I have a Ricoh Aficio GX5050N and I have cleaned out the waste ink tank but cannot reset the counter. the INK CU replace command does not appear to work.

CLEAN THE MACHINE
These are general guidelines for cleaning and maintenance.
Item Action:
External Covers Clean with damp cloth.
Paper Feed Rollers, Connecting Rollers Clean with damp cloth.
Right Ink Sump Clean with damp cloth.
Friction Pad (Paper Trays) Clean with damp cloth.
Ink Collection Tank: Replace then reset counter with
SP3-008-003

change cartridge.

Push the menu key.
Push enter key three times.
Turn printer off then on

See my video at www.condetv.com
Search for waste ink.

This may have to do with the method of replacement. Leave the printer on, remove the waste tank, clean the area (sensors may detect residual ink) replace the empty waste tank. If this doesn't work, there may be a chipset on the waste tank to indicate end of life. This is a way for the manufacturer to continue making a truckload of money from the end user. Generally the only way around this is to modify your printer to by-pass this part of the circuit (an electronic solution to replace the chipset). This method will most likely void your warrantee.

This is an error that has to do with the ink drying up on the maintenance unit. This cannot be fixed by the end user and must be fixed by Ricoh. Error 990 is a Ricoh defect in which the printer should qualify for replacement.

BULLETIN NUMBER: J001/J003/J006/J007/J010/J011 – 021 07/02/2008
APPLICABLE MODEL:
GESTETNER – GX3000/GX3050n/GX5050n
LANIER – GX3000/GX3050n/GX5050n
RICOH – GX3000/GX3050n/GX5050n
SAVIN – GX3000/GX3050n/GX5050n
SUBJECT: SC999 OCCURS
SYMPTOM:
An SC999 (Maintenance Stepper Motor Home Position Error) occurs.
CAUSE:
Some of the ink in the machine has dried, and as a result the maintenance stopper motor cannot rotate or
the levers come loose.
NOTE: The following conditions make it easy for the ink to dry up (See Appendix 3 for more details):
- Low humidity
- Long intervals between machine usage
- Total period of usage is long
- Low Print Volume

COPY QUALITY
Fixed ink Stepper Motor
Right Flushing Gate
Levers
Tech Service Bulletin No. J001/J003/J006/J007/J010/J011 – 021
Page 2 of 5
SOLUTION:
Production Countermeasure:
The shapes of some parts in the Maintenance Unit have been changed in two steps ("Step 1" and "Step 2"
below).
NOTE:
See Appendix 1 for the details of the Step 1 and Step 2 modifications.
See Appendix 2 for the visual differences among the unmodified unit, the Step 1-modified unit, and
Step 2-modified unit.
See UNITS AFFECTED for the Serial Number cut-in of Steps 1 and 2.
Field Countermeasure:
1. Cycle power OFF/ON.
2. Install one of the modified Maintenance Units ("Step 1" or "Step 2").
NOTE: For customers experiencing a SC999, have them contact 1-800 Ricoh38 for replacement.

Sorry don't know that model here...:(

The book doesn't really tell you where it is in the machine but if you open the door in front of the copier, look for a white plastic bottle with toner in. Remove the toner bottle from the machine and dispose of the toner bottle and replace it with a new one or dispose of the waste toner. Clean the bottle and replace it back into the machine.

100% agreed with rrrdddrrrddd. In addition:
Go to Menu->System->INK CU Replace. You will get a warning that overflow may occur(and it's really a messy job), reset the counter and everything should be OK.

990 A Waste Tank Full Sensor Defective
The waste ink tank full sensor (a
photosensor) on the corner of
the waste tank is not operating.
• Waste ink tank sensor on the corner of
the ink waste tank is defective.
• Replace the waste ink tank.