How to reset maintenance drum in toshiba estudio

Toshiba eStudio maintenance Drum reset 16s , 160, 163, 165, 166, 182 181 195 200 212 224 250.
Enter 08 Service mode
check these addresses
340 Drum counter end setting. Drum Life:160 and 200 are 27,000 copies.
250 is 33,000 copies. If set to 0:Nothing displays.
673 Resetting drum related counters (08/355 and 08/401) works only if 08/869 is set to 1=SRU, if set to 0 is=CRU.
SRU: Service Replaceable Unit.

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