(4)Push down the latch on the upper section of the fan unit to latch it.
Unlatched state Latched state
Push down the latch.
(5)Switch on the power, and make sure that no fan alarm condition does
not occur and that both fans are rotating.
1 If the fan unit has not been coupled with the main unit
correctly, the fans on the fan unit may fail to run even when
the power is switched on, or a fan alarm may be issued even
when the fans are rotating.
2 If a force stronger than usual is needed to couple the fan unit
with the main unit, check that the pins of the connector on
the base printed–circuit board are straight. Also check that
the base printed–circuit board has been inserted securely
all the way through.
(1)Dismount the fan unit by following the procedure described in Section
(2)Unlatch the fan.
(3)Dismount the fan (FAN2) at the right side (in the above figure) first,
then the one (FAN1) at the left side.
(4)Detach the fan connectors from the fan connector printed–circuit
Method for Replacing