1, the shell of the equipment is charged with the phenomenon of inspection order The shell of the equipment is charged — whether the power supply circuit is damaged — whether the line phase is correct, whether the grounding of the equipment is correct — whether the voltage is correct 2, the sound system volume is not enough The device volume less than — line level amplifier and speakers are properly set — speaker wire connection is solid phase — the amplifier and speakers are the same — equalizer attenuation amplitude limiter is appropriate for — the control level is exactly 3, resonance and feedback in the sound field Resonance and harmonic feedback — check room frequency response is a peak point — room structure and decoration is reasonable — frequency points and bass gain is reasonable — room reverberation time is too long 4, the interference noise The sound system has the noise — the light modulation interference — the sound and the light source are separated — the light power source and the control line are too close to the audio signal line — whether the silicon box is too close to the audio equipment The speaker system has noise — the transmission of the signal is reasonable — the shielding of all signal lines is appropriate — signal grounding is correct — all audio equipment power phase consistent 5, lights out of control Light control &mdash controller program; whether the correct &mdash address encoding lamp is correct; — control line connection is correct — shielding control line whether adverse or interference — limit adjustment of the proper &mdash lamps; lighting power supply switch contact is good 6, computer lamp bulb often damaged (750 hours) &mdash light bulb is easy to install; whether the installation is solid and contaminated with dust and water vapor — light bulb is good — voltage is normal — power switch is frequent 7, the video image is not normal The video image is not normal &mdash program is correct; standard — equipment housing is charged — signal shielding is subject to high level interference &mdash projection tube is normal; — performance of liquid crystal projection lamp is poor 8, wireless microphone sound instability The voice is not stable — whether the system has a high frequency interference source — antenna connection is correct — receiver fine tuning is correct — the number of microphones is over — microphone battery power shortage.
