Service manual

Troubleshooting by Indication on the Remote Controller SiUS28-902_a
103 Troubleshooting
Troubleshooting
NO
YES
YES
YES
NO
NO
YES
NO
YES
NO
+5V
(4)
(3)
(2)
(1)
Check for the points shown below.
 Is the stop valve open?
 Is the HPS connector properly connected to the
main P.C.B.?
 Does the high pressure switch have continuity?
Are the
three points above
OK?
Rectify defective points, if any.
·
Mount a pressure gauge on the high-pressure service port.
· Connect the Service Checker.
· Reset the operation using the remote controller,
and then restart the operation.
Does the stop
due to malfunction (
E3)
recur?
Is the HPS
operating value normal
(i.e., 580psi)?
Are the
characteristics of the high
pressure sensor normal?
(See *1.)
Replace the HPS.
Replace the high pressure sensor.
Is the
pressure detected with
the P.C.B. normal?
(See *2.)
Replace the main P.C.B..
·
The high pressure sensor is normal, and the pressure detected with the P.C.B. is also normal.
· The high pressure has really become high.
CHECK 1
*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, take the measurement of voltage at the
connector, and then convert it to pressure according to information on P.168.)
*2: Make a comparison between the high 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.
Connector for high
pressure sensor (Red)
High
pressure
sensor
Micro controller
A/D input
Take measurement of DC
voltage between these wires.
Red
Black
White
(Refer to P.156)
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts could be damaged.