Sony WM-FX271FP, Руководство по обслуживанию

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WM-FX271FP
IC301 LB8115
IC1 TA2111F
• IC Block Diagrams
Note for schematic diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and 1 /
4
W or less unless otherwise
specified.
• % : indicates tolerance.
• f : internal component.
•
C
: panel designation.
• A : B+ Line.
• H : adjustment for repair.
• Total current is measured with no cassette installed.
• Power voltage is dc 3V and fed with regulated dc power
supply from battery terminal.
• Voltage is dc with respect to ground under no-signal
(detuned) condition.
no mark : FM
(
) : AM
< > : PB
• Voltages are taken with a VOM (Input impedance 10 M Ω ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
F : FM
f : AM
E
: PB
1
2
3
4
5
6
7
8
9
10
11
12
36
35
34
33
32
31
30
29
28
27
26
25
13 14 15 16 17 18 19 20 21 22 23 24
48 47 46 45 44 43 42 41 40 39 38 37
COM
RI
PRE NF1
PRE OUT2
PRE NF2
VREF
POWER OUTC POWER OUT2
VCC
POWER MUTE
POWER IN1 POWER IN2
MIX OUT1
MIX OUT2
LP.2
R. P2
R.P1
DET OUT
MVREF
IN
+
VSP
LOW BOOST IN2
LOW BOOST IN1
LOW BOOST SW
M-GND
R.VREF
(FWD/REW)
PRE MUTE SW
POWER OUT1
POWER GND
MVCC DR WOUT MP-GND VOUT UOUT FC OUT OSC UB VB WB
PRE FWD IN2
PRE REV IN2
PRE REV IN1
PRE FWD IN1
S/S
PRE GND
PRE OUT1
BIAS
R.F
REF
SYS
CONT
DET
VREF
SPEED
LOW
BOOST
PRE DRIVER
OPERATION LOGIC
OSC
PLUSE DET
REF
VOLTAGE
REF VOLTAGE
FOR SPEED CONTROL
CURRENT
DET
OPERATION
DET
FWD/
REV
FREQ
CARC.
+
–
24
1 2
23 22 21 20
AGC
AM
DET
AM
MIX
FM
DET
LEVEL
DET
ST/MONO
FM/AM
TUN
LED ST
LED
FM
MUTE
AM
OSC
FM
OSC
FM
MIX
DECODE
DIVIDE
VCO
19 18 17 16 15 14 13
3 4 5 6 7 8 9 10 11 12
AF
BUFFER
FM RF
AF
AMP
AM
IF
FM
IF
FM RF IN
RF GND
AM LOW CUT
MIX OUT
AGC VCC
AM IF IN FM IF IN
GND
TUN LED
ST LED
QUAD
AM RF IN FM RF OU
T
RF VCC FM OSC AM OSC AFC DET OUT MPX IN LPF2 LPF1 L-OUT R-OUT