Shock absorber replacement: Difference between revisions

Shock absorber replacement
Shock absorber replacement
Difficulty	Expert
Duration	60 minutes
For series	Some one-drum Z+Any machine released with or after the RZ line, i.e. RZ/RV/EZ/EV/SF/SE and MZ/ME/MF/MH machines. machines SE
Tools	JIS phillips #2 screwdriver Metric hex wrenches
Parts	046-15009 1 × Shock absorber 046-15008 1 × Shock absorber bracket (if not already installed)

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Revision as of 22:58, 27 February 2026

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On some models of one-drum Z+Any machine released with or after the RZ line, i.e. RZ/RV/EZ/EV/SF/SE and MZ/ME/MF/MH machines. machines, a small black rubber shock absorber helps soften the impact of the pressure lever (used to move the pressure roller up and down for each rotation of the drum. Over time, the shock absorber wears down—when it is fully deteriorated the riso can no longer be used for printing. The symptoms of this issue are different depending on if the pressure roller is stuck in the up position or the down position.

If the pressure roller is stuck in the down position, pages will feed partially into the riso, making it into the area above or just past the pressure roller, where they will halt and trigger a paper jam. These pages were never pressed onto the surface of the drum, so they will have no image printed on them.
If the pressure roller is stuck in the up position, pages will come out over inked, with ink spread across the whole back of the sheet and continuous ghosting on the front. Furthermore the drum will be difficult or impossible to remove, as the pressure roller will be dragging against it as it is pulled out of the risograph.

The shock absorber can be replaced, but it is a difficult task which involves partially disassembling the main drive of the risograph, in the back of the machine.

Background

Not all one-drum Z+Any machine released with or after the RZ line, i.e. RZ/RV/EZ/EV/SF/SE and MZ/ME/MF/MH machines. machines use a shock absorber—all models do, as do higher model number SE machines (all of which are for A3/tabloid paper). Known models which use a shock absorber are as follows:

EZ200	EZ201	EZ220	EZ221
EZ230	EZ231	EZ300	EZ301
330	331	370	371
390	391	570	571
590	591	970	977
990	997	1070	1090

@@ Line 28: / Line 28: @@
 == Background ==
-Not all one-drum {{Z+}} machines use a shock absorber—all {{machine chip|EZ}} models do, as do higher model number {{machine chip|RZ}}{{machine chip|SF}}{{machine chip|SE}} machines (all of which are for tabloid paper). Known models which use a shock absorber are as follows:
+Not all one-drum {{Z+}} machines use a shock absorber—all {{machine chip|EZ}} models do, as do higher model number {{machine chip|RZ}}{{machine chip|SF}}{{machine chip|SE}} machines (all of which are for A3/tabloid paper). Known models which use a shock absorber are as follows:
 {| class="wikitable"
-| {{machine chip|EZ200}} || {{machine chip|EZ201}} || {{machine chip|EZ220}} || {{machine chip|EZ221}}
+| EZ200 || EZ201 || EZ220 || EZ221
 |-
-| {{machine chip|EZ230}} || {{machine chip|EZ231}} || {{machine chip|EZ300}} || {{machine chip|EZ301}}
+| EZ230 || EZ231 || EZ300 || EZ301
 |-
 | {{machine chip|EZ330}} || {{machine chip|EZ331}} || {{machine chip|EZ370}} || {{machine chip|EZ371}}