To start the process you have to wait till the ink monitor says the ink cart is very low and then after more use it will come back with a warning the the ink is empty and it wants you to replace that ink cart. So then you take out that exact ink cart, modify it for refilling
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I never wanted to do the NVRAM complete reset because I was scared of losing the network MAC address as mention somewhere else on this forum. And basically controlling the consumable level independently was interesting… My c3200n printer was bought last month (09/2006), guessing here that the bios may be different depending on
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1) Turn on Printer while holding the 1 & 2 buttons.

2) Using button #1 scroll down untill you see "Diagnostic Mode 00.22.00", then hold down buttons 2 & 3.

3) You now have "Engine Diag Mode Level 4" showing on the display.

4) Use Buttons 1 & 5 to scroll between menu’s. Scroll down to "Counter Set".

5)
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The 10 step instructions for re-setting the drum/belt/toner cartridges you suggested for the worked perfectly except for turning the printer on - I unplugged and re-plugged the unit for those steps for my C5400.
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1) Power on printer while holding both the + & - buttons simultaneously; release when “OKIUSER” is displayed.
2) Press either the + or - button until “ENGINE DIAG MODE” is displayed; press the Enter button and “DIAGNOSTIC MODE xx.xx.xx” will be displayed.
3) Press and hold both the - & On-line buttons
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1. Open the front cover and leave open while completing the following steps.
2. Turn the printer off.
3. Hold the ’go’ button while turning the printer on. All panel lights should be on.
4. Release the ’go’ button.
5. Press the
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The gear turns slowly every time the cartridge is used. When it gets to the end of its range, a spring stops it from turning further and the printer will not print until the cartridge is replaced. When a cartridge is refilled, this flag gear must be reset or printer will think the cartridge is still empty and it will not work. You can also squeeze some extra life out of a used cartridge using this method.
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1) Open the front door - the message ’Cover is Open’ will appear.
2) Press and hold the cancel button.
3) Press the Reprint button - the message ’Reset Parts Life’ should appear.
4) Then do the following:
B.TNR-H - accepted should display. Press ^
B.TNR-S - accepted should display. Press ^
Y.TNR-H - accepted should display. Press ^
Y.TNR-S - accepted should display. Press ^
M.TNR-H - accepted should display. Press ^
M.TNR-S - accepted should display.
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  Here’s the page count reset I’m using if anyone wants it:
1. Open the front cover and leave open while completing the following steps.
2. Turn the printer off.
3. Hold the ’go’ button while turning the printer on. All panel lights should be on.
4. Release the ’go’ button.
5. Press the ’go’ button 2 times.
6. Pause.
7. Press the ’go’ button 5 times.
8. The toner light should be off.
9. The paper light should be on or flashing.
10. Close cover. The ready light should be the only light on.
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