Image forming apparatus with controlable fan

An image forming apparatus comprising:

• a housing;
• an image forming device provided in an interior of the housing;
• a fan configured to cool the interior of the housing;
• an AC/DC board configured to convert an AC voltage supplied from an AC power source into a DC voltage;
• a first temperature detecting element configured to output a signal corresponding to a temperature in the housing;
• a second temperature detecting element configured to output a signal corresponding to a temperature of an element mounted on the AC/DC board;
• a controller connected to the first temperature detecting element and the second temperature detecting element;
• and
• a heater,
• wherein the controller controls the fan when at least one of a first condition and a second condition is satisfied, the first condition being a condition in which a first detection temperature detected based on the signal received from the first temperature detecting element is not less than a first temperature threshold, the second condition being a condition in which a second detection temperature detected based on the signal received from the second temperature detecting element is not less than a second temperature threshold,
• wherein the image forming device forms, on a sheet, a toner image with toner,
• wherein the heater heats the sheet to fix the toner image on the sheet, and
• wherein the controller is configured to
• obtain a turn-on cumulative value that is a sum of the number of turn-ons by which the heater is turned on, and
• start to control the fan when the turn-on cumulative value becomes not less than a cumulative threshold.

An image forming apparatus comprising:

• a housing;
• an image forming device provided in an interior of the housing;
• a fan configured to cool the interior of the housing;
• an AC/DC board configured to convert an AC voltage supplied from an AC power source into a DC voltage;
• a first temperature detecting element configured to output a signal corresponding to a temperature in the housing;
• a second temperature detecting element configured to output a signal corresponding to a temperature of an element mounted on the AC/DC board;
• and
• a controller connected to the first temperature detecting element and the second temperature detecting element,
• wherein the controller controls the fan when at least one of a first condition and a second condition is satisfied, the first condition being a condition in which a first detection temperature detected based on the signal received from the first temperature detecting element is not less than a first temperature threshold, the second condition being a condition in which a second detection temperature detected based on the signal received from the second temperature detecting element is not less than a second temperature threshold, and
• wherein the controller is configured to
• obtain followability information that is information on followability of the second temperature detecting element with respect to the temperature of the element mounted on the AC/DC board, and
• modify the second condition based on the followability information.

An image forming apparatus comprising:

• a housing;
• an image forming device provided in an interior of the housing;
• a fan configured to cool the interior of the housing;
• an AC/DC board configured to convert an AC voltage supplied from an AC power source into a DC voltage;
• a first temperature detecting element configured to output a signal corresponding to a temperature in the housing;
• a second temperature detecting element configured to output a signal corresponding to a temperature of an element mounted on the AC/DC board;
• a controller connected to the first temperature detecting element and the second temperature detecting element;
• and
• a heater,
• wherein the controller controls the fan when at least one of a first condition and a second condition is satisfied, the first condition being a condition in which a first detection temperature detected based on the signal received from the first temperature detecting element is not less than a first temperature threshold, the second condition being a condition in which a second detection temperature detected based on the signal received from the second temperature detecting element is not less than a second temperature threshold,
• wherein the image forming device forms, on a sheet, a toner image with toner,
• wherein the heater heats the sheet to fix the toner image on the sheet, and
• wherein the controller is configured to
• obtain a turn-on cumulative value that is a sum of the number of turn-ons by which the heart is turned on,
• start to control the fan when the turn-on cumulative value becomes not less than a cumulative threshold,
• obtain followability information that is information on followability of the second temperature detecting element with respect to the temperature of the element mounted on the AC/DC board, and
• set the cumulative threshold when the followability information indicative of low followability is obtained so as to be lower than the cumulative threshold when the followability information indicative of high followability is obtained.

An image forming apparatus comprising:

• a housing;
• an image forming device provided in an interior of the housing;
• a fan configured to cool the interior of the housing;
• an AC/DC board configured to convert an AC voltage supplied from an AC power source into a DC voltage;
• a first temperature detecting element configured to output a signal corresponding to a temperature in the housing;
• a second temperature detecting element configured to output a signal corresponding to a temperature of an element mounted on the AC/DC board;
• and
• a controller connected to the first temperature detecting element and the second temperature detecting element;
• wherein the controller controls the fan when at least one of a first condition and a second condition is satisfied, the first condition being a condition in which a first detection temperature detected based on the signal received from the first temperature detecting element is not less than a first temperature threshold, the second condition being a condition in which a second detection temperature detected based on the signal received from the second temperature detecting element is not less than a second temperature threshold,
• wherein the AC/DC hoard includes a step-down transformer and a primary-side element connected to a primary side of the step-down transformer,
• wherein the second temperature detecting element is configured to detect a temperature of the primary-side element,
• wherein the image forming apparatus further comprises a heater and a triac connected to the primary side of the step-down transformer and configured to switch energization to the heater, and
• wherein the primary-side element is the triac.

An image forming apparatus, comprising:

• a housing;
• an image forming device provided in an interior of the housing;
• a fan configured to cool the interior of the housing;
• an AC/DC board configured to convert an AC voltage supplied from an AC power source to a DC voltage;
• a temperature detecting element configured to output a signal corresponding to a temperature of an element mounted on the AC/DC board;
• and
• a controller connected to the temperature detecting element, the controller being configured to control the fan when a detection temperature detected based on the signal received from the temperature detecting element becomes not less than a temperature threshold,
• wherein the controller is configured to:
• obtain followability information that is information on followability of the temperature detecting element with respect to the temperature of the element mounted on the AC/DC board;
• and
• modify, based on the followability information, a condition for determining whether the detection temperature is not less than the temperature threshold.