Sony MDR-RF920R, Service Manual

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15
MDR-RF920R/RF960R
• IC Block Diagram
IC302 LA4533M-TE-L-E
4-5. SCHEMATIC DIAGRAM – RX-FE SECTION –
Q2
C2 R1
C8
C1
C4
C6
R4
L1
C10
C12
R7
C13
C14
R8
Q3
X1
C29
R10
C30 C5
L2
0.33
µ
H
0.33
µ
H
C28
C9
C24
C23
C39
L4
C3
C25 L5
C7
CT1
C20
L7
L6
JC11
C19
R5
C22
L8
R6
C15
C11
C26
C40
JC2
Q1
CN2
CN3
CN1
2SC3120
MIXER
0.001 390k
2p
0.5p
1p
0.001
470k
0.5p
11p
150
3p
47p
47k
2SC5084-OTE85L
OSC
SAW433.92
0.001
100k
62p 62p
120p
47p
1.5p
15p
0.001
1.5T
1p
100p 1.5T
1p
5p
0.001
1.5T
1.5T
0
0.001
150k
100p
12nH
150
100p
0.5p
1.5p
0.001
0
3SK309
RF AMP
(RF920R)
12
(RF960R)
13
1
2
3
4
5
10
9
8
7
6
POWER
SWITCH
BIAS
MUTE
CIRCUIT
AMP 1
POWER SWITCH
IN-1
PRE-GND
IN-2
REF
MUTE SWITCH
OUT-1
POWER GND
OUT-2
VCC
AMP 2
Note on Schematic Diagram:
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F 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.
•
A
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 2.4V and fed with regulated dc power supply
from external power voltage jack.
• Voltages and waveforms are dc with respect to ground under no-
signal (detuned) conditions.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production tolerances.
• Signal path.
F
: FM
L
: AUDIO