Diagrams; Block Diagram - Tuner Section - Sony PMC-MD55 Service Manual

SECTION 6

DIAGRAMS

6-1. BLOCK DIAGRAM – TUNER Section –
TU BOARD
TB1 FL1
FM RF-IN
75Ω B.P.F 2
CT1, L1
FM
TRACKING
L1
FM RF OUT
FM
24
FM RF
EXT ANTENNA
D7
CT1
L2 FM OSC
21
FM OSC
D8 L2
FM VT
VOLTAGE
L3
AM ANT
AM
D9
ANTENNA
AM RF-IN
22
CT2
CT2, L4
AM
TRACKING
L4
AM OSC
AM 20
OSC
05
– 31 –
FM/AM FRONT-END
IC1 (1/2)
FM
FM
CF1 CF2
FM MIX-OUT IF-IN
4 IF AMP 7
MIX
Q14
MUTING
Q7
AM IF
T1
CF4 AM
FM
IF-IN
6
OSC
AM
MIX
PLL, LOW-PASS FILTER
IC2
OSC-OUT FM-IN
19 12 1/2 SWALLOW
12BITS
COUNTER
PROGRAMMABLE
1/16, 1/17
DIVIDER
AM-IN
4BIT
11
AM
OSC
PD PHASE DETECTOR
16
CHARGE PUMP
LP-IN
17
REFERENCE ST-IND
DIVIDER
MO/ST
IF-IN
18
LP-OUT
DATA SHIFT
X IN
REGISTER
19
LATCH
X1
75kHz
X OUT
BAND
20
CCB/IF
1 2 3 4
COUNT
CLK
DATA
CE
VT
CF3
10.7MHz
IF, DET, FM MPX
IC1 (2/2)
10
DIVIDE
FM AM/FM DET-OUT MPX-IN
16 15 DECODE
DET BUFFER
VCO
HIGH
FREQUENCY CUT
Q1
AM
DET
IF
BUFFER
18 17 14 13
R-CH
MONO/ST BAND
SWITCH SWITCH
Q2 (1/2) Q2 (2/2)
8
13
10
MUTE
MUTING
DRIVE
Q3
Q6
7
– 32 –
CN1
12
L-OUT RA-LCH
A
12 (Page 40)
MUTE
R-OUT
11 R-CH
MUTING
Q5
7 MUTE
B (Page 43)
6
COUNT
C
(Page 43)
5
CLK
D
(Page 43)
3
DATA
E (Page 43)
2 CE
F (Page 43)
1 VT
G (Page 43)
• SIGNAL PATH
: FM
: AM
R-CH : Same as L-CH.
PMC-MD55
– 33 –