Adjusting the Digital Video Cassette Camera with JVC Service Support System Software
87
24.
Select Viterbi OFF in the Inspector window.
25. Click the FA Deck tab in the Deck Controller window. Play the scenes just
recorded on tape.
26. Monitor the Error Count TTL in the Inspector window. Notice which
section of the tape and its Head Record Current value results in the lowest
error rate. When judging the error rate, average the values over a short
period of time; for example one minute. Do not pay attention to an
occasional jump in values as it is most likely just caused by variations in the
tape surface.
27. Click the FA Camera tab in the Deck Controller window to put the unit in
the Camera mode.
28. Click the SP Tape Speed option button. Then click the Record Start/Stop
button in the Deck Controller window to start recording in the SP mode.
29. Open the Adjustment Utility window.
30. Select the Head Rec Current procedure in the list box.
31. Click the Start button in the Adjustment Utility window. The Confirmation
window appears.
32. Click the Yes button in the Confirmation window. The Editing window
appears.
33. Click on the Arrow buttons in the Editing window to set its value to the one
that has the lowest Error Rate.
34. Then click the OK button in the Editing window. The Information window
appears.
35. Click the OK button in the Information window.
The Error Rate for each head should be below 498.
If the error rate exceeds the maximum allowable values, the head and tape
transport system should be cleaned.
If the error rate still exceeds the maximum allowable values after cleaning,
perform the Linearity Adjustment. Then perform the VCO Center Frequency
(ME Tape, SP Speed)Adjustment using the Alignment tape to roughly adjust the
VCO Center Frequency. Then perform the Head Record Current Adjustment
again followed by the VCO Center Frequency (ME Tape, SP Speed) Adjustment.
If the error rate still exceeds the maximum allowable values, you should
consider that the head may have failed or the preamp shield is loose.
Best results are obtained when the camera is fully assembled prior to starting
the adjustment.
Strong radiation in close proximity to the camera such as a computer or video
monitor will affect the error rate reading. Usually giving a false higher error
rate.
This completes the Head Record Current adjustment.
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