Determine whether remote control receiver normal method of resolving programme

1) identification of remote control receiver

If the remote too close or remote control anti-theft system did not work, should consider whether the remote control receiver circuit is faulty. Determines whether the remote control receiver normal, common methods are as follows.

① Spectrum Analyzer receiving antenna close to the receiver, to the anti-theft system (or remote control receiver) power, observed in the 200~400MHz within the band wave (adjustable volume) or gas (inductance) spectra of waveform. Such as a Spectrum Analyzer on the screen without any response, description receiver circuit faulty.

② use remote control transmitting signals, observed by oscilloscope receiver output (OUT), decode the input pulse signal output circuit. Due to different data signals that are sent, their waveforms for pulse width different combinations of strings, such as wave waveform was not unusual or logging, description remote control receiver section is defective.

③ Oscilloscope observation remote control receiver signal output, with metal objects touch remote control receiver antenna transmission of persons end clutter of oscilloscope should have a stronger reaction, otherwise description receiver part is faulty.

④ remote control transmitting signals, block measuring signal output voltage of DC voltage with multimeter, when you press the remote control button, the output voltage changes, in the absence of any response, description receiver circuit faulty.

(2) the remote control receiver determination of fault location

Once remote control receiver circuits are not working properly, you can distinguish fault from which part of the circuit as follows, that is, from upgrading a circuit is high level grade, super zoom, shaping circuits.

① When you check the amplifier, plastic circuit, signal/output points are lost people find the critical points of failure. Specific method is with remote control launches signal, with oscilloscope observation zoom, and plastic circuit has no signal entered (as LM385F of ⑤ feet), as has signal waveform, description high level circuit, and Super again rose circuit basic normal, fault in zoom, and plastic circuit; as measuring does not to signal, is fault in Super again rose circuit zhiqian: on zoom, and plastic circuit of check, can measurement LM358 of introduction feet voltage, and and normal controlled, if does not normal, more for IC itself damaged.

② for Hyper-up overhaul of the circuit, you can first check the DC voltage of the transistor, if not normal, check the DC bias circuit or transistor itself. DC bias voltage is normal, check AC feedback circuit, chip capacitors it is best to use the Replace method to examine.

③ for maintenance of high frequency amplifier circuit, check first check the DC operating point of high-level pipe after coupling components are generally not difficult to isolate the failing component.

Is the received frequency offset from the highest failure rate, mostly because of water or stop oscillation circuit board damp Super up circuits. Car alarm system with receiver, both the inductance and the adjusting volume, whether discrete direct plug-in is a surface mount devices or mixed mode, almost entirely between them used interchangeably, if we can find the GND (ground), +V (Power), OUT (output signal) corresponds to the end of the relationship, and resize the receiving frequency of the receiver.

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