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KT-1100D
CIRCUIT DESCRIPTION
Function of components
Tuner unit (X05-3172-71)
Tuned buffer amp
ON when in the Direct mode.
Q10
FM RF select output
ON when in the Distance mode.
ON when in the WIDE mode.
Q12
Turns Q11 ON when base is high.
Q13
IF BAND select output
ON when in NARROW mode.
Q14
\F BAND select
Turns Q13 ON when base is low.
ar
ON when in FM mode.
Qi7
ON when in the AM mode.
Components
Operation/Condition/Interchangeability
e) iN
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Isolates the oscillater from the mixer.
For pre-scaler.
Qi19g
Turns ON when the output from IC1 pin 1 is low to turn the STOP signal low.
AM signal switch
Turns ON when in the AM mode to transmit the audio signal.
Q21
REC CAL signal switch
Turns ON when in the REC CAL mode to transmit the REC CAL signal.
:
Turns ON when in the REC CAL mode to cut the FM/AM signal (Q20: OFF).
REC CAL signat control
:
Turns Q21 ON when in the REC CAL mode.
Applies the load resistance to IC8.
.
Performs constant current operation together with Q24.
Current mirror constant current
:
Applies the load resistance to IC8.
Performs constant current operation together with Q26.
Turns ON when in the NARROW mode and controls the separation (NARROW).
Sub signal decode switch
OFF when in stereo, ON when in mono.
NTN
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Q30, 31
Current mirror contact current
Applies the constant current load (to ground side).
Auto quieting control
Controls the sub decoding level automatically when ANT input is low.
Loads the tuning circuit (38 kHz) consisting of LC (coil and capacitor) to convert the
square wave into the sine wave.
38 kHz sine wave generator amp
Stereo display switch
Receives the signal from IC 12 to turn the STEREO indication ON/OFF.
38 kHz buffer amp
Transmits the 38 kHz signal from the tank circuit to the SUB decoder in low impedance.
Power ON muting
This switch is used to make the rising edge of IC2 (pin 1) output the muting signal.
Mute driver switch
Turns OFF when muting signal does not exist and make the base of the muting driver
high impedance.
Q38, 39
Muting driver
Receives the muting signal and short-circuits the audio output.
Tracks to +15V power supply. (For—14V)
Q40
Constant voltage power supply
+15V output. (Current buffer for IC 13)
Constant voltage power supply
—14V output. (Power supply for control)
Constant voltage power supply & display
switch
Q44
Error amp & display control
For +18V. (Tracking to ~14V power supply)
Q45
Power OFF mute control
Turns ON at the same time when the power is turned OFF and controls the mute signal.
047
For +28 NT
Q49
Receives the signal from IC 17 (pin 10) and turns DISTANCE ON. + Outputs 5 V.
Output side.
+18V output. (Power supply for display}
Differential amp
Receives the error signal from the controiler.
Power supply for CH A/CH B display LED. (Synchronized with the FL display)
5V switch for display
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