Read Panasonic KX-HDV20RU Service Manual online
9
KX-HDV20 Series
4.2.4.
Self Label LCD Circuit
LCD data are output from pin 3 of IC101 to LCD module.
LCD contrast is set by electronic control in LCD module.
The driving voltage(about 16V) is observed at pin15 of CN101.
The lighting of the backlight is controlled by Q101.
The PWM (Pulse Width Modulation) signal is output from IC101 (pin 30) pin and the brightness is changed according to its duty
ratio.
LCD contrast is set by electronic control in LCD module.
The driving voltage(about 16V) is observed at pin15 of CN101.
The lighting of the backlight is controlled by Q101.
The PWM (Pulse Width Modulation) signal is output from IC101 (pin 30) pin and the brightness is changed according to its duty
ratio.
4.2.5.
Data Communication Circuit(USB)
HDV20 has a USB-HUB IC(IC103) and the USB interface supports the full-speed data rate of 12 Mbit/s.
(HDV230 base unit <--> HDV20 unit, Upper HDV20 unit <--> Lower HDV20 unit)
Up to 5 tally units can be connected by cascading.
(HDV230 base unit <--> HDV20 unit, Upper HDV20 unit <--> Lower HDV20 unit)
Up to 5 tally units can be connected by cascading.
nLCD_CS
nLCD_RST
LCD_SCL
LCD_SID
LCD_CD
LCD_BL
IC101
10
9
8
4
3
30
nLCD_CS
LCD_CD
nLCD_RST
LCD_SCL
LCD_SID
DG
3.3V
DG
CN101
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
LCD_TEST
C149
C150
C148
DG
C146
L106
C163
DG
C164
DG
L110
R162
L204
R161
C128
C166
C167
DG
DG
R158
C147
LCD_BL
5V
DG
TP_LCD_A1
DG
R138
TP_LCD_K1
C112
L114
R137
LCD_BLA
LCD_BLK
Q101
C165
D627
D626
SLCD_A
SLCD_K
D625
D628
R625
R626
R627
R628
Self-Label Back Light
UPPER DSS
or HDV230
JK101
LOWER DSS
JK102
USB HUB
IC103
USB_1
USB_2
DCX81
IC101
USB_3
VBUS_IN
VBUS_OUT
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