Some magnets are more powerful than others. Also try sliding the sensor or magnet, one or the other, closer to the hub, or farther away. The sensor will not respond if too far from the magnet. Magnets and Magnet Alignment report this adīy and large, wheel magnets used in cyclecomputers are very ordinary, and may be interchanged from one brand to another. Some other units have a special procedure to "re-boot" the processor, usually by pushing all of the buttons at once. Genuine Cateye batteries, which are no longer available, came with a special little piece of thin plastic that can be inserted between the two batteries and then yanked out to establish contact cleanly. Many Cateye Solars have been discarded as defective, when they only need to have the batteries re-installed correctly. This is a particularly common problem with the Cateye Solar, which has very tight spring contacts and uses two small batteries that are a bit hard to install.
The unit may show all 8's, or random fragments of characters, or may come up blank. This can cause "garbage" readings to appear.
If the battery makes contact on a "bouncy" way, the irregularities of contact as the battery is pushed in can send confusing messages to the circuit. Ideally, the battery should make instantaneous, solid contact with its terminals, but in some cases, this is not so easy to do. Some units are a bit fussy about how cleanly power is restored. When the battery is replaced, power is restored to the computer.
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