Check In Near Field Image - GE LOGIQ E9 Service Manual

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PROPRIETARY TO GE

5180483-100, R

Visual Inspection of Board (cont'd)

Transmit Channel (cont'd)

Figure 7-192 Check in near Field Image

A dark streak in the near field indicates either a defective Front Plane or the transducer itself has been

damaged. Save image to the clipboard, swap the Front Plane locations, reproduce the saved image and

compare. If images are the same, the transducer is bad. If there is one dark streak and it moved, the

Front Plane is bad. If two dark streaks appear, both the Front Plane and transducer are most likely

When Visual Inspection does not show Damage

There are two levels of impedance testing that can be performed to identify which GTX Board is

1.) Check resistance value from the HV FET switch section to ground. See

"Troubleshooting Step 1 - Upper Bank of HV FET Section (cont'd)." on page 7-290.

2.) Check resistance value from pin 6 via of each of the output transformers to ground. See:

"Troubleshooting Step 2 - Upper and Lower Transmit Bank" on page 7-292.

Always label the Front Planes and GTX Boards prior to removal. Remove GTX Boards one at

a time and perform the impedance checks in order, as detailed in the following pages.

Section 7-9 - Troubleshooting Tips

Troubleshooting