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Internal Components 3
(HP 4Si)

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[Internal Components 3 (HP 4Si)]
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select a Part Number in the table.

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Part Number Description
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Printer Compatibility Notes
104B-1RG5-0357-020Rear Plate AssemblyAll
104B-1ARB1-0401-000Plate, RearAll
104B-1BRB1-1669-020Plate, BlankingAll
104B-1CXA9-0267-000Screw, TP, M3X6All
104B-2RG5-0140-000TP Rail AssemblyIIISi/4Si
104B-4RB1-0820-020Frame, Right, Front4Si
104B-5RB1-0821-000Frame, Right, Upper4Si
104B-6RB1-0847-000Sheet, InsulatingAll
104B-7RB1-0848-000Sheet, InsulatingAll
104B-8RG5-0168-000DC Power Supply PCB 110/115V4Si
104B-8RG5-0169-030DC Power Supply PCB 220/240V4Si
104B-8AVD5-0068-001Fuse 100/115VAll
104B-8AVD5-0104-001Fuse 220/240VAll
104B-9RG5-0164-000Power Inlet Assembly 100/115V 600 dpiAll
104B-9RG5-0165-000Power Inlet Assembly 220/240V 600 dpiAll
104B-9BWT2-5025-000Support, PCBAll
104B-9CFA9-0031-000Label 220/240VAll
104B-9CFA9-0032-000Label 100/115VAll
104B-10ARG5-0160-000Shield Plate Assembly4Si
104B-10EC2009-00006Lower MIO Cover Plate4Si
104B-10FC2009-60109Upper MIO Cover PlateIIISi/4Si
104B-10GC2009-60105Cable, Parallel Assembly4Si
104B-10HC2009-40003MIO Guide AssemblyIIISi/4Si
104B-10IC2009-67901  Formatter PCB, Factory Rstd 4Si
104B-11RG5-0126-000Right Rear Frame Assembly4Si
104B-12RG5-0154-000Formatter Pan Cover4Si
104B-12CRH7-1163-000Fan, DC24V4Si
104B-13RG5-0091-000DC Power Supply CableAll
104B-14RG5-0106-000DC Driver PCB CableAll
104B-15RG5-0156-030Cable, Control Panel4Si
104B-16RG5-0108-000Cable, Paper Pick-upAll
104B-17RG5-0130-000Interface Cable4Si
104B-17RG5-0157-000Cable, Interface4Si
104B-19WT2-5025-000Support, PCBAll
104B-22WT2-0204-000Clip, CordAll
104B-23WT2-5031-000Clip, CordAll


Diagram 104B, above, illustrates HP 4Si. This diagram is almost identical to the HP IIISi version (Diagram 104A). The difference is that the pan assembly which houses the formatter board has been improved to accommodate two MIO cards. In addition there is a permanent Centronics parallel interface connector.

Item 9 was revised and slightly improved with some additional high-voltage capacitance in the AC line filtering circuit. All newer NX printers came with the newer part (higher numbered assemblies) and all older printers came with the older assemblies (lower numbered). In applications where the AC power isn't very clean and has switching spikes the newer version may be a bit more fault tolerant. For most people who have clean AC power in their buildings, there will not be any performance difference.

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