Hitachi SJ300 - Manual (Page 37)

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5.7 Unit replacement
Unit replacement can be done without rewiring of the logic signal.
(How to exchange)
• Remove terminal cover.
‚ Reconfirm that the charge lamp is turned OFF.
ƒ Remove the screws, right and left portion , like following figure.
„ Plug out the logic terminal carefully.
… In case of plugging in to the new inverter, pay attention not to bend the connection pins.