Self-diagnosing system for recording apparatus
First Claim
1. An image recording system having a plurality of system elements including an image input terminal, an image processing system, an image output terminal, a user interface, and a control system including a central processing unit (CPU) for controlling operation of said system elements, said CPU including testing means for performing a fault check on said image recording system during a predetermined period in an activation sequence when a power supply of said image recording system has been turned on, wherein said fault check is an I/O function test performed on an input/output (I/O) port of an I/O controller of boards on which the respective system elements are mounted, and said testing means includes means for transmitting an output of predetermined bits from said output port of said I/O controller to said input port of said I/O controller.
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Accused Products
Abstract
An image recording apparatus consists of a control system including a CPU, an image input terminal, an image processing system, an image output terminal, and a user interface. An I/O controller is provided in each of the above units. During the power-on sequence of the apparatus, the CPU executes an interrupt test for checking whether interrupt processes of the CPU with respect to sync signals are performed correctly, and an I/O port operation test for confirming that an I/O port of each I/O controller functions correctly. When a prescribed button is pressed at the user interface, the CPU enters a diagnostic copy job mode, in which copies are actually produced in the same manner as in a normal copy mode to identify a unit in trouble.
8 Citations
14 Claims
- 1. An image recording system having a plurality of system elements including an image input terminal, an image processing system, an image output terminal, a user interface, and a control system including a central processing unit (CPU) for controlling operation of said system elements, said CPU including testing means for performing a fault check on said image recording system during a predetermined period in an activation sequence when a power supply of said image recording system has been turned on, wherein said fault check is an I/O function test performed on an input/output (I/O) port of an I/O controller of boards on which the respective system elements are mounted, and said testing means includes means for transmitting an output of predetermined bits from said output port of said I/O controller to said input port of said I/O controller.
- 4. An image recording system having a plurality of system elements including an image input terminal, an image processing system, an image output terminal, a user interface, and a control system including a CPU for controlling operation of said system elements, said CPU including diagnostic means for operating in a diagnostic mode to perform a diagnostic test on said image recording system on a condition that a predetermined operation other than turning on and off of a power supply of said image recording system has been performed at said user interface, wherein said diagnostic means includes means for providing a diagnostic copy mode in which a copy job is performed in the same manner as in a normal, non-diagnostic copy mode of said image recording system.
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7. An image recording system having a plurality of system elements including an image input terminal, an image processing system, an image output terminal, a user interface, and a control system including a CPU for controlling operation of said system elements, said CPU including means for operating in a diagnostic mode to perform a diagnostic test on said image recording system on a condition that said image output terminal has detected that said image recording system is in a predetermined state when a power supply of said image recording system has been turned on, wherein said diagnostic means includes means for providing a copy mode in which a copy job is performed in response to a predetermined condition.
- 8. An image recording system having a plurality of system elements including an image input terminal, an image processing system, an image output terminal, a user interface, and a control system including a central processing unit (CPU) for controlling operation of said system elements, said CPU including testing means for performing a fault check on said image recording system during a predetermined period in an activation sequence when a power supply of said image recording system has been turned on, wherein said fault check is an interrupt function test performed on said CPU, and said testing means includes interrupt function test signal means for invalidating a level change at an interrupt signal input terminal of said control system during said predetermined period of said activation sequence, inputting an interrupt function test signal to said interrupt signal input terminal within said predetermined period, and detecting an occurrence of an interrupt in said CPU.
- 12. An image recording system having a plurality of system elements including an image input terminal, an image processing system, an image output terminal, a user interface, and a control system including a CPU for controlling operation of said system elements, said CPU including diagnostic means for operating in a diagnostic mode to perform a diagnostic test on said image recording system on a condition that a predetermined operation other than turning on and off of a power supply of said image recording system has been performed at said user interface, wherein said diagnostic means includes means for providing a diagnostic copy mode in which a copy job is performed in response to a predetermined condition.
Specification