Removal and Replacement Procedures
LCD backlight (
B029999 and Below). You must separate the LCD assembly from
the frame to change the LCD backlights.
1. Disconnect th
e two backlight cables from the Inverter board.
2. Remove the four T-10 screws securing the LCD assembly to the frame.
3. Pull the LCD assembly away from the frame, taking note of the routing of
the backlight cables.
4. Remove each of the backlight tubes by pressing down on the clip and pulling
it from the LCD assembly. (See Figure 5-3 on page 5-9.)
NOTE. Avo
id touching the LCD backlight tube. Oil from the fingers can cause
hot spots and premature failure. If you do touch the backlight tube, clean it with
isopropyl alcohol before reinserting the tube into the instrument.
5. When reassembling, make sure to route the backlight cables as noted in
step 3, behind the Front Panel standoffs and clear of the cutout for the
USB/Headphone connectors.
WFM6120, WFM7020, and WFM7120 Waveform Monitors Service Manual 4–37
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