10
MDR-RF975R
SECTION 4
DIAGRAMS
Note on schematic diagrams.
Note:
• 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.
•
f
: internal component.
•
A
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 2.4V and fed with regulated dc power supply
from battery terminal.
• Voltages are dc with respect to ground under no-signal conditions.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
• Signal path.
F
: FM
L
: AUDIO
• IC BLOCK DIAGRAMS
IC302 LA4533M TP-1
IC305 TC7W74FU (TE12R)
POWER
SWITCH
MUTE
CIRCIUT
BIAS
1
2
3
4
5
6
7
8
9
10 MT/SW
OUT1
POWER GND
OUT2
VCC
P/SW
IN1
PRE GND
IN2
REF
AMP2
AMP1
6
CLR
7
PR
8
VCC
5
Q
R
S
Q
3
Q
2
D
4
GND
1
CK
Q
D
C
