Kenwood TH-K4AT Service Manual

Also see for TH-K4AT: Instruction manual Instruction manual Service manual

TH-K4AT/K4E27ADJUSTMENTSingle Tone ModeThis mode is used to check the DTMF deviation.Operation■ 16key (M2 type)1. Press the [PTT] key on the transceiver to switch to thetransmission mode.2. Press the [MONI] key to enter the single tone mode.3. Press any key from [1] to [8] keys to transmit a single tone.The single tone is consisting of eight frequencies.[1] 697Hz[2] 770Hz[3] 852Hz[4] 941Hz[5] 1209Hz[6] 1336Hz[7] 1477Hz[8] 1633Hz4. When the [MONI] key is pressed again during thetransmission, the transceiver switches to the receptionmode, the single tone mode turns OFF.■ 4key (E type)1. Press the [PTT] key on the transceiver to switch to thetransmission mode.2. Press the [MONI] key to enter the single tone mode.3. When the [VFO] key is pressed during the transmission, aDTMF “D” dual tone (combination of 1633 Hz and 941 Hzfrequencies) is transmitted.4. When the [MR] key is pressed during the transmission,single-tone 1633 Hz is transmitted.5. When the [MONI] key is pressed again during thetransmission, the transceiver switch to the reception mode,the single tone mode is turned OFF.• The single tone mode can be enabled only during thetransmission.• When DTMF memory is transmitted in the single tonemode, the single tone mode turns OFF.Adjustment ModeThis mode is used to replace or readjust the IC15 (EEPROM).Adjust the following adjustment items after setting thetransceiver to “Adjustment Mode”.■ Adjustment ItemsA. Overvoltage warning reference voltage (14.8V [DC IN])B. Battery terminal reference voltage (7.5 V [Battery terminal])C. Squelch (SQL1, SQL2)D. S-meter (Two segments in S-meter light, all segments in S-meter light)E. RX BPF (Lower limit frequency, center frequency, upperlimit frequency)F. 7.5V TX H power (Lower limit frequency, center frequency,upper limit frequency)G. 7.5V TX M power (Lower limit frequency, center frequency,upper limit frequency)H. 7.5V TX L power (Lower limit frequency, center frequency,upper limit frequency)I. 13.8V TX H power (Lower limit frequency, center frequency,upper limit frequency)J. 13.8V TX M power (Lower limit frequency, center frequency,upper limit frequency)K. 13.8V TX L power (Lower limit frequency, center frequency,upper limit frequency)L. DCS modulation balanceM.Tone deviation (Lower limit frequency, center frequency,upper limit frequency)N. DCS deviation (Lower limit frequency, center frequency,upper limit frequency)O. VOX sensitivity (Level 1, level 9)■ Operation in Adjustment Mode1. Turn the transceiver ON.2. Set the tone frequency to 151.4 Hz and the DCS code to023 in Menu Mode to adjust tone and DCS modulation.3. Set Adjustment Mode by shorting two lands (SET) on thecomponent side of the TX-RX unit (A/3).4. When the Adjustment Mode is set, the “Overvoltagewarning reference voltage (14.8V [DC IN])” adjustment itemis displayed. (The “ ” icon on the upper side of the LCDblinks while the transceiver is in the Adjustment Mode.)The current adjustment value is displayed at the lower digitsof the frequency display, and the value stored in theEEPROM is displayed on the memory channel numberdisplay.5. The functions of transceiver keys in Adjustment Mode areas follows:Short these two landsSETAdjustment itemBlinkThe value stored in theEEPROM. (00-FE)Current adjustmentvalue (00-FE)