AirSep MN105-1 C - Manual (Page 27)

AirSep ® Corporation
NewLife ® Elite Service Manual
6 Connect the fan leads, and install the cabinet fan screws.
7 Reconnect the back and side panels.
5.7 Circuit Board Replacement
The solid-state printed circuit board controls the sequential timing operation of
the five solenoid valves and the alarm system functions. The five-green-light
matrix corresponds to the valve configuration of the NewLife unit. Two green
lights should always illuminate and rotate (cycle) during normal operation.
A green light that fails to illuminate indicates a disconnected or faulty solenoid
coil or an electrical malfunction in that valve circuit. The two red lights indicate
high and low pressure.
Consult the troubleshooting chart in Section 6.0 to determine when to replace
the printed circuit board.
CAUTION
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. These procedures include the
following:
 Handle the PCB by the edges only.
 Work on a grounded ESD mat.
 Wear a grounded wrist strap.
 Store PCBs only in anti-static bags.
5.7.1 Circuit Board Removal
1 Set the unit’s ON/OFF switch to the OFF position, and unplug
the power cord.
2 Remove the side and back panels.
3 Disconnect the main power 10-pin connector from the circuit
board.
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