Voice of Phoenix as 90 development of domestic audio brand, amplifier, CD player has a good market, with most of the decline of the domestic brands, less sound of chicken products, but service is frequently encountered in the amplifier, such as voice of the Phoenix 286 is a popular cheap amplifier.qcEservice manual download site
Phoenix voice amplifier, safe, efficient, on-site service, professional technical support ... Maintenance models include: A92, DH – 999, the little Prince, Prince and other full range amplifier, CD player.qcEservice manual download site
Voice of Phoenix 286 amplifier repair: a case reportqcEservice manual download site
Symptom: power on, power on the rear left and right channels correctly, right channel volume accompanied by rustling noise and distortion. Balancing potentiometers response but no change.qcEservice manual download site
Maintenance: measuring balance electrical goodqcEservice manual download site
, Output relay good crisp point, measured positive and negative voltage level to normal, after the input audio level switch, is still the right channel is not normal, indicating fault in amplifier stage. Detection amplifier tube, push tube are no exception, measured the working point of the amplifier stage, found that Zener diode D005 voltage deviations, measure the diode has a short circuit, replace voice returns to normal.qcEservice manual download site
qcEservice manual download site
Feng cec3300CD of machine repair: a case reportqcEservice manual download site
Symptom: after booting the screen light show a straight line, operation keys are invalid.qcEservice manual download site
Maintenance: measuring output transformer and rectifier voltage are normal,qcEservice manual download site
Display for the measured 28 volts-30 volts, there should be no problem. Observe the machine shows no signs have been repaired, analysis screen is not lit should be concerned with the drive circuit, but don't know the circuit, to start. They look up the circuit to, only to find the circuit board has a liquid corrosion, water-free alcohol after cleaning try successful elimination of machine fault.qcEservice manual download site