Sharp VL-E610S Service Manual page 22

VL-E610S/VL-E610H
VL-E660S/VL-E96E
VL-E98E
4-4. ADJUSTMENT OF MECHANISM TAPE TRAVEL SYSTEM
Si roller
4-4-1. 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.
RF output ... TL3306
H-SW-P ...... TL405
GND ........... TL3318
(3) Playback the alignment tape (VR2DBOPS).
(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.
4-4-2. 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.
Sup tilted pole
Sup GR
Tension pole
Tape travel system (Figure 1)
Inlet side
Tu tilted pole A
Tu GR
Drum
Reel
Outlet side
(a) Normal
(b) Inlet side
waveform is disturbed.
(c) Outlet side
waveform is disturbed.
Figure 2
4-8
Tu tilted pole B
Capstan shaft
Tu guide
Pinch roller