Hitachi IJ PH, Service Manual

Page: 111 / 211

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4.9.5 Proximity sensor replacement procedure
Replace the single proximity sensor when it is faulty.
Caution: Perform replacement only after turning power off.
Do not spill the intensifier over the proximity sensor: Doing so could
cause a fault.
(A) Remove the viscometer from circulation unit, referring to item 4.9.1.
(B) Remove the cover setscrew, and then take out the proximity sensor.
(C)Install a new proximity sensor in the viscometer.
Caution: Install the proximity sensor making sure that the model indication
surface faces the rear. While pushing the cover in the Q direction as
shown in the illustration, tighten the cover setscrew (to determine the
position of sensor).
(D) Return the viscometer to its original position, referring to item 4.9.4. (Take care not to
forget to plug in the connectors of lead wires.)
Caution: After replacing the proximity sensor, it is necessary to replace the ink
and calibrate the viscometer (see “2.6 Calibration of viscometer”).
4.9.6 Replacing thermistor
(A) Remove the viscometer from circulation unit, referring to item 4.9.1.
(B) Remove the screw holding the thermistor fixing plate, and then replace the
thermistor.
Caution: When installing new thermistor, moisten the O-ring with intensifier to
prevent it from being scratched.
(C) Return the viscometer to its original position, referring to item 4.9.4.
Caution: After replacing the thermistor, it is necessary to replace the ink and
calibrate the viscometer (see “2.6 Calibration of viscometer”).
Cover setscrew
Cover
Proximity sensor
Model indication surface
Proximity sensor
Cover
Q
Tighten the screw
while pushing the
cover.
Cover