Block Diagram And Schematic Diagram; Tuner Amp Unit - Pioneer KEH-1940 Service Manual

1
KEH-1940,1960

3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM

3.1 BLOCK DIAGRAM
A
A

TUNER AMP UNIT

B
FM/AM TUNER UNIT
Q3
FM RF
CN301
ANT
25
26
FM
OSC
Q201 Q202
B
AMRF/AGC
AMTV
19 20
C
Q302 Q303
LOOP FILTER
D
10
1
2
T31 Q31 CF51 CF52
FM/AM MIX FM/AM IF FM IF
41 9 10 14 15
FM/AM PROCESSOR
34
PA4023B
IC 1
36 18 23
6 38 32 16
CF232 AM IF
AM
FM+B AM+B
OSC
14
21
15 17
FIX+B
Q806
FM
EO
Q808
FM SWITCH
LW
Q304
LW
2
3
CF53
T51
FM IF
17 19 47 1 2
FM PROCESSOR
IC 2 PA4024A
25 31 28 43
30 40
FMSL
AMSL
TUN+B
13 6
Q804
FIX+B
9V REGULATOR
14
SL
SL
12
FMSD FMSD
SYSTEM CONTROLLER
FIX+B
Q805
AM
Q807
AM SWITCH
3 13
57
3
4
TUN-L
19
7
9
18
B.U
Q802
SYSPW
Q803
ILL+B
IC 601 (1/2)
PE5107A
6 54 51 24
25
X601
4.5MHz
4
ILL+B
FWD-L
FWD
FWD
Lch
REV
Lch
HEAD REV-L
M
L
GND
M
D
CA
MOTOR
C
KEYBOAR
IL901-903
KEY MATRIX