Kirisun DP770, Service Manual

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DP770 Service Manual
Audio Frequency Voltmeter
Frequency: 50Hz-10KHz
Voltage: 1mv-10v
Tone Generator
Frequency: 50Hz - 5KHz or higher
Output: 0-1v
Distortion Meter
Power:
when 1KHz, ≤3
％
Input PWL: 50mv-10vms
Spectrum analyzer Range:100-3GHz or higher
16Ω Dummy Load 16Ω, 3W
Power Supply Output Voltage 5v- 30v, current:5A
9. Basic Troubleshooting
No. Problem Causes and Solutions
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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