Control Panel Audio Circuit Isolation for Fault Diagnosis
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Solution Overview
Problem
Diagnosing the source of errors in a control panel of an image forming apparatus, such as a malfunctioning speaker, is challenging due to the interdependence of components like the CODEC, processor, and interconnections, leading to unnecessary replacement and maintenance costs.
Innovation Solution
Incorporating a micro-computer (MICOM) to control the control panel, which initiates a diagnosis mode by selectively providing alternative clock signals to the CODEC and disabling processor inputs, allowing component-by-component diagnosis through user interaction and test patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the control panel includes a CODEC to receive audio signals from the processor, then the audio selection and output capability is expanded, but the complexity of the system increases making error source diagnosis difficult
Solution Approach 1:
The patent segments the audio signal path into distinct testable sections by introducing a test signal input that can independently stimulate the CODEC, speaker, and interconnections. This allows error diagnosis to be performed on individual segments rather than requiring system-level testing, thereby reducing the effective complexity for troubleshooting while maintaining the expanded audio capabilities.
2Adaptability or versatility
If the control panel includes a CODEC to receive audio signals from the processor, then the audio selection and output capability is expanded, but the difficulty of detecting and measuring error sources increases
Solution Approach 1:
The patent introduces a test signal input as an intermediary device that mediates between the external testing equipment and the internal audio components (CODEC, speaker, interconnections). This intermediary provides a controlled test signal that isolates specific components for diagnosis, making error source detection straightforward without affecting the normal expanded audio functionality.
3Reliability
If components are interdependent in the control panel, then the system can function integrally, but unnecessary replacement and maintenance costs increase due to inability to isolate faulty components
Solution Approach 1:
The patent implements preliminary diagnostic action by providing a test signal input that allows pre-repair identification of faulty components. By enabling component-by-component testing through this dedicated test interface, the system maintains its integral functionality while allowing technicians to preliminarily identify which specific component (CODEC, speaker, or interconnection) is faulty before performing any replacement, thereby avoiding unnecessary replacements and reducing maintenance costs.
Data Source
AI summary
An example image forming apparatus includes a control panel and a processor. The control panel includes a liquid crystal display, a touch screen, a microcontroller, a multiplexer, a coder-decoder, and a speaker. The processor is to control the speaker. Based on a selection of a diagnosis mode, the microcontroller is to interrupt the control of the output of the speaker by the processor, change a state of the multiplexer, and perform a diagnosis by controlling the speaker to output a sound based on receipt of an input on the touch screen.