Schematic Diagram -Tuner Section - Sony PMC-D307L Service Manual

6-7. SCHEMATIC DIAGRAM — TUNER SECTION —
– 29 –
• Waveforms
1
2
– 30 –
• IC Block Diagrams
IC1 TA2008AN
24 23 22 21 20 19
AM
AM FM
RF
OSC OSC BUFF BUFF
1.4Vp-p
1/8DIV
FM AM
2.2µs
MIX MIX
!£
IC1 (VCO)
AGC
FM
FM
RF
IF
1.4Vp-p
1 2 3 4 5 6
75kHz
1
IC2 (X OUT)
IC2 BU2615S
2
XIN REFERENCE DIVIDER
XOUT 1
16
FMIN
PRESCALER MAIN COUNT
AMIN 15
SHIFT REGISTER LATCH
CE 3
I/O
CK 4
CTL
DA 5
CD 6
P0 7
8
P1
P2 14
20BIT COUNT
9 10 12
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
• Voltages are taken with a VOM (Input impedance 10 MΩ).
50 WV or less are not indicated except for electrolytics Voltage variations may be noted due to normal produc-
and tantalums. tion tolerances.
• All resistors are in Ω and
1
/ W or less unless otherwise • Waveforms are taken with a oscilloscope.
4
specified. Voltage variations may be noted due to normal produc-
• ¢ : internal component. tion tolerances.
• C : panel designation. • Circled numbers refer to waveforms.
• U : B+ Line.
• Signal path.
• H : adjustment for repair. F : FM
f
• Voltage and waveforms are dc with respect to ground : MW/LW
under no-signal (detuned) conditions.
no mark : FM
( ) : MW
<< >> : LW
– 31 –
PMC-D307L
18 17 16 15 14 13
FM MPX
IF AF
AM/FM
BUFF BUFF
ST/MONO
SW
AM
DET
LEVEL FM ST
AM
MUTE
DET DET DET
IF
7 8 9 10 11 12
19 PD1
PHASE
DET
BUFFER
11 PD2/P5
18 VDD1
17 VDD2
20 VSS
IF COUNT
13 IF IN
CTL