Sharp VIEWCAM VL-WD650U, Service Manual

Page: 10 / 133

10
VL-WD650U
6. INSPECTION AND MAINTENANCE ITEMS AND INTERVALS
In order to keep the mechanical section always in good condition, perform the following inspection and maintenance at regular intervals.
In addition, after repair, perform the following maintenance items regardless of how long the user has been using the unit.
6-1. List of inspection and maintenance items
Inspection and
Time of use (h)
Symptoms that indicate
Remarks
maintenance location
500 1,000 1,500 2,000 3,000
need for maintenance
Tape running section (see section 8-3)
Drum section, Video head
(see section 8-3)
• Block-type noise
• Head hole clogging
• Tape damage
<Rollers>
• Replace if there is anything abnormal in the rotation, or if there is run-out
(that becomes large).
<Other than the above>
• Clean the section that contacts the tape (especially the lower drum helical
section). Use the specified cleaning liquid.
• The tape fails to run.
• The tape becomes slack.
• Block-type noise
• Abnormal noise
Timing belt
Pinch roller
Capstan motor
• Replace if there is anything
abnormal.
Swing arm
S reel base, Tu reel base
Center pulley shaft
Intermediate pulley shaft
Swing arm boss
Intermediate gear A shaft,
Intermediate gear B shaft
Tape running system
• • • Replace. • • • Clean. • • • Lubricate. • • • Check.
Note:
Replace the drum ass'y if the
video head is cleaned but the
envelope still does not appear.
(When the envelope is normal,
refer to "11. USEFUL TIPS".)
• Lubricate with oil.
[Oil]
Cosmo Hydro HV22
Note: Apply oil to the shaft, then
wipe lightly with a cloth.
•
Abnormal noise
Loading motor
Mode switch • Cannot eject.
• Fails to enter a mode.
• The tape fails to run.
• The tape becomes slack.
• Tape damage
• The play-back image is
abnormal
.
Abnormal noise
PB · VS/R winding torque
PB · VS/R · loading back tension
Tu reel base ratchet torque
S reel base no-load torque
• Replace any part that fails to
perform within the standard.
• Replace if anything is abnormal
(including the noise).
Performance checks
[Oil] Cosmo Hydro HV22
[Grease] Moly Coat YM-103
[Screw lock] Three Bond 1401B
[Cleaning liquid] Industrial-use ethyl alcohol
Drive system
6-2. Precautions
(1) When replacing any part, always replace the cut washer that was
removed with a new one.
(2) This mechanism does not have control adjustment. If the control
cannot be set as required, clean and or replace parts.
(3) On the oil
a) Always use the specified oil. (Using another kind of oil can cause
various kinds of trouble.)
b) Always use clean oil, without any mixed-in dirt, to lubricate bearings.
(Using oil with dirt mixed in can cause the bearings to wear or to
stick.)
c) One drop of oil is the amount shown in the Fig. 1, on the point of a
pin.
(4) Perform circuit repair, tape running adjustment, etc. with the cassette
controller assembly attached to the mechanism.
(5) When operating the mechanism separately, apply voltage to the
loading motor. However, the terminal voltage must be DC3V~4V.
(When the mechanism is connected to the main PWB, do not apply
external voltage to the loading motor. It may cause a trouble.)
(Forcing the gears to turn by hand entails danger of breakage.)
If the mechanism is separated from the unit, the capstan motor may rub
and be damaged if spacing under the mechanism is inadequate.
(6) To install the cassette controller, push section A in the Fig. 2. Do not
push anything else.
(7) Do not deform any of the mechanical parts.
Oil
1.5mm diameter or less
Fig. 1
Fig. 2
A