Kenwood TK-390 Service Manual

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Contents

TK-390TK-39069 70LEVEL DIAGRAMReceiver SectionTransmitter SectionFM IFSYSTEML210 IC200–96.0dBm–90.5dBm –104.5dBm –113.5dBm –104.5dBm 240mVrms310mVrmsC85 L205Q200 Q201–121.0dBm–112.0dBm–99.5dBm–104.5dBmANTXF300/XF301C304 Q302 C308 IC601 (2/2)*5 4 3 41IC607I5 O5IC603DACAFAMP500mW(BTL)SPIC1IC604 (2/2)*232mVrms 330mVrms97mVrms800mVrms 27mVrmsI4 O4IC603DAC*EMC12 LPF13ALC COMPSWIDC 69 8191815 16C66120.5mVrms17.0mVrms15.5mVrms38.0mVrms320mVrms 310mVrms 300mVrms 450mVrms 115mVrmsMIC(MAIN)IC3NC AMP IC607 IC605 (1/2)* VCOIC10PLLC42–0.3dBmQ5 Q6 Q8C45RX LOD7+4.1dBm +8.3dBm +10.5dBmC59 C69ANT4.0WPowermoduleRF (470.0MHz)RF (470.0MHz)AFAFAFIF (44.85MHz)IF2(455kHz)L216 L218C49To make measurements in the AF section, con-nect the AC level meter. (ANT input : –47dBm,1kHz FM, 3kHz DEV.)In the RF section, use a 1000pF coupling ca-pacitor. (The display shows the SSG input valuerequired to obtain 12dB SINAD.)AG is set to the MIC input becomes 3kHz DEV.at 1kHz MOD.To make measurements in the AF section, con-nect the AC level meter.In the RF section, use a 1000pF coupling ca-pacitor.CN No. Pin No. Name I/O FunctionTX-RX UNIT (X57-5400-10)CN400 1 CH D I CH switch data.2 CH A I CH switch data.for 3 CH C I CH switch data.X53 4 CH B I CH switch data.(B/6) 5 E – GND.6 VOL I Voltage level input for audio control.7 5CM – 5V.8 B+ – Power input after passing through the fuse.9 B+ – Power input after passing through the fuse.10 SB – Power output after power switch.11 SB – Power output after power switch.12 TOGGLE I Normally : 5V, switched toggle whenconnected GND.13 KEY2 I Key input.14 Q6 O Key scan IC Q6 signal output.15 Q7 O Key scan IC Q7 signal output.16 LCDCS O Chip select output for LCD driver.17 CLK O Clock data output for LCD driver.18 DAT O Data output for LCD driver.19 LAMP – Backlight LED control.Normally : 0V, Lighting : 7.5V20 TXLED – TX LED control.Normally : 0V, Lighting : 7.5V21 BLED – Busy LED control.Normally : 0V, Lighting : 7.5V22 5M – 5V.CN401 1 TCONT O For optional board. (See page 22.)2 OPPTT O For optional board. (See page 22.)for 3 AMPSW O Audio AMP control switch output.X53 4 EXAFC O External speaker switch control.(A/6) 5 INAFC O Internal speaker switch control.6 KRS O Key scan IC reset output.7 KCK O Key scan IC clock data output.8 SOD – Not use.9 KEY1 I Key input.10 KEY2 I Key input.11 LCS – Not use.12 PTT I PTT signal input.13 N/CSW O Noise canseler microphone switch output.14 NC – Not use.15 CLK O Clock data output.16 DAT O Data output.17 E – GND.18 SB – Power output after power switch.19 SB – Power output after power switch.20 5M – 5V.21 MICE – MIC GND.22 MIC I MIC signal input.23 AF O Audio output.24 AFE – Audio GND.25 AFE – Audio GND.CN No. Pin No. Name I/O Function26 SP+ I BTL input + for external speaker.27 SP– I BTL input – for external speaker.28 MUTE O Audio mute signal output.29 SD TO O For optional board.30 MAN D O For optional board.31 LAMP O Backlight LED control.Normally : 0V, Lighting : 7.5V32 Q7 O Key scan IC Q7 signal input.33 Q6 O Key scan IC Q6 signal input.CN402 1 AFE – Audio GND.2 AFE – AUdio GND.CN403 1 SSW I EXT/INT speaker switch input.2 SP+ O BTL output + for external speaker.3 SP– O BTL output – for external speaker.4 MSW I EXT/INT MIC switch input.5 EMC I External microphone input.6 ME – External microphone GND.7 PTT I External PTT input.8 PF I Programmable function key input.9 NC – Not use.10 E – GND11 5M – 5V.12 TXD O Serial data output.13 RXD I Serial data input.14 NC – Not use.CONTROL UNIT (X53-3780-XX) (A/6)CN1 1 Q6 O Key scan IC Q6 output.2 Q7 O Key scan IC Q7 output.for 3 LAMP I Backlight LED control.X57 Normally : 0V, Lighting : 7.5V4 MAN D I For optional board. (See page 22.)5 SD TO I For optional board. (See page 22.)6 MUTE I Audio mute signal input.7 SP– O BTL output – for external speaker.8 SP+ O BTL output + for external speaker.9 AFE – Audio GND.10 AFE – Audio GND.11 AF I Audio output.12 MIC O MIC signal input.13 MICE – MIC GND.14 5M – 5V.15 SB – Power output after power switch.16 SB – Power output after power switch.17 E – GND.18 DATA I Data input.19 CLK I Clock data input.20 NC – Not use.21 N/CSW I Noise canseler microphone switch input.22 PTT O PTT signal output.23 LCS – Not use.24 KEY2 O Key output.25 KEY1 O Key output.TERMINAL FUNCTION