Furuno Navtex NX-700-A, Service Manual

Page: 79 / 142

5.3 Block Description
5-8
5.3.2 Display unit
1. CPU board (08P3225)
The CPU board is comprised with CPU block and Power supply block.
Main specifications of CPU block are shown below.
Table 5.3.1 Main specifications of CPU block
Item Specifications
Set ID storage time One year or more (After power OFF)
Number of stored IDs 200 x 2 channels
Number of stored messages 200 messages x 2 channels (100,000 characters x 2 channels)
LCD display unit
240 x 320 dots (5-inch LCD), message display:
- 38 characters x 19 lines (Font size: Small)
- 33 characters x 16 lines (Font size: Standard)
- 19 characters x 9 lines (Font size: Large)
External input/output
- Output: IEC61162-1/2 (INS)
- Input: I EC61162-1/2 (GPS, INS)
- Output: Alarm (Normally open)
- Input/output: Printer
CPU block
The CPU displays received messages by converting BY signals of NAVTEX into
4B-3Y. And communication with the RCV board and the INS (Integrated Navigation
System) is performed via RS-485.
U13 EEPROM stores setting values.
U10 SRAM can store up to 200,000 characters of received messages. The received
messages are backed up by a battery BT1 (600 mAh). The life of the battery is 5 to
10 years depending on usage conditions. When the capacity of the back-up battery is
reduced,
icon appears in the status field of the received message list screen.
The popup window of “Battery Error” is also displayed. See page 7-20.