Sega WaveRunner GP - Manual (Page 111)

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DISPLAY DRIVE BD ERROR: E3H
CAUSE The Down Limit Switch is not changed to ON.
COUNTERMEASURES Ensure that the Ride is down fully or the connector of ASSY Wire
Tube is connected securely. (Section 6)
DISPLAY DRIVE BD ERROR: E4H
CAUSE The Up Limit Switch is not changed to ON.
COUNTERMEASURES Ensure that the Ride is up fully or the connector of ASSY Wire
Tube is connected securely. (Section 6)
DISPLAY DRIVE BD ERROR: E7H
CAUSE The pressure of the air tank is not sufficient.
COUNTERMEASURES Be sure of the compressor's function or the air leakage.
DISPLAY NO DRIVE BOARD
CAUSE The connection of the Drive Board is not correct.
COUNTERMEASURES Ensure that the connectors inside of the front cabinet are connected
securely.