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Function of components
Tuner unit (X05-3992-71)
Components.
A-711/711L
CIRCUIT DESCRIPTION
Use/Function
Operation/Condition
LA1265
FM/AM
system
IC
FM iF amplification,
FM detection,
AM
MIX, AM
IF amplification
and AM
detection.
i AN7470
Audio demodulation
(AM,
FM}
FM
stereo
multiplex
M7001
PLL IC
PLL
CXP50112-1270
Tuner microprocessor
Tuner control,
timer operation
and control
of others.
| uPD7538ACU-232
Amplifier microprocessor
Amplifier control.
PST529D
Reset IC
Generates
the reset power
source.
BPC7805HF
or
AN7805F
+5V
3-terminal
regulator
+5V
rectification
#PC7805HF
or
AN7805F
+5V
3-terminal
regulator
+5V
rectification
2SC1923{R.0)
IF amplification
IF amplification of FM
2SK163(L,M)
+
PLL time constant
conversion
Sw
At the time of LW
reception:
OFF
2S8C945{(ANQ,P)
or.
2SC1740S(Q,R)
L.P.F.
L.P.F. for PLL (integration
type)
2SC1845(F,E}
Torr.
r L.P.F. for PLL (integration type)
2SC945{AHQ,P) or
28C1740S(Q,R)
2SC945(ANQ,P) or
28C1740S(Q,R)
2SC945{ANQ,P) or
2SC1740S(Q,R)
2SA733(ANQ,P) or.
2SA933S(Q,R)
2SA733(ANQ,P) or
2SA933S(0,R)
2SA733(A}(Q,P) or
2SA933S(Q,R)
2SC945(A)(Q,P) or
2SC1740S(Q,R)
MWILW
conversion
MW/LW
conversion
Buffer
FM
+
B conversion
LW
+
B conversion
MW
+ 8 conversion
Deemphasis conversion
2SC9451(A)(Q,P) or
2SC1740S(Q,R)
L
Deemphasis
conversion
~~
At the time of MW: ON
At the time of LW: ON
Buffer for FM detecting
output (for L.P.F matching}
At the time of receiving FM: ON
At the time of receiving LW: ON
At the time of receiving MW: ON
50 psec. «+ 75 psec.
At the time of Tr. ON:
75 ysec.f
~
mE
2SC945(A}(Q,P) or
2SA1740S(Q,R)
Reversing
circuit
Controls
reset circuit (Tuner p-COM)
2SA733(A}(0,P) or
2SA933S(Q,R)
Reversing
circuit
Controls
reset circuit {Amplifier p-COM)
2SA733(ANQ,P) or
2SA933S(Q,R)
Reversing
circuit
Reverses
the mute
signal from the amplifier microprocessor.
2SA733(AN(Q,P) or
2SA933S(Q,R}
Reversing
circuit
Reverses
the mute
signal from the tuner microprocessor.
2SA733(A}(Q,P) or
2SA933S(Q,R)
Destination
Conversion
SW
Converts
deemphasis
and channel
space.
2801302iS,T)
Mute
Mute
SW
of Lch.
28D1302(S,T)
Mute
ah
Mute SW of Rch.
| 28012800.
2SC945(A}(G,P) or
2$C1740S(Q,R}
7
2SC945(AMQ,P) or
2SC1740S(O,R}
+ 14V rectification
Generates
the stabilized power
source
for 14V.
11
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