Advertisement
TOSHIBA V 856 B
Mechanical Adjustments
Cont'd
Head cleaner
Screw (2)
\
4
'
|
Cylinder
holding piate {4)
"
Cylinder
Cylinder assembly (6
halding plate (3)
=
Fig. 6-9-1
Note:
* When replacing, take much care not to touch
the video head directly and damage the
cylinder.
7. Perform the tape transport adjustment.
1-6-10. Upper Cylinder Assembly Inspection
and Replacement
<Inspection>
1. Check if the video heads are damaged or
worn out.
2. Check the video heads for clogging. (In case
that the clogging is not remedied after
cleaning.)
<Replacement>
1. Remove the ground brush assembly.
2. Remove two securing screws (1) and remove
the upper cylinder assembly (2).
3. Clean the new upper cylinder assembly (2)
and the flange (3) mounting surface with a
cleaning kit.
4. Align the head A (green) and the marker on
the rotary transformer PC board (4) and then
mount the upper cylinder assembly (Tighten-
ing torque : 294 - 392 mNem. (3 - 4kgecm)
soem)
Screw (3)
i
\
aa
Upper cyhnder
|
assembiy (2)
%
o\
Ground brush
4
Flange (3)
Hass transtormer
PC board (4)
ee
Fig. 6-40-1
Connecter assembly
Fig. 6-10-2
Marker
TS
Ct
Fig. 6-10-3
Note:
* During the work in steps 3 to 4, take care not
to touch the connector assembly and deform
the spring.
5. Perform the tape transport adjustment
according to its procedures.
1-6-11. Lower Cylinder Assembly Inspection
and Replacement
<Inspection>
1. Check if the tape transport surface on the
lower cylinder assembly is not damaged.
2. Check if the rotation of the upper cylinder
assembly is not abnormal.
3. Check if the FPC on the Preamplifier is not
damaged. When any abnormality is found
under the inspection described in the steps
(1) to (3), replace the cylinder assembly.
<Replacement>
1. Remove the cylinder assembly. (Refer to item
"1-6-9. Cylinder Assembly Inspection and
Replacement.)
2. Remove two securing screws (1) and remove
the upper cylinder assembly (2).
3. Replace the lower cylinder assembly (3).
4. Mount the lower cylinder assembly in the
reverse order of removal taking care not to
touch the video head directly and damage the
cylinder.
Note:
* Take care not to deform the joint spring on the
upper cylinder assembly (2).
5. Perform the tape transport adjustment
according to its procedures.
Screws (1)
Upper cylinder
ee assembly (2)
Lower cylinder
assembly (3)
Fig. 6-11-1
4
1-6-12. Cylinder Holding Plate Replacement
1. Remove screws (1) and (2) securing the
cylinder holding plate (3) and a screw (5)
securing the cylinder holding plate (4).
2. Remove the cylinder holding plate (3) and (4)
sliding in the direction shown
by the arrow (B)
and (A).
3. Eliminate the cylinder lock key (wedge
shaped parts).
4, After replacing the cylinder holding plates (3)
and (4), mount new parts in the reverse order
of removal.
Note:
- When remounting, fix the cylinder while
pushing in the direction shown by the arrow
(A) and the cylinder holding plate (3) in the
direction shown by the arrow (B). Then tighten
three screws while pushing the cylinder
holding plate (4) toward the stopper on the
outsert of the mechanical deck.
Tightening order of the screws is (1) > (2) >
(5).
Tightening torque of the screws (1), (2), (5) is
294 - 392 mNem (3 - 4 kg*cm).
Screw (5)
Cylinder holding
plate (3}
\
|_-Serew (1)
Screw (2}
Cylinder halding
plate (4)
'
}
: Va
Cylinder
i
|
ra
Pa
tock key
Fig. 6-12-1
1-6-14. Head Cleaner Replacement
<Roller sub assembly replacement>
4. Remove the roller sub cleaner assembly (2)
pulling upward from the hook (A) on the
cleaner lever (1).
2. After replacing the roller sub assembly, mount
in the reverse order of removal.
<Cleaner lever replacement>
1. Undo the hook (B) of the cleaner lever (1)
from the mechanical deck, and pull out the
cleaner lever (1} upward.
2. Replace the cleaner lever (1) on the roller sub
assembly (2), and mount the cieaner lever (1)
in the reverse order of removal.
Note:
* Take care the roller sub assembly (2) is not
stained with grease or oil.
Stopper rib (C)
_Roiler sub assembly (2}
;
Hook (A)
Cleaner fever (15
4
\e
Mook (B)
Joint portion of
!
elastic spring
oy
Stopper (D}
Assist pin
Note:
+ When remounting the head cleaner, position
the stopper rib (C) in front of the stopper (D).
Cleaner iever {1}
r. Stopper rib (C)
*S
\
S$
D
Fig. 6-14-2
sais
Note:
* Confirm that the joint portion (E) of the elastic
spring positions in front of the assist pin (F)
on the cleaner assist lever (4).
wer
lever {1)
Assist pin (F)
Joint portion (E) of
elastic spring
x
Cleaner assist oes \
lever (4)
Fig. 6-14-3
1-6-15. No. 8, No. 3 Guide Sleeves Replace-
ment
1. When replacing the No. 8 guide sleeve (1),
first remove the guide cap (2) on the loading
bracket assembly.
2. Pull out the guide sleeve (1) from the guide
post (3).
Note:
* Take care not to break the No. 8, No. 3 guide
posts on the mechanical deck if twisting the
guide sleeve forcefully.
3. Insert a new guide sleeve (1) to the guide
post.
Note:
+ When inserting the guide sleeve (1), take care
so that its hole faces the opposite side to the
tape transport surface.
4. For No. 8 guide sleeve, insert the No. 8 guide
cap (2) onto it.
No. & guide cap (2} (In case of No.8 guide cap)
{Loading bracket assembly)
|
Guide sleeve (1)
ey
v4
Pa
f
a |
Guide sleeve (1)
"
"
x
Guide post (3)
Guide post (3)
Fig. 6-15-1
1-6-16. ACE Head Assembly Replacement.
1. Remove the FFC (1) from the connector.
2. Remove two screws (2) and remove the ACE
main base (3) and ACE head assembly (4).
3. Remove three adjusting screws (5), (6), and
(7) and then remove the ACE head assembly
(4).
Note:
* When replacing ACE head (9) only without
replacing its PC board, unsolder the ACE
head (9) on the ACE head PC board (8) and
then remove the ACE head (9) and the ACE
head PC board (8).
4. Mount the ACE head assembly (4) in the
reverse order of removal.
Note:
+ When reassembling the ACE head assembly
(4), First set the ACE springs (10) between
the ACE head assembly (4) and the ACE
main base (3), and secure the adjusting
screws (5), (6), and (7).
Connector
' FFC {1)
' ACE height
es adjusting screw (7}
ACE titt
adjusting screw (5),
ACE azimuth
adjusting screw (6),
ACE head PC board (8)
ACE head assembly (4}
ACE springs (10)
Z
se
main base
Convex portion of ~
|
round a
e's gals)
fixing screw (2)
A,
.
ACEmain base
|
i
ACE main base (3)
fixing screw (2)
Fig. 6-16-1
é
* When securing three adjusting screws, mount
the ACE main base (3) and ACE head
assembly (4) so that the clearance between
them becomes parallel with the specified
preset value (4.3 + 0. 1 mm).
5. After replacing, perform the tape transport
adjustment.
Note:
+ When replacing the ACE head assembly (4),
always use an ACE head (9) having the same
part number. Do not use any other ACE head
assembly.
1-6-17. FE Head Replacement
1. Open the FE head holding hook (1) on the
mechanical deck slightly in both left and right
directions and remove the FE head (2) by
moving in the direction shown by the arrows.
2. Repiace the FE head (2) and mount the parts
in the reverse order of removal.
3. Perform adjustment from the linearity
adjustment item in the tape transport system
adjustment.
Note:
+ When mounting the FE head, Push the head
backward completely.
* Though FE head (2) can be removed upward
by opening the FE head holding hook (1) to
both left and right directions, perform the
standard replacement procedure described
above since this may cause deformation of
the hook.
_/FE head (2)
FE head
holding hook (1}
Ss
Fig. 6-17-1
Puil up after sliding horizontally.
1-6-18. S, T Slider Replacement
1. Remove the tension lever assembly. (Refer to
item. "1-6-23. Tension Lever Assembly
Replacement")
2. Remove the loading slider. (Refer to item "1-
6-25. Loading Slider Replacement".)
3. Remove the S loading assembly. (Refer to
item "1-6-24. S Loading Assembly Replace-
ment")
4. Remove the T loading assembly. (Refer to
item "1-6-24. T Loading Assembly Replace-
ment'.)
5. Remove the S slider (1) and T slider (2) lifting
up to the cutout of the groove on the mechani-
cal deck (3).
6. Remove the S and T guide rollers and mount
a new slider.
7. Mount the parts in the reverse order of
removal.
Note:
Perform the phase alignment between the
loading slider (4) and S, T loading assemblies
(5), (6) referring each replacement procedure.
Loading
Mechanical deck (bottom side) (3)
Slider {4}
$ loading
assembly (5)"
Fig. 6-18-1
Tension lever assembly
8. After completion of the replacement, perform
the adjustment from item | in the tape
transport system adjustment.
1-6-19. S, T Guide Rollers Replacement
The same replacement procedures will be
applied for the S, T guide rollers.
1. Turn the guide roller (1) counterclockwise and
remove the guide rofler (1) from the slider
assembly (2).
2. Mount a new guide roller on the slider
assembly (2) turning clockwise.
3. After completion of the replacement, perform
the adjustment from the linearity adjustment
in the tape transport system adjustment..
Note:
* Oring is not applied to the T guide roller.
* For the T guide roller, marking is located on
the upper flange. So take care not to mis-
mount with the S guide roller.
Mark (T guide roller onty)
io
Guide roller (1)
O ring
y {S—guide roller only}
/ Slider assembly (2)
Fig.
Advertisement
