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5.4.4 HIC BOARD REPLACEMENT
Procedure:
1) Before replacing HIC board A4, make sure that the unit is switched off.
Check also on A3 / A4 boards that “Power” and/or “Charge” LED - red - are Off.
2) Disconnect completely all wires and connectors from the HIC board.
3) Unscrew the 2 fixing screws of HIC on its heat sink.
4) For units 155/157/175/177/195/197, unscrew the fixing screw of temperature senor.
5) Remove HIC.
6) Apply thinly and all over thermal paste on the socket of the new HIC.
Note: Diode bridge needs also thermal paste on its socket.
7) Install temperature sensor and §HIC on the heat sink with screws.
8) Connect the wiring.
9) Start the unit and check its correct operation.
Units 155/175/195
Units 157/177/197
HIC screws
Temperature
Sensor
screw
Units 257/307
HIC screws
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