2-34
2.1.7.3
Back-Lite control circuit
A cold-cathode tube is used for the back light of the LCD.
The +12V power supply for driving is fed from an external inverter.
Assuming that the LCD is in the display mode (the FPEN signal at the high level), ON/OFF control of the power supply is
effected by software.
This system performs controls in two positions; GPO_0 (Default = High) that is a general-purpose port of the FW82371EB and
Bit0 (BACKEN) that is the I/O address 320H.
The Back-Lite is turned ON when the conditions of both are satisfied.
Generally, the control of FW82371EB is not used. Instead, ON/OFF control is performed by managing the BACKEN signal that is
used for the control of the I/O address 320H.
The control hardware is located inside the gate array.
+12V
+12V
GND
BACKLIT_ON#
BACK_ON
G AT E A R AY
FPEN
FPVDDEN
FP/FVSYNC
84
85
86
87
83
B L _ON
F P E N _IN
L C D P W R
B A C K L I T O N
V S Y N C
Содержание JS-170FR Series
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Страница 101: ...3 17 LCD DISPLAY TEST 6 Video Test ENTER 1 OK or 2 NG ...
Страница 134: ...4 JS 170FR PCB s 4 1 Main PCB 4 1 1 Main PCB Schematic Diagram 1 10 4 1 ...
Страница 135: ...4 1 1 Main PCB Schematic Diagram 2 10 4 2 ...
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Страница 143: ...4 1 1 Main PCB Schematic Diagram 10 10 4 10 ...
Страница 144: ...4 1 2 Main PCB Parts Location 4 11 ...
Страница 145: ...4 2 MB PCB 4 2 1 MB PCB Schematic Diagram 4 17 ...
Страница 146: ...4 18 4 2 2 MB PCB Parts Location ...
Страница 148: ...4 3 Peripheral PCB 4 3 1 Peripheral PCB Schematic Diagram 4 20 ...
Страница 149: ...4 21 4 3 2 Peripheral PCB Parts Location ...
Страница 152: ...5 2 Main PCB 75 Peripherals ...
Страница 153: ...5 3 Power Supply Peripherals ...
Страница 154: ...5 4 Customer Display Peripherals ...
Страница 155: ...5 5 LCD Peripherals ...
Страница 156: ...5 6 Inverter PCB Peripherals ...
Страница 161: ...Printed in Japan ...