9. Re-install the screws to hold down the sensor cover.
º
WARNING
Verification of calibration response is required; otherwise,
the instrument will not perform as required, and persons
relying on this product for their safety could sustain serious
personal injury or death.
Main Electronics Board Replacement
º
CAUTION
Before handling the circuit boards, ensure you are properly
grounded; otherwise, static charges from your body could
damage the electronics. Such damage is not covered by
the warranty. Grounding straps and kits are available from
electronics suppliers.
1. Turn OFF the power.
2. Remove the battery pack.
3. Remove the pump cover or calibration cap, if installed.
4. Remove the sensor cover and sensors.
5. Remove the four remaining case mounting screws from the
back of the case.
º
CAUTION
When removing the back of the case, be careful not to pull
the pump wires from the connector. Use minimum force
necessary to disengage this connector to prevent breakage.
6. Remove the pump connector.
7. Disconnect the pump outlet tube; place a small, flat
screwdriver at the base of the tube and gently pry the tube
away from the barb.
8. Tilt the circuit board up at a 90 degree angle to gain access to
the connectors on the under-side of the circuit board.
9. Remove the display ribbon cable by sliding out the locking
tabs on the side of the connector.
10. Remove the membrane switch ribbon cable by sliding out the
locking tabs on the side of the connector.
Chapter 6, Warranty, Maintenance and Troubleshooting Operating Manual
6-10
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