When commissioning the power, please pay attention to first turn the knobs of all the devices to the minimum position, and turn on the power step by step from the previous stage to the next stage, so as to avoid excessive noise during the startup and cause noise and damage to the machine. Adjust the input of all sources to the appropriate size, monitor the speakers for distortion and noise, and the sound is too small. If it can be turned on normally, it can work for one hour at normal volume and then listen to whether the sound has changed or not. The surface temperature of the machine is normal. If normal. The debugging work can be ended. Otherwise check the problem.
The following points should be noted when debugging:
1. Rotate the knobs of all the devices to the minimum position first, and turn on the power in order from the front to the rear, so as to avoid excessive shock during start-up, noise and damage to the machine 2. Adjust the input of all the sources. To the appropriate size, monitor the speakers for distortion and noise, and the sound is too small
3. If it can be turned on normally, press the normal volume for one hour and then listen to the sound. Does the machine surface temperature be normal? If normal. The debugging work can be ended. Otherwise check the problem.
First, transmission line inspection
The broadcast transmission line is divided into indoor and outdoor wiring. When checking, the terminal of the line to be inspected should be disconnected from the equipment. Check whether the transmission wiring of each line is correct according to the construction drawing and the broadcast system diagram. Is there a short circuit? Faults such as open circuit and mixed line; whether the terminal number is complete and correct, and whether the terminal is soldered. Exclude the discovered faults one by one, and re-tighten the connection terminals; whether the connection of each plug and socket is welded, whether the wiring is correct and reliable, and whether the shielding layer is intact and in good condition.
Second, the mating check
Check whether the matching of the inter-line transformers on each circuit or the speaker equipment is correct according to the construction drawing. In particular, the connection terminals of the multi-tap transformer are often easy to be connected incorrectly. Pay attention to check for missing and multiple connections, and the primary secondary connection phenomenon of the transformer. According to the diagram, check whether the transformer model, capacity and impedance match,
Third, the insulation resistance measurement
Disconnect the two terminals of the broadcast line and measure the insulation resistance between the lines with a 500V megger. The measurement items are: wire and wire and wire and ground insulation resistance, the insulation resistance is generally not less than 0.5MΩ, the resistance of each circuit should be measured by sub-loop, the measured value should be filled in the record, and the contents of the commissioning report should be kept in the construction unit. .
Fourth, grounding resistance measurement
The grounding resistance of the broadcasting system is mainly performed on the grounding pole of the broadcasting room; the grounding resistance tester is used for the measurement. The power frequency grounding resistance of the broadcasting room amplifier, lightning arrester, etc. is generally not more than 10 Ω. When the capacity of the broadcasting system is above 150 W, if a grounding pole is set separately, it is possible to use a set of grounding poles with the electrical device, but this kind of grounding The required grounding resistance should not be greater than 4 Ω and a dedicated grounding trunk should be provided.
Five, power test
For the measurement of the AC power supply voltage, the power supply line should not be short-circuited or disconnected. Perform the on-off operation test on the power switch, check the power supply display signal; check the test of the standby power exchange device, measure the output voltage of the battery; The device performs inspection and measurement; performs a simulated power failure test to verify whether the power supply mutual investment device can work reliably.
Sixth, system opening test
All the problems found in the above-mentioned inspections have been completely revised. After all the inspection tests meet the requirements, the system opening test can be carried out. The opening test of the system should be divided into equipment and one by one. First disconnect all output lines, pull out all input signal plugs, turn the amplifier's "volume" knob to the minimum, turn on the power, turn on the amplifier switch, observe whether the display signals are normal, and there is inorganic noise.
2. The preamplifier is turned on.
When the amplifier is turned on and everything is normal, the preamplifier can be turned on. Turn on the preamplifier power supply, observe the various displays, and turn on the connection between the preamplifier and the power amplifier.
3, microphone test
When the amplifier and preamplifier are working properly, turn the "volume" knob of the preamplifier and amplifier to the minimum, insert the microphone plug, give the microphone an audible signal, adjust the "volume" knob, and listen to the sound output on the monitor headphones. At this point, the "function" knob of the amplifier or preamplifier is turned to the microphone position. After the test of one microphone jack, the same method is used to test each microphone input channel.
4, recorder input
Turn the preamplifier or amplifier "function" knob to the recorder input and turn on the recorder input circuit, play the tape, adjust the "volume" size, and observe the input signal, distortion and noise.
5, receiving tuner opening test
Turn on the tuner power, receive the broadcast program, test the reception situation, and repeatedly adjust the direction of the FM receiving antenna according to the receiving effect of the FM radio to obtain the best listening effect. And observe the interference and distortion.
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