A preliminary estimate fault may be as time switch preset improperly or improper/unloading mechanism within the warehouse. HKgservice manual download site
Plug in the power supply plug, check the panel switch preset position. When clicked "VTR +" button, there is a little red alarm clock shape marks and alternate beating time/week show, this shows that the machine is in a state of "time" video. By the "time" video switch "ON" position to "OFF" position, take positions has been properly add/unloading. Plug in the TV, replay the tape in full screen clutter (different from the ordinary no signal noise point), cannot appear normal image, but the basic normal tape and audio. Analysis is not tape and tracing the cause of the poor (turn the TRACKING button is invalid), and then open the top cover plate, carefully observe the drum, no obvious dirt, just have a head has defects, estimation is caused by the improper cleaning. Change a new drum (model VJB0001b), image has improved, but still some noise and noise, and in the process of tape, failure occurs when weight is light, adjust the acoustic head height, Angle, azimuth Angle, horizontal position are invalid, doubt go with tape tension system has a problem, try to push tension arm, change the tape tension in the process of operation, significantly reduce breakdowns. Check the tension system, found that the tension arm drawing copper belt felt is off, use AB glue stick felt in situ, after curing and replay the tape, and further adjust the acoustic head (because replacement live drums, if not adjusted to track the bad), images, audio, essentially normal. HKgservice manual download site
Found further examination records systems, such as the input signal from an audio and video input pin for recording, everything was normal, and directly recorded by the TV receiving system into the signal of the machine, the image is normal but no sound, carefully check the audio channel, the results for the audio input pin in the switch is bad, after adjustment and repeatedly plug, replay all normal.

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