Problem Solver - Shimano Nexus Service Instructions Manual

Problem
The following problems can be discovered and solved by the customer fairly easily, such as
solver
cases of mistaken operation or wires that have become disconnected.
Speed display is incorrect.
Buzzer does not sound.
When automatic shifting is set,
the derailleurs cannot be
manually shifted.
The system does not start even
when the wheels are turning.
A unit does not operate, such
as one of the derailleurs.
The lamp for night riding does
not turn on.
If the problem is not solved by carrying out the suggestions above, reset the system by carrying out the
following steps.
• Resetting method
(1) Loosen the two screws at the side of the computer unit (AI-8S40) connector, and
remove the cover.
(2) Turn the shift timing adjustment dial to the "RESET" position, and leave it there
for 5 seconds.
(3) Return the shift timing adjustment dial to its original position, and then replace
the cover and tighten the screws.
* When the shift timing adjustment dial is moved to the "RESET" position, the cover cannot be
installed. The setting information will be retained even after the system is reset.
• If the problem is not solved after the system has been reset:
A problem with the FLIGHT DECK, Broken internal wiring, Malfunction of component that is not
operating
Ask an authorized bicycle dealer for repairs.
Condition
Tire circumference setting is incorrect.
Change the setting to the correct number.
The buzzer has been set to off.
Set it to on.
Manual shifting is disabled when automatic shifting mode is in use.
To enable manual shifting, change the mode to "MANU".
(* Manual changing of the suspension is possible when AUTO mode is set.)
When the system has not been used for a long period of time, it may
take several seconds or even half a minute to start the system. Ride the
bicycle in that condition for a short while.
If the system still does not start, check for broken wires, disconnected
wires or loose connections between the hub dynamo and the computer
unit and between the computer unit and the FLIGHT DECK.
Malfunction of the component or wiring problem
Check the wiring between the computer unit and the unit that does
i
not operate.
Fix any problems such as a wire that is disconnected, not fully
connected or connected to the wrong location.
Is the lamp set to OFF?
Check for broken wires, disconnected wires or loose connections between
the hub dynamo and the computer unit and between the computer unit
and the lamp. If there is no wiring problem, check that the light bulb has
not burned out.
Description
Reset position
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