Philips M2540 color ultrasound repair

The Philips Envisor C (M2540A) ultrasound diagnostic system is based on Philips' unique traditional technology, combined with ATL's HDI and Agilent/Hewlett-Packard's SONOS technology. It offers an optimal combination of performance, ergonomics, and data management, and currently holds a significant share of the mid-range color ultrasound market in China. Its superior price-performance ratio has also been widely praised by customers.

I. Principles and Structure of the Philips M2540:

Structurally, it is mainly divided into two parts: the left side is the internal computer section (Internal PC), and the right side is the electronic box section (E-box). The electronic box mainly includes the TR board, BPAP board, APIO board, Demod board, Connector Modules, and Distribution board, etc.

(1) PC: The M2540A uses a general-purpose PC to replace the specialized control circuit boards in previous ultrasound systems. The power switch on the front of the PC is the system's power switch; pressing the PC's power switch starts the M2540A ultrasound system. The internal PC includes the following standard configurations: motherboard, hard drive, image acquisition card, acoustic processing board, 3.5-inch floppy drive, CD-RW drive, and CPU temperature monitor, etc. The PC driver supports monitoring the physiological module of the ECG; the module is connected to the PC motherboard via a USB cable. The MOD driver allows images to be acquired on removable disks for research and reporting.

(2) TR board: The M2540A contains two transmit and receive boards (TR), each with two connectors. One plugs into the motherboard, and the other plugs into the distribution board via the motherboard. These two TR boards are responsible for transmitting and receiving ultrasound signals. Each TR board has 64 transmitters and 64 receiver channels. It allows the system's 64 excitation channels to be multiplexed to a 128-element array. Each receiving channel contains a time-gain amplifier (TGC), a low-pass filter, a decimal analog-to-digital (A/D) converter, and an eighth-order digital beamforming circuit. The TR board transmits the sum of 18-bit values on its 32 channels to the output bus; the other TR board transmits the final RF data to the modulator board. The ultrasound transmission and reception lines are coordinated by the BPAP board. The BPAP board generates time-triggered signals to start and end each working line, sends the transmission signals to the TR board, and finally to the transducer via the distribution board and module connector. The analog driver generates the RF data to be sent. The digital timer delays the time of each analog driver; it receives the appropriate delay value from the BPAP board for each channel, while the system power controls the amplification of the transmission waveform.The received ultrasound signals undergo pre-amplification, time-gain amplification, low-pass filtering, and then digital processing.

(3) BPAP board: The BPAP board (Beam processor/acoustic processor) contains two processors. One controls beamforming, and the other is responsible for processing scan conversion/color blood flow and Doppler signals. The BPAP board provides an interface for communication between the PC and TR, PC and modulator board, processes the control data from the PC into specific values and transmits them to the TR board, detects the connection status of the ultrasound transducer, and allows arbitrary activation among the four transducers. The BPAP board can also control the high-voltage output of the system power supply.

(4) APIO board: The APIO board (Acoustic processor I/O) is the interface between the system PC and the electronic box. It is responsible for processing the data transmitted by the three buttons of the foot pedal via the input/output panel and then sending it to the PC. The APIO board is also responsible for generating trigger signals for the standard printer. In addition, the APIO board is also responsible for processing some signals from the PC, such as physiological module signals, power switch signals, BPAP board startup signals, and ultrasound image display signals, etc.

(5) Modulator board: The modulator board (Demodulator board) is responsible for image processing and Doppler modulation for B-mode, M-mode, PW, CW, and color blood flow modes; it transmits the reference data stream to the BPAP board.

(6) Connector Modules: The Connector Modules provide an interface and communication channel for the transducer and transmit and receive trigger signals for the TR board to the transducer.

II. Common Troubleshooting and Repair of Philips M2540:

(1) Fault phenomenon: Blue screen on startup, displaying "Windows/system32/config/system is lost"; system configuration file is missing. The M2540 uses Microsoft's Win XP operating platform; this phenomenon indicates an operating system malfunction. After reinstalling the software, the fault is resolved.

(2) Fault phenomenon: The ultrasound probe detection area shows bright and dark stripes or white spots; sometimes it's one probe, and sometimes all probes. This phenomenon indicates a malfunction of the transmit/receive channels on the TR board. The difference in the fault phenomenon is due to different degrees of channel damage. In severe cases, the system cannot Enter the operation interface after startup, and the screen prompts "The instrument detected an internal error and is collecting information to help diagnose the problem." Depending on the severity of the fault, replacing one or two TR boards resolves the issue.(3) Fault phenomenon: About 15 minutes after startup, the screen prompts "E-Box temperature exceeds the normal level." First, check whether the air dust filter is clean and whether the fan behind the air dust filter is running. After inspection, the power supply fan was not working. Because it was under warranty, replacing the power supply resolved the issue.

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