Replenishing of the supply of toner is determined based on the T/C ratio and B/W ratio. If T/C is 14 % or more, toner replenishing is not carried out regardless of the B/W value. If T/C is less than 14 %, toner replenishing is determined according to the B/W value. Toner is replenished until T/C becomes 14 %. T/C ratio (%) More than 14 13.5 to 14 13 to 13.5 12.5 to 13 12 to 12.5 10 to 12 Less than 7 B/W ratio � More than 2000 More than 1000 More than 500 More than 500 More than 0 toner replenishing not supply supply supply supply supply supply
Proceeds to the T/C recovery mode
� The greater the value of B/W in the table, the higher the B/W ratio (high image density original).
