Three Cases of Toshiba SSA-580A Ultrasound Repair

The SSA-580A color Doppler ultrasound diagnostic system is Toshiba Medical's top-of-the-line product in its 5-series, the NemioXG (SSA-580A), launched in 2007. It incorporates classic imaging technology and patented technologies from Toshiba's flagship products. The product uses a new generation of digital platforms, and its powerful data management capabilities provide comprehensive clinical applications. Compared to other machines in the same class, it is more compact, making it easier for users to move it between departments, and it is therefore favored by a wider range of clinical personnel. With increasing years of use, various malfunctions have gradually appeared in this model. This article analyzes and summarizes three malfunctions and their repair processes for this machine.

Malfunction One

1.1 Malfunction Phenomenon

The machine starts up normally, but there is no echo in the image after entering the ultrasound work interface.

1.2 Malfunction Analysis and Troubleshooting

The absence of ultrasound images is a typical malfunction encountered in ultrasound machines from various brands. Generally, the reason for this malfunction is that the machine has no high-voltage output or the front-end board responsible for ultrasound image processing has malfunctioned. It was initially judged that the A43 FETX board and the A60 ETXR2 board might be faulty. The A43 FETX board is a transmitting and receiving board, and the A60 ETXR2 board is a high-voltage board responsible for managing the probe's high-voltage output. After replacing the A60 ETXR2 board, the machine started up normally, and the echo area in the ultrasound work interface was restored, and it operated normally.

 Malfunction Two

2.1 Malfunction Phenomenon

The Toshiba SSA-580A fails to start up.

2.2 Malfunction Analysis and Troubleshooting

Ultrasound machines generally fail to start due to power supply, motherboard, or system problems, with power supply failure being more likely. After disassembling the SSA-580A machine, it was found that the power supply was located at the bottom of the machine. After passing through the 220V AC switch, the mains power is connected to the AC power board. This board converts the voltage via a transformer before supplying power to the DC power board. The DC power board converts various DC voltages and connects to the chassis motherboard. The motherboard and other boards are all plugged into the motherboard. The normal startup process is as follows: 1. Turn on the 220V AC switch, and after the mains power is connected, the voltage is converted via the AC power board and the DC power board. At this time, the 5V standby circuit on the motherboard works. 2. After pressing the machine switch next to the control panel, the motherboard starts working, and other +3.3V, +/-12V, etc., DC circuits start working, and the machine starts running. Using a multimeter to measure the output of the 220V AC switch section, the reading of 221V was normal and stable. Measuring the output voltage of each connection line from the DC power board to the motherboard, it was found that the +5V standby voltage output was normal. This initially indicated that the machine's power supply was working normally. After replacing the motherboard, the machine started and ran normally, and the fault was resolved.

Malfunction Three

3.1 Malfunction Phenomenon

The Toshiba SSA-580A fails to start up.

3.2 Malfunction Analysis and Troubleshooting

Upon arrival on-site, it was learned that the machine's failure to start occurred after a thunderstorm with lightning strikes. A bright flash was clearly visible at the rear of the machine. This indicated that the machine might have malfunctioned due to excessive current from a lightning strike because the building did not have a lightning rod installed. The power supply was the most likely cause of failure. Because the hospital staff said that a bright flash was clearly visible at the rear of the machine, it was estimated that the power supply fuses might have blown. There are two fuse tubes, FUSE1 and FUSE2, on the AC power board. After opening and removing them, it was found that the fuses were intact. After opening all the outer casings of the chassis, the power supply section was checked by replacing the boards and measuring the output voltage. Using a multimeter to measure the voltage from the 220V AC switch output to the AC power board, the reading was normal. The voltage reading at the two connection points of the transformer and the AC power board were both 114V. After replacing the transformer and AC power board, the voltage readings were similar, basically confirming that the machine's AC power supply was normal. The AC power board and the DC power board are connected via two interfaces. The reading of the 2-pin interface was 222V, which satisfies the power supply requirements for the DC power board to function. At this time, measuring the +5V power supply line interface connecting the DC power board to the motherboard, it was found that the voltage reading of this interface was 0, indicating that the machine's standby circuit had not entered the working state. After replacing the DC power board, the machine started and ran normally, and the fault was resolved.

Summary

To repair an ultrasound machine, one must have a certain understanding of the machine's structure and operating principles. Then, combining the malfunction phenomenon, analyze the possible causes of the failure, carefully checking during the repair process to determine the exact cause of the failure. Avoid blind repair to prevent the scope of the fault from expanding.

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