Circuit Boards; Main Board - JVC VF-P115BU Service Manual

3.2 CIRCUIT BOARDS
MAIN BOARD
SIDE B
CN6
C214
C111
R601
VR BOARD
SIDE B
6
3
TOPTALLY BOARD
SIDE B
3.3 Description of New Circuit
4:3/16:9 switching
The 4:3/16:9 switching signal from the camera is input through pin 5 of the VF connector. The input voltage is 0 V ( L ) for 4:3
and +5 V ( H ) for 16:9.
Based on this signal , the rely ( RY501 ) on the MAIN board is connected to pins 2 and 9 for 4:3 or to pins 3 and 8 for 16:9.
The signal voltage is adjusted by VR501 ( V. HEIGHT ) with 4:3 or by VR502 ( V. HEIGHT 2 ) with 16:9 and the adjusted voltage
is input to IC2 ( drive IC ) . The controlled IC2 output signal is used to control the V size of the deflection yoke.
MAIN BOARD
IC2
V. DRIVE
1 3 5
V-DFF YOKE
7 7
VR BOARD
+5V
16 : 9/4 : 3
16 : 9 4 : 3
VR502 VR501
RY501