Cateye EC-3600, EC-3700 service manual 2No Display of Cadence

Applicable Models: EC-1200 EC-1600 EC-3600 EC-3700

T-2	No Display of Cadence (The cadence remains at zero (0) and does not count when the pedal is rotated.)
	Check Method of Causes	Repair Method	Explanation Figures
[1] Checking the Control Unit
1. Turn off the power. Loosen the four screws on the handlebar		The case of no short-circuiting
stem to remove the control unit.
				Black Cable
2. Remove the cable connector which is connected to the back of		The case a short-circuiting is found. One zero (0)
control unit.
		is detected during one rotation of the pedal.
					5
3. Slowly rotate the pedal while measuring the resistance across				4
				3
the connector terminals 1 and 2 of the 5P cable. (Fig. 1)				2
				1
t	When there is one short-circuiting (resistance becomes	Replace the control unit with a brand new one.
	zero) during one rotation of the pedal, the control unit is
	defective.
When there is no short-circuiting, proceed to the following check				Terminal 2
procedures.			Red Cable	Terminal 1
[2] Checking the Main Unit
1. Remove the frame cover. (See the Section D-1 and D-2

"Removing the Frame Covers.")			5P Cable
		Fig. 1
2. Remove the CN-3 connector on the power supply board. (Fig.
2)			Power Supply Board
3. Slowly rotate the pedal while checking shortcircuit across the			The case of no short-
two terminals of the CN-3 connector by using a tester to see if
			circuiting
there is one short-circuiting during one rotation of the pedal.			The case a short-circuiting is
(Fig. 3)
			found. One zero (0) is detected
t If short-circuiting is found, the 5P cable which connects the	Replace the 5P cable.	(See the Section ES-2	during one rotation of the pedal.
			Black Cable
power supply board and the control unit is defective.	"Replacing the 5P Cable.")
When there is no short-circuiting, proceed to the following check
procedures.
[3] Check the positional relation between the CDC sensor and the
magnet of the large gear. (Fig. 4)			Red Cable
1. Align the line on the CDC sensor with the center of the CDC
			CN-3 Connector
magnet. (Fig. 5)
2. Secure a gap of about 2mm between the surface of the CDC		Fig. 2	Fig. 3
sensor and that of the CDC magnet. (Fig. 5)			Gap of 2mm between CDC Sensor and CDC
Check if there is any short-circuiting in the CN-3 connector again.
			Magnet
t When a short-circuiting is found, the positional relation			Line on CDC Sensor
between the CDC sensor and the CDC magnet of the large
gear is incorrect.			Line on CDC Sensor
t When there is no shortcircuit, the CDC sensor is defective.	Replace the CDC sensor.	(See the Section ES-5
	"Replacing the CDC Sensor".)

Ce	nter of CDC Mag	net	Center of CDC Magnet
Fig. 4			Fig. 5

Cateye Ergociser Series 1000 Service Manual

T-2No Display of Cadence

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