Teac A-7300RX - Page 11

7. HEAD REPLACEMENT AND ALIGNMENT
—MECHANICAL—
7-1
HEAD
REPLACEMENT
1.
Remove
head
housing
and
head
ass’y.
Refer
to
section
4-2
on
page
7.
2. Loosen 2 counter-sunk screws (A) from the rear plate of
the
head
assembly
and
remove
2
small
screws
(B)
from
the
top
of
the
head.
Then
slide
off
the
shield
case
(C).
3.
To
replace
a
single
head,
a
nut
driver
is
required.
Re-
move
the
2
nuts
(D)
on
the
defective
head
through
the
access
hole
provided.
This
releases
the
head
from
the
mounting
plate.
ue
Plate
Fig. 7-1 Head Replacement (Playback)
7-2 HEAD ADJ. SCREWS AND ALIGNMENT
T-362-1
@ : Azimuth adj. screws
© : Height and Tilt adj. screws
©: Tangeney adj. Nuts
Fig. 7-2 Head Adjustment Screws and Alignment
12
7-3, VISUAL HEAD ALIGNMENT
Since the propriety of head alignment affects the frequency
response on both playback and recording, the head align-
ment 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
TPs start es 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
realigned according to electrical head alignment
paragraph which follows in this Service Manual.
7-4 MIS-ALIGNMENT OF THE HEADS
TILT HEIGHT
(view from side of head)
(view from front of head)
Adjust by @ Screws
Adjust by @ Screws
[2] TANGENCY
(view from top of head)
AZIMUTH
view from front of head}
i
7 (3)
Adjust by @ Nuts Adjust by @ Screws
Teo
Fig. 7-3. Head Mis-Alignment —Examples—