| 摘要 |
An image forming apparatus includes a CPU (Central Processing Unit) for incrementing a mechanical counter in accordance with the count of an electronic counter. For example, when the count of the electronic counter exceeds zero or similar preselected value, the CPU starts incrementing the mechanical counter. Alternatively, after the count of the electronic counter has been restored to zero, the CPU may increment the mechanical counter at the same time as it increments the electronic counter. The two different counters are maintained coincident at all times by simple control.
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