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TOSHIBA V 856 B
12
Rewind
2-2-1. Bias Level Adjustment
Renew
FF
Line cable
Line cable
Test point: Pins 1 and 2 of BS001
Cue
3) Operation check procedure
[3DNR] on after checking whole murky noises
on the color bar. Be sure that whole noises are
reduced in this status.
1. Set the VTR to record mode.
2. Connect pin 2 to the millivoltmeter and pin 1
to ground.
3. Adjust PS034 to obtain 2.6 + 0.1 mV (rms).
Unloading stop
Reverse playback
Still in reverse playback,
Reverse slow playback
2-4-2. Troubleshooting flow chart
Recording
Check the Main PC Board
.
.
b
Pin 10 of HROO!
-
Pin 14 of HROO1
Assy (0005M) and 3DNR
2-3.
Self Diagnosis
Function
Record pause
Proced ure
1 z
OK?
( Check color signal wavetorm. )
OK?
( Check sine wave signal. )
PC Board Assy (0094M)
Power off eject
Eject
Short FF
Short REW
First, check the power supply voltage and the
2-3-1. Outline
installation state of the 3DNR module.
When a tape running stops or the VTR enters
the power OFF mode, etc. due to some
abnormality, the abnormality is stored in the
EEPROM and displayed on the display tube.
Procedure 2.
Classify the defective symptoms into groups.
Se acepeaae
Check the Main PC Board
Abnormal mechanism positions
Check the screen on playback according to the
OK?
poe LO and SONA
Sicaake oh taitia
:
CONScK sine wave signal)
PC Board Assy (094M)
OK?
Check: the
oul
ted
operation check procedure 2-4-1.
nek nada
in almost same intervals. )
F/L out
2-3-2. Storing abnormal modes
F/L down
Procedure 3.
Sao
;
Loading/untoading
Check the defects according to the flow chart.
* The abnormality is classed into 5 groups, and
Reverse rotation with pinch roller ON
the abnormality number, system control _
Playback with pinch roller ON
No.
Defective symptoms
Flow chart
Pin and 4 of HROOY
al
Pen
mode, and the mechanism position at which
Stop with main brake ON
(1)
No display appears when playing-
A
sails
in almost same intervals. )
OK?
( Check Video signal waveform. )
the abnormality occurred are stored in the
FFE/REW
back, or lange turbulence and noises
EEPROM P a
t h
c a e
:
Position detection impossible
occur.
* The writing timing is just after the abnormality
(2). - 'Noicolet aobears wheerplayngbatk.
"7s
occurred.
Positions 0, 2, 4 exist as mechanism positions.
or color noises appear a lot.
:
:
For example, 8 shows a position between 7 and
Pin 8 of HROO1
Defective 3DNR Module
2-3-3. Abnormality mode display
9 (between playback position and review
OK?
( Check Video signal waveform. )
ERROR
* Press the CH UP and CH DOWN buttons on
positon):
the VTR simultaneously for more than Ss.
¢ And then within 2s, press the STILL button on
the remote control.
:
;
/
1) Outline
Defective 30NR Modul
S a PO Sy eet CONUCT Ue Al wee
All the time for which the cylinder is ON is
abnormality occurred is displayed at the
counted,
memorized on EEPROM,
and indi-
channel display area, "E" is displayed at the
:
;
hour digit, abnormality generation number is
Estado the clepley ube:
displayed at the minute digit, and the
2)
mechanism position is displayed in the
.
2-3-4. Cylinder rotation time display
Display method
ee
a
Press the "CH UP" and "CH DOWN" button on
gss
<Joln
833
8s3
second digit position,
=
the main unit for more 5 sec. at the same
3DN R
S25
lied
gs*
Bs=
* The abnormality mode is displayed regardless
time.
z 2
Bl
fe
<e
<83
{8
of the power on off.
+ Next, within 2 sec. press the "STOP" button
Diag ram
ss:
:
8
S32
on the remote control.
*
1%
* The cumulative operation time of the cylinder
S
will be displayed for 30 sec. The time unit is
tO
an hour.
8
a
Ly
ee
Sees)
:
8
<=
A
4
3) Example of display
ae
eis
Ab
I
syst
Abnormali
ti
$8
fepualinace
rae my Generaiee
* In case of 1234 hours.
33
Z
Abnormal
"3
A
mechanism positions
« When the Counter Reset button is pressed in
the display period, the abnormality display
data is initialized and "-" is displayed.
» ii Case or 4 Hours
200uL
i10MNY
The data displayed is as follows:
WNOIS
AVId
vlONY
FAQEZZISZ
ec
Abnormality generation number
v
2
>
<
an
Q
z
>
| eee
Cylinder stop
Reel abnormality (take up)
2-4. 3DNR Module Troubleshooting Flow
Reel abnormality (supply)
Chart
Abnormal siot in/ slot out
Abnormal loading
AVIS
A ) DIA
A
3DNR module (HRO01 ) is checked with the
following procedures, and if some defects are
found, replace the module with new one.
2-4-1. Example of operation check procedure
M3071)
ON
viva
ol!
LOOUYH
1) Preparing equipments
* V-856B
* Standard color bar generator
* Alignment tape
O30IA
WS000
10~4j8
O1
JINGOW
YNIE
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