RV series

RV
Series information
Type	Single drum

Resources

Tutorials

The following user created tutorials apply to the RV series.

• Calibrating print position (Z+)
• Common drum issues (Z+)
• Drum color codes
• Drum repair (Z+)
• Drum safety test (Z+)
• Elongation/shrinkage
• Ink (re)mixing
• Ink tube transfer
• Mac OS driver installation
• Metric mode
• Printing folded sheets
• Screen printing with riso stencils
• Shock absorber replacement
• Thermal-pressure motor lock (TPH gear)

Maintenance

Replacement parts

Name	Part no.	Stock	Unit
Feed tire	035-14303 021-14301	2 / riso	Paper feed
	The two matching rollers in the 1st paper feed—the outer one is the "scraper" (feeds multiple sheets in) and the inner one is the "pickup" (separates the top sheet). Each is an inner plastic core and outer tire (this is the part for the tire). The inner (pickup) roller should use OEM, the outer (scraper) roller can use generic—generic tires tend to be eccentric (egg-shaped) and a smaller diameter than the originals. The RP uses 3 rollers, two of which are tires on a proprietary core, but the third roller requires a solid feed tire.
Stripper pad	019-11833	3 / riso	Paper feed
	The stripper pad puts upward force and friction on the multiple pages that are fed into the pickup roller, so that the teeth of the tire only propel the top sheet into the riso. It is the rubber part that wears the fastest and must be replaced regularly for stable paper feed. Very old risos may use a different stripper unit, which takes an older stripper pad type (a thin square), otherwise this part is universal. An alternative grey stripper pad is listed under part no. 019-11834—it uses a harder material, which is meant to last longer and be better for heavier paper stocks.
Feed roller core	023-12306 021-14302	1 / riso	Paper feed
	The plastic core of the feed rollers (the feed tires are stretched around these) contains a one-way bearing, which allows the paper to be pulled freely through the 1st paper feed by the 2nd paper feed and press sections. This bearing wears down over time, which will either decrease the feed power or cause the roller to drag on the rest of the system. Replacement cores ship dry, and will need oiling.
Elevator shaft gear	023-12215	1 set	Paper feed
	Two of these gears transport the elevator up and down. When the elevator is damaged the teeth will snap off these plastic gears—a 3 mm roll pin punch is needed to replace them.
Flaw bearing	600-50057	2 / riso	Paper feed
	Four of these are used in the elevator, they are very delicate and will break apart if the elevator is damaged.
Link plate A	023-12109	1 set	Paper feed
	A pair of these is responsible for locking down the side guides on plastic feed trays. If the guides are forced apart while locked, these pieces will break.
Lock plate B	030-14130	1 set	Paper feed
	A pair of these is responsible for locking down the side guides on metal feed trays. If the guides are forced apart while locked, these pieces will break.
Separator needle (Z+)	023-21002 024-21038	1 / riso	Paper ejection
	This needle is responsible for peeling paper off of the drum in the ejection process—if damaged (or improperly calibrated) paper will stick to the drum more and/or the needle will leave a drag mark down the center of the print. In the rare occurrence of catastrophic drum failure inside the riso, the separator needle will often smash against the surface of the drum (or catch under clamp)—as a result of (1) being adjusted too close to the drum, or (2) a component of the drum raising too high off the surface of it. Usually this harms the drum more than the needle, but sometimes the needle shatters too. The riso can operate without the needle (so long as the rubber hose is kept out of the paper path)—but the paper will stick to the drum more frequently. There are two versions of this needle—the sharper, earlier needle is part no. 023-21002, while the newer snub-nosed needle is part no. 024-21038—they can be used interchangeably, so long as they are properly recalibrated. The separator needle position should always be calibrated after changing the needle.
Shock absorber bracket	046-15008	1 / riso	Press
	The first implementation of the shock absorber was adhered to a small strip of metal, but all contemporary ones are held in by a metal bracket which clips around wings on the shock absorber itself. When replacing the older style shock absorber with a newer one, the bracket must also be replaced.
Exit belts (Z+) (one-drum)	629-00002	1 set	Paper ejection
	Exit belts transport paper out of the riso—usually a suction fan pulls air down through holes in the belts to hold the paper to them while a dedicated motor powers the belts. In one-drum machines the exit belts are a set of 3 thin belts with holes running along them. Note that these belts appear very similar to two-drum belts, but they are a slightly different length and are not interchangeable. As they wear, they will stretch out and slip on their rollers—paper will become stuck in the exit area (particularly larger sheets of heavier stocks). Belts can be tested by dragging them with a fingertip—all the belts should move together—if individual belts slip, it's a sign that all should be replaced.
TPH gear	612-10010	2 / riso	Master making
	This small plastic gear is part of the TPH pressure system—when it fails the riso will no longer be able to lift the thermal printhead, and will throw a T19 or P19 error. This is a critical part—when it breaks the riso will be fully non-operable until it is replaced. They break every 3–7 years. Instructions for replacement are available at: Thermal-pressure motor lock (TPH gear)
Transport bands (Z+) (one-drum)	640-60001 628-21401	1 set / riso	Master removal
	A set of 3–5 small rubber bands (o-rings) which are used to transport the stencil off of the drum and into the disposal box. When they break, the stencil will become more easily jammed between the disposal rollers. These parts can often be easily replaced with generic o-rings of a similar (or slightly smaller) size. The Japanese size for these is listed as 2×140 (2 mm cross section and 140 center circumference) or S42 (a JIS designation). The closest ISO size is A0425 (1.8 mm cross section, and 42.5 mm inner diameter). In imperial sizes these bands have a 1/16" cross section—the closest standard size (slightly smaller) is ⌀ 1¾ in (outer diameter)—however in practice, slightly smaller o-rings (down to ⌀ 1½ in) have been more effective. All of the bands in the set should be replaced at the same time—A4/B4/legal machines use 3 bands, while most A3/tabloid machines use 4; tabloid machines use 5. Note that these bands appear very similar to two-drum bands, but they are a slightly different length and are not interchangeable.

Specifications

	Print area	DPI	Year
RV9690	A3
RV9698	A3

Usage

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