Kendro HERAcell 150, Operating Instructions Manual

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HERAcell
®
, HERAcell
®
150 and HERAcell
®
240, Main PCB Replacement
6
3. Main PCB Replacement
3.1 Disconnecting the Device from the Mains Power Supply
1. Switch the device off at the main power switch.
2. Unplug the mains power cord and secure it to prevent accidental reconnec-
tion.
3.2 Removing the Main PCB
1. Remove the circuit box cover.
2. Remove the interface retainer screws.
3. Remove the Philips head screw on mains inlet connector.
4. Unplug the orange plug-in connector (X2 – X10) for the mains power circuit
on the PCB.
5. Disconnect the two door switch leads from terminal block JP2. To do this,
press on the spring terminals with a small screwdriver.
6. If installed, disconnect the four water level sensor leads from terminal block
JP1. To do this, press on the spring terminals with a small screwdriver.
7. Unplug the bus cables at the plug-in connections (JP3 / JP4 / JP 15). Press
the lockinng hook on the connectors to release.
8. Disconnect the two CO
2
solenoid leads from terminal block JP5. To do this,
press on the spring terminal with a small screwdriver.
9. If installed, unplug the air pump leads at connector JP 11. Press the
lockinng hook on the connectors to release.
10. Unplug the green/yellow ground wire at the PCB.
11. Using a Philips head screwdriver, remove the PCB retainer screws (7
screws).
12. Remove the main PCB from the circuit box.
3.3 Installing the New PCB
1. Install the new PCB in the reverse order to the removal instructions given in
Section 3.2.
2. An electrical safety check must be performed after electrical components
have been removed / installed.
3.4 Restarting the Device
1. Plug the mains power cord into the mains inlet connector.
2. Switch the device on at the mains power switch.
3. Resume normal operations.