Kenwood 762G Service Manual

31TK-760G/762GDESCRIPTION OF COMPONENTSDisplay Unit (X54-3270-10) : TK-760GRef. No. Use/Function Operation/ConditionD801 Reverse currentpreventionD802~805 Light emissionD808 Current stabilityIC801 LCD driverQ801 DC switch (LED)Display Unit (X54-3280-10) : TK-762GRef. No. Use/Function Operation/ConditionD801 Light emissionD802 Reverse currentpreventionD803,804 Light emissionIC801 LCD driverQ801~809 DC switch (LED)TX-RX Unit (X57-5950-XX)-10 : TK-760G K -11 : TK-762G K -12 : TK-760G K2-13 : TK-762G K2 -21 : TK-760G MRef. No. Use/Function Operation/ConditionD1 Surge absorptionD2 Voltage referenceD3~5 Surge absorptionD8 IF switch (Wide/narrow)D9 DC switchD10 IF switch (Wide/narrow)D11 Noise amp detectD14 Surge absorptionD15 OR gate SP mute, AMD16 RF switch (TX/RX) HeterodyneD17 Temperature DrivecompensationD18 RF BPF tuningD19 Surge absorptionD20 Reverse currentpreventionD21 Voltage referenceD22 Temperature DrivecompensationD23 RF BPF tuningD24 Voltage referenceD25 Surge absorptionRef. No. Use/Function Operation/ConditionD27 Reverse currentpreventionD28 RF BPF tuningD29 Reverse currentpreventionD30,31 RF BPF tuningD33,34 ANT switchD35,36 APC voltage detectD39 Voltage reference Power protectionD40 Charge DEOD41 Voltage drop Charge pumpD501 Reverse current KOUT 0preventionD502 Reverse current KOUT 1preventionD503 Reverse current KOUT 2preventionD504 Reverse current KOUT 0preventionD505 Reverse current KOUT 1preventionD506 Voltage discharger When powering downD507 Reverse current KOUT 2preventionD508 Limiter MICD509~514 Key backlight Active while MBL is HD521 Busy/TX LED Lights green while busy,red while TXD523 OR gate MIC mute, MM, MM2D524 Surge absorption HOOK/RXDD525 Surge absorption PTT/TXDD526 Current protectionD527 Surge absorption CMD528 Surge absorption MBLD529 Limiter QT/DQT decode limiterIC1 Sum amplifier DI, TO mixerIC2 DC amplifier FC, TCXO controlIC3 PLL synthesizer Reference 16.8MHz,PLL lock : LD HIC4 Amplifier DEOIC5 FM demodulation Quadrature detector, 2nd mixer,OSC, IF amplifier, RSSIIC6 D/A converterIC7 DC amplifier PC/TV controlIC8 Prescaler 1/2 prescaler