![]() It is infrequent to replace a probe PC board unless a non-waterproof probe has been submerged in fluids, in which case, you are likely going to be replacing the complete Probe. Like the Main Unit, the Probes are mostly sold as complete assemblies because the PC board would be exposed with a repair. Crystals are the fragile part of the doppler that will break when the doppler is dropped or struck. PROBE: A doppler probe is made up of a small PC Board, a Crystal assembly and a casing that will include the connection of the Probe to the PC board. It is a lot easier to isolate a problem with a removable coiled cable. Batteries are a source of many problems with dopplers, and rechargeable models generally run better with OEM batteries than aftermarket ones.ĬOILED CABLE: The cable between the main unit and the Probe will usually have a connector on both ends however, some dopplers are hardwired to the main unit and/or the Probe. POWER SOURCE: Most dopplers will run off of alkaline batties and get approximately 500 assessments out of one battery however, some models use AC adaptors and/or charging stands with a NiMH battery in the main unit. Inside the main unit, there is a PC board (usually a single PC board with all components printed/soldered together), a speaker, casings and batteries. MAIN UNIT: In recent years, most manufacturers have been restricted to only supplying parts that do not involve exposing the PC board, which means that aside from the batteries, the main unit of the doppler can be considered an assembly. A doppler is made up of only a few components, many of which are replaceable as a complete assembly. The key to troubleshooting a broken doppler is to isolate the problem to the components affected, and this is more simple than you might think. ![]() Hand-held dopplers are delicate instruments in a high-paced environment, and it is a commonplace to have these devices in the repair department due to some form of damage or failure.
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