Hytera RD988 - Alarm Information; Over Temperature Alarm

Service Manual
6.1.3 LCD Display
To enhance LCD refreshing rate, parallel data interface is used. It connects to EMIFS data bus of TX
OMAP5912 (U102) and the chip select is subject to the control of
FLASH.CS2 . See the following figure:
6-3 LCD Control Diagram
6.1.4 LED Indicator
The 9 LED indicators on the front panel are controlled by the IO chip (U1), while the backlight of LCD
and keypad is controlled by the IO chip (U401) of baseband board. See the following figure:
GPIO42(W16)
GPIO56 (V15)
GPIO5(P3)
74HC594
U1
DAT
CLK
EN
TX OMAP5912
U102
DAT
CLK
EN
74HC594
U401
GPIO39(AA15)
S/P_DAT
S/P_CLK
LED_S/P_EN
PWR_LED_CTRL LOGIC
BASEBAND
BOARD
FNT BOARD
DIGITAL
TX-A
RX-A
TX-B
RX-B
ANALOG
RPT
ALARM
BACK LED_CTRL
PWR_LED_CTRL
Blue LED
Red LED
Green LED
Red LED
Green LED
Yellow LED
Green LED
Red LED
Backlight LED
Red and
Green LED
Figure 6-4 LED Control Diagram for the Front Panel
6.1.5 10-Pin Interface
The 10-Pin interface on the front panel is used to connect the audio accessory or data cable. Its
definition is as below:
Pin No. Name Description
1 Accessory identification port 1 To form an accessory identification
D7-FLASH.D0
FLASH.OE (U4)
FLASH.WE (W2)
FLASH.CS2 (M4)
FLASH.A1(J8)
OMAP5912
U102
LCD
Interface
J1
A
1
CS
WE
BOARD
Front
Panel
D07D0
−
Baseband
Board
BOARD
OE
7