HP 3500 Service Manual - Page 193
Transfer unit life detection,
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If neither the PS12 or the PS13 receives light, the DC controller judges that the "transfer unit is not present, OUT" and sends an error message to the formatter. Figure 5-47. NOTE Transfer unit detection If light is received only at one of the light receivers on the PS12 or P13, it will not be judged as ITB unit OUT, but will be judged as the following errors. Error in the PS12 only: Color misregistration sensor abnormality or, Error in the PS13 only: Waste toner full warning Transfer unit life detection The printer detects whether the transfer unit is coming to the end of its life. The DC controller monitors the accumulated rotation time of the drum motor (M3) for detection of transfer unit life. The DC controller writes the drum motor rotation time into the EEPROM in the DC controller every specified time when the drum motor rotates. The EEPROM, that stores the accumulated rotation time of the drum motor, judges that the transfer unit is at the end of its life when the accumulated time exceeds a specified time and sends an error message to the formatter. Figure 5-48. Transfer unit life detection control ENWW Image formation system 169
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