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Cordless phones and conducted by 48/45MHz FM-band duplex communication between hosts, host and code on the phone does not, generally speaking, may be the host or transmit channels or receive mobile phone channel does not normally cause. This troubleshooting need some special instruments, such as the field strength meter, frequency, ultrahigh frequency Millivolt meter and high frequency oscilloscope and other amateur under these instruments are generally not complete, can only use existing instruments according to repair.ZRYservice manual download site
Observed that the machine code during phone on standby "for coding/third-party" button, the LCD screen has "used" flashing red "used" lamp does not light. When the host of "code/tripartite" key, on their red phone "used" light lit, instructions in code during phone is receiving the signal is in a State of the host. This also shows hosts launch of channel and receiving channels of the mobile phone is normal, no code because the host does not receive a cell phone signal, then the problem is a transmission channel of the mobile phone or the receiving channel.
According to the features of cordless telephones, generally speaking the phone's fault to some more, common symptoms include:
(1) the cell phone battery is not full, battery failure;
(2) caused by external impact or fall touch circuit board fault or poor, check the battery voltage is 3.8V, press the call key end voltage has dropped significantly, indicating battery properly. Open Mobile phone check, no anomaly. After host signal combined with mobile online "use" phenomenon of light, which has entered the launching State, repaired, if not for high frequency devices such as Oscilloscopes, signal strength meter Assistant examination, you can roughly guess its normal channel launch, so focus on overhauling hosts receive channels.
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