S6 Portable Digital Color Doppler Ultrasound System
Service Manual
Operating Problems: continued from previous page
Problem
Symptoms
Suggested Solutions
System crashes
frequently and
gain knobs are
not working.
System crashes frequently.
Sometimes gain poten-
tiometers are not working
in real time diagnostic
mode.
It’s most likely caused by the DBHV board
malfunction.
System crashes
frequently.
The system crashes fre-
quently.
The keyboard is not re-
sponsive.
Small vibration can cause
the system crash to a black
screen.
Check for any bad connections between the
DBF board and the Motherboard.
Check the cables attached to the DBHV board.
Dark Image
The screen turns dark
abruptly accompanied by
abnormal noise. Dark-
ened screen appears after
restart.
Connect an external VGA monitor. If this
monitor shows darkened screen, a faulty
DBHV board probably caused this problem.
Dark Image.
Blood flow is
poorly resolved.
The diagnostic images, as-
sociated with the high fre-
quency probes, are dark.
The C344 and 2P1 images
are dark while in the THI
mode. The blood flow is
poorly resolved even in the
duplex modes with CFM or
DPI.
It’s most likely caused by the malfunction of
the DBHV board and the DBTR board.
Real time image
has poor resolu-
tion.
In a diagnostic mode the
near field information is
not shown, the far field is
poorly resolved.
It’s most likely caused by the malfunction of
the DBHV board and the DBTR board.
No real time im-
age
No ultrasound images
sometimes.
It’s most likely caused by the malfunction of
the DBHV board and the DBTR board.
Dark image
No color flow
Unable to increase the B
mode gain. The ultrasound
image, including the near
field, is extremely dark.
Putting the system in CFM
or PW mode seems to bring
no change.
It’s most likely caused by the malfunction of
the DBHV board and the DBTR board.
Color artifacts
Color artifacts appear for
some probes: L741 and/or
2P1.
It’s most likely caused by the malfunction of
the DBTR board.
Dark bands arti-
facts
Dark bands in symmetrical
pattern appear on real time
images.
It’s most likely caused by the malfunction of
the DBTR board. However, a faulty probe
board (MPC board) is also known to cause the
same problem.
No echoes No echoes detected.
If other probes are working properly on the
system, replace this one.
Dark bands arti-
facts while mov-
ing probes
Dark bands appear while
moving the probes.
If other probes are working properly on the
system, replace this one.
continued on next page
P/N: 4720-0034-01A
10-10
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