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KT-990D
IF/DET unit (X86-1020-02)
IC8 (NJIM4200D)
Tertiary distortion generator
Linear multiplier.
IC9 (NJIM4200D)
Secondary distortion generator
Linear multiplier.
1C11 (M5218P)
1/2 | Tertiary current/voltage converter
2/2 | Distortion phase correction amplifier
Tertiary distortion is Stereo mode.
"T€12 (M5218P)
1/2 | Secondary
distortion
current/voltage
converter
2/2 | Distortion output correction amplifier
Increases distortion in NARROW
mode.
1C13 (M5218P)
1/2 | Reference voltage generator
VCC/2=7.5V.
2/2 | DET distortion correction amplifier
Corrects the distortion in PLL DET.
1C14 (M5218P)
1/2 | Mono distortion correction amplifier
Used for correcting the secondary distortion.
2/2 | Stereo distortion correction amplifier
Used for correcting the tertiary distortion.
Sub-circuit unit (X13-5750-11)
RESET control
When turned ON, activates RESET
M type frequency span switching
When ON, the step is set to 50kHz with FM and 9kHz with AM
DOWN
LED control
When ON, the DOWN
LED is illuminated.
UP LED control
S meter center grid control
When ON, the UP LED is illuminated
When ON, 5V is applied to the S meter center grid
When ON, 5V is applied to the T meter right side grid.
When ON, 5V is applied to the T meter left side grid.
When ON, controls 06.
When ON, 5V is applied to the emitters of 06, Q7, 8, Q16 andQ17,
and permanent ON control
to grids Nos. 1, 2 and 6, and to permanent ON.
T meter right grid control
Q5
O6
Q7
fos SCSC*d meter gr convoh |
Q10
TS meter,
ST, BIL, 1st/2nd/6th
grid
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