Sharp VL-A111UL Service Manual - Page 17

Adjustment Of Mechanism Tape Running System

Get Sharp VL-A111UL PDF manuals and user guides View all Sharp VL-A111UL manuals
Add to My Manuals
Save this manual to your list of manuals

Page 17 highlights

VL-A111U/AH131U VL-AH151U/AH161U 5-4. ADJUSTMENT OF MECHANISM TAPE RUNNING SYSTEM 5-4-1. Preparation for adjustment (1) Clean the tape running areas (guide poles, rollers, drum, ,, Capstan shaft, Pinch roller) (Figure 1) ,, (2) Connect the oscilloscope to the following TPs. Sup tilted pole Tu GR Sup GR Tu tilted pole A Tu tilted pole B Si roller Capstan shaft RF output ..... TL7410 ,, ,,,, H-SW-P ....... TL7417 ,,,, GND TL7413 Drum Tu guide ,,,, (3) Playback the alignment tape (VR2ABOPS). (4) Ascertain that each guide is free from remarkable curl. Tension pole Pinch roller ,,,,,,,, (5) Ascertain that the RF waveform of inlet and outlet sides is flat on the oscilloscope (Figure 2, (a)). Unless the waveform is flat, (Figure 2, (b), (c)), make an adjustment as follows. Reel 5-4-2. Adjusting the Sup GR and Tu GR Tape running system (Figure 1) (1) Turn the Sup and Tu guide rollers to get the flat waveform at the inlet and outlet sides. Inlet side Outlet side (a) Normal (b) Inlet side waveform is disturbed. Figure 2 (c) Outlet side waveform is disturbed. 5-4-3. Adjusting the Si roller height After replacement of the Si roller preset and adjust the Si roller height. (1) Si roller height presetting Adjust the height from the upper surface of mechanism chassis to the upper surface of lower flange with the aid of jig. Then lower it by 90° (clockwise). Lower flange Upper flange Height adjusting jig Master plane (JiGMP-MX7U) Figure 3 (2) Adjusting the Si roller 1 Playback the tape to set the V/SR mode. 2 Ascertain that the tape is not folded on the lower flange (B) of Si roller. (Figure 4) If tape folding is found, turn the upper flange (A) of Si roller with the driver (clockwise) to eliminate the folding. 3 Playback the alignment tape (VR2ABOPS). 4 Adjust the Sup GR and Tu GR by the procedure described in section 4-2 above. 5 After V/S F,R perform playback so as to ascertain that the waveform rises horizontally within 2 seconds. 6 Unless the normal waveform is obtained (Figure 5), turn counterclockwise the upper flange (A) of Si roller, and repeat the step (5) above. Repeat the steps (5) and (6) until the normal waveform is obtained. At this time ascertain that the inlet travel does not change in the normal playback state. If any change is found, adjust the Sup GR, and redo the step (5). Si roller Rise waveform Upper flange (A) REV mode Lower flange (B) Tape must be free from foldeng. Figure 4 17 REV OK Playback REV NG Playback Figure 5

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
17
VL-A111U/AH131U
VL-AH151U/AH161U
5-4. ADJUSTMENT OF MECHANISM TAPE RUNNING SYSTEM
5-4-1. Preparation for adjustment
Tape running system (Figure 1)
Drum
Reel
Tension pole
Si roller
Sup GR
Sup tilted pole
Tu tilted pole A
Tu GR
Tu tilted pole B
Capstan shaft
Tu guide
Pinch roller
5-4-2. Adjusting the Sup GR and Tu GR
(1) Turn the Sup and Tu guide rollers to get the flat waveform at the inlet and outlet sides.
Inlet side
Outlet side
(a) Normal
(b) Inlet side
waveform is disturbed.
(c) Outlet side
waveform is disturbed.
Figure 2
5-4-3. Adjusting the Si roller height
After replacement of the Si roller preset and adjust the Si roller
height.
(1) Si roller height presetting
Adjust the height from the upper surface of mechanism
chassis to the upper surface of lower flange with the aid of jig.
Then lower it by 90
°
(clockwise).
Upper flange
Lower
flange
Height adjusting jig
Master plane
(JiGMP-MX7U)
Upper flange (A)
Si roller
REV mode
Lower flange (B)
Tape must be free from foldeng.
(2) Adjusting the Si roller
1
Playback the tape to set the V/SR mode.
2
Ascertain that the tape is not folded on the lower flange (B) of Si roller. (Figure 4)
If tape folding is found, turn the upper flange (A) of Si roller with the driver (clockwise) to eliminate the folding.
3
Playback the alignment tape (VR2ABOPS).
4
Adjust the Sup GR and Tu GR by the procedure described in section 4-2 above.
5
After V/S F,R perform playback so as to ascertain that the waveform rises horizontally within 2 seconds.
6
Unless the normal waveform is obtained (Figure 5), turn counterclockwise the upper flange (A) of Si roller, and repeat the step
(5) above. Repeat the steps (5) and (6) until the normal waveform is obtained. At this time ascertain that the inlet travel does
not change in the normal playback state. If any change is found, adjust the Sup GR, and redo the step (5).
Figure 3
Rise waveform
REV
OK
Playback
REV
NG
Playback
Figure 4
Figure 5
(1) Clean the tape running areas (guide poles, rollers, drum,
Capstan shaft, Pinch roller) (Figure 1)
(2) Connect the oscilloscope to the following TPs.
RF output
.....
TL7410
H-SW-P
.......
TL7417
GND
.............
TL7413
(3) Playback the alignment tape (VR2ABOPS).
(4) Ascertain that each guide is free from remarkable curl.
(5)
Ascertain that the RF waveform of inlet and outlet sides is flat
on the oscilloscope (Figure 2, (a)). Unless the waveform is
flat, (Figure 2, (b), (c)), make an adjustment as follows.