JVC MF-47L - Check Point after Replacement of Rotation Parts; Head Replacement and Adjustment

——e
Motor
Flywheel
Pinch Roller Arm Ass’y
Take up Reel (Right)
Supply Reel (Left)
. Remove a capstan belt.
. Remove a capstan belt.
ass’y.
supply reel.
2. Take out a reel from the
. Disconnect plug from P.C. Board.
. Remove the motor. (screw 3 pcs)
. Take out a flywheel holder. (screw 3 pes)
. Pull out the flywheel (shaft 1pc)
Remove an E ring fixing a pinch-roller arm
(E ring 1 pc)
1. Take out an E ring fixing take-up and
(Er
shaft.
MF-47L/ML
Be careful not to soil in
belt.
@ Fig. 11
@
Fig. 10
©
ing 1 pc)
Note:
Check Point After
Replacement of
Rotation Parts
1. Pinch Roller Pressure
@ ft must be within 400 ~ 550 g/cm
@ The roller continues to rotate after being rotated by
the finger.
® The roller surface contacting the capstan must be
vertical.
2. Flywheel
@ A little thrust clearance exists between flywheel shaft
bearing and spacial washer.
® The capstan is clean, correctly centered, and provides
quiet rotation.
3. Play torque
It must be within 40 ~ 70 g/cm
If the torque is out of the specified range, the following
action is necessory.
1 Wipe the takeup disc periphery and all the parts with
which the disc comes in contact, by use of a cloth
moistened in alcohol.
2. Nevertheless normal condition is
replace the takeup disc or takeup lever spring.
not obtained,
1. Don’t dirty with oi! or extend excessively the belts to prevent the increase of wow and flatter.
2. Adjust the height of the Motor Pulley, when replacing the Fiywheel-drivebelt, so that the belt will be
parallel to the chassis surface.
Head Replacement and
Adjustment
If either of the Recording/PB head and the Erase head
shows low performance caused by wear, broken wire or
excessive magnetization, it should be replaced. They can be
removed by loosening screws with following procedure.
Replacing the Head
Step
1. Push the EJECT button to open cassette cover.
2. Unhook the brake arm of air damper at left of the
cassette cover.
3. Pushing the both lower sides of cassette cover, pull out
the cover upwards.
4. Erasing Head
(Remove 2 screws () & ©) ) (Fig. 10)
5. Play/Rec Head
(Remove 2 screws @) & @) ) (Fig. 10)
After replacement, adjust the azimuth of head.
Azimuth Adjustment
Preparation
Regarding Azimuth Adjustment only, unscrew 2 screws ®,
in Fig. 12 to remove cover plate, and push PLAY/REC
button, so that the heads part will be shifted upwards and
the adjustment can be made with a screwdriver from upper
side of the operation buttons.
Step
1. Connect the INPUT jack of V.T.V.M. to the LINE OUT
of REC/PB socket.
2. Play back the standard tape (Full Track or JVC Test
Tape VTT658 10kHz) for azimuth (angle adjustment}.
No. 7011