7-10 | Dycor CG1100 Oxygen Analyzer
MCU Board
Removing the MCU board
1. Follow the instructions for removing the analog board.
2. Disconnect the 10-position RS-232 ribbon cable (P4) on the left-hand
side of the MCU board. See Figure 7-9.
3. Disconnect the 10-position RS-485 ribbon cable (P2) on the left-hand
side of the MCU board. See Figure 7-9.
4. Using a 1/4” nut driver, remove the four standoffs holding the board
onto the PCB bracket. Retain the standoffs and washers.
5. Remove the remaining LED ribbon cable (P5) located at the bottom of
the board.
(P4) RS-232 Connector
(P2) RS-485 Connector
Standoffs
P5 Connector
PCB Bracket
Figure 7-9. MCU Board and connectors.
Replacing the MCU board
1. Attach the LED ribbon cable (P5) to the bottom of the MCU board.
2. Using the four standoffs and washers, attach the board to the PCB
bracket with a 1/4” nut driver.
3. Reconnect the RS-232 (P4) and RS-485 (P2) cables on the left-hand side
of the board.
4. Follow the instructions for replacing the analog board.
