GE MEDICAL SYSTEMS PROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3 LOGIQ™ 9 PROPRIETARY MANUAL
7-74 Section 7-13 - Troubleshooting TiPs
7-13-4 Image Artifacts
Image artifacts can be caused by any of the boards on the Front End. Artifacts are frequently due to the
Front End Power supply or TD board failures. It is important to use the Diagnostic tools on the service
interface to try to narrow down the failure to one or two boards. On Logiq 9 the “loop back” adapter is
not necessary.
• Check FEPS voltages. You can visually check the LED status on the FEPS. If any of the leds are
not lit, the power supply is defective. Run Diagnostics on the Power Supply to check the voltages
and the tolerance. Check them with a scope as well look for possible high ripple. If this is the case,
replace the FEPS.
• M12L Mux In Handle probe has shown some artifacts that look like a dark vertical line or lines that
start at the bottom of the image. If this is the case, replace M12L probe. Refer to Service Note
70303 for more details about this problem.
• Artifacts that look like white vertical lines, rain or snow cones in one or more areas of the image can
be troubleshot in different ways:
- One troubleshooting technique is to swap TDs around to see if the artifact moves. (Pulling out
the boards will keep the system from booting up; all the boards must be present for the system
to operate)
- Another approach is to run the Visual Channel Utility to establish which channel the artifact
affects. A channel is a signal path formed by XDIF, RF, Top Panel and TD board. Any of these
boards in the path can be causing the failure. For instructions about troubleshooting
Diagnostics, refer to 7-7-4-4 "Board Level EBM Diagnostics" on page 7-26.
- Be aware that the problem may only appear with one mode, probe or preset. Normally, in B-
Flow the problem becomes more evident and may be easier to troubleshoot.
- Check all the probes on all the ports. Remove all the probes, and then check each probe
singly in every port.
* If port-related, replace Connector board.
* If the artifact only occurs with one probe, replace probe.
* If the problem persists with the new probe, reload software. Do not reload presets until
you have tested the system with the default settings and be sure that the problem does
not persist. User Defined Presets can carry corruption back to the system.
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