DP405 Service Manual
U21 LT1901A MCU
IC200 24LC512 E2PROM，
saves channel frequency data, feature parameters and
modulation parameters
U3 TDA8547TS Receiver audio power amplification
Q500 RD07S2B TX final power amplification
Q4 DTA144EE APC output switch
Q507 3SK318 Receiver power amplifier
Q200 DTC144EE Red LED driver
Q201 DTC144EE Green LED driver
Q501 RD01MUS1 Transmitter power amplifier drive
Q601 DTC144EE Audio power amplifier control switch
IC100 XC6204B50
2MR
5R,5T voltage output
IC102 MP2359 3.5V voltage DC-DC output
U20 MCP4802 DA chip, used for modulation of power and frequency stability
Q602 Q603 ST3400SRG Audio output control switch
IC302 NJM2904 Operational amplifier IC, used for MIC signal amplification
Q502 2SC5108 Transmitter 1st amplification
Q503 2SC3356 Transmitter 2st amplification
4. Feature Description and Parameter Setting
4.1. Kill and Remote Monitor
Kill
Check this option to receive Kill command and the radio will be disabled.
Kill Decode
Check this option to receive Revive command and the radio will be restored to normal.
Remote Monitor
When the radio receives Remote Monitor command, it will automatically turn on the transmitting and the
monitoring party can listen to the surroundings around the monitored radio.
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