HP CP6015dn Service Manual - Page 171
Fuser-failure detection, Fuser identification, Between TP1 and TP2: 20° C 68° F or more
UPC - 883585363018
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Page 171 highlights
Fuser-failure detection When the DC controller detects any of the following conditions, it determines that the fuser has failed. It then interrupts power to the fuser heaters and notifies the formatter. ● Abnormally high temperatures: Temperatures are too high for any of the following components, at any time: ◦ TH1: 223° C (433° F) or higher ◦ TH2: 195° C (383° F) or higher ◦ TH3: 223° C (433° F) or higher ◦ TH4: 195° C (383° F) or higher ◦ TP1: 240° C (464° F) or higher ◦ TP2: 240° C (464° F) or higher ● Abnormally low temperatures: Temperatures are too low at any of the following components after the product has initialized. ◦ TH1 or TH3: 120° C (248° F) or lower ◦ TP1 or TP2: 140° C (284° F) or lower Or, the temperature drops in either of the thermopiles (TP1 and TP2) by 30° C (86° F) or more within a specified length of time. ● Abnormal temperature rise: The temperature-detection sensors do not reach a predefined temperature within a specified length of time after the fuser heaters are turned on. ● Temperature-detection-sensor failure 1: The converted analog-to-digital value of each temperature detection sensor is abnormal. ● Temperature-detection-sensor failure 2: The difference in temperature between pairs of thermistors or thermopiles is greater than a predetermined amount. Following are the temperature differences for each pair: ◦ Between TP1 and TP2: 20° C (68° F) or more ◦ Between TH1 and TH3 (fuser-roller ends): 30° C (86° F) or more ◦ Between TH2 and TH4 (pressure-roller ends): 25° C (70° F) or more ● Drive-circuit failure: The power-supply frequency is out of the specified range when the product is initializing or in standby mode. The specified range is between 40 and 70Hz. ● Fuser discrepancy: The fuser-ID voltage does not match the power-supply voltage when the product is turned on or when the right door is closed. Fuser identification Whenever the product is turned on or when the right door is closed, the DC controller detects whether the fuser is present and whether the fuser is for a 110-volt model or a 220-volt model. ENWW Engine-control system 129
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