Schematic Diagram - Rx Board - Sony NTM-30 Service Manual

4-5. SCHEMATIC DIAGRAM – RX Board –
• Waveforms
1 IC201 2 (OSC OUT) (CH A) (RX mode) 2 IC201 2 (OSC OUT) (CH B) (RX mode)
500 mV/DIV, 50 nS/DIV 500 mV/DIV, 50 nS/DIV
640 mVp-p
60.76 nS
60.723 nS
3 IC201 2 (OSC OUT) (CH C) (RX mode)
500 mV/DIV, 50 nS/DIV
500 mVp-p
60.686 nS
– 15 –
500 mVp-p
• IC Block Diagrams
IC201 TA31136FN
16 15 14 13 12 11 10
MIXER
RSSI
NOISE
QUADRATURE
COMPARATOR
DETECTION
DETECTOR
NOISE
BUFFER AMP
IF AMP
LOCAL
OSCILLATION
1 2 3 4 5 6 7 8
IC202 CXA1522M
16 15 14 13 12 11 10
VOLUME
PRE/POWER 1
REGULATOR
PRE/POWER 2
1 2 3 4 5 6 7
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
1
/ W or less unless otherwise
4
specified.
• ¢ : internal component.
• C : panel designation.
• U : B+ Line.
• H : adjustment for repair.
• Power voltage is dc 9 V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : RX
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
N
: RX
– 16 –
NTM-30
9
L.P.F
FILTER
AMP
9
8