Sharp VL-MC500U Service Manual download pdf (Page 11)

VL-MC500U/K

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

• Replace if there is anything abnormal in the rotation, or if there is run-out

(that becomes large).

• 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

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 115 116

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Sharp VL-MC500U Service Manual Page 11

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