Hitachi IJ UX, Service Manual, Page: 184 / 308

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4.15.3 Repairing method for the makeup pump
1 Remove the tube connecting block of makeup reservoir, and then connect
the cleaning bottle to the pipe of pipe N.
(You can apply pressure more easily by putting a tube between the pipe
and the cleaning bottle.)
2 Operate the pump and then MV7 on the “Solenoid Valve/Pump Test” screen.
3 Apply pressure with the cleaning bottle.
4 When the makeup of the hand pump flows to the pipe N, the repair work is completed.
If the pump cannot be repaired with the cleaning bottle, use the hand pump.
(Refer to 4.15.2 Repairing method for the supply pump.)
Such a hard sticking which cannot be repaired with the hand pump will not occur.
4.15.4 Procedure for repairing the circulation pump
1 Start the circulation pump by “Start up” or “Eject ink”.
2 When the circulation pump is started, operate it for about 10 minutes with the pressure
adjusting screw turned completely clockwise to obtain the maximum pressure.
3 Stop the pump and then execute “Nozzle Backwash”. If suction from the nozzle is
confirmed, the repair work is completed. If the pump is not repaired, repeat the same
operations starting from 1 again. If the pump cannot be repaired after these steps of 1 2
3, 2 or 3 times, replace the pump unit.
4.15.5 Procedure for repairing the recovery pump
1 Operate the pump, MV1, and MV6 in this order on the “Solenoid Valve/Pump Test”
screen.
2 Operate the pump with the pressure adjustment screw turned completely
clockwise to obtain the maximum pressure.
3 If the ink flows into the recovery tube, the repair work is completed.
If the pump cannot be repaired by pump operation for 10 minutes, replace the pump unit.
Pipe
Pipe N
Cleaning bottle