Vco Free-Running Frequency Adjustment - Sony BRC-300 Service Manual

3-6-3. VCO Free-running Frequency
Adjustment
Adjustment Procedure
1. Connect the oscilloscope and the frequency counter as
shown in the figure.
Probe
Oscilloscope
2. Set the switch S8001 on the SD-50 board as shown in
the figure.
3. Turn on the power of all the equipment, and warm
them up for about 20 minutes.
The indicator D8001 on the SD-50 board will be lit.
4. Perform the adjustment checking the value of the
frequency counter.
Test point: TP8001/SD-50 board
GND: Body (shell part) of BNC
connector
1RV8001/SD-50 board
Adjusting point:
27000 ± 27 kHz
Specification:
5. Turn off the power of the BRC-300/300P.
6. Reset the switch S8001 on the SD-50 board as shown
in the figure.
7. Perform "3-6-4. Output Video Check".
BRC-300/300P
BRU-300/300P
Frequency counter
S8001
S8001
3-6. BRBK-302 Electrical Alignment
TP8001
TP8002
S8001 RV8001
SD-50 BOARD (A SIDE)
D8001
3-41