Solenoid Valves Replacement Procedure - Hitachi IJ PH Service Manual

4.6 Solenoid Valves Replacement Procedure

"Caution " : MV8 (Cleaning valve) is deferent from other valves.
Check the color of seal below.
MV8 (Cleaning valve)
1 Perform the following pre-replacement operation for each solenoid valve
that you are to replace.
Solenoid When the solenoid valve is
valve No. operated
MV1 Execute "Ink drainage".
MV2 (1) Remove the tube connection
block of the ink reservoir.
(2)Turn on the pump, MV2, and
MV3 Execute "Gutter Cleaning".
MV4 Execute "Ink drainage".
MV5 Execute "Nozzle backwash".
MV6 Execute "Ink drainage".
MV7 Execute "Ink drainage".
MV8 Execute "Pressure relief".
2 Turn off the power supply.
3 Perform "4.1.3 Approach to the parts on the rear side of the equipment".
4 Remove the connector of the solenoid valve to be replaced.
Solenoid valve No. .
MV1
MV2
MV3
MV4
Orange (Serial No.)
MV6 in this order for about
one minute, and then turn
them off.
(Solenoid/Pump Test screen)
Wire color
Solenoid valve No.
Brown
Red
Orange
Yellow
4-12
Other valves
White (Serial No.)
When the solenoid valve is not
operated
Drain the ink in the main ink
tank from the drain tube.
No operation is required.
(Take care about an ink drip.)
No operation is required.
(Take care about an ink drip.)
No operation is required.
(Take care about an ink drip.)
No operation is required.
(Take care about an ink drip.)
No operation is required.
(Take care about an ink drip.)
Drain the ink in the main ink
tank from the drain tube.
No operation is required.
(Take care about an makeup
ink drip.)
Wire color
MV5
Green
MV6
Blue
MV7
Purple
MV8
Gray