AirSep MN134-1 B - Manual (Page 20)

MN134-1 rev B
02/14
15
A green light that fails to illuminate indicates a disconnected or faulty solenoid coil or an
electrical malfunction in that valve circuit. The two vertical red lights indicate high and
low pressure.
Consult the troubleshooting chart in Section 6.0 to determine when to replace the printed
circuit board.
The Printed Circuit Boards (PCBs) contain components that are sensitive
to electrostatic discharge (ESD) and can damage the board if not handled
properly. As when handling any ESD-sensitive PCB, observe standard
ESD safety procedures.
5.7.1 Circuit Board Replacement
Circuit Board Removal
To remove the circuit board, follow the steps below:
1. Set the unit’s I/ 0 switch to the “0” position and disconnect the power cord.
2. Remove the side and back panels.
3. Disconnect the main power 10-pin connector from the circuit board.
4. Disconnect the alarm 6-pin connector from the circuit board.
5. Cut the tie-wrap at the circuit board pressure transducer and disconnect the
green tube from transducer.
Care must be taken when removing and installing tubing to circuit
board sensor to prevent damaging sensor.
6. Push in on the circuit board support tabs while you lift each area of the
circuit board to remove circuit board from the control panel.
Circuit Board Installation
To install the circuit board, follow the steps below:
1. Push the circuit board on to the support tabs.
2. Install green tubing to the top barb of transducer located on the circuit
board. Secure with the tie-wrap.
3. Carefully align and firmly install the 6-pin connector and the 10-pin
connector to the circuit board so that the connector’s tab locks securely into
place.
4. Reconnect the back and side panels.
5.8 Product Tank Replacement
Product Tank Removal
To remove the product tank, follow the steps below:
1. Set the unit’s I /0 power switch to the “0” position, and disconnect the power
cord.
2. Remove the sides, lower front, and back panels.
3. Remove the compressor. (Refer to Section 5.3.)