Drum repair (Z+)

Drum repair (Z+)
Drum repair (Z+)
Difficulty	Expert
Duration	½–3 hours
For series	Z+Any machine released with or after the RZ line, i.e. RZ/RV/EZ/EV/SF/SE and MZ/ME/MF/MH machines.
Tools	JIS phillips #2 screwdriver 4 in (100 mm) zip ties Clear packing tape Doublestick tape Solvent Isopropyl alcohol Gloves Rags

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How to: clean an MZ/EZ/RZ drum to change colors

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There are many reasons a drum may need to be opened—to repair an issue, clean out old ink, transition to a new color, etc. This article outlines the common processes in disassembly, testing/cleaning, and reassembly, but does not outline specific maintenance (i.e. correcting the squeegee gap, etc.)—those are separated out into their own tutorials.

The golden rule of drum repair is: only go as far as necessary, and no further.

Drum repair is inherently dangerous to the riso. Misassembling a drum and trying to print with it can result in totalling the drum and damaging the riso itself; many of the individual components in the drum are quite delicate; the process is arduous. So doing as little as possible on drums is a good way of limiting the potential for error.

Evaluation

Before opening a drum it's important to create a plan of attack—to determine how much disassembly is required. A lot of assessment can be done before opening up a drum—both how it is functioning (1) mechanically, and (2) electrically.