Mindray DC-68, Service Manual

Page: 229 / 281

Troubleshooting of Regular Malfunctions 13-5
13.3.3 Image Troubleshooting
No. Fault
Description
Cause Analysis Solution
1 No echo in
ultrasound
image. The
probe can
recognize but
provides no
echo.
PHV voltage output of power module is 0
V or abnormal;
Errors on TR64 board, DC-DC board or
probe board;
The possibility of error on
TR64 board is higher than
DC-DC board’s. The
possibility of error on the
probe board is lower.
Confirm the error by
replacing TR64 board,
DC-DC board or probe
board.
2 Dark strips
appear on B
image
Probe malfunction, e.g., array corruption,
etc.
Replace the probe to eliminate the error.
Replace the probe;
Observe the image. The dark strips are
fixed for different probes and sockets.
Replace TR64 board;
If the strip is not fixed well for a single
probe, the probe board may go wrong.
Replace probe assembly
3 Noise appears
in B image
Probe malfunction. Replace with different
probes to check the error.
Replace the probe;
Other electrical equipment in the voltage
is working, so that the probe may be
influenced by common-mode interference
on the floor;
Ripple-shaped interference signal
appears on the image
Confirm the cause of the
failure by turning off
electrical equipment of all
peripherals connected to the
system.