DP485 Service Manual
I
Contents
1. Overview ...................................................................................................................................................... 1
1.1. Range of Application .............................................................................................................................. 1
1.2. Safety Precaution .................................................................................................................................. 1
1.3. Maintenance Service ............................................................................................................................. 1
2. External View and Keys .............................................................................................................................. 2
2.1. External View ......................................................................................................................................... 2
2.2. Programmable Keys .............................................................................................................................. 3
2.3. LED Indicator ......................................................................................................................................... 4
3. Basic Operation .......................................................................................................................................... 5
3.1. Powering On/Off .................................................................................................................................... 5
3.2. Selecting a Channel............................................................................................................................... 5
3.3. Adjusting Volume ................................................................................................................................... 5
3.4. Initiating a Call ....................................................................................................................................... 5
3.5. Receiving a Call ..................................................................................................................................... 5
3.6. Calling Back ........................................................................................................................................... 5
4. Circuit Description ...................................................................................................................................... 6
4.1. Circuit Diagram of Main Board .............................................................................................................. 6
4.2. RF Circuit Diagram ................................................................................................................................ 6
4.3. Baseband Circuit Diagram ..................................................................................................................... 7
4.4. TX Circuit ............................................................................................................................................... 7
4.5. RX Circuit ............................................................................................................................................... 8
4.6. Power Section ........................................................................................................................................ 8
4.7. IC Description ........................................................................................................................................ 9
4.7.1. Features of AT1846S ...................................................................................................................... 9
4.7.2. Port Description of AT1846S ........................................................................................................ 10
4.7.3. Port Description of Master Chip HS8851 ......................................................................................11
4.7.4. Feature Description of Semiconductor Devices ........................................................................... 15
5. Feature Description and Parameter Setting .......................................................................................... 15
5.1. Stun, Revive and Remote Monitor ...................................................................................................... 15
5.2. Scan ..................................................................................................................................................... 16
5.3. Zones ................................................................................................................................................... 16
5.4. Setting .................................................................................................................................................. 16
5.5. TOT (Time-Out-Timer) ......................................................................................................................... 17
5.6. Emergency Alarm ................................................................................................................................ 17
5.7. Settings ................................................................................................................................................ 18
5.8. Upgrade ............................................................................................................................................... 19
6. Assembly and Disassembly .................................................................................................................... 20
6.1. Installing and Uninstalling the Battery ................................................................................................. 20
6.2. Installing and Uninstalling the Antenna ............................................................................................... 21
6.3. Installing and Uninstalling Belt Clip ..................................................................................................... 22
6.4. Using an Earphone .............................................................................................................................. 22
6.5. Detaching Shell from the Base ............................................................................................................ 23
6.6. Detaching Main Board from the Base ................................................................................................. 23
6.7. Explosion Diagram ............................................................................................................................... 24
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