81
Scanner
®
2000 microEFM Section 5
18. Recalibrate the Scanner 2000 and replace the enclosure cover.
Important Do not overlook the need to recalibrate the Scanner 2000. Boards that are shipped inde-
pendently of a Scanner 2000 are not calibrated to compensate for atmospheric pressure;
therefore, a Scanner 2000 will not display accurate pressure readings until it is recalibrated.
19. Re-establish power to the peripheral circuitry.
Keypad Replacement
!
WARNING: To prevent ignition of hazardous atmospheres, do not remove the cover while cir-
cuits are alive. The Scanner 2000 poses no hazard when opened in a safe area.
To replace the keypad of the Scanner 2000, perform the following steps:
1. Unscrew the cover of the enclosure counter-clockwise until it separates from the main body of the enclo-
sure.
2. Using a small standard blade screwdriver, remove the two #4-40 × 7/8” screws located to the right and
left side of the display (Figure 5.1, page 78).
3. Lift the display/keypad assembly from the enclosure.
4. Remove the two #4-40 × 5/16” screws fastening the circuit assembly to the keypad (Figure 5.3, page 80).
5. Disconnect the keypad ribbon cable from the J7 connector on the LCD side of the circuit assembly as fol-
lows:
a. Grasp the black clip between a thumb and forenger (Figure 5.4, page 80).
b. Squeeze both sides of the clip and gently pull to release the clip from the plastic connector that holds
it in place. DO NOT PULL on the ribbon cable. When the black plastic clip is properly disengaged,
the cable will release freely.
6. Remove the old keypad.
7. Connect the ribbon cable of the replacement keypad to the J7 connector on the LCD side of the circuit
assembly as follows:
a. Insert the end of the ribbon cable into the plastic clip.
b. While holding the ribbon cable in place, press the black plastic clip into the connector until it snaps.
8. Mount the circuit assembly to the keypad with the two #4-40 × 5/16” screws removed in step 4.
9. Mount the display/keypad assembly to the enclosure with the two #4-40 × 7/8” screws removed in step 2.
10. Recalibrate the Scanner 2000 if necessary.
11. Replace the enclosure cover and tighten.
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