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How to determine the remote receiver is not a normal job

 post:2015-03-20


How to determine the remote receiver is not a normal job

(1) identification of the remote receiver is not a normal job
If the anti-theft system, remote control intervals too close or remote base does not work, should consider the remote control receiver circuit is not defective. Job discrimination remote control receiver is not normal, common approach is as follows.
① the spectrum analyzer receiving antenna close to the receiver, to the anti-theft system (or a remote control receiver) Power in the 200 ~ 400MHz band should be investigated to wavy (tune capacitive) or pour gas-like (adjusted sense of style) spectrum waveform. If no repercussions on the spectrum analyzer screen, clarify receiver circuit faulty.
② transmission signal with a remote control, with an oscilloscope survey receiver output (OUT), the input of the decoding circuit of the pulse signal should be output. Because the data is not the same as the transmitted signal, the waveform is not the same as the combined width of the pulse train, if not normal or undetectable waveform waveform clarify some faulty remote control receiver.
③ survey oscilloscope signal output of the remote receiver, the receiver's remote control with a metal object touch the antenna input terminal, an oscilloscope should be more intense clutter response, or clarify some faulty receiver.
④ transmitter with a remote control signal, the DC voltage with a multimeter to measure the voltage signal output block, and when you press the remote control buttons, the voltage should change its output, without any repercussions, clarify receiver circuit faulty.
(2) remote control receiver site to determine fault
Once concluded remote control receiver circuit operation is not normal, it is possible to distinguish the following way illnesses from which some circuits from high-level radioactive level is, and then cut the circuit is still super expanded shaping circuit.
① View expanded when shaping circuit, the input signal I / O points is the key point to find fault. Specific measures are transmitting remote control signals, expanding investigation with an oscilloscope, shaping circuit without a signal input (eg LM385F of ⑤ feet), where the signal waveform, to clarify the high-amp circuit, super up another circuit simply normal, trouble expanding, plastic circuit; if no signal is detected, then the fault in the circuit before the super up again: the expansion, shaping circuit viewing, LM358 pin voltage can be measured and controlled and normal, if not normal, and more damage to the integrated circuit itself.
② ultra up again for maintenance circuit, it is possible to view the transistor DC voltage, if not normal, or view the DC bias circuit transistor itself. DC bias voltage is normal, and then view the communication response circuit for chip capacitors is best viewed with the substitution.
③ to expand the high-frequency circuit maintenance, but also to see the adoption of high level DC operating point after viewing tube coupling element approach is usually not difficult to find fault components.
The highest rate of the received frequency offset problems, mostly due to water or moisture circuit board circuit make up another super vibration caused by the suspension. Receiver with car alarm system, whether it is still a sense of style tune tune-contained, but also whether it is still a patch of discrete devices plug straight or mixed methods, scarcely able to use the exchange between them, simply find GND (Ground ), + V (power supply positive), OUT (output) side of the corresponding links and scratch adjust the receiver can receive frequency.

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Keywords:smart remote control technology
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