Service manual

Troubleshooting by Indication on the Remote Controller SiUS28-902_a
105 Troubleshooting
NO
YES
NO
YES
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YES
CHECK 2
Is the stop
valve open?
Open the stop valve.
 Mount a pressure gauge on the low-pressure service port.
 Connect the Service Checker.
 Reset the operation using the remote controller, and then
restart the operation.
Are the
characteristics of the
low pressure sensor
normal?
(See *1.)
Replace the low pressure sensor.
Is the
pressure detected
with the P.C.B.
normal?
(See *2.)
Replace the main P.C.B..
· The low pressure sensor is normal, and the pressure
detected with the P.C.B. is also normal.
· The low pressure has really become low.
Remove the causes by which the low pressure has become low.
*1: Make a comparison between the voltage of the pressure sensor and that read by the
pressure gauge.
(As to the voltage of the pressure sensor, make measurement of voltage at the connector,
and then convert it to pressure according to information on P.168.)
*2: Make a comparison between the low pressure value checked with the Service Checker
and the voltage of the pressure sensor (see *1).
*3:Take measurement of voltage of the pressure sensor.
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts could be damaged.
(Refer to P.157)
+5V
(4)
(3)
(2)
(1)
Connector for low pressure sensor
Micro controller
A/D input
Take measurement of DC voltage between these wires.
(Blue)
Red
Black
White
Low
pressure
sensor
Troubleshooting