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XIEGU G90 Maintenance Manual
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XIEGU G90 Maintenance Manual

Short-wave transceiver
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Document No.:
Short-Wave Transceiver Series
G90/G90S
Version: First Edition
Revision: 0
Revision Date: July 27, 2022
Maintenance Manual
Classification Level:
Confidential
Private and Confidential!
XIEGU

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alain LE DREZEN
April 20, 2025

Antenna tuner instable, pas d’accord possible Si je secoue le boîtier ça fonctionne et je pense à un mauvais contact interne?

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Summary of Contents for XIEGU G90

  • Page 1 Classification Level: Document No.: Confidential Short-Wave Transceiver Series G90/G90S Maintenance Manual Private and Confidential! Version: First Edition Revision: 0 Revision Date: July 27, 2022 XIEGU...
  • Page 2 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver Contents Page 2 of 48 XIEGU All Rights Reserved Version No.: 1.0 2022-07...
  • Page 3 Overview of the Whole Device G90/G90S is a short-wave transceiver with ZIF zero-IF structure, built-in automatic antenna tuner, and a transmitting power of 20W. The block diagram of each part of the whole device is as follows: Small signal board unit:...
  • Page 4 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver Display unit: Page 4 of 48 XIEGU All Rights Reserved Version No.: 1.0 2022-07...
  • Page 5 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver Base board unit: Basic skills of board-level maintenance: 1. Be familiar with the circuit structure of the whole device and accurately grasp its signal flow. 2. Be familiar with the status of each working voltage and be able to measure it accurately.
  • Page 6 G90/G90S Portable Short-Wave Transceiver  The head of G90 can be separated from its body, with hot swap supported. Therefore, in the maintenance process, this feature can be utilized to quickly locate whether the fault point is in the main unit or the head unit.
  • Page 7 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver Next, each circuit board will be regarded as a unit to explain the judgment, detection and maintenance of faults by categories in combination with common fault phenomena. Some fault phenomena have appeared to be the same on the single board and the whole device.
  • Page 8 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver Maintenance Method Fault Phenomenon Display Checkpoint Check whether the FPC pedestal is faultily welded Blank display Check whether there is any false welding at the MCU pins  This fault is mostly caused by the false welding of components.
  • Page 9 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver Fault phenomenon: It cannot be written into Bootloader or the application Maintenance Method Fault Phenomenon Display Checkpoint Check whether the voltage is 3.3V Failure to burn Check whether the MCU is program...
  • Page 10 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Fault phenomenon: no power for the hand microphone input, no action after hand microphone buttons are pressed, and no backlight at the hand microphone Maintenance Method Fault Checking Phenomenon Display Area...
  • Page 11 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Fault phenomenon: The device head cannot communicate with the host, and the screen displays COMM LOST Maintenance Method Fault Phenomenon Display Checkpoint Check whether the MCU pins communication are faultily welded and whether...
  • Page 12 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Fault phenomenon: The encoder does not respond when it is pressed Maintenance Method Fault Phenomenon Display Checkpoint Check whether the encoder The encoder does switch pins are faultily not respond when it H.J.K...
  • Page 13 At present, there are mainly two versions of small signal boards with large production volume, i.e. G90-SSIGBD-V2.0.7-GAI03 and the current version G90-SSIGBD-V2.1.1. The old version is the same as the current version in terms of principle, with only part of circuit units having been changed.
  • Page 14 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  We are to explain with the default test frequency point of The general parameters of each basic measurement point on the small signal board are as follows: 14.270MHz as an example. The maintenance test frequency point of each subsequent step is considered to be 14.270MHz by...
  • Page 15 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Fault phenomenon: It cannot be written into Bootloader or the application Fault Maintenance Method Phenomenon Small signal board Checkpoint 1. Check whether the 3.3V power supply is normal Inability to 2. Check whether the main...
  • Page 16 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver 1. First, check whether the local oscillator on the small signal board  Fault phenomenon: receive failure (or no signal tone) works normally. Instrument settings: Setting Parameters Name Parameter Parameter 1 Parameter 2...
  • Page 17 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver Amplitude Checkpoint Frequency Name mVpp Baseband 1kHz signal The frequency measured at the two test points at checkpoint A5 shall be 1kHz, and amplitude is basically the same (the allowable difference is within 10mV).
  • Page 18 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver Maintenance methods:  Fault phenomenon: BPF unit test fault (there is no amplitude-frequency curve in network 1. First check the band switching control area on the back of the small analysis test)

  • Page 19: Special Attention

    XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver The main manifestations of such faults are as follows:  Fault phenomenon: startup failure, unable to connect with the machine head (mainboard MCU  After starting up, the blue indicator light beside the main MCU indicator light flashes slowly and is always on) flashes slowly or is always on.
  • Page 20 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver The fault phenomena are as follows:  Fault phenomenon: no PRE function (after turning on PRE, the amplitude-frequency curve of During the network analysis test, turn on/ off the PRE function, and the...
  • Page 21 ATT unit Mainboard of the new version: For the mainboard of the new version G90-SSIGBD-V2.1.1, the fault is mainly caused by the damage of radio frequency switch AS179 or the abnormal control level of AS179. Check whether the control level can normally turn between high and low when it is in on/ off state of ATT.
  • Page 22 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver Maintenance methods:  Fault phenomenon: The receiving IQ balance cannot be adjusted The instrument settings are as follows: Setting Parameters Name Parameter Parameter 1 Parameter 2 Baseband Frequency: Amplitude: Signal Source amplifier 14.271MHz...
  • Page 23 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver Maintenance methods:  Fault phenomenon: IQ output amplitude is unbalanced (ellipse or a line is displayed) The instrument settings are as follows: Setting Parameters Name Parameter Parameter 1 Parameter 2 Frequency: Amplitude: Signal Source 14.271MHz...
  • Page 24 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Fault cause 1: Carrier suppression caused by transmission  Fault phenomenon: The suppression degree of transmission carrier cannot be adjusted/ no channel fault cannot be adjusted. transmission occurs Check whether the transmitting baseband amplifier, transmitting mixer and small transmitting transformer have welding problems such as The two faults have highly coincident inspection parts, so they are explained together.
  • Page 25 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver   Fault phenomenon: There is a bulge in the center of the spectrum display area Fault cause 1: IQ signal is unbalanced. The maintenance method is the same as that of the previous "Receiving IQ balance cannot be adjusted"...
  • Page 26 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Fault phenomenon: Earphones switch silently 1. Press the sound volume button on the machine head and measure the voltage at the checkpoint: Maintenance Method Fault Phenomenon Small signal board Voltage V...
  • Page 27 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Setting Parameters Fault phenomenon: There is no prompt tone for turning on or off the machine Name Parameter Parameter 1 Parameter 2 Y-axis: Oscilloscope Time base: 1ms X10 gear 100mV Under the receiving state, the condition of checkpoint A32 measured is...
  • Page 28 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver The instrument settings are as follows:  Fault phenomenon: The horn is silent Setting Parameters Name Parameter Parameter 1 Parameter 2 Frequency: Amplitude: Signal Source 14.271MHz -40dBm Y-axis: Oscilloscope Time base: 1ms...
  • Page 29 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver 1. Instrument setting:  Fault phenomenon: The hand microphone has no transmitting power Setting Parameters Name Parameter Parameter 1 Parameter 2 Function signal Frequency: 1 Amplitude: source 250mVpp Y-axis: Oscilloscope Time base: 1ms...
  • Page 30 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Fault phenomenon: Transmit when the machine is turned on (accompanied by a long prompt Maintenance methods: tone) Fault cause: CW pedestal is partially short-circuited  Check whether the pins of CW pedestal are short-circuited to the...
  • Page 31 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Fault phenomenon: There is no transmission power in the line input Check the welding of the following points: Maintenance Method Fault Phenomenon Small signal board Checkpoint The line input has Check whether there is any false...
  • Page 32 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Fault phenomenon: There is no wave band voltage output Check the welding of the following checkpoints: Maintenance Method Fault Phenomenon Small signal board Checkpoint There is no wave Check whether there is any false...
  • Page 33 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver Base board G90-BASEBD-V2.0.6 1. Observe whether the pins of the power input transformer are welded reversely. The output of the transformer should be the same winding  Fault phenomenon: The plug-in power line is short-circuited to the ground corresponding to the welding input, and cannot be connected in reverse.
  • Page 34 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Fault phenomenon: Short circuit at startup 1. Check whether there is continuous tin electrodeposit caused by the manual welding of components in each point: Maintenance Method Fault Phenomenon Small signal board...
  • Page 35 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Fault phenomenon: High startup current and abnormal operation of the whole device The fault is mainly caused by the abnormal switching of the transmitting and receiving voltages, which leads to the incomplete switching of the voltages of the two circuits.
  • Page 36 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Fault phenomenon: low startup current 1. Check the model of the two regulators to prevent wrong loading of materials. 2. Check the voltage at each point: Checkpoint Voltage V Name Internal 9V voltage Internal 5V voltage ...
  • Page 37 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Fault phenomenon: there is sudden change of current when the power amplifier is adjusted to Maintenance methods: static state 1. First confirm that the static current does have nonlinear changes (sudden changes) during regulation.
  • Page 38 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver 1. Disconnect the transmitting small signal line and press the hand  Fault phenomenon: during static current adjustment, the current does not change microphone so that the whole device enters the transmitting state.
  • Page 39 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Fault phenomenon: the power supply is short-circuited as soon as the transmitting starts (the Maintenance methods:  power supply exceeds 10A) Power off the whole device, and check whether the winding of the output transformer is short-circuited with the copper tube of the transformer.
  • Page 40 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Fault phenomenon: no power 1. Adopt the stage-by-stage signal inspection method to troubleshoot such faults. The signal measurement at each check point shall be as follows: Setting Parameters Name Parameter Parameter 1...
  • Page 41 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Fault phenomenon: no power in some frequency range (low power) General cause: the relay and coil of a certain filter are faulty. 1. Take the filter shown in the figure as an example, and pay attention to the input and output terminals in the figure.
  • Page 42 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver Fault phenomenon: the power of the whole section is small (only ≤ 10W)   Fault cause 1: this fault is generally caused by the reverse welding of the primary and secondary coils of the input transformer.
  • Page 43 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Fault phenomenon: power out of control (output exceeds 22W, and regulation is invalid) Maintenance methods:   Fault phenomenon: The standing wave of the variable capacitor cannot be adjusted to the...
  • Page 44 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Fault phenomenon: when switching frequency range, LPF relay does not act 1. The relay of each LPF frequency range is controlled by the control chip ULN2803 output . 2. Voltage of output control pin corresponding to ULN2803:...
  • Page 45 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Maintenance Method Fault Fault phenomenon: some sections of the transmitting spectrum are abnormal, with large stray Phenomenon Base board Checkpoint Check whether there is any pin Multi frequency connected to tin...
  • Page 46 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver  Fault phenomenon: antenna tuner failure (unable to adjust) 1. Check whether all chips, relays and coils in the antenna tuner unit are faultily welded. 2. Confirm whether the magnetic ring and number of turns of the antenna tuner coil are correct.
  • Page 47 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver Revision Record: Prepared/ Revised Version No. Revision Content Date Preparation for V1.0/A0 Yan Huan the first time 2022.07.27 Page 47 of 48 XIEGU All Rights Reserved Version No.: 1.0 2022-07...
  • Page 48 XIEGU Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver Temporarily ended. Page 48 of 48 XIEGU All Rights Reserved Version No.: 1.0 2022-07...

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