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KR-A4010
CIRCUIT DESCRIPTION
4. FM MPX AN7470 (X14-2540-10 : IC3)
Equivalent block diagram
SEP. ADJ
Lech
OUTPUT
AMP
STEREO
7 MONO
SWITCH
CONSTANT
VOLTAGE
CIRCUIT
19 kHz
FREQUENCY
°
CHECK
Terminal connection and functions
Terminal No.
Connection/Function
| Supply voltage (+Vcc)
Stereo composite signal, input terminal
Input preamp, output terminal
L CH output amp, feedback terminal
[_R CH output amp, feedback terminal
R CH output amp, output terminal
L CH output amp, output terminal
Grounding terminal
Stereo display lamp drive and 19 kHz frequency check terminal
Stereo signal detector circuit, low-pass filter terminal
Stereo signal detector circuit, low-pass filter terminal
PLL circuit, input terminal
TPL circuit, low-pass filter terminal
PLL circuit, low-pass filter terminal
VCO freerun oscillation frequency adjustment terminal
Forced mono/forced VCO oscillation stop terminal
14
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