Sony DCR-TRV725E, Руководство по обслуживанию

Страница: 242 / 249

— 38 —
5-4-4. CUE and REV Waveform Check
(Refer to Fig. 5-8)
1) Playback the tracking alignment tape WR5-1NP (NTSC), WR5-
1CP (PAL)(Ref. No. J-6) and enter the REV mode.
Confirm on an oscilloscope that the pitches between the peaks
of the RF waveform are equally spaced for 5 seconds or more.
If pitches between peaks of the RF waveform are not equal,
perform sections “5-4-2 Tracking Adjustment” and “5-4-3 No.
7 Guide (TG7) Adjustment”.
2) Enter the UCE mode. Confirm on an oscilloscope that the
pitches between the peaks of the RF waveform are equally
spaced for 5 seconds or more.
If pitches between peaks of the RF waveform are not equal,
perform section “5-4-2 Tracking Adjustment”.
5-4-5. Check upon Completion of Adjustment
5-4-5-1. Tracking Check
1) Playback the tracking alignment tape in the PATH mode.
Compare the amplitude of the RF waveform in the AUTO
tracking mode and with that in the PATH mode. Confirm that
the amplitude of the RF waveform decreases to about 3/4 when
the tracking alignment tape is switched from the AUTO tracking
mode to the PATH mode. (Refer to Fig. 5-9)
2) During step 1, confirm that the minimum amplitude (E
MIN
) is
65% or more of the maximum amplitude (E
MAX
) of the RF
waveform. (Refer to Fig. 5-10)
3) Confirm that the RF waveform does not fluctuate too
excessively.(Refer to Fig. 5-11)
Fig. 5-8.
Fig. 5-9.
Fig. 5-10.
Fig. 5-11.
3/4 A A
E
MIN
E
MIN
E
MAX
E
MAX
65 (%)
A
C
C
C 1/6 A
a b c d