Kenwood TK-7102H Service Manual

Also see for TK-7102H: Specification Instruction manual Service manual Service manual

Contents

16TK-7102H ADJUSTMENTTransmitter Section1. Frequency 1) CH : TX center Frequency counter ANT PC key Adjust to center frequency Within ± 100Hz2) Transmit2. High 1) CH : TX low Power meter 50W ±1.0Wpower CH : TX low’CH : TX centerCH : TX high’CH : TX high2) Transmit3. Low 1) CH : TX low 25W ±1.0Wpower CH : TX low’CH : TX centerCH : TX high’CH : TX high2) Transmit4. DQT 1) CH : TX low (Wide) Modulation analyzer Adjust the waveform as belowbalance CH : TC center (Wide/Narrow) or Linear detectorCH : TX high (Wide) (LPF : 3kHz)2) Transmit Oscilloscope5. MAX 1) CH : TX low (Wide) Modulation analyzer ANT ± 4.0kHz (Wide) ±50Hzbalance CH : TC center (Wide/Narrow) or Linear detector MIC ± 2.0kHz (Narrow)CH : TX high (Wide) (LPF : 15kHz) According to the large +, –2) AG : 1kHz/50mV Oscilloscope3) Transmit AG6. MIC 1) CH : TX center (Wide/Narrow) AF V.M Check ±3kHz±0.2kHzsensitivity 2) AG : 1kHz/5mV (Wide)3) Transmit ±1.5kHz± 0.1kHz(Narrow)7. DQT 1) CH : TX low (Wide) Modulation analyzer ± 0.75kHz (Wide) ±0.05kHzdeviation CH : TX center (Wide/Narrow) or Linear detector ± 0.35kHz (Narrow)CH : TX high (Wide) (LPF : 3kHz)2) Transmit Oscilloscope8. QT 1) CH : TX low (Wide) ± 0.75kHz (Wide) ±0.05kHzdeviation CH : TX center (Wide/Narrow) ± 0.35kHz (Narrow)CH : TX high (Wide)2) Transmit9. DTMF 1) CH : TX center (Wide/Narrow) ± 3.0kHz (Wide) ±0.2kHzdeviation 2) Transmit ± 1.5kHz (Narrow)Item Condition Test equipment Terminal Parts MethodSpecifications/RemarksMeasurement AdjustmentIf normal power is not obtained, please follow thestep belowOpen the shielding cover (upper), and screw 3 locationsaround ANT pin.1. Switch off the transceiver.Impedance of Final FET (Q101) and Drive FET (Q800) canbe measured easily using DVM Ω mode.Normal condition – Gate : 2MΩ~, Drain : 20kΩ~50kΩThe above impedance values are rough estimations.2. Switch on the transceiver. Check the voltage at R888(fuse) output point.The voltage is around 13.6V in receiving condition. Thevoltage will be 12.6V~ in transmitting condition. If found0V at this point then R888 (fuse) is broken.3. Remove R224.4. Connect 50Ω load at the ANT location.Transmit and check current drain at High power mode.If the current drain is less than 1A, then Final FET is bro-ken.If the current drain is less than 5.0A, short the Drive FETgate to ground, and check the current drain.If the current drain is not 0.1A less than the original value,then the Drive FET is broken.5. Check input power level at Drive FET gate location.Connect the wire to [RF] location.Transmit and check for power to be within the range of0.3W~0.6W.If power found is less than 0.3W, check the circuit beforethe Drive FET.