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KT-7020
CIRCUIT DESCRIPTION
Function of components
Tuner unit (X05-342X-XX)
Components
Use/Function
Operation/Condition/Interchangeability
Q1
FM RF amplifier
Q2
Mixer
a3
FM OSC (TUNED) buffer
Q4,5
| FM OSC
ag
Regulator (error amplifier)
is turned ON setting the AM mode.
Q12~14
PLL loop filter
Q17,18
Q22
Q34
DIS/DIR switching
Goes ON when the input is "H". Turns Q17 and Q18 ON.
DIS/DIR switching
WIDE/NARROW switching
STOP control
STOP SENS switching
REC CAL control
AM switching
REC CAL switching
Forced Mono control
Auto quieting control
Driver. Q17 is ON for DiS and Q18 is ON for DIR.
When the input to Q19 is "H", Q20 is turned ON (Wide).
SENS is High when the input is "H".
REC CAL is set when the input to 024 is "H".
Switches the AM signal.
Switches REC CAL.
Forced Mono mode is set when the input is "H™.
demodulator at a low impedance.
Q37
circuit
Gain switching
Regulator
—13V output.
Q60
Q56,.57
Q58,59
Regulator
Q61
Regulator
For +5V PLL. prescaler IC.
Regulator
PANT On
For +28V Vt.
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