Contact Board that makes contact with the cell and applies the high voltage. There are two contacts, one contact provides the voltage for the ionizing wires, the other contact provides the voltage for the collector plates. The two voltages are with respect to the chassis ground. The high voltage values vary based on the Hi to Lo control panel settings.
The red wire connects to the contact labeled ION (ionizing wires) and is powered with up to 8000 vdc. The black wire connects to the contact labeled COL (collector plates) and is powered with up to 4000 vdc. These black and red wires are feed by the high voltage circuit board F859-0387.