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5.4.3 A4 POWER FILTER BOARD REPLACEMENT – For units 257 & 307
WARNING: This kind of board is fit with power capacitors which can keep electrical and can be dangerous even
after switch off.
Procedure:
1) Before replacing the board A4, make sure that the unit is switched off.
Check also on A4 board that “Charge” LED
- red - is Off.
2) Disconnect completely all wires and connectors from the board.
3) Remove the PCB from the spacers
4) Install the new board on the electrical plate and connect it while respecting wiring diagram.
5) Start the unit and check its correct operation.
« Charge » LED
Spacers
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