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Adjustment
Method :
Supply Pinch Roller!
:
Note:
Only perform this adjustment when the supply
TC-K670/K877ES
pinch roller is to be replaced.
Insert
the mirror
cassette
and put the unit in
record/playback
mode.
Check to see whether
the tape is curling at the
record/playback
head guide or the pinch roller
guide.
If it is curling, remove
the curl by adjusting the ®
tape
curl
adjustment
screw.
Then, check
that
the
tape is running past the middle of the erasehead.
Record/ playback
Head
Note:
Only perfom this adjustment when the record
/playback
head is to be replaced.
Insert
the
mirror
cassette
and
put
the
unit
in
record/ playback mode.
(Height Adjustment)
Check to see if the tape is
curling at the tape guide of the head.
If it is
curling, tighten screws @, ©, and @, respectively
by the same
angle, moving
the head so that it
remains
at
the
same
angle
throughout
the
procedure.
If it curls on the bottom side of the
mirror cassette (actually the inner side), tighten
all the screws
equally;
but loosen
them if the
tape begins to curl on the top side (outer side).
ane = , Outside
normal
Curling on the
Curling on the
(record/playback head
inner side.
outer side.
as seen from the side
Tighten screws
Loosen screws
of the erasehead.)
4, ©, and @.
@,®, and @.
(Declination Adjustment) While in the record/
playback position, set the back tension to 0 (wind
the supply reel with something thin like a pencil
in a counterclockwise
direction) and make
sure
there
is no
curling
or
shifting (shifting
up/
shifting
down)
at the
guide
of the
record/
playback head.
Because
shifting can only occur due to a difference
in the width of the tape and that of the tape guides
(curling will otherwise occur), it is necessary to pay
close attention since it can be easily overlooked.
When there is a shift, tighten screws
© and @ equally
and change the declination of the head.
If the tape
is shifting up, tighten the screws, and if it is shifting
down, loosen them.
Repeat the adjustments in steps 2 and 3 and fine
adjust the height and the declination.
(Preliminary Azimuth
Adjustment)
After demagnetizing and cleaning the adjustment
head, play back WS-48B
(3 kHz, 0 dB).
Turn
screw @ so that the reading on the level
meter
of the unit
or
that
of the
level
meter
connected
to LINE OUT
is maximized.
If the screw is turned at least half a revolution,
repeat the adjustments
from step 1.
(Tape
Path
Check)
Connect
the oscilloscope
to
LINE OUT and play back P~4-A100 (10 kHz, -10
dB) to display
a resurge
waveform.
After
20
seconds
of record/playback
(after
the tension
within the loop has been increased sufficiently),
make sure the variation in the resurge is within
+ 90 degrees (within +45 degrees is desired).
If the variation is greater than this, it is because
the declination
and/or
the height adjustment
is
not perfect.
Repeat the adjustments from step 1.
test tape
P-4-160
(10 kHz, ~10 dB)
Oscilloscope
L-CH
47kQ
LINE CUT
Oscilloscope Resurge Waveform
OOAOOQV®
In Phase
45°
cases
180°
SRL). coli
en
Good
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