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6. HEAD REPLACEMENT AND ALIGNMENT
— MECHANICAL —
6-1
HEAD
REPLACEMENT
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.
lome)
|
=
Nuts (A)
SS
=~ or } Playback
|
. _" Head only
fate:
» —{m
Shield
Fig. 6-1
Head Replacement
PLAYBACK
>
F&F
o
98
itte
ae
w
&
o
F
°
neem ieee L—|--For ERASE
Fig. 6-2
Head Wiring —Rear View—
6-2
HEAD
ADJ. SCREWS AND NUTS
(A)
®
Tangency adj. Nuts
Fig. 6-3
Head Adjustment Screvs znd Nuts
6-3
VISUAL
HEAD
ALIGNMENT
Since the property 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
TIE
¢
eco
ebis
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
alignment
paragraph which follows in this Service Manual.
7-4
MIS-ALIGNMENT
OF THE
HEADS
TILT
iview from side of head}
HEIGHT
iview from front of head}
crews
Adjust by @ Screws
TANGENCY
AZIMUTH
'(view from top ef head)
(view from front of head}
Adjust by @ Nuts
Adjust by @ Screws
|
T6519
Fig. 6-4
Head Mis-Alignment — Examples —
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