DP770 Service Manual
Audio Frequency Voltmeter
Frequency: 50Hz-10KHz
Voltage: 1mv-10v
Tone Generator
Frequency: 50Hz - 5KHz or higher
Distortion Meter
Power: when 1KHz, ≤3％
Output Voltage 5v- 30v, current:5A
1 The radio cannot be powered on.
A．The battery may be used up. Recharge it or change the battery to try again.
B．The power ON/OFF key may suffer from poor contact. Clear the metal dome with alcohol and try again.
C．The power binding post isn’t connected with battery. Re-install it and try again.
D．The power is connected inversely which leads to the power protective tube F901 open. Replace the protective tube F901 and try again.
2
You cannot communicate with
other members
A．The frequency settings may be different from others. Set your TX/RX frequencies to be the same as others.
B．The CTCSS/CDCSS signaling may be different from others. Set your CTCSS/CDCSS signaling to be the same as others.
C．Your place may be too far away from the others, beyond the radio’s coverage area.
3 The radio cannot receive signals
A．The antenna may get looser or may be improperly installed. Re-install the antenna.
B．The frequency settings may be different from others. Set your TX/RX frequencies to be the same as others.
C. Your place may be too far away from the others, beyond the radio’s coverage area.
4
During receiving, LED is green
but no voice.
A．Check whether the volume is smallest or not. If so, increase the volume.
B．Check whether the speaker is broken or not. If so, change the speaker.
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