Block Diagram - Tuner Section - Sony ICF-CD855V Service Manual

6-2. BLOCK DIAGRAM – TUNER Section –
ANT1
FM/TV/WEATHER
LEAD WIRE ANTENNA
D13
B.P.F.
BPF1
24
CT2, L1
L1
D15
TV/WEATHER CT2
TV(7 – 13CH)/WEATHER
RF
TRACKING
D14
L2
L2
D1
FM/TV(2 – 6CH)
FM/TV
TRACKING
RF
22
RADIO 6V
L5
AM FERRITE-ROD
ANTENNA
D3
CT5
(1/2)
CT5, L5
AM TRACKING
20
X61
75kHz
19
FM/AM RF AMP, MIX, OSC,
FM/AM IF AMP, DET, MPX
IC1
FM
RF IN MIX OUT
FM FM
2 4
RF AMP MIX
FM
FM
RF OUT
OSC
AM IFT
AM IF
AM
RF IN AM
AM
RF AMP
MIX
OSC
BUFFER
OUT
19
AM
BUFFER
OSC
CT4, L3
TV(7 – 13CH)/WEATHER
20 21
VCO VOLTAGE
L6
AM VCO VOLTAGE L3
D17
CT4 TV/WEATHER
OSC
L6
AM OSC
L4
D24
FM/TV
CT3
D2 OSC
D3
CT3, L4
(2/2) RADIO B+
FM/TV(2 – 6CH)
VCO VOLTAGE
D21
TV (7-13CH)/
FM/TV (2-6CH)
WEATHER
ON SWITCH
ON SWITCH
LOW-PASS
Q12
Q11
FILTER
RADIO B+ RADIO B+
7 6 18
FM/AM PLL
IC2
LOW-PASS
FILTER
XOUT
REFERENCE
PHASE
DIVIDER
DETECTOR/
XIN
CHARGE PUMP
12 BIT
UNLOCK
PROGRAMMABLE
DETECT
DIVIDER
T2
FM IFT
T2
FM IF
10
FM
IF IN
CF2
FM IF FM
7
AF
AMP DET
BUFFER
T1
AM
IF IN
CF4
AM IF AM
6
AMP
DET
T1
LEVEL
DET
IF
BUFFER
17
OSC
BUFFER
Q14
VT B+
SWITCHING
Q13
RADIO B+
17 16 12 11 5 10
UNIVERSAL
COUNTER
1/2
SWALLOW
COUNTER
SHIFT REGISTER & LATCH
17 17
L-OUT
DET MPX
OUT IN
AF
16 15 MPX MUTE
AMP R-OUT
STEREO/
MONO,
FM/AM
ST
IND
18 13 14
• R-ch is omitted due to same as L-ch.
• SIGNAL PATH
R MUTING
8 9 13
DI
R DATA
2
R CLOCK
CL
3
CCB
CE R CE
INTERFACE
1
DO
4
ICF-CD855V
TU L-OUT
B
12
(Page 18)
11 R-CH
: FM/TV (2 – 6CH)
: TV (7 – 13CH)/WEATHER
: AM
R DATA, R CLOCK,
R CE, R MUTING
C
(Page 18)