Teac A-3300SR - Head Replacement and Alignment - Mechanical; Head Replacement and Wiring; Head Adjustment Screws and Nuts; Visual Head Alignment

6.
HEAD
REPLACEMENT
AND
ALIGNMENT
—
MECHANICAL
—
6-1 HEAD REPLACEMENT AND WIRING
To
replace
a
single
head
a
special
2
mm
nut
driver
is
re-
quired,
Remove
the
2
nuts
(A)
on
the
defective
head
through
the
access
hole
provided.
This
releases
the
head
from
the
mounting
plate.
Note
the
position
of
the
wires
on
the
circuit
board.
Connect
the
new
head
in
the
same
manner.
Replace
the
nuts
securing
the
new
head
to
the
plate.
Perform
head
alignment
before
operation.
as)
Se
ca-— Nuts (A)
Spacer
>
oa ‘O | Playback
_-/” Head only
Ele | —[s Shield
Fig. 6-1 Head Replacement
ss
PLAYBACK HEAD
RECORD HEAD ERASE HEAD
T
TARA NAVA
> fFfa® Zou Zz
ase? 55S $ GB
L_ewo etl rev «
Fig. 6-2 Head Wiring —Rear View—
6-2 HEAD ADJ. SCREWS AND NUTS
-
® Azimuth adj. screws
© > Height and Tilt adj. screws
© Tangency adj. Nuts T-H135
Fig. 6-3 Head Adjustment Screns end Nuts
6-3 VISUAL HEAD ALIGNMENT
Since
head
alignment
critically
affects
the
frequency
re-
sponse
on
both
playback
and
recording,
the
head
alignment
should
be
done
carefully.
The
head
can
be
adjusted
in
TILT,
TANGENCY,
HEIGHT
and
AZIMUTH.
For head alignment, perform the following coarse adjust-
ments first. Then fine alignment should be accomplished
electrically while playing back the Test Tape.
Coarse Adjustment ;
Without Tape
TIED 4.5 esses ee Bh By Height and Tilt screws
This alignment is performed by viewing from
the side without tape threaded.
Check that the head surface is parallel to the
tape guide surface.
With Tape
TANGENCY ..... By Head mounting Nuts
Loosen the head mounting nuts. Adjust the
head so that the vertical alignment of the head
gap is perpendicular to the surface of the tape,
then tighten the head mounting Nuts.
HEIGHT ........ By Height and Tilt screws
This alignment is checked visually by looking
at the position of the head.
The head core for track-1 (inner core) should
be even with the inner edge of the tape.
AZIMUTH ...... By Azimuth adj. Screw
Adjust the azimuth adj. screw so that the gap
of the head is perpendicular to the tape travel.
NOTE: After this coarse adjustment is made, the adj.
screws and the Head mounting nuts should be re-
aligned according to electrical head algmment
paragraph which follows in this Service Manual.
7-4 MIS-ALIGNMENT OF THE HEADS
HEIGHT
(view from front of head)
AZIMUTH
‘view from front of head?
Adjust by © Nuts Adjust by @ Screws
Fig. 6-4 Head Mis-Alignment — Examples —