Demodulation Circuit Adjustment; Tuning Adjustment - Sony Power HAD FX HSC300R Service Manual

4-3.

Demodulation Circuit Adjustment

4-3-1.

Tuning Adjustment

Preparation
• Supply the DC IN connector with external power (+12 V).
• Set the CAMERA POWER switch to EXT.
• Disconnect the coaxial cable from the connector CN601 on the TX-148 board, and connect the FM signal generator
to CN601. Input the following FM signal from the FM signal generator.
- Carrier: 1.0MHz
- AF: 1 kHz
- Dev: ±3 kHz
- RF level: -15 dBm
Adjustment Procedure
1. Connect the oscilloscope to the following terminals on the TX-148 board.
Test Point: TP004
GND: E301
2. Adjust the LV004 on the TX-148 board so that the DC level becomes 2.5 ±0.2 V.
Measuring Point/Adjusting Point
E301
TP004
LV004
HSC300RF/HSC100RF/HSC300R/HSC100R
A = B
A
B
2.5 ? 0.2 V
GND
CN601
TX-148 board (Side A)
4-3