NEC Super Script 4400 Maintenance Manual page 149

7 .2.6 High Voltage Unit
Tools
Phillips Screwdriver #1, #2
Disassembly Procedures
1. Remove the side cover (LU). (See the item 7.1.1.)
2. Remove the side cover (L). (See the item 7.1.2.)
3. Remove the shield cover (upper). (See the item 7.2.1.)
4. Remove the shield cover A.(See the item 7.2.1.)
5. Remove the shield cover B.(See the item 7.2.1.)
6. Disconnect all the harness connectors (5 pcs.) connected to the MCTL Circut Card.
7. Remove the set screw ST3 6 (2 pcs.) of fun assembly. (See the item 7.3.4.)
8. Remove I/F Circut Card guide rail (upper).
9. Remove the set screw ST3 6 (5pcs.) of shield case 'A' assembly.
10. Remove the set screw ST4 10 (2 pcs.) of base cover (R).
11. Remove the base cover (R).
12. Remove the fan duct of power supply.
13. Disconnect all the harness connectors (5 pcs.) connected to the high voltage unit.
14. Remove the set screw ST3 6 (1 pc.) and BT3 8 (6 pcs.) of high voltage unit.
15. Remove the high voltage unit.
Assembly Procedures
1. Install a new high voltage unit. When installing, have a lower hole of the high voltage Circut Card meet a
projection of the base.
2. ( i) When installing, put each electrode terminal through the holes of Circut Card. from the back.
3. (ii) Having the set holes for the electrode meet the installation hole of Circut Card, fix the both by screwing.
4. After the above , follow exactly the reverse order of disassembling procedures.
5. Upon completion of the installation, connect the power supply cable.
6. Turn the power supply switch ON.
7. Execute the test print in Service Mode.
8. Confirm the operation and print quality.
WARNING! High Voltage Unit generates high voltage (5KV). You may get electric shock if you touch the unit
while it is powered on. Therefore, turn on the unit only after having installed the side cover (L).
140 SuperScript 4400 — Maintenance Guide