Example implementations relate to printer power management. For example, a system for printer power management may include a system power control engine to receive a power usage estimate from each of a plurality of components of a printing device and schedule a deferred service routine to identify a level of real-time performance of the plurality of components. Furthermore, a system for printer power management may include a state machine engine to estimate how close a power supply coupled to the printing device is to an over-power failure (OPF) based on the real-time performance.

A head unit control circuit controls a head unit. The head unit includes an ejector, a determination circuit, and an ejection limit circuit. The ejector includes a displaceable piezoelectric element for controlling the liquid ejection. The piezoelectric element is displaced by changing a drive signal potential. The determination circuit determines whether the piezoelectric element has a predetermined electrical storage capability. The ejection limit circuit stops the drive signal to limit the ejection of the liquid based on the determination. The head unit control circuit includes: a first terminal that outputs an instruction signal instructing the head unit to execute the determination; a second terminal that outputs the drive signal; and a third terminal that is between the first terminal and the second terminal. The third terminal has a smaller potential change width than the second terminal when the ejecting section ejects the liquid.

An image forming apparatus includes a detecting unit detecting a value of a current flowing to a photosensitive member when a voltage is supplied to a voltage applying member or a value of a voltage applied to the photosensitive member when a current is supplied to the voltage applying member, an acquiring unit acquiring information concerning a difference between potentials of the unexposed portion and the exposed portion, based on detection results of the detecting unit at times when the voltage is applied by the voltage applying member to each of an unexposed portion formed in a region chargeable by a charging member in a rotation axis direction of the photosensitive member and an exposed portion formed in a region exposable by the exposure device in the rotation axis direction of the photosensitive member, and a control unit controlling an image forming condition based on the information concerning the difference.

Provided is a method and a system for reminding a remaining time for shooting in a shooting process. The method includes: acquiring, by a terminal, a remaining memory space and/or a remaining battery power of the terminal in a shooting process; determining, by the terminal, a first remaining time for shooting according to the acquired remaining battery power; and/or determining, by the terminal, a second remaining time for shooting of the terminal according to the acquired remaining memory space; and displaying, by the terminal, the first remaining time for shooting and/or the second remaining time for shooting, or displaying, by the terminal, the smaller one between the first remaining time for shooting and the second remaining time for shooting.

A point-of-sale (POS) device includes a processor, a battery, a transaction object reader, a printer with a printer controller, and optionally a temperature sensor. The processor determines a present power discharge capability rate of the battery, optionally based on a temperature measured by the temperature sensor. The processor also calculates a first estimated power draw rate based on a first setting value for at least one of the components of the POS device, such as the printer. If the first estimated power draw rate is dangerously close to the present power discharge capability rate of the battery, a second estimated power draw rate is calculated based on a second setting value for the one or more components. If the second estimated power draw rate is no longer dangerously close to the present power discharge capability rate of the battery, the components are set to the second settings value.

Provided is an information processing apparatus including a first processing unit and a second processing unit. A diagnosis unit included in the first processing unit is configured to detect that communication of first information through a communication line is not performed properly, the communication of the first information being performed between a first CPU in the first processing unit and a second CPU in the second processing unit. A switch unit included in the second processing unit is configured to switch information to be transmitted through the communication line from the first information to second information in a case where it is detected that the communication of the first information through the communication line is not performed properly, the second information being transmitted to the diagnosis unit included in the first processing unit from a diagnosis unit included in the second processing unit.

A point-of-sale (POS) device includes a processor, a battery, a transaction object reader, a printer with a printer controller, and optionally a temperature sensor. The processor determines a present power discharge capability rate of the battery, optionally based on a temperature measured by the temperature sensor. The processor also calculates a first estimated power draw rate based on a first setting value for at least one of the components of the POS device, such as the printer. If the first estimated power draw rate is dangerously close to the present power discharge capability rate of the battery, a second estimated power draw rate is calculated based on a second setting value for the one or more components. If the second estimated power draw rate is no longer dangerously close to the present power discharge capability rate of the battery, the components are set to the second settings value.

A battery-powered printer includes a printing head that has a plurality of heat generating elements arranged along a direction orthogonal to a transport direction of a recording medium and is configured to print on the recording medium, a temperature sensor configured to measure a temperature within the printer, and a processor configured to determine whether the temperature measured by the temperature sensor is equal to or lower than a predetermined threshold, determine a constant printing speed at the time of printing under a condition where the temperature is equal to or lower than the predetermined threshold, and control the printing head and a transporting speed of the recording medium so as to cause each line of the print data to be printed on the recording medium at the constant printing speed.

A point-of-sale (POS) device includes a processor, a battery, a transaction object reader, a printer with a printer controller, and optionally a temperature sensor. The processor determines a present power discharge capability rate of the battery, optionally based on a temperature measured by the temperature sensor. The processor also calculates a first estimated power draw rate based on a first setting value for at least one of the components of the POS device, such as the printer. If the first estimated power draw rate is dangerously close to the present power discharge capability rate of the battery, a second estimated power draw rate is calculated based on a second setting value for the one or more components. If the second estimated power draw rate is no longer dangerously close to the present power discharge capability rate of the battery, the components are set to the second settings value.

Example implementations relate to printer power management. For example, a system for printer power management may include a system power control engine to receive a power usage estimate from each of a plurality of components of a printing device and schedule a deferred service routine to identify a level of real-time performance of the plurality of components. Furthermore, a system for printer power management may include a state machine engine to estimate how close a power supply coupled to the printing device is to an over-power failure (OPF) based on the real-time performance.