Sharp VL-A110U Service Manual page 14

VL-A110U/UC
VL-AH130U
5-2. ITEMS AND TIMINGS OF INSPECTION AND MAINTENANCE
The mechanism of VCR needs the following periodic inspection and maintenance in order that it maintains its high quality. Also,
after the machine is repaired, execute the following maintenance and checks regardless of how long it has been used.
5-2-1. Inspection and maintenance list
Checking/Maintenance point
Tape travelling route
(Refer to Section)
Drum (Refer to Section)
Video head
Timing belt
Pinch roller
Capstan D.D. motor
Relay Pulle shaft
Pulle gear shaft
Drive gear shaft
Loading motor
Abnormal sound
PB/VS-REW take-up torque
PB/VS-REW back tension torque
Tu brake
HC (Head Cleaner)
Oil: COSMOHYDRO HV100
Greases: MORYCOAT YM-103/X5-6020
Screw locking agent: THREE BOND 1401B
Cleaning liquid: Industrial-use ethyl alcohol
5-2-2. Notes and cautions
(1) Any cut washers, once removed for parts replacement or for other
reason, must be replaced with new ones.
(2) The mechanism of this VCR does not involve any volume adjustment.
If the specified range is not satisfied, either cleaning or replacing the
parts is required.
(3) Oils
a) Be sure to use the specified oils (different viscosity may cause
troubles).
b) For the bearings, be sure to use oil that is free form dust and other
foreign substances. (Dust or foreign substance contained in the oil
may cause wear or seizure of the bearings.)
c) A drop of oil represents the amount of oil which is held on the needle
top as shown in the figure 1.
(4) The circuit repair must be executed without removing the V frame.
(5) For operating the mechanism alone, actuate it with the motor. The
terminal-to-terminal voltage must be DC4V or less.
(6) When installing the cassette control, press the part A shown in Figure
2.
*Do not press other parts.
(7) Take care so that the whole mechanism is not deformed.
Usage time (hrs.)
500 1,000 1,500 2,000 3,000
: Replace.
: Clean.
: Apply oil.
: Check.
14
Possible symptom
encountered
• Lateral noise
• Unclean head
• Screen shaking
• Improper S/N ratio
• No color appears.
• Tape does not run.
• Tape slackens.
• Screen shakes.
• Abnormal sound
• Not ejectable
• The specific mode cannot
be set.
Diameter 1.5 or less
Figure 1
A
Figure 2
Remarks
Rollers
• If abnormal rotation or de-
flection (significant) is
found, replace the roller.
Other than rollers
• Clean the tape contacting
areas. Be sure to use the
specified cleaning agent.
• Replace if failure is found.
• Apply oil.
(Oil : COSMOHYDRO
HV100)
Note:
After oil is applied to the
drive gear shaft, slightly
wipe it off with swab.
• Replace if failure (abnor-
mal sound) is detected.
• If conformance to the
standard is not ensured,
replace part.
Oil