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Cytinder assembly replacement
1. AUDIO HEAD HEIGHT
ADJUSTMENT {AUDIO HEIGHT
ADJUSTING SCREW)
Ptayback
the Lape recorded in SP
mode. Adjusi position of fhe upper
flange of tape and that of
the
acho head.
2. AUDIO HEAD TILT ADJUSTMENT
{TILT ADJUSTING SCREW)
Playback
the
tape m
SP
mode
conlinuously. Adjust Audio head tit
acraw So that tape transports along
lower Range of No. & guide.
3, AUDIO AZINUTH ADJUSTMENT
(AZIMUTH ADJUSTING SCREW}
Playback
7 kHz
audio
signal on
alignment
tape and adjust
for max.
Cutpat,
4, ACE HEAD POSITION
ADJUSTMENT
Playback
video
envelope
signal
3 MHz (A ch} on alignment
tape nm
SP mode. Sel tracking control at its
center. Adjust ACE
main basa to
obtain
max. output
TOSHIBA V 856 B
=>
Adjust as descnbed in he Electrical
Adjustmem Section (Servo circuit.) in
each service dala.
Tension lever assembly replacement
1, MAXIMUM ENVELOPE OUTPUT
Playback the 3 MHz video signat
On Ibe alignment tape,
Trigger scope with swiching pulse.
Adjust Wwacking
control
for maxi-
rym
envelope output by pushing
channel
{iracking)
upfdown
but-
tons.
_ ENTRANCE
SIOE ENVELOPE
ADJUSTMENT
Rotme
S guide roler
untd entrance
skia envetope becomes as Nat as
possitie.
_EXIT SIDE ENVELOPE
ADJUSTMENT
Rotate
T guide rofler until exit tide
envelope
becomes
as
fat
2s
possible.
_ LINEARIFY CHECK
Press
the channel
(tracking)
up/
down
buttons
afternately,
make
sure
envelope
increases
of de-
creases
with Hat response kept.
cae
6.75
iS-VHS modal)
b, wa 2 0.463
b,¢.d/az
0.75
(Non S-VHS model)
For the linearity adjustment, make"
sure
adjusted
value
should
be
checked
with 3 MHz
(SP) video
signal
after
completion
ol
spetitied
adjustments
using
3
MHz
{LP}
vkleo
signal
in
alignment tape.
10
Tape Transport System Adjustment Flow Chart
1. ACE HEAD HEIGHT FINE
ADJUSTMENT
Playback stereaphonic altemative
fecording signal (300-500H2)
on
alignment tape.
Tum
ithe
Audio
height
adjusting
2. AUDIO HEAD TILT FINE
ADJUSTMENT
Playback alignment
tape in CUE or
double speed mode.
Adjust Audio head tit until tape
rungs along lower flange of No. &
guide.
3. ACE HEAD HEIGHT FINE
ADJUSTMENT
Playback alignment tape 2s de-
scribed in step 1, Make sure aucid
envelope signa! becomes as flat as
possible
4, AUDIO HEAD AZIMUTH
FINE ADJUSTMENT
Playback 7 kHz audio signai an
ahgnment tape.
Turn the azimuth adjusting screw
lo obtain maximum output.
5. AUDIO HEAD HEIGHT CHECK _
Repeat same step 6s step 3.
5}
§
No. 9 guide lever check
Chack for ansitional operation
1. TAPE WRINKLE CHECK
+
Playback
E-240 lape in Review
mode.
»
Confirm
the portion
of upper!
lower flange on No.8 guide.
it lape travets
out of upper/lower
flange as shown above, pinch lever
Of capstan motor
or No.9
guide
lever is defective.
Replace the defective partis}.
8. ACE HEAD POSITION
* Sel tracking at its canter postion
pushing channel
(tracking)
up/
own dullons simuttaneousty.
Playback
3 MHz
video
signal
{LP
mode}
on
the
signmen
lape.
Slide
ACE
main
base
to
obtain max, envelope
Playback
3 MHz
{A chi video
signal
(LP
mode)
aon
the
aligrenert tape
Contiim
thal
difference
trom
tracking
center
is within 3 ms
when
maximum
envelope
is
cotained
* It not, readjust in LP mode.
9 Checks for Hi-Fi models only.
AFM envelope output max.
Recorded & reproduced
8)
1. Playback
3 MHz
video
signal
{LP mode} in alignment
tape and
sel review mode.
+ Recotds
signals
in SP
& LP
modes, using E- 180. E-240 tape
+
Run €-240 tapa m each mode
Playback 3 MHz video signal.
400 Hz AFM signa! in alignment
tape ST-C7 in SP mode.
Check
video @nvelope max.
point
(A ch).
Check
control
pulse
phase
dit-
ference is wilhin +3 ms from that
point to AFM envelope max. powst.
and check there is no damage at
and
playback
them
jo check
each guide.
envelopes.
2. Change
mode
from
review
ta
play and
check
entrance
side
envelope rises within 3s.
Check
enwance
side envelope
tised within 3s, when
mode
ix
changed from siot-in 10 play.
cfaz
0.75
iNon $-VHS model)
b, dat
0.63
bc. daz
0.75
{S-VHS mode?)
Back to step 3) bnearity
adjustment.
(or Slider assembly replacement}
4. Check step 2 and 4 i no good.
teplace S sider assy or tension
lever.
Back
to step 1} ACE head assembly
coarse adjustment.
of Pinch lever
replacement
Back to step 6) cheek for
————
ACE height adjusting screw
ACE head
Genaiiotel
me
/K®)
lor Tension lever replacement)
/
Back to step 5} No.9 guide lever check or
1) ACE head assembly coarse aciusiment
ACE head position adjusting si
_
os,
(Pinch lever, No.9 fever,
{Insert a slot-type screwdriver }
pee ener
Capstan motor replacement)
————
nn
ATU
adUStING Screw
Back to Step 3) bnearity adjustment
(or Slider assembly reptacemem)
lays is
sid aks
Back to step 3) fineanty adjustment.
° VIR appked SP mode only, Use
3 MHz
(A oh} video signai (SP
mode)
instead
of 3 MHz
video
signal (LP mode}.
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