By listening to the sound re-recording later, surprised to find that the sound is not muffled sound re-recording, but the original audio signal on the tape is not properly eliminated. The DVR is recording, magnetic bias was observed with an oscilloscope output of the oscillator and found no bias magnetic oscillation signal; measured with a multimeter bias magnetic oscillation circuit voltage is almost zero, the measured IC4001 28-pin voltage is 12.2V, 27 pin voltage is 0.2V, 25-pin voltage is 10.2V. In the video, 27,25 feet should were high, low. Pressing the recording button (REC), the system control microprocessor normal level ICl6001 67 may change, and no change in base potential QR4001, IC6001 67 seen from the feet to the base line between QR4001 has tripped. The inspection found that the line has a positive and a negative cable soldered circuit boards, soldering good after troubleshooting.hEiservice manual download site

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