3.3 Engine part ··························································································3-8
3.3.1 EZJ93 board (MPU board)·································································3-8
3.3.2 EZJ94 board / EZJ106 board (NH board) ·············································3-10
3.3.3 EZJ103 board (I/O board)··································································3-12
3.3.4 Circuit diagram of EZJ102/103 ··························································3-13
3.3.5 Multiple Power Supply ··································································3-14
3.3.6 High voltage power supply ·······························································3-14
3.3.7 Fan Replacement Procedure ·····························································3-15
4. Maintenance of Circulation System·······························································4-1
4.1 General Structure of Circulation System················································4-1
4.2 Main Ink Tank Replacement Procedure··················································4-4
4.3 Pressure Relief Valve Replacement Procedure·········································4-5
4.4 Joint Structure and Handling·······························································4-6
4.5 Pump Unit Replacement Procedure·······················································4-8
4.6 Solenoid Valves Replacement Procedure·················································4-10
4.7 Pressure Gauge Replacement Procedure·················································4-12
4.8 Circulation Unit Replacement Procedure················································4-13
4.9 Viscometer Replacement Procedure ·······················································4-15
4.10 Print Head Replacement Procedure·······················································4-19
4.11 Troubleshooting Procedure for the Circulation System ·····························4-21
4.12 Repairing Method When the Circulation Route Is Dry or Sticks·················4-25
5. Print head-related maintenance···································································5-1
5.1 Outline structure of print head and how to remove each cover···················5-1
5.2 Nozzles Replacement Procedure (appendix: nozzle drive conditions)···········5-2
5.3 Deflecting base Replacement Procedure ·················································5-5
5.4 Cover switch Replacement Procedure·····················································5-8
5.5 Sealing valve (MV9) Replacement Procedure ··········································5-9
5.6 Heating unit Replacement Procedure·····················································5-11
5.7 Gutter base group Replacement Procedure ·············································5-13
5.8 Head base Replacement Procedure························································5-14
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