Probe Type: GE Probe
Probe Model:Logig S8
Fault Phenomenon 1:
The device boots up normally. During probe usage, when loading color Doppler, the color image displays screen glitches, while the 2D image is normal. All 3 probes paired with the device exhibit color image screen glitches, as shown in Figure 1.
Figure1 Color Image Screen GlitchFault Analysis and Troubleshooting:When this fault occurs, we first consider probe failure. However, the probability of multiple probes failing simultaneously is low. To rule out probe failure, we tested one of the probes, ML6-15-D, on other GE general-purpose devices. The probe displayed normal color blood flow images on other devices, thus initially ruling out probe failure.After reinstalling the probe, considering that system software problems might also cause image screen glitches, we backed up the device's adjusted parameters and then performed a full format and software reinstallation. The fault persisted after the installation.Carefully observing the color screen glitch image, we noticed a pattern. A clear arc-shaped boundary appeared in the middle, a common occurrence during transmission and reception. Therefore, we suspected a front-end BF board fault. After removing the BF board, wiping it down, and inspecting it (no obvious abnormalities were found), we reinserted the BF board, restarted the device, and the device returned to normal.However, the same color screen glitch problem reappeared after a few days of use. After re-plugging the BF board and restarting the device, the fault still existed. After removing the BF board for inspection, we found irreparable looseness at the interface. We contacted the manufacturer to order a BF board, and after replacing the BF board, the fault did not reappear, and the device functioned normally.The trackball cursor jumps back and forth, and the device cannot be used normally.This device uses a photoelectric trackball. We first considered that the trackball photosensitive module sensor (Figure 2) might have failed or been obstructed by dust, paper scraps, etc. We removed the trackball, cleaned the internal dust, carefully cleaned the sensor surface, and inspected it, finding no obvious fault.After cleaning, we reinstalled the trackball and restarted the device, but the fault persisted. We opened the control panel, used the support rod to support the position (see Figure 3), refastened the trackball's power and signal cables, and restarted the device, but the fault still persisted.Figure 2 Trackball Photosensitive Module SensorFigure 3 Rod Support PositionTherefore, we can conclude that the trackball's photoelectric sensor component itself has failed and needs to be replaced. We contacted the manufacturer to order a trackball kit, and after replacement, the device functioned normally.The gain knob adjustment for B-mode and CF-mode is malfunctioning. Rotating clockwise increases the gain, while rotating counter-clockwise does not decrease the gain.
Figure 4 PW Mode Gain EncoderFault Analysis and Repair:Testing revealed that the M-mode and PW-mode gain encoders (Figure 4) on the device's control panel were functioning normally. We opened the control panel, removed the B-mode and CF-mode encoders, cleaned them carefully, and re-plugged them. After reinstalling the encoders and restarting the device for testing, the fault persisted.We installed the M-mode encoder in the B-mode and CF-mode encoder positions respectively. After powering on and testing, the switching was smooth and functioning normally. Therefore, the fault lies in the two encoders themselves. After replacing the two encoders, the device functioned normally.
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