DP405 Service Manual
Oscilloscope DC 30MHz
High-sensitivity frequency
Counter
Frequency range:50Hz - 10KHz
Frequency stability:0.2ppm or lower
Ammeter 5A
Audio frequency voltmeter
Frequency range: 50Hz - 10KHz
Voltage range: 1mv - 10v
Audio generator
Frequency range:50Hz - 5KHz or higher
Output:0 -1v
Distortion tester
Capacity:at 1KHz, ≤3％
Input level :50mv - 10vms
Spectrum analyzer Measurement range:DC to 1GHz or higher
Path generator
Center frequency:50KHz - 600MHz
Output voltage:100mv or higher
13.16Ω dummy load Around 16Ω，3W
Adjustable power 5v - 10v, around 5A
9. Troubleshooting
No. Description Cause and Solution
1 Failed to power on
the radio
A．The battery may be in low power. Change toa new battery or
change the battery.
B．The power switch is broken. Change to a new one.
C．CPU is broken. Change to a new IC.
2 PLL lost lock
A．PLL xrystal oscillator X500 is broken. Change to a new one.
B. RDA1846S is broken. Change to a new one
3 Failed to talk A．The frequencies on both parties are different. Choose a channel
of the same frequency.
B. The two parties have different CTCSS/DCS. Reset CTCSS/DCS
C．Beyong the communication range.
4 Failed to receive
signal
A．Improper antenna contact. Fix the antenna tight.
B．The sensitivity is low. Adjust the sensitivity in tune mode.
C．the squelch level is high so the squelch cannot be turned on.
Reset the squelch level.
5 The red indicator
A．Power amplifier has no power output. Change to a new amplifier.
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