Mylar Insulator Kit

Installation Instructions for the LI-7000 CO₂/H₂O Analyzer

Some users of the LI-7000 CO₂/H₂O Analyzer have experienced intermittent keypad display problems (e.g. flashing, no numbers displayed, etc.), which have been traced to a short between two halves of a ribbon cable that connects to the keypad display. This problem may be more pronounced in very humid environments, where moisture between the ribbon cable can cause an electrical short. LI-COR can provide the 7000-904 Mylar Insulator Kit, which contains a small piece of mylar material (p/n 6570-044) that can be easily inserted between the two halves of the ribbon cable to correct the problem. The installation requires only a Philips head screwdriver, and takes about 15-20 minutes to complete.

Follow these steps to install the mylar insulator on the LI-7000 keypad:

1. Power the LI-7000 off, and remove the power cable.
2. Remove the Philips head screws on the top, left, and right sides of the instrument case. It is not necessary to remove the screws from the access panel. There are 8 screws on the instrument top panel, 5 on the left side panel, and 3 on the instrument right panel. Slide the instrument cover off toward the front of the instrument.
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3. Turn the instrument over and remove the 4 screws that secure the instrument front panel and keypad.
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4. Pull straight out on the four connectors; the front panel assembly can now be removed.
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5. Insert the mylar insulator between the two halves of the ribbon cable. Insert until the insulator is flush with the straight edge of the ribbon cable.
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6. Reattach the four cable connectors, and then reassemble the instrument front panel and instrument case.