Overhaul of common faults of car audio
1. Fault phenomenon: No sound when receiving FM reception of Hongle HL509 advanced car audio.
Analysis and maintenance: As the AM band reception is normal, it indicates that the shared power supply is normal. The fault is in all levels of the FM receiving circuit. Among them, the pin ⑨ of IC101 (TA8122AN) is the output terminal of the AM detection or FM frequency discrimination signal. Therefore, the fault should be in the pre-stage signal processing of IC101 pin ⑨, such as FM mid-amp, FM local oscillator, FM high-amp circuit. When the screwdriver touches the input terminal of the frequency modulation signal input of IC101 pin ⑥, the interference noise from the horn is weak, and the input and output pins of the filter CF201 are shorted with tweezers.
2. Failure phenomenon: Hongle HL509 advanced car audio FM / AM band can not be converted between each other.
Analysis and maintenance: The specific manifestation of the fault is that when the band switch is switched to the AM receiving state, the FM band program is still received to 4. According to the investigation, the pin ⑧ of IC101 is the input terminal of the AM / FM band switching control signal, and its voltage is measured as the FM receiving voltage of about 3v south, and it should be about 7v of the amplitude receiving voltage when normal. It is suspected that the internal contacts of the band wind switch are bad. After repeated cleaning with alcohol, the test machine works normally and the fault is eliminated.
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