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Electrical Adjustments - Sony NTM-30 Service Manual

Sound-sensor nursery monitor.
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TRANSMITTER SECTION
Transmitter Output Adjustment
Setting:
CH switch (S101): B
AF OSC
TX board
TX board
TP3
+
Set
(transmitter)
Signal level:
–57 dB/1kHz
TX board
TP4
Procedure:
1. Take out solder for BP1 on the TX board, and take out solder
for BP2 on the MIC board.
2. Connect the frequency counter, RF-VTVM and modulation
meter with TP1 and TP2.
3. Adjust L105 for 49.860 MHz reading on the frequency counter.
4. Adjust T101and T102 for maximum reading on the RF-VTVM.
5. Adjust RV101 for 0.075 to 0.085 Vrms reading on the RF-
VTVM.
6. Connect the AF OSC with TP3 and TP4, and input the signal.
7. Adjust RV102 for 2.5 kHz deviation reading on the modula-
tion meter.
8. After adjustment take solder on BP1 and BP2
Transmitter Loading Coil Adjustment
Setting:
CH switch (S101): B
Set
(transmitter)
about 300 mm
Procedure:
Adjust L101 for maximum waveform on the oscilloscope.

ELECTRICAL ADJUSTMENTS

frequency counter
TP1
50 Ω
+
RF-VTVM
TX board
TP2
+
modulation meter
+
oscilloscope
+
10 µ H
SECTION 3
Adjustment Location:
– TX BOARD (Component Side) –
RV102
– TX BOARD (Conductor Side) –
Transmitter Loading Coil
Adjustment
– MIC BOARD –
(Conductor Side)
BP2
– 6 –
L105
T101 RV101
Transmitter Output Adjustment
BP1
TP1
TP2
TP4
TP3
L101
T102

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