In accordance with the overhaul "three principles", to test the power supply voltage, no exception. Watch the camera outside the switch in the normal position. Test B30112, 27 feet input signal waveform is normal, the test B301 H, 17 (4) the feet CP, 23 feet FH / 2, 16 feet FCK12.875 MHz waveform are. Most digital integrated circuit test 3 carefully each pin voltage is normal. On the premise of normal power supply, touch the surface of the chip temperature and no obvious change, little chance of chip damage. Therefore should inspect the peripheral circuit, with a magnifying glass, really watch (VEF23146B) each chip pins on the board and the circuit board found no fracture phenomenon. Test waveform channel, again found IC307 (MN655431) A/D conversion chip (3) ~ attending feet sent to IC306 (MN6732) digital processing chip 28 ~ 21 feet waveform is normal. And IC306 79 ~ 72 of 69 ~ 62, the waveform of the output is not normal. VGdservice manual download site
 VGdservice manual download site
 VGdservice manual download site
Subjective view IC306 internal damage, replace IC306 there is also a failure, after that IC306 was not damaged. To continue to check each device inadvertently test IC309 external crystals (MNl882010VON) 29, 30 feet X301, found that the oscillation waveform is very messy, is suddenly enlighted, is bad for the microprocessor clock, makes the control signal is abnormal, or does not work. So in another M9000 type machine remove crystals X301 (E - FOV8004EOA), after the replacement boot that emerge in the viewfinder image.VGdservice manual download site