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VL-E780U
VL-E785U
VL-E785T
5. MECHANISM ADJUSTMENT
5-2. Items and timings of inspection and maintenance
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:
Grease: MORYCOAT YM-103/X5-6020
Screw locking agent: THERE BOND 1401B
Cleaning liquid: Industrial-use ethyl alcohol
5-4. ADJUSTMENT OF MECHANISM TAPE TRAVEL SYSTEM
5-4-3. Adjusting the Si roller height
(2) Adjusting the Si roller
1 Playback the tape such as to set the V/SR mode.
6. ADJUSTMENT OF VCR
6-1. ADJUSTMENT OF VCR SECTION
6-1-5. Y/C circuit adjustment method
2. Adjustment of input Y level
Measuring instrument
Mode
Input signal
Measuring point
Adjustment address 32
Adjustment level
Usage time (hrs.)
500
1,000 1,500 2,000 3,000
∆
∆
Oscilloscope
VCR STOP
Color bar
TL801
500 Vp-p ± 20 mVp-p
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 can-
not be set.
: Replace.
∆ : Apply oil.
: Clean.
500±20mVp-p
4
Remarks
Rollers
• If abnormal rotation or
deflection (significant) is
found, replace the roller.
Other than rollers
• Clean the tape contact-
ing areas. Be sure to
use the specified clean-
ing agent.
• Replace if failure is
found.
• Apply oil.
(Oil:
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.
: Check.
)
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