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TOSHIBA V 856 B
Mechanical Adjustments
Cont'd
1-6-20. S, T Impedance Roller Replacement
1. Remove
two screws
(1) and (2). and then
remove two brackets (3), (4).
2. Replace two impedance rollers (5), (6).
3. Mount the parts in the reverse order of
removal.
4. After completion of the replacement, perform
the adjustment from the linearity adjustment
in the tape transport system adjustment.
Note:
* S, T impedance rollers (5), (6) is not always
applied to all models.
eo
(1)
go
(3)
i
Bracket (4)
S Impedance
roller (5)
T Impedance
rolter (6)
;
Fig. 6-20-1
1-6-21. Pinch Roller Assembly Replacement
1. Remove the loading drive assembly (Refer to
item "1-6-29. Loading Drive Assembly
Replacement".}
2. Remove the pinch assembly (1) lifting
vertically from the pinch post (2).
3. Remove the pinch spring (5) from the hooks
on the pinch drive assembly (3) and the pinch
lever assembly (4).
4. Turn the projection (A) on the pinch drive
assembly (3) counterclockwise till it goes to
the cutout on the pinch lever assembly (4).
5. After replacing, mount the parts in the reverse
order of removal.
6. After completion of the replacement, perform
the tape transport adjustment.
Loading dnve assembly
Pinch assembly (1)
Pinch drive
"s,
" Projection (A)
Apply grease
here.
Phase alighning !
i
hote (C) t
(
NS
Inside-" "tis
'
Pinch lever
groove (E}
assambly (4}
iY
Cam gear
_—— Phase aligning
post
hole (8)
"aR,
™
Pinch past (2)
~.
,
I
Fig. 6-21-1
"s Apply grease here.
hare
NE
ge
Note:
* For the removal and assembling of the loading
drive assembly, refer to item 1-6-29.
* When inserting the pinch assembly (1) into the
pinch post (2), insert it so that the pinch drive
post (D) enters the groove (&) inside the cam
gear.
* Take care not to touch the surface of the pinch
roller and the grease is not stained on it.
* Be sure to apply grease to the surface of the
bar-ring on the pinch fever assembly (4) and
the pinch post (2) on the mechanical deck.
1-6-22. No. 9 Guide Lever Assembly Replace-
ment
1. Remove the loading drive assembly. (Refer to
item "1-6-29. Loading Drive Assembly
Replacement".}
2. Remove the drive lever. (Refer to item "1-6-
40. Drive Lever Replacement".)
3. Remove the pinch assembly. (Refer to item
"{-6-21. Pinch Roller Assembly Replace-
ment".)
4. Remove the ACE head assembly. (Refer to
item "1-6-16. ACE Head Assembly Replace-
ment".)
5. Remove the cam gear (2) from the cam gear
post (1).
6. Remove the T soft brake spring (3).
7. Remove the No, 9 guide lever assembly (4)
lifting the No. 9 guide lever assembly upward
from the No. 9 guide post (5).
8. After replacing, mount the parts in the reverse
order of removai.
9. After completion of the replacement, perform
the tape transport adjustment.
Note:
« When mounting the No. 9 guide lever
assembly (4), confirm that (A) side of the No.
9 guide lever assembly (4} touches the
capstan motor housing portion.
* After inserting the No. 9 guide lever assembly
(4) into the No. 9 guide post (5). confirm that
the lower projection of the No. 9 guide lever
assembly (4) touches to the upper surface of
the mechanical deck.
* Take care that the grease is not stained on the
No. 9 guide post of the No. 9 guide lever
assembly (4).
* Be sure to apply grease to the No. 9 guide
post (5).
Crive iever
Cam gear {2)
(A) side of No. 9
guide lever
| No.
9 guide lever
\ assembly (4)
No. 9 guide
post
\!
assembly
Lower side projection 7
3
ot No. 9 guide lever?
ao ae
pa ie
T soft brake spring (ay
™__- Drive lever
post
No. 9 guide post (5)
Apply grease here "
T soft brake lever
assembly
c
Capstan motor housing
Fig. 6-22-1
1-6-23. Tension Lever Assembly, Band Holder
and Band Brake Repiacement
1. Remove the tension spring (1).
Note:
* Take care not to extend or deform the tension
spring.
2. After setting the band brake adjuster to the
band
holder assembling
position, undo the
claw of the snap-fit type and remove the band
holder from the band brake adjuster by lifting
it upward.
Adjuster
"(@
Band holder assembly position
Fig. 6-23-1
Detail of band hoider assembling
3. Undo the claw of the outsert on the mechani-
cal deck catching the shaft of the tension lever
assembly (3) and remove the tension lever
assembly lifting it upward.
4. Remove the band brake (5) from the reel
table while pulling the S soft brake lever (4) in
the direction shown by the arrow.
5. Remove the band brake (5) from the hook on
the tension lever assembly (3).
Note:
* Take care not to contaminate, bend or damage
the felt surface on the band brake (5).
6. After replacing the tension lever assembly (3),
clean the shaft on the tension lever and apply
a small amount of oil.
7. Mount the parts in the reverse order of the
removal.
8. After mounting, check the tension post
position and perform the adjustment and back
tension check.
9. After completion of the replacement, perform
the adjustment from the linearity adjustment in
the tape transport system adjustment.
Note:
* The band holder (2) can be replaced in the
procedures described above steps 1 to 3.
* The band brake (5) can be replaced in the
procedures described above steps 1 to 5.
* When replacing the band holder (2) and band
brake (5), the linearity adjustment is not
necessary.
Tension lever assembly (3)
Band holder (2)
Removal of
-- Shaft (Apply oil.)
snap-fit claw
Band brake (5)
Removal of
outsert claw
™* Band brake
adjuster
Tension ye
spring {1}
Ree! table
ae
:
S soft brake
Fig. 6-23-2
lever (4}
1-6-24.
$,T Loading Assembly Replacement
1. Remove the mechanical deck assembly from
the main PC board.
2. Set the mechanical! position to the F/L out
position (front side). Turn over the mechanical
deck.
3. Remove the loading slider assembly. (Refer to
item "1-6-25. Loading Slider Assembly
Replacement".)
T slidar assembly (4)
T igading hale (B)
(F/L out position)
White
S foading hole (A}
\
T loading
assembly (2)
5 loading
S slider assembly (3)
assembly {1}
{FAL out position)
Fig. 6-24-1
4. Remove the S, T loading assemblies (1), (2).
5. insert the S, T slider assemblies (3), (4) along
the cutout of the S, T loading holes (A) and
(B) on the mechanical deck and set the S, T
slider assemblies (3), (4) to the loading
position (rear side).
6. Insert the T loading assembly (2) to the post
{C) on the T slider assembly (4) and the post
(D) on the mechanical deck. And insert the S
loading assembly (1) to the post (E) on the S
slider assembly (3) and the post (F) on the
mechanical deck.
T loading assembly {2}
Post (C}
T slider assembly (4)
{Loading position}
Post (F}
lm
* Align the phases of the s marks on the S, T
loading gear (1), (2).
S slider assembly (3)
(Loading position)
S ioading hole (A)
Fig. 6-24-2
7. Set the S, T slider assemblies (3), (4) to the F/
L out position.
T loading
gear (2)
Fig. 6-24-3
1-6-25. Loading Slider Assembly Replace-
ment
wh
. Remove the mechanical deck from the main
PC board.
2. Set the mechanical position ta the F/L out
position.
3. Turn over the mechanical deck.
4. Remove the stop ring (1).
5. Remove the loading slider assembly (2) while
lifting its tip upward using the mold portion on
the loading slider assembly (2) as a fulcrum.
6. Mount the parts in the reverse order of
removal.
Note:
« When mounting the loading slider assembly
(2), insert the tip of the loading slider assem-
bly (2) slightly to the mold portion, then mount
it so that the claw on the outsert is in the
position of the cutout portion of the loading
slider assembly.
* Confirm that the position mark on the loading
slider assembly (2) and the mark on the T
loading gear match each other in position.
Mald portion
Loading slider assembly (2)
motor
Stop ring (1)
Mechanism deck bottom side
Fig. 6-25-1
View from Mechanical deck bottom side
T joading gear
Marking
Mark
igs
1-6-26. Hook Lever Assembly Replacement
Loading slider assembly {2)
Fig. 6-25-2
1. Remove the top bracket. (Refer to item "1-6-
1. Top Bracket Repiacement".)
2. Remove the cassette holder assembly. (Refer
to item "1-6-2. Cassette Holder Replace-
ment".)
3. Remove the drive arm assembly. (Refer to
item "1-6-5. Drive Arm Assembly Replace-
ment")
4. Remove the tension spring (1).
5. Turn the hook lever assembly (2)
counterclockwise slightly, and remove the
claw on the hook fever assembly (2) then
replace.
6. After replacing the hook lever assembly (2) ,
insert the (A) portion of the hook lever under
the S reel table assembly. When the portions
(B), (C), (DB) are in line, push the claw into the
mechanical deck.
Claw
(a)
ee :
S reel table
ih
=
Hook fever
assembly (2)
Cam slider
Fig. 6-26-1
7. Turn the hook lever assembly (2) clockwise till
it stops, and mount the tension spring (1).
After replacing the hook lever assembly (2),
slide the cam slider in the direction shown by
the arrow, and then position the boss (E)
under the cam slider.
Tension
Hook lever (2)
spring (1)
sy)
zs)
S reel table
assembly
Cam oe
Fig. 6-26-2
1-6-27. Hook Replacement
1. Remove the hook lever assembly. (Refer to
item "1-6-26. Hook Lever Assembly Replace-
ment'.)
2. Turn over the hook lever assembly (1) and
remove the hook lever assembly (1) opening
the portion (A) of the hook (2) slightly and
lifting the hook (2) upward.
3. When mounting a new hook, push the hook
(2) in the portion (B) from above.
Note:
* Take care not to confuse the mounting
direction of the hook (2).
Portion (B)
Hook lever
assembly (1}
Fig. 6-27-1
1-6-28. Tension Drive Lever Replacement
1. Remove the cam slider. (Refer to item "1-6-
41, Cam Slider Replacement'.)
2. Turn over the mechanical deck and remove
the tension drive lever (1) from the projection
(A) moving counterclockwise slightly.
3. After replacing the tension drive lever (1),
mount in the reverse order of removal.
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