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TOSHIBA V 856 B
eT
eclmUelaiirelicels
000tC
o014c
0250
0350
0400
RN441
RSO45
RTO089
RWO12
RWO021
RWO30
0060M
LP0O2
LPoz0
CPO0t
CP002
CP003
RPO18
RP021
RPO41
RPOS8
RP074
RPOS4
RPOS2
RP100
BPOOt
FPOO1
(V-856B Only)
oo01c
0014C
0250
0350
0400
RPOS2
0001C
0014C
0250
RPO92
1-1. Mechanical Parts Location
Top View
V3 Mechanism - Also Covers V 857B
Recommended Safety Parts
Part No.
7006 1667
70012604
70051879
76051766
70824403
70041571
70641671
70049122
70041074
76040122
70041116
70051878
70011949
76012519
70042150
70041888
70051555
70042048
7004 1673
70042246
70042046
70041073
70042248
70041116
70041946
70031176
70010445
70061667
70042504
70051879
70051756
70824403
70041146
70061929
70012731
70051996
70040125
Description
Owners
Manual
English
Power Cord
Front Panel
Bottom
Plate
Top Cover
Res. Fusibie
1892
10,
Res. Fusitle
1892
J0.
Res, Carbon
10
J 06.
Res, Fusible
270)
J0.
Res, Carbon
1Q
50.
Res, Fusible
3902
J9.
Back Panel
Line Filter
Power Transformer
SRN2924ED
Cap, Plastic
100nF
M
Cap Electrolytic
100uF
M 385V
Cap
2.2nF
400V
Res, Metal
0.820
KO. 4W
Bes, Fusibte
2.2kQ
J0.3W
Res, Fusible
0, 220
Res, Chip
1002)
J0. IW
Res, Fusibla
220
J0.3W
Res
1. 542
Res. Fusibie
39)
J 0. 3W
Res
68002
420V
Inlet
Fuse, tA, 250V
Owners
Mnual
English
1
Power
Cord
Front Panel
Bottom
Plate
Top Cover
Res, Fusible 39Q J 0. 3W
Owners Manual! Engiish
Power Cord
Front Panel
Res, Carbon 479 J 0. 3W
Adjustment Procedures
1. Mechanical Adjustment
Head cleaner
Ground brush
Top bracket
assembly
assembly
Cassette holder
Loading drive
1-2. Servicing Jig List
Alignment tape
70909409 (ST-C6)
70909410 (ST-C7)
Back tension
cassette gauge
1-4. V3 Mechanism Check Method
if the abnormal condition is caused by the
mechanism itself, analyze the cause according
to the following procedures.
1-4-1. External Appearance
check
VTR cleaning kit
VTR lubrication kit
Grease
Note: Conventional alignment tapes ST-C1
(70909227) and ST-C3 (70909264) can be used
partially.
1-
*
3. Main Parts Servicing Time
Part replacement time differs from servicing
life time of each part.
Following table is prepared based on a
standard condition (room temperature, room
humidity). The replacement time will be varied
depending upon operation environment, using
methods, operation duty, etc.
Particularly, life of the upper cylinder depends
upon operation conditions.
Fig. 4-1-1
Service time (Operating Hours)
500 | 1000} 1500) 2000 | 2500 000! 3500]
-—+
-
Part Name
Tension post
When
cleaning,
use
a swab
or
piece
of
gauze
soaked
in
Impedance rolter *
alcohol.
S/T stant guxde post
After cleaning, cleaned parts are
dried comepletely, and then load
a video cassette.
» When lubricating, always use the
specified oit,
Tape
Transpon
System
When
the lubricating,
apply one
or
two
drops
of on
alter
the
cleaning with alcohol.
FE head
ACE head
Pinch roller
|
Capstan motor
Loading motor
olalolololojojo:
Loading belt'
Reel belt
Tape
Drive
System
Oo
| 0 | + Check the back tension.
0
Oo |
Shae Se
& : Cleaning
©; Check and replace if necessary
« There are two types. One type has an impedance rollet and another type has no impedance roller.
Bottom View
Cam gear
T slider
ACE head
Cylinder assembly
FE head
Upper cylinder
Pinch assembly
Lower cylinder
T sott brake
Tension lever
assemitiy
8and brake
S reef iabie
3S sott brake
assembly
t reei table
idle gear
Hoider centenng
post assembly
REC
inhibiting
lever
Drive arm
Door open fever
Cam
sider
Capstan motor
Ree! belt
idle gear
S loading assembly
T loading assembly
Tension drive lever
S main brake
Center gear pulley
1-4-2. Motor Sensor System check
Check whether some abnormalities are found in
the motor or the sensor system (including
control circuits) according to the flow chart.
Does ihe loading moter
NO
rolale withoud a casselle afer
turning the power ON?
Loading motor
abnormality.
YES
NO
Cam SW: phase shift
or
_Cam SW abnofmality
Does the cam gear ange
is made at standby position?
{Refer to Fig.4-1-t}
YES
Tape sensor abnor-
mality when toading the
cassetie holder.or
_ Cassette holder loading
ay
Afier releasing
the lock lever, EJECT ope-
ration is performed soon after
pushing the cassetle
halder?
NO
YES
NO
-—
Capstan motor
adnormaldy
Does the capstan rotate
during tne above operation ?
YES
During the
above operation,does
the T rael table rotate when
the cassette holder goes down and
does the 5 reel labie rotate
when the cassette
holder goes up?
i)
Capstan belt ard
Reel system
abnormality
YES
'Reel sensor sysiem is
"abnormal when the
_ Cassette 1§ ejected with-
"out rewinding tape or
stopped in the way of
_unMioading operation.
When inserting the
cassette with a safery tab,
is the cassette stopped at the
Playback postion afier
detectingthe tape
femain.?
NO
YES
Sensors are normal.
1-4-3. Abnormality Analysis by Self-check
Function
The unit used V3 mechanism has a self-check
function.
The self-check function works as a system
which stored some abnormal condition. So, use
this function to try to analyze the cause(s).
For the data display method and the content of
the data, refer to the self-check function in item
2-3.
Abnormal Condition
Note:
+ Abnormal! data is displayed only when the first
abnormal condition occurs, and is not
displayed in the second time. Accordingly, the
claim from customers and the actual data
displayed may be different.
+ The data is stored only when the power turns
off after occurring the abnormality
condition(s). The data is not stored when the
unit operation is recovered by the microcom-
puter.
- After repairing, initialize the data by pressing
the [COUNTER RESET] button while
displaying the abnormal mode.
The typical examples in abnormal condition
are shown (See Table 4-3-1).
1-4-4. Check by Defective Analyzing List
If the abnormality causes the mechanism
abnormal! condition, presume, confirm and treat
the defective according to the "Defective
analyzing list" in Table 4-4-1.
4) Manual mechanism operation (mode shift)
method
Push in the lock lever R and L manually and turn
the worm wheel counterclockwise as shown in
Fig. 4-1-1. The cam gear is turned clockwise
and the mode shifts to the direction where the
loading operation can be performed. So, check
the mechanism condition in the defective
mechanism position when the abnoimality
occurs.
2) Defective parts replacement
When a defective occurs due to the defective
part(s) and the part(s) is replaced, take care the
following items.
* Especially as for the mechanical parts
requiring the phase alignment, take care of the
part replacement E.g.. Assembling mode, phase
alignment mark and etc.
- As for the part(s) requiring lubricant such as a
specified amount of oil or grease, apply grease
or oil according to the instructions and do not
stick grease or oil to the portions without
allowing to stick it (especially in removal and
assembly).
3) Check after treating the defective
After replacing a defective part andlor aligning a
part, first check the mechanism operation
manually and confirm that no problem occurs,
and then mount the mechanical (leek, turn the
power ON and check the mechanism operation.
Note:
- After replacing the defective parts according
to the procedure of the treatment method for
the damage and phase shift of mechanical
part", check the operation of the mechanism
again, since the same (or similar) defective
problem may occur due to other serious
cause (in mechanism or electrical circuit)
when performing the actual tota! check with
turning the power on.
Continues Next Page...
Check ttem
c3
playback the tape.
a,
the lape.
playback the tape.
wv
td
REVIEW
the tape.
rm
u
n
wt
a
Ww
ia
u
ca co of
REVIEW.
Table 4-3-1
Cytinder is stopped al playback pasition during
Cytinder is stapped al FF/REW
position during rewind
S reel sensor is abnormal
at playback position during
Check the cylinder motor,
Check
the cylinder and tape
transport guide
are clogged.
T reel sensor is abnormal at playback postion during
Check the capstan motor.
Reter to the cases 2 and 3 describe on the table
"Defective analyzing list".
Cassette-in and out operation cannot be performed.
Mode shit cannot be performed during shifting to
Refer to the case 1 described on the table
"Defective analyzing list'.
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