TROUBLE SHOOTING

Circuitboard with CPU

The circuitboard together with the CPU (microprocessor) are the lawn mower’s “brain“ and handle all functions, commands and path selections the lawn mower decides on, based on the input data provided by the keyboard, sensors, solar panels, microswitches (collision detectors) and the batteries charge status.

To check whether an operating disruption is due to an error in the microprocessor start by resetting it 3 times (preceded by charging in daylight for at least 1 hour). That is, remove and reconnect one of the batteries connectors 3 times, allowing 5 seconds to elapse in between.

Also check that the fuses on the circuitboard have not blown and that they make good contact in the fuse holders. Replace fuses carefully.

The voltage between the fuses and the earth can also be measured and should be the same as the actual battery voltage. (The main power switch in position “1“.)

If this does not solve the problem you can try replacing the microprocessor with a microprocessor that you know functions correctly. The processor must be lifted out using the processor tool, otherwise there is a large risk of damaging the processor pins.

NOTE! All work on or in connection with the circuitboard must take place with the batteries disconnected to avoid short circuiting. Static electricity can also damage the microprocessor.

When trouble shooting, a microprocessor with the article number 535 04 90-01 can be used, all have the code “A 00000 B“. This microprocessor shall only be used for trouble shooting and repair work.

All other trouble shooting (in addition to replacing the circuitboard) consists of checking that connectors and cables are connected correctly on the circuitboard, even dampness and dust can result in faults, which is why cleaning with a dry brush and drying indoors can solve basic problems with short circuiting. Ocular inspection can also reveal the reason for a fault.

Buzzer

The lawn mower has a buzzer on the outside of the box that generates a beep, which the machine uses to interact with the user. The buzzer's volume can be adjusted using B0 - B9, where B9 gives a louder signal and B0 mutes the buzzer. If these setting have no effect on the volume, try replacing the buzzer. Connect 12 V DC to the buzzer to check whether it functions; it should sound.

There is also a buzzer on the circuit board, which has a fixed volume. If you wish the machine to be completely silent this must be blocked. This is done by pressing silicon into the hole on the top of the buzzer. Note this will also mute the beep heard when pressing the keys.

Main power switch

The main power switch ensures that the lawn mower does not start when it is switched off. The code must be entered in the lawn mower every time the main power switch has been switched off, even some commands are reset (see the Opera- tor's Manual). Note that the switch does not cut the voltage from the batteries and solar cells. Accordingly, the batteries' connec- tion cables should be disconnected when working inside the box and during the winter storage period.

The main power switch can be checked by measuring its resistance. The resistance should be 0 ohm respective infinite resistance depending on the position of the switch.

Magnetic switch

The magnetic switch is located by the hinge between the front and rear solar panel halves and ensures that the lawn mower does not start until the rear solar panel has been lowered.

The magnetic switch can be checked by putting the power switch in the “on” position and then lowering the rear solar panel. When this is done a click should be heard from the relay on the circuit board and the machine indicates “start-up” (1 beep/second) for 10 seconds. If you hear this the magnetic switch functions correctly.

If the “start-up” does not start, temporarily strap the connection screws on the magnetic switch. If the “start-up” now starts the magnetic switch is defective.

For information on how to replace the magnetic switch refer to service notice tab 5, 96.016.

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Hayter Mowers 101 88 90-26 manual Circuitboard with CPU, Buzzer, Main power switch, Magnetic switch
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101 88 90-26 specifications

Hayter Mowers has long been synonymous with quality and innovation in the realm of lawn care, and their 101 88 90-26 model epitomizes this legacy. Designed for the discerning gardener and professional landscaper alike, this mower combines cutting-edge technology with robust features to enhance your mowing experience.

One of the standout characteristics of the Hayter 101 88 90-26 is its powerful engine. Featuring a reliable Briggs & Stratton motor, this model provides ample power to tackle various grass conditions, from lush lawns to tougher terrains. The engine is designed not only for performance but also for efficiency, minimizing fuel consumption while maximizing output.

Another defining feature of the 101 88 90-26 is its cutting width. With a generous 26-inch blade, this mower can cover large areas quickly, reducing the time spent on mowing without compromising on the quality of the cut. The precision-engineered blades ensure a clean cut, promoting healthier grass growth and a more attractive lawn.

The Hayter 101 88 90-26 also boasts an adjustable cutting height system, allowing users to customize the grass length according to their preferences. With a range of settings, the mower adapts effortlessly to different types of grass and yard conditions, whether you prefer a close cut for a formal garden or a longer length for a more natural look.

Durability is another hallmark of Hayter mowers, and the 101 88 90-26 is built with robust materials designed to withstand the rigors of regular use. The steel chassis not only adds to the mower's longevity but also contributes to its stability during operation, ensuring a steady and balanced performance.

Technologically, this mower is equipped with an intuitive starting system that minimizes effort and enhances user experience. The easy-start feature means you can get to work quickly without fumbling with complicated mechanisms.

The mower’s ergonomic handles are adjustable and designed for comfort, reducing strain during extended use. User-friendly controls further enhance the operation, making it an ideal choice for both novice users and seasoned professionals.

In summary, the Hayter Mowers 101 88 90-26 is a powerful, efficient, and versatile lawn mower that combines advanced technology with user-friendly features. Its robust construction, adjustable settings, and ease of use make it a worthy investment for anyone looking to achieve a pristine lawn.
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