Head Replacement And Alignment; Mechanical - Teac A-3440 Service Manual

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 man-
ner. Replace the nuts securing the new head to the plate.
Perform head alignment before operation.
PLAYBACK HEAD
only
SHIELD
Fig.6-1 Head Replacement
6-2 HEAD ADJ. SCREWS AND ALIGNMENT
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o °
pe o>"
© \©Ye©O0® ae
a) ©
T-1286
® Azimuth adj. screws
rf) Height and Tilt adj. screws
O) Tangency adj. Nuts
Fig. 6-2 Head Adjustment Screws and Alignment
10
6-3 VISUAL HEAD ALIGNMENT
Since the head alignment critically affects the frequency
response on both playback and recording, the head align-
ment should be done carefully. The head can be adjusted for
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
| 2) Neer eran 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 the electrical head alignment
paragraph which follows in this Service Manual.
6-4 MIS-ALIGNMENT OF THE HEADS
TILT HEIGHT
(view from side of head) (view from front of head)
i 4
Adjust by @ Screws
Adjust by @ Screws
AZIMUTH
{view from front of head)
Adjust by @ Nuts Adjust by @ Screws
T-619
Fig. 6-3 Head Mis-Alignment — Examples —