Sharp VL-E610S Service Manual page 24

VL-E610S/VL-E610H
VL-E660S/VL-E96E
VL-E98E
(2) Adjusting the Tu guide
1 Playback the alignment tape
2 Check that the tape runs at the same height near the capstan shaft in case of V/S F and V/S R.
3 If the tape running position in case of V/S R is higher than the tape running position in case of V/S F, turn clockwise
the Tu guide nat.
If the tape running position in case of V/S R is lower than the running position in case of V/S F, turn counterclockwise
the Tu guide nat.
4-4-5. Checking the V/S F and R waveforms
(1) Playback alignment tape (VR2DBOPS), and set the V/S R mode. At this time ascertain that the waveform crest pitch
is kept constant for more than 5 seconds.
(2) Set the V/S F mode. At this time ascertain that the waveform crest pitch is kept constant for more than 5 seconds.
Unless the constant pitch is obtained, execute the checks of Section 3-2, 3, and 4.
4-4-6. Checking after adjustment
(1) Envelope check
1 Playback the alignment tape (VR2DBOPS).
2 Ascertain that the envelope maximum to minimum ratio is 65% or more. (Figure 9)
3 Ascertain that the waveform does not change remarkably. (Figure 10)
.
(VR2DBOPS)
Capstan shaft
Pinch roller
a
E E
M I N M A X
E
M I N
65 (%)
E
M A X
Figure 9
Nat
Figure 7
b c d
a b c d
Figure 8
4-10
C
A
C
C 1/8A
Figure 10