Sony B Mechanizm User manual

Video8
BMECHANISM
OPERATION MANUAL
l_!MECHANISMDECK

CONTENTS
1. Main parts layout diagram ....................................................................... 4
2. Operation of main parts ............................................................................ 5
3. Operation of each part .............................................................................. 6
3-1. Driving of LS chassis ......................................................................................... 6
3-2. Driving of pinch roller ....................................................................................... 8
3-3. Driving of tension regulator and TG1 ............................................................ 10
3-4. Driving of S reel and S ratchet ....................................................................... 12
3-5. Driving of T ratchet and T soft gear .............................................................. 14
4. Operation in each mode ........................................................................... 17
4-1. Cassette IN _ STOP ............................................................................. 17
4-2. STOP _ PB ............................................................................................ 23
4-3. STOP _ REC ......................................................................................... 27
4-4. STOP _ FF ............................................................................................ 31
4-5. STOP =:===:_ REWIND ................................................................................ 35
4-6. PB =====_ CUE ............................... ............................................................... 38
4-7. PB _ REVIEW. ........................................ _............................................ 40
4-8. PB _ PAUSE ......................................................................................... 42
4-9. STOP _ EJECT .................................................................................... 45
-3-

1. Main parts layout diagram
REC proof switch (S001)
Sensor
Cassette down switch
(soo2) T reel
LED
S reel
Capstan moto
(M902)
Pinch roller
Drum (M901)
Sensor S
gear
Loading motor
(M903) Rotary encoder
(sg01)
Fig. 1-1
-4-

2. Operation of main parts
f
Tension regulator plate 1
moves in the direction of
arrow.
I Loading motor (M903) rotates. I
IWorm_ha_and,o__ro_os.I
] Rotary encoder rotates. I
M slider slides in the direction of I
arrow ° I
I Pinch press plate moves:in the I'
direction of arrow.
f
IGL arm moves in the
direction of arrow.
IGL slider moves in the
direction of arrow.
I
!
Loading motor
(M903)
Rotary encoder
Tension regulator
plate .1 _
GL slider
Pinch press plate
GL arm
Cam gear
LS arm
Fig. 2-1
M slider
-5-

3. Operation of each part
3-1. Driving of LS chassis
[LS arm moves. 1
LS chassis moves. J
ICam gear rotates.
1
Mslider moves in _)
direction after first
slightly moving in (_
direction.
Pinch press plate moves
in_)direction after first
slightly moving in(_)
direction.
I
I TG4 moves in the ]
direction of arrow.
!
TG 1moves in the -I
direction of arrow. ]
i
V
Claws on stoppers S and T
arereleased from locked
position and guide S 0°02)
and guide T 00G3) move in
the direction of arrow. r
Pinch roller moves in the [
direction of arrow.
4
r
GL ann moves in the [
direction of arrow.
I
GL slider moves in the
direction of arrow.
II
Guide S (TG2) and guide
T (TG3) further move in
the direction of arrow.
-6-

GL slider _)
GL arm__ _oo_._ _ @r_,_
"___ "" Pinch press plate
Cam gear_-iS _ __
Fig. 3-1
TG1
Guide T
(TG3)
Guide S
(TG2)
_(_uide rail
Pinchroller
arm
Stopper T
iViewed from the rear. I
Fig. 3-2 LS chassis assembly
-'7-

3-2. Driving of pinch roller
I
I
M slider moves in the
direction of arrow.
Pinch press plate moves in
the direction of arrow
Shaft of pinch roller arm is
pushed with pinch press
plate at(_portion.
Pinch roller moves in the
direction of arrow to be
pressed with capstan shaft.
I
-8-

press plate
M slider
Fig. 3-3
Pinch roller_...._
Shaft of pinch -Torsion spring(pinch)
_Pinch press plate

3-3. Driving of tension regulator and TG1
Rotary encoder rotates. [
1
I TG1 moves in the direction of J
|
arrow(_as LS chassis moves. I
1
TG1 shaft touches on(_laortion. [
then it moves in the direction of I
arrow_. ]
9
!
TG1 further moves in the
dire_on of arrow_.
4
p
i
TG1 moves in(_)direction
shortly after it moves in_)
direction. I"
TG1 moves in(_iirection. 1
!
Tension regulator plates 2I
and 1 move in_:lirection, n
|
!
Rotary enc_ler further
rotates and tension
regulator plates 2 and 1
move inOdirection shortly
after they move ini_)
dim_ion.
p
Tension regulator plates 2
and 1 move in, direction.
I
- 10-

Tension regulator
plate 2
Tension regulator/
plate 1
_'- _ _Rotaryencoder
(S901)
der
Fig. 3-5
® ®
TG1
TG1 moves inthe directionof
arrow(_as LS chassis moves.
Tension regulatorband
regulator
plate 2
"Tensionregulator
plate I

3-4. Driving of S reel and S ratchet
M slider moves in the direction of arrow I
i
as cam gear rotates. I
S ratchet shaft touches M slider on®
portion, then S ratchet moves in the
direction of arrow(_).
S ratchetreleaseplatemoves inthe
directionof arrow_. I
* With this operation of S reel
the brake is released.
- 12-

S!
S ratchet shaft
©
LSarm
S me|
S ratchetretease plate
S
S ratchet -i'enslonspring
M slider

3-5. Driving of T ratchet and T soft gear
M slider moves in the direction of
arrowl_ in no time followed by
movement in the reverse direction.
+
T soft claw and T soft spring
move in the direction of arrowO,
then, immediately returned.
!
1
Mslider pushes Tratchet on®
portion and Tratchet moves in
the direction of arrow_, then,
immediately returned.
1
I M slider again moves in the direction of arrow@, i
IT soft claw and Tsoft spring "Tratchet moves in the direction i
move in the direction of arrow_). [ [ of arrow (_)to brake T reel. I
*Under this condition T reel is
locked, allowing no rotation.
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T soft claw
©
Tsoft gear
T soft spring
Fig. 3-9
Tratchet
slider
Tension spring
T reel
Tsoft
soft spring
softgear
Mslider

IMemol
............................................................. • ...... o........... o°o° ..................................................................
..................................... .......... ,................................. • .............. °°.°o° ................................................
....... _ ..... o°°°o .................... ° ........ .o.0.ooo .......... °..°,°,o°_,.°o°° ................................................................ ÷°o°.
............................................................................ o. .... °ooo ............................................. . ..................
....................................................................... _.......................................................... o......... _.........
...................................... °ooo.°.oo,o...°_ooo,,oo°..°°.o_ .... o........... °o.°oooo°,o°o ...... o°,o°°o ............. .°oooo°.°_o ...... _o.o..°o°
..................... •...... • ............... °°.,° ............................... •.....................................................................
-]6-

4. Operation in each mode
4-1. Cassette IN ====_ STOP
f
•I LS arm moves in the direction of arrow. I
m|
arrow (_) in conjunction with the
movement of LS arm boss.
Stoppers S and T on guide S (TG2) and [
guide T (TG3), respectively, are released, [
thereby GL slider movesin the direction
of arrow, allowing guide S (TG2) and [
guide T (TG3) to move in the direction of [
arrow to be set in place. ]
I Loading motor (M903) rotates. [
t
Rotary encoder and cam gear I
rotate via gear A. I
;
I I
Mslider moves firstly in _) direction,
subsequently in (_) direction.
f
TGI and TG4 move in the direction of
arrow as LS chassis slides.
This operation the tape contacts
closely with drum (M901).1
S ratchet moves in the
directionof arrow 0, then
returned.
I
Pinch miler moves in the direction
of arrow (D. ,l I
TG1 is slightly returned in ]the direction of arrow ®.
IM slider further moves in the direction [
of arrow (_ followed by the movement I
1
Pinch miler moves in the direction of I
arrow@tocontactwithcapstanshaft.I
Tratchet moves in the direction of arrow (_, {
braking T reel followed by immediate releasing. [
IPinch miler rotatesin the direction of ]
I
arrow 0), then in the _versc direction. I
f
Loading motor (M903) rotates I
reversely. I
I Pinch roller moves in the direction
opposite to arrow _, separating from
capstan shaft.
[Loading motor (M903) stops. ]
-17-

Drum (M901) rotates. ]
moves in the direction of arrow (1_, [
7reel followed by immediatereleasing. I
i
IDrum (M901) stops.
[Capstanmotor (M902) retains. I
through timing belt.
l ,I
[Gooseneckgearmoves in the direction
]ofarrow® to gearintoSreel. ]
[Capstan motor (M902) stops. ]
T reel slightly rotates in the
direction of arrow.
r
Capstanmotor(M902)rotates in the reverse _ Sreel slighdy rotates in
direCnomadal°nmantadc'n.nnmediatdyreturns t° the F--'_ the directi°n °f art°w" I
IGooseneck gear moves in the direction L_.__ T reel slightly rotates in [
of arrow (_ to gear into Treel. ]-[the direction of arrow.
* This operation the
looseness in tape is
corrected.
I I Capstan motor (M902) stops. I
-18-

Cassette compartment
Cassette down
switch(S002)
* When cassette compartment is
depressed in the directionof arrowO,
claw on(_)portionin cassette
compartment touches EJ arm at(_
portionso that EJ arm moves in the
directionof arrow(_).This operation is
locked cassette compartment and
,turns ON cassette down switch
(S002). When tumed ON the cassette
down switch (S002), drum (M901) and
capstan motor (M902) startto rotate.
!
EJ arm
+Fig. 4-1 Cassette compartment DOWN
-]9-

Loading motor
(M903) Drum (M901)
HC roller GL slider
Capstan motor (M902)
Gear
Rotary €
Tension regulator
plate I
Tension regulator
plate 2
Cam
plate
belt
press
LS arm Change gear
Mslider Relay gear
Fig. 4-2 Mechanism chassis assembly
TG1
Guide S Guide T
(TG
LED
Pinchroller
TG4
Tension regulator
band
RVS
S ratchet release
plate
S
down
switch (S002)
reel
ratchet
proof
switch (S001)
S reel T softclaw T soft spring
Gooseneck gear T soft gear
Fig. 4-3 LS chassis assembly
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