Sony PMC-MD55 Service Manual page 140

SECTION 6
DIAGRAMS
6-1. BLOCK DIAGRAM – TUNER Section –
TU BOARD
(AEP, UK)
TB1
FM EXT
ANTENNA
(AEP, UK)
(US, CND)
(US, CND)
FL1
75Ω B.P.F
L1
FM
FM RF
EXT ANTENNA
D7
L2
FM OSC
D8
CT3, L5 CT2, L3
(US, CND) L3
LW TRACKING LW TRACKING AM (MW) ANT
AM
D9
ANTENNA
(US, CND)
CT3 CT2
CT2, L4
AM
MW MUTING
TRACKING
Q9
MW/LW
ANTENNA
L5
LW ANT
(AEP, UK)
LW MUTING
L4
AM
OSC
MUTING
CONTROL
SWITCH
CT5
CT4
Q12
CT5 CT4, L4
MW MUTING
LW VT VOLTAGE MW VT VOLTAGE
Q10
(AEP, UK)
05
– 31 –
TU1
FM TUNER UNIT
1 ANT IF OUT 7
5 VT OSC OUT 8
FM/AM FRONT-END
IC1 (1/2)
CF1
FM RF-IN FM MIX-OUT
2 4
CT1, L1 MIX
FM
TRACKING
FM RF OUT
24
CT1 AM IF
T1
FM OSC FM
21
OSC
L2
FM VT
VOLTAGE
(US, CND)
AM RF-IN
AM
22
MIX
RF AMP
Q15
(AEP, UK)
OSC-OUT FM-IN
19 12 1/2
AM-IN
Q8 11
AM OSC AM
20
OSC
PD
PHASE DETECTOR
16
CHARGE PUMP
LP-IN
17
REFERENCE
DIVIDER
18
LP-OUT
X IN
19
B+ SWITCH
+B +B
(FM TUNER UNIT) Q13 (+8V) X1
75kHz
X OUT
20
(AEP, UK)
9 FM-L
6 MW-L
5 LW-L
CF3
10.7MHz
10
FM
FM CF2
DET-OUT
IF-IN FM AM/FM
IF AMP 7 16
DET BUFFER
Q14
MUTING
Q7
AM
CF4
IF-IN AM
6
DET
IF
BUFFER
18 17 14 13
PLL, LOW-PASS FILTER
IC2
RDS
SWALLOW
12BITS BUFFER
COUNTER
PROGRAMMABLE Q11
1/16, 1/17
DIVIDER
4BIT
MONO/ST BAND
SWITCH SWITCH
Q2 (1/2) Q2 (2/2)
ST-IND
8
MO/ST
13
IF-IN
10
DATA SHIFT
REGISTER
MUTING
LATCH
Q3
BAND
7
CCB/IF
1 2 3 4
COUNT
CLK
DATA
CE
VT
– 32 –
IF, DET, FM MPX
IC1 (2/2)
CN1
(1/3)
12
L-OUT RA-LCH
DIVIDE 12 A
MPX-IN
15 DECODE MUTE
R-OUT
VCO 11 R-CH
HIGH
MUTING
FREQUENCY CUT
Q5
Q1
R-CH
MAIN BOARD (1/6)
X403
4.332MHz
CN1 CN408
14 13
(2/3) (1/2)
XO XI
8 1 RDS
MUX
4
DECODER
IC406
2 16
MUTING
CONTROL
Q6
CN1
7 9
(3/3) CN402
7 7
63 R-MUTE
6 6
R-COUNT
64
5 5 SYSTEM CONTROLLER
65 R-CLK
IC405(1/5)
3 3
66 R-DATA
2 2
67 R-CE
POWER SUPPLY
1 1
VT
G
• SIGNAL PATH • Abbreviation
: FM CND : Canadian
: AM
R-CH : Same as L-CH.
PMC-MD55
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