ROLL-ROAD EMMA - User Manual

Questions and Answers

R
Renee HunterAug 3, 2025
Why is the continuous driving mileage not sufficient after charging my ROLL-ROAD EMMA Bicycle?
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  Daniel SmithAug 3, 2025
  Insufficient continuous driving mileage after charging your ROLL-ROAD Bicycle can occur due to several reasons: * Tire air pressure might be too low, so ensure you fill the tires adequately. * The cell might have low power, or the charger may be faulty, so fully charge the cell or replace the charger. * The cell could be aging or damaged, especially due to frequent climbing, strong headwinds, frequent braking, heavy loads. Replacing the cell may resolve this; also, changing driving conditions may improve the mileage.
K
Kerry JohnsonAug 7, 2025
What to do if the motor does not work after switching on the power supply of my ROLL-ROAD EMMA Bicycle?
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  jody81Aug 7, 2025
  If the motor of your ROLL-ROAD Bicycle doesn't work after switching on the power, it could be due to: * A loose cell connecting line. Reconnect it. * A damaged speed governing throttle. In this case, contact the distributor for a replacement. * A loose or damaged motor output line. Seek assistance from a repair store.
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kevinbaldwinAug 11, 2025
How to fix speed-governing fault or decreased max speed on my ROLL-ROAD Bicycle?
- R
  Ryan ClarkAug 12, 2025
  A speed-governing fault or decreased maximum speed in your ROLL-ROAD Bicycle can be caused by: * Too low cell voltage. Charge the cell. * A damaged speed-governing throttle. Contact the distributor for a replacement.
T
Tommy MillerAug 16, 2025
Why is the riding mileage not sufficient after charging my ROLL-ROAD Bicycle?
- K
  Kevin RichardsonAug 16, 2025
  If your ROLL-ROAD Bicycle's continuous riding mileage is insufficient after charging, several factors could be at play. First, check your tire pressure and inflate if low. A weak battery or faulty charger could also be the cause; try fully charging the battery or replacing the charger. If the battery is old or damaged, consider replacing it. Additionally, riding on rough terrain, facing strong headwinds, frequent braking, or carrying heavy loads can reduce mileage. Adjust your route, lighten the load, and use pedal assist to improve range.
A
Anne CarsonAug 20, 2025
What to do if the motor is not working on my ROLL-ROAD Bicycle?
- S
  Shawn HopkinsAug 20, 2025
  If the motor of your ROLL-ROAD Bicycle isn't working, the issue might stem from a loose cell connection. Try reconnecting it. Alternatively, the speed governing throttle could be damaged, in which case you should contact the distributor for a replacement. A loose or damaged motor output line could also be the culprit, and you may need to seek assistance from a repair store.
C
Cheryl MooreAug 25, 2025
What to do if my ROLL-ROAD Bicycle charger fails to charge?
- B
  Brian HillAug 26, 2025
  If your ROLL-ROAD Bicycle charger fails to charge, start by inspecting all connections to ensure they are properly connected. If the connections are secure, the fuse inside the cell box might be fused and need replacement. Another potential issue is a battery pack connecting wire falling off, which requires welding to reconnect the wires.
R
Ronald RussellAug 28, 2025
How to fix speed-governing fault on ROLL-ROAD EMMA Bicycle?
- C
  Christopher TaylorAug 29, 2025
  If you're experiencing a speed-governing fault or reduced maximum speed on your ROLL-ROAD Bicycle, it could be due to a few reasons. A low cell voltage is a possible cause, so try charging the cell. Another reason may be damage to the speed-governing throttle, in which case you should contact the distributor for a replacement. Also, the spring inside the throttle may be stuck or failed.

Summary

About Manual

Basic Specifications

Battery Pack Installation Guide

Notice for Battery Removal

Recommendations for removing the battery before assembling the e-bike for safety and ease.

Function overview and Functional areas

4.1 Functional overview

Details the features of the YL90T-H display, including battery level, speed, PAS, and more.

4.2 Functional areas

Diagram illustrating the different display areas and their corresponding functions on the YL90T-H screen.

4.3 Button definitions

Explains the function of each button on the operating unit for the YL90T-H display.

Routine operation

5.1 Power on;off

Instructions on how to turn the YL90T-H display on and off, including auto shut-off.

5.2 Display interface switching

How to cycle through different display modes like Odometer, Trip, Max Speed, and Average Speed.

5.3 Walk boost mode

Details on activating and using the walk boost mode for pushing the e-bike.

5.4 Turning on;off lights

Procedure to control the lights and adjust display backlight brightness.

5.5 PAS level selection

How to adjust the Pedal Assist System (PAS) level to change motor output power.

Personalized Parameter Settings

Display Configuration

Adjust display brightness, units (metric/imperial), voltage, auto sleep time, and PAS levels.

Performance Tuning

Configure wheel diameter, speed sensor magnets, speed limits, drive modes, and pedal assist sensitivity/strength.

Controller & System Settings

Set controller current limits, battery voltage cutoffs, cruise control, speed ratio, and reset trip odometer.

Shortcut operation

Restore Factory Settings

Procedure to reset all display parameters back to their original factory defaults.

Trip Odometer Reset

Detailed steps to manually reset the trip odometer on the display.

Wire connection diagram

Standard Wire Connection Sequence

Diagrams and table showing the standard wire sequence for display connectors.

Safety Checklist

Safety Precautions

Emma Use and Care

Safe Riding Practices

Essential advice for safe riding, including traffic rules and handling the e-bike.

Operational Guidance

Instructions on correct operation of driving, brakes, charger, and general bike handling.

Battery Care and Safety

Guidelines for battery charging, usage, storage, and critical safety warnings.

Check, cleaning and maintenance

Regular Daily Checks

A checklist for daily inspection of the bicycle's key components and systems.

Quality Assurance and After-Sale Service

Warranty Authentication Standards

Details the standards for replacing or not replacing e-bike parts under warranty.

Safety and Care Instructions

Maintenance

Battery Maintenance

Best practices for charging, using, and storing the e-bike battery to prolong life.

Chain Maintenance

Steps for cleaning and lubricating the bicycle chain for optimal performance.

Front Fork Maintenance

Procedures for cleaning and protecting the front fork to prevent wear and damage.

Brake Maintenance

Guidance on pad replacement, inspection, and regular checks for the disc brake system.

Riding Limitations

Online Resources

ROLL-ROAD EMMA Specifications

General

Brand	ROLL-ROAD
Model	EMMA
Category	Bicycle
Language	English

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