Teac A-2300SD - Head Replacement and Alignment; Head Replacement; Head Alignment; Head Adj. Screws and Head Wiring

6. HEAD REPLACEMENT AND ALIGNMENT
6-1 HEAD REPLACEMENT
NOTE: Head alignment is adjusted at the factory to very
critical tolerance.
Normally Head Ass’y replacement will require only
minor alignments or adjustments. Complete re¬
adjustment will be necessary after ahead is replaced.
The adjustments are explained on the right.
- PROCEDURES -
To replace a single head, a special 2 mm nut driver is
required. Remove the 2 nuts 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.
6-2 HEAD ALIGNMENT
ERASE HEAD: The erase head pole should be above
the edge of a threaded tape by the
width of heavy pencil line.
Turn the three screws indicated to
obtain this height.
RECORD HEAD: The record head pole should be
above the edge of a threaded tape
by the width of a thin pencil line.
PLAYBACK HEAD: The pole of the playback head
should be even with the top of a
threaded tape. Turn the three screws
indicated to obtain this height.
NOTE: After these adjustments have been made, be sure
that all head surfaces are parallel with the tape
guide surfaces when viewed from the side.
Azimuth adjustments are given in the section on
MEASUREMENT AND ADJUSTMENT
- ELECTRICAL -
PLAYBACK HEAD:
Mounting Plate
■ 1. 111 .j| ^ Spacer
1 '
==ra-^ 10 O 1 !
J Playback
^ Head only
[shield (A)
Fig. 6-1 Head Replacement
6-3 HEAD ADJ. SCREWS AND HEAD WIRING
(^AN«E
Fig. 6-2 Head Alignment
6-4 MIS-ALIGNMENT OF THE HEADS
ALIGNMENT— The physical positioning of a tape head
relative to the tape itself. Alignment in all respects must
conform to rigid requirements in order for a unit to func¬
tion properly.
AZIMUTH— The angle of a tape head pole-piece slot
relative to the direction of tape travel.
NOTE: In order for a tape unit to work at its best, with
its own tapes as well as ones made on other units,
its play and record heads must be aligned to correct
4 possible errors as illustrated below.
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