Kenwood TK-390 Service Manual

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Contents

26TK-390SEMICONDUCTOR DATA / DESCRIPTION OF COMPONENTSControl Unit (X53-3780-XX) -12 : K -13 : K4Ref. No. Use / Function Operation / ConditionIC1 Audio power amplifier 0.5W/16Ω, BTL methodIC2 Decimal counterIC3 MIC noise canceling circuitIC4 Option board (MAND) AND circuitcontrol switch MAND : "H", OUT : "H"when Q8 port is "H"IC5 Option board (OPPTT) AND circuitcontrol switch OPPTT : "H", OUT : "H"when Q9 port is "H"IC6 Option board (TCONT) AND circuitcontrol switch MAND : "H", OUT : "H"when Q9 port is "H"IC101 LCD driverIC501 RF power amplifierQ5 AF AMP switch AF AMP SW "H" : onQ6 AVR AF AMP switch powersupplyQ7 Int. audio mute switch INT. AFC "H" : INT. SPaudio signal onQ8 Audio mute switch MUTE "L" : RX audiosignal off7. Active DBM : GN2011(TX-RX Unit IC200)7-1. Circuit diagramG1G2D1D2S2S16. VCO System : KCH41 (TX-RX Unit IC10)6-1. Circuit diagramC24C2C23R8D5L6D9 C22C8D4D3D8C9C19L7C15L8C10R7L10C11Q2C12L9R5C13R6C14Q5L12Q4R12R3L5C4C6C7R10C16R9L11C17Q3L4R2C5Q1C3L3C21C1L2C18D7D2D1D6L1C201234MOD–VGNDCV87654CTX/RXGNDFoRef. No. Use / Function Operation / ConditionQ14 N/C switch N/C switch "H" : N/C onQ15 Ext. audio mute switch EXT AFC "H" : EXT. SPaudio signal onD2 AVR AF AMP power supplyD6~9 Key pad backlightD11 Reverse current preventionfor number key padD12,13 Reverse current preventionfor PF key.D14 Reverse current preventionfor number key padD15,16 Reverse current preventionfor PF key.D17,18 Reverse current preventionfor number key padD19,20 Reverse current preventionfor PF key.D101 Speed upD102,103 LCD backlightD104 LED Red, green