugs 5
1、Multimeter readings between the positive changes in 5V
and 0
(1) Check whether the conductivity from adapter to reaction
disk circuit board is good and both ends of connector are
connected well.
(2) Check input part circuit of reaction disk circuit board
light sensor signal.
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