A few mistakes here!


VSG target on all Ricohs is 4.00v, VSP target is 1/8 of VSP (0.5v IF VSP is correct)
VSP should never be as high as 1.0v
If VSG is too low, maybe due to a dirty ID sensor, VSP will tend towards zero ON SHORT RUNS.
On long runs the machine uses VT (SP2223) and other settings.


The toner bottle turns using a motor, not a clutch. Test with SP5804 – 56. Try dragging the bottle back to check for good drive.


If you INCREASE SP 2209, the machine adds LESS toner.
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You may have a problem with the TD sensor, check SP2223. If undertoned it should be reading high, maybe up to 4.0v. If SP2223 is zero, the TD sensor has failed (You did fit the connectors at the front of the dev unit??) the machine may be in pixel count mode, check SP2208 is set to “0” (Sensor mode)


The best way to recover / maintain toner supply if there is a problem is to set (ID Pattern during run) SP 2507-1 to 1 and 2507-2 to 10, then run blank copies. The machine will pause to develop an ID patch every 10 copies DURING a run and adjust VSP to 1/8 of VSG (Make sure the ID sensor is clean first). This is safer than using forced toner supply (SP 2207) as it won't overtone the dev.



Run about 100 copies then check VT / VSG / VSP again. (Aiming for 2.2v – 3.0v / 3.9v – 4.0v / 0.3v - 0.6v respectively)


If this doesn't work, as Riijoh says, you may have a bias brg problem OR a drum earth issue (Dirty contact brush) on the drum shaft bearing. This should read about 1 – 4 ohms between the shaft and the bearing case, if it's higher you could get light copies due to poor laser discharge.