Kenwood TK-230 Service Manual

TK-230/230(SC)ADJUSTMENT\lignmentMeasurement AdjustmentF a - .item Condition enlistsa |Unit |Terminal |Unit |Parts od Specifications/Remarks|. Setting 1) Write in freq’ designed withEEPROM writer.2) Connect DC 7.5V to thebattery terminal.Note1. Measure voltage atbattery terminal.2. Adjust voltage of powersupply to be 7.5V intransmitting.2. PLL lock 1) CH: Channel with highest | Voltmeter |TX-RX |TP1 vco |L3 K.M3.7V ADJ |+0.2 V, —O4Vvoltage RX FREQ’ (Rx) M2 3.5V ADJ |+0.2V2) PTT : ON L6 K,M 3.7V ADJ |+0.2V, -O.4VM2 3.5V ADJ |+0.2V3) CH : Channel with lowest Check 1.1V or more.RX FREQ’ (fat).4) CH : Channel with lowest 1.1V of more.TX FREQ’ (ft).PTT : ON .3. Frequency | 1) CH : Channet with lowest Freq‘ -| ANT Check FREQ’ of TX. | + 400Hzadjustment TX FREQ’ (ftv). counterPTT: ON Power meter4. Sensitivity | 1) CH : Channel with RX center |AFVTVM SP TX-RX |L6, 8, |SINAD MAX.FREQ’ (fam). Oscilloscope 9, 10See cate pistornon 80 or 16Q dummy load |> 500nV/54dBp/-53dBm =| 8Q. dummy AF VIVM |SSG MOD : 1kHz load 7SSG DEV : 3kHz Oscilloscope }Distortion meter |2) SSG output 0) S64 Check SINAD 12dB or more.: 0.28pV/—11dBal—118dBm 23} CH : Chaeck other channel ° © aSSSG output: 0.28nV/— 11dBaf—118dBm5. Squelch 1) CH : Channel with RX center | Oscilloscope SP TX-RX |VR6 | Set to threshold* adjustment FREQ’ (fram). Distortion point.SSG freq’ : frm meterSSG output AFVTVM: 0.35pV/-9dBp/-116dBmat 12dB SINADMONI : OFF2) SSG output : 12dB SINAD Check Squeich open.2 0.45nV/-114dBmat 12DB SINAD3) SSG output : OFF Squelch close.4) MONI : ON Sound appear.Note Close when MONI : OFF.Do not touch it normally.Squeich adjust VR6 is adjusted at threshold point.If it is readjusted the VR6, the squelch sensitivity is changed.61