Ricoh D259 Manual page 17

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APV = 2 K/month, and the machine has a 5 year life time.
So printing for 5 years with an APV of 2K/month, the machine will make in
total 120K (2Kx60) prints during these 5 years.
These are called yield parts because you will not have to replace them within
the machine's life, if the APV is normal (2k per month).
You only have to replace the yield parts before the end of machine life if the
APV is higher than expected.
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