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4-1. BLOCK DIAGRAM
R-CH
J401
B
AUDIO IN
J402
L
A
NOISE
FILTER
R
R-CH
S401
NOISE FILTER
OFF
|
ON
• Signal path.
16
: AUDIO
SECTION 4
DIAGRAMS
IC403
STEREO MPX
IC401
INPUT
CH1
LPF
1
BUFFER
AMP
AMP
TIME
DEVISION
MPX
CH2
R-CH
14
AMP
BUFFER
OSC
DIVIDER
AMP
6
7
X401
38kHz
BUFFER
RECT
Q401
D404,405
— 5 —
RV403
9
MOD IN
ANT
T-OUT
VCO UNIT
8
5V
B+
CE DI CL
11
12
13
IC405(1/2)
CE DI CL
VS
10
INPUT
15
IC404
DET
VCO CONTROLLER
16
5V
9
7
6
1
S402
2
CHANNEL
3
ANT401
IC405(2/2)
POWER OFF
DET
D402
CHG
IC402
+5V
SWITCH
REG
Q404
D401
POWER
+4V
Q402
2V
D408
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• b : Pattern from the side which enables seeing.
Note on 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
•
: internal component.
f
• A : B+ Line.
• H : adjustment for repair.
• Power voltage is dc 9 V 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 MΩ).
Voltage variations may be noted due to normal production toler-
ances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production toler-
ances.
• Circled numbers refer to waveforms.
• Signal path.
L: AUDIO
— 6 —
TMR-RF815R
CHARGE
J404
DC IN 9V
1
/
W or less unless otherwise specified.
4
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