Fukuda Original Three-prong Power Interface Board with Ground Wire Switch for

Product Specification

Fukuda CardioMax FX-3010 ECG Three-prong power interface board including ground wire switch button PCB-6353A-C1 E133379 

Brief Introduction

The PCB-6353A-C1 is a relatively small but functionally integrated printed circuit board. It is typically located at the power inlet on the back or side of the electrocardiograph (ECG) machine, serving as the first bridge connecting the external AC power supply to the internal switching power board. It features a three-pin power connector with a grounding switch button, allowing the use of standard three-pin power cords for easy connection and replacement.

The board incorporates a mechanical switch controlled by a button, which is connected to the machine's casing or chassis via a dedicated grounding wire (green or yellow-green).

Operating Principle: When the power cord is plugged into the socket, the grounding pin of the power cord presses down the button, closing the switch and forming a complete circuit. This circuit is typically connected to the device's main power switching circuit or microprocessor.

Safety Purpose: This is an important safety interlock mechanism. Its function is to ensure that the device can only be powered on and started normally when the grounding terminal of the power cord is reliably connected. If the power cord is unplugged, or if a power cord without a grounding pin is used, this switch will trip, and the system will interpret this as a "poor grounding," preventing the device from powering on or generating an alarm during operation. This significantly reduces the risk of electric shock to patients or operators due to leakage current from the device casing.

Electromagnetic Interference Filtering:

In more complex versions or similar designs, these power interface boards may also integrate an EMI filter. It consists of a simple LC network of inductors and capacitors, used to filter out high-frequency interference noise from the mains power supply, while preventing switching noise generated internally from feeding back into the mains. This ensures that the weak ECG signals (typically only a few millivolts) acquired by the ECG machine are not interfered with by external power supply noise, guaranteeing clear and accurate waveform recording.

Specification

Troubleshooting and Maintenance

As a component that is frequently plugged in and unplugged and carries current, the PCB-6353A-C1 may experience the following common problems:

1. Loose Power Connector: Frequent plugging and unplugging may cause fatigue of the internal metal spring contacts, resulting in poor contact and intermittent power outages.

2. Grounding Switch Failure: Damage to the mechanical button or the switch itself may prevent the device from powering on even when a properly grounded power cord is plugged in because it cannot detect grounding.

3. Blown Fuse: This is the most common fault, usually caused by external voltage surges or internal short circuits. Replacing the fuse with one of the same specifications is the first troubleshooting step.

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