Panasonic NV-M1000 camcorder to box keys with warehouse cannot eject fault repair method |
| Time£º2014-06-29 09:44:52 Source£ºNetwork Author£ºUnknown Clicks£º1312 |
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Xbjservice manual download site
Xbjservice manual download site
With reference to the appended drawings, cut off power supply. Using model 500 multimeter to check the main servo IC IC2001 / MN67461VDJF feet in the right way forward and reverse resistance found no obvious problem, turned on the power switch, in stop state, check the IC2001 feet of voltage, measured 13 feet and 17 feet REGSV normal voltage (VCC). Check the 37 feet (drum phase error output) and 40 feet (dominant axis error output) between 2.2 ~ 2.4 V voltage swing, normal value shall be the stability of 2.5 V, drum phase comparison and main shaft phase comparison circuit doesn't work normally. In replay mode, drum phase comparison and main shaft phase comparison reference signal from the luminance, chrominance signal processing circuit of the 4.43 MHz crystal oscillator frequency signal, if the reference signal is missing, can appear the fault phenomenon. Using oscilloscope to observe IC2001 24 feet without 4.43 MHz signal input, the oscilloscope probe will be moved to the brightness, chroma signal processing circuit IC8001 / M52059AFP32 feet or test point TP8003, monitoring and no 4.43 MHz crystal oscillator signal waveform display, repeatedly turned on the power switch oscillation signal to appear on the oscilloscope waveform after several times, but the unstable oscillation signal waveform, about 2 minutes gradually returned to normal. Estimate the failure is due to the 4.43 MHz crystal oscillator internal performance deteriorate. Change the crystal oscillator. After X8001 switch power supply is connected. Machine back to normal.Xbjservice manual download site
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