120 Service Manual
10 System Troubleshooting
3. Assembly Parts
Install all replaced parts in the ultrasound system by fastening all necessary screws. Meanwhile,
ensure there are no screws left and the ultrasound system is in the original cable routing.
Otherwise, interferences may result.
4. Take a Simple Test
Take a simple test with a reference to Chapter 8 after you replace all failure parts. If the
ultrasound system is connect to a server, ensure all images can be backed up to the server. Ensure
all images can be displayed normal and available in all working modes, such PW/CW/4D.
Moreover, adjust contrast and brightness of the monitor or other imaging parameters, such as
dynamic range, grayscale or gain, based on the user’s needs.
10.3.4 Post Maintenance
10.3.4.1 Inspection after Critical Parts Replacement
The ultrasound system mainly consists of keyboard, touch screen, power supply, computer system
and ultrasound module. It is very important to ensure the full connections among these parts.
Therefore, you should check the connections both before and after servicing the equipment.
Keyboard
Ensure all keys, knobs, switches and trackball work normally after you re-install the keyboard.
Touch Screen
Ensure the touch screen is not squeezed by any frames and frames are installed without any
deviations. Ensure all probes, all imaging modes or keys are available after the replacement.
Probe Board
The probe board serves as the important transmission channel between the probe and the front
end, it is connected to the VBF board by J1. The probe board transmits ultrasound signals and
probe codes, connects the power supply by J2 and provides power for relay and other parts.
Connection failure between J1 and VBF board may result in strikes on the diagnostic image or
even probe detection failure. J2 connection failure may result in probe detection failure.
Main Board
The main board is the control center of the ultrasound system, any failure part or connection
may result in system malfunction. Ensure power supply socket, RAM and hard disk SATA are
connected well. Any failure of the above parts, especially serial cable between the ultrasound
system and touch screen, may result in system startup failure, auto shutdown, no video output,
and/or other system malfunctions.
CPU fan is an easily worn out part, ensure it can work well when the ultrasound system is
running.
Ultrasound Unit
The ultrasound unit consists of VBF, VHV and probe boards, processes most signals and time
sequence. Ensure all boards in it are connected well, especially the following items.
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