Electrical Adjustments - Sony NTM-30 Service Manual

Sound-sensor nursery monitor

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Table Of Contents

Table of Contents

TRANSMITTER SECTION

Transmitter Output Adjustment

Setting:

CH switch (S101): B

AF OSC

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.