Malfunction 2: probe arm to the coupler's position can
run, but the photo sensor cannot detect any signal
Solution: 1, multimeter readings between the positive
changes from 5V to 0, indicating photo sensor and lead
are normal
(1) Check conductors
Check whether the Sample&reagent probe’s photo sensor
J202 to the reagent disc circuit board (P042) is in good
connection, and whether the both ends of the connectors
are good.
(2) Check the input of the sample&reagent disc circuit
board’s photo sensor.
2, No change on multimeter reading
(1) Check conductors
Check P042 plugs 4,5,6 core is connected well,
connection of both ends is good.
(2) Check the photo sensor
Check voltage between P042 pin plugs 4,6, if the voltage
is not 5v, check the connection plug is connected well. If
the voltage is 5v, check the J042 socket 11 feet’s potential.
Rising to the peak when the potential is high, if not, the
potential is low. If the potential is not normal, check the
photo sensor.
8-4
Reagent probe
abnormal.
Sample&reage
nt probe is in
the effective
status of
touching and
liquid
detecting all
the time
status of touching and liquid detecting all the time
Solution: If the arm of the probe is not moving,
repeatedly and manually pull up the probe (imitate the
touching), repeatedly touch the tip of the probe
gently(imitate the liquid detection), transfer the multimeter
to DC, negative point of P042 plug No.10 core, positive
point P042 plug No.9 core
Initial State: Multimeter reads “0”
Touching: Multimeter reads “1”
1. Multimeter reads between 5V and 0, indicates that the
photo sensor and the lead are normal
(1) Check the lead
Check the connection of probe’s photo sensor J202 to the
sample&reagent circuit board (P042)
check whether the connection of probe photo sensor J202
with sample&reagent dick circuit board wire（Ｐ042）is
good or not, check the connection of the both ends.
(2) check reagent dick circuit board
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