Replacing The Backplane Board - Ametek Thermox CG1000 User Manual

Replacing the Backplane Board

7-12 | Thermox CG1000 Oxygen Analyzer
Disconnect the power cord from the analyzer when servicing sys-
tem components. High voltages are present inside the analyzer when
power is applied.
The furnace insulation cover and furnace are extremely hot, even after
power has been removed from the analyzer. Use caution and wear ap-
propriate gloves if removing the furnace insulation cover to access the
furnace.
1. Disconnect the power plug from the analyzer.
2. Remove the cover.
3. Remove tubing from U5 and U4.
4. Remove the wires from TP2 (Cell + and T/C + and T/C -)and TB1 (AC,
AC).
5. Remove J3, J4, J5, J6 and J7 connections.
6. Remove the front panel and flow knob on the front panel.
7. Remove the power supply and display modules (see the applicable
section in this appendix for help).
8. Remove the two screws on the solder side of the backplane board
(where the backplane board is connected to the chassis).
9. Take a screwdriver and loosen the screws on the bottom and top of
power supply module connector on the backplane board (where
power supply/keypad module goes into the analyzer).
10. Slide the backplane board over to the right until the screws are disen-
gaged, then remove the backplane board from the analyzer.
11. Retrieve the new backplane board (PN 80464SE).
12. Reverse the above steps to install the new backplane board.
13. Recalibrate the analyzer.