Kenwood TH-22A Service Manual

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TX/RX Common AdjustmentTH-22A/AT/EADJUSTMENT. Measurement Adjustmentitem Condition Test Specifications/Remarksequipm Unit | Terminal; Unit | Parts Method1. Setting 1) Power supply @ 3) © Note)DC IN terminal: 6.3V BATT terminal: 6.0V2. Reset 1) While pressing the F key Display check. All segments on., down, set the POWER: ON.2) F key: Release Check the Reset frequency, 144.00PLL AdjustmentMeasurement AdjustmentItem Condition Test Specifications/Remarksequipment Unit {Terminal} Unit | Parts Method1. VCO voltage | 1) Frequency: Center frequency | Digital TX-RX | CV Check 1.25 to 2.8VReceive. Voltmeter2) Transmit (PTT: ON). 1.5 to3.2VTX AdjustmentMeasurement AdjustmentItem Condition Teste Specifications/Remarksequipment! Unit |Terminal] Unit | Parts Method1. Transmit 1) Frequency: 144.90MHz f.counter |TX-RX | ANT RFF | TCi 144.90 MHz + 500Hz or less.Frequency PTT: ON Powermeter2. Power output| 1) Max. power Power TX-RX | ANT |CONTROL VR201| Check. 5.5W or more.DC IN terminal: 10.6V meterFrequency: 146.00MHz: K,P,X, |AmmeterM1,M2,M3,M4,E2144.975MHz: M5,T,E1,£3,64,E9Power select: HIPTT: ON2) HI power Adjust to5.5W | +0.1WPTT: ON (Current consumption1.7A or less.)3) LOW power Check 0.3 to 1.0W.DC IN terminal voltage: 7.0V : (Current consumptionPower select: LO 0.8A or less.)PTT: ON4) EL power Check 10 to 300mWPower select: EL (Current consumptionPTT: ON 0.3A or less.)5) HI power Check 2W or more.Power select: HiPTT: ON6) Frequency: 144.00MHz and Check 2W or more.147.975MHz: K,P,X,M1,M2,M3,M4,E2145.975MHz:M5,7,E1,E3,E4,E9PTT: ON3. Modulation 1) Frequency: 146.00MHz: K,P, |Power TX-RX | ANT |CON- VR202| Adjust to +0.1kHzX, M1, M2,M3,M4,E2 |meter MIC |TROL +4,.2kHz at large144.975MHz:M5,T,E1,E3,E4,E9 |Linear deflect of +.AG output: 1kHz/50mV detector Check detection |Must be normal.PTT:ON Oscillo- waveform.2) AG Output: 1kHz/SmV AG Check DEV 2.2 to 3.5kHz(20dB down) ;PTT:ON AFV.M41