Kenwood TK-90, Service Manual

Page: 36 / 142

TK-90
36
Ref. No. Use / Function Operation / Condition
Q322 Amplifier IF amplifier for NB circuit
Q323 Differential IF amplifier for NB circuit
amplifier
Q324 Amplifier NB AGC control amplifier
Q325 Amplifier IF amplifier for NB circuit
Q326 Switching Generate IF mute signal
Q327 Buffer Buffer for NB IF signal
Q329 Switching Generate IF mute signal
Q361 Switching AM time constant
Q362 Switching CKY control
Q363 Comparator Comparator
Q364 Switching CKY control
Q365,366 Amplifier ALC voltage control
Q421 Switching AMB switch
Q423 LPF Side tone LPF
Q451 Amplifier AGC 2nd IF amplifier for RX
Q452 Inverter For IF amplifier mute switch
Q453 Amplifier AGC voltage control
Q454 Switching AGC-OFF switch
Q455 Amplifier AGC 2nd IF amplifier
Q456 Switching IF amplifier mute switch
Q457 Buffer Buffer for 2nd IF signal
Q458 Buffer Output buffer for AM detection signal
Q459 Amplifier Output amplifier for detection signal
Q460 Switching Detection signal mute switch
Q521 Switching Detection signal mute switch
Q522 Ripple filter For audio amplifier VCC
Q523 Switching Cutoff frequency switch
Q524 Switching Audio amplifier mute switch
Q601,602 Switching Audio AGC voltage
Q603 Switching VOX switch
Q604 Switching VOX function control signal
Q605,606 Switching Audio AGC voltage
Q607,608 Switching MIC boost switch
Q609 Switching DI mute switch
Q610 Switching MIC mute switch
Q701 Amplifier IC701 CLK input amplifier
Q702 Buffer 31.2MHz buffer
Q703 Amplifier IC702 CLK input amplifier
Q704 Doubler 15.6MHz x 2
Q706 Amplifier LO1 output amplifier
Q707 Buffer DDS output buffer
COMPONENTS DESCRIPTION /
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