CATEYE TOMO CYCLOCOMPUTER

Mounting to Bike

Diagrams illustrate components and steps.

1. Ensure spokes run correctly through the inside of the magnet (as shown in Fig. 8).
2. Attach the sensor with Sensor Bands-A and B to the right fork. Choose a band that fits the fork diameter (S size for up to 24", L for oversize).
3. Insert band-B into the slit of band-A, and place the rubber pad inside band-A (Fig. 9). Adjust the length so the screw-fastening parts of the bands are parallel when mounted to the fork (Fig. 10).
4. Mount the adjusted bands to the fork along with the sensor, temporarily tightening the screw (Fig. 11).
5. Align the magnet's center with the sensor's marking line (Fig. 12), ensuring approximately 2mm clearance between the magnet and sensor (Fig. 13). Then, tighten the screw securely. Cut any excess of band-B.
6. Secure the wire with tape as shown in Fig. 14. Wind the wire around the outer cable and adjust length, ensuring slack for handlebar operation.
7. Use 1mm or 2mm-thick pads if necessary, according to handlebar diameter. Attach the bracket close to the handlebar stem (Fig. 15).
8. Slide the main unit onto the bracket from the front until it clicks into position. To remove, pull it off forward while pushing down the lever (Fig. 16).
9. Test: Mount the main unit. If the main display shows no figures, press either the M button or S/S button to release from power saving mode. Spin the wheel to check if the sensor pulse symbol flashes. If not, adjust the relative positions of the magnet and sensor following the instructions.

Diagrams referenced: Fig. 8 (Magnet on spoke), Fig. 9 (Band assembly), Fig. 10 (Parallel band alignment), Fig. 11 (Sensor on fork), Fig. 12 (Magnet/sensor alignment), Fig. 13 (2mm clearance), Fig. 14 (Wire routing), Fig. 15 (Bracket on stem), Fig. 16 (Unit attachment/release).

How to Replace the Battery

Turn the main unit over, remove the battery case cover with a coin, and insert a new lithium battery (CR1620 or CR1616) properly with the (+) pole upward (Fig. 17). Close the cover securely.

Important: Please make sure to perform the "All Clear" operation after replacing the battery, and to set the unit again.

Diagram referenced: Fig. 17 (Battery insertion).

Button Functions

Diagrams illustrate button locations and operations.

• M button (Fig. 1): Changes the display in the order shown in Fig. 1, with data displayed on the sub-display. If held for over 2 seconds, the 12-hour clock appears.
• S/S button: Starts and stops the measurement of trip distance and elapsed time. During operation, the speed scale symbol flashes. This button is invalid in Auto Function.
• SET Button: Used for setting the wheel circumference and clock time, switching the Auto Function on/off, and clearing all present data or irregularities. When pressed in a stop state in each mode, the following can be revised:
  • In ODO mode: Wheel circumference
  • In clock mode: 12-hour clock
  • In TM, DST or AVS mode: Auto function on/off

Reset Operation (Fig. 2): Select any mode except ODO, then press the M button and S/S button simultaneously. MXS, AVS, DST, and TM will reset to zero. (When done in ODO mode, the registered wheel circumference will be displayed.)

All Clear Operation (Fig. 3): When the M button, S/S button, and SET button are pressed simultaneously, all stored data (ODO, speed scale, wheel circumference, and clock time) is erased. All displays illuminate, then the mile/h symbol illuminates. This should only be executed after replacing the battery or when irregular display occurs due to static electricity, etc. Since all memories are erased, set necessary data again according to "Main Unit Preparation".

Diagrams referenced: Fig. 1 (Main Unit Components and Buttons), Fig. 2 (Reset Operation), Fig. 3 (All Clear Operation).

Main Unit Preparation

The following must be completed before operating:

1. How to measure wheel circumference (L) of your bike (Fig. 4): Put a mark on the tire tread and ride the bike for one full wheel revolution. Mark the start and end of the revolution on the ground and measure the distance between the two marks. This is your actual circumference. Alternatively, the "Setting Values Cross Reference Table" provides approximate circumferences according to tire size.
2. Setting Speed Scale: Perform the "All Clear" operation. All displays will illuminate. Then, mile/h alone will be displayed (Fig. 5). Km/h and mile/h are alternately displayed with each press of the S/S button. Press the M button to set the desired speed scale (Fig. 6).
3. Setting the wheel circumference (Fig. 6): The standard wheel circumference of 216 cm for a 27" wheel is displayed. If using 216 cm without revision, press the M button; ODO will be displayed and 216 cm is set. For revision, press the S/S button to increase the number by one. To increase rapidly, hold down the button. When the desired number appears, press the M button. ODO will be displayed, and the desired number is set.
4. Resetting or changing the wheel circumference: Set the main unit to ODO mode using the M button, and stop it with the S/S button. Press the SET button. The stored number will flicker on the sub-display. Revise the number as desired according to instruction (3).
5. Setting the clock time (Fig. 7): Press the M button for over 2 seconds to select the clock mode, and stop it with the S/S button. Then press the SET button; minutes will flash. Press the S/S button to advance minutes by one. To advance rapidly, hold down the button. Set the time one or two minutes ahead of the current time. Then press the M button; hours will flash. Use the S/S button the same way. Press the SET button to complete time setting. When you press the SET button, the undisplayed seconds will turn to zero. For accuracy, set by a radio time signal.

Diagrams referenced: Fig. 4 (Wheel circumference measurement), Fig. 5 (Speed scale mile/h), Fig. 6 (Speed scale toggle and circumference setting), Fig. 7 (Clock time setting).

Measuring and Display Functions

• SPD Current Speed: 0.0(3.0) - 65 mile/h (27 inch) ±1 mile/h under 31 miles/h. This is always displayed on the main display and updated once a second.
• ODO Total Distance (Odometer): 0.0 - 9999.9 mile ±0.1 mile. This is continuously measured until the battery wears down or an "All Clear" operation is done. At 10,000 miles (km), it returns to zero and counting begins anew.
• DST Trip Distance: 0.00 - 999.99 mile ±0.01 mile. The trip distance from start to current point is displayed. With Reset operation, it returns to zero.
• TM Elapsed Time: 0:00'00" - 9:59'59" ±0.003 %. Elapsed time is measured from start to current point, in units of hours, minutes, and seconds. At 10 hours, it returns to zero and counting begins anew. With Reset operation, it returns to zero.
• AVS Average Speed: 0.0 - 65.0 mile/h ±0.3 mile/h. The average speed from start to current point is displayed within 27 hours 46 minutes 39 seconds (99,999 seconds) or 999.99 miles (km). If either is exceeded, "(.E)" is displayed and calculation ceases.
• MXS Maximum Speed: 0.0(3.0) - 65 mile/h (27 inch) ±1 mile/h. With Reset operation, it returns to zero and counting begins anew.
• 12-hour clock time: The current time is displayed by a 12-hour clock.

AUTO (Automatic Start/Stop) Function

This function switches the main unit to start or stop automatically, indicated by the AUTO symbol appearing on the screen, freeing you from pressing the S/S button each time.

How to switch on/off the Auto Function: In TM, DST, or AVS modes, this function switches on/off with each press of the SET button. When on, the AUTO symbol appears. With this function, it ceases measuring elapsed time during a stop. A 2-second delay may occur if the main unit is mounted to the bracket with this function on.

Power Saving Function

When the main unit is left without receiving any signal for 60-70 minutes continuously, the power supply shuts down, and the main unit will display only "( )" as the figure. By pressing the M button or S/S button, or by receiving a signal, this function is released.