Sharp AH-PG21 Service Manual page 20

1) Remove the screw fixing the Receiving filter.
2) Remove the 2 Switch and Photo detector unit.
3) Remove a screw fixing the Cord holder.
2. The Electric Control box.
4) Remove a screw fixing the Cord holder and 2 screw
5) Remove 2 screws fixing the Transformer and pull the
Control board unit.
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fixing the Terminal board.