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1-3-5. Reel Table Height Adjustment
Reel height adjustment is requlred only If a reel
motor has been replaced or if tape rubs exces-
sively against the reel flanges.
Adjustment is accomplished by loosening the
reel set screws and moving the reel table on the
motor shaft as shown ¡n Fig. 1-3-5.
Remove the top panel of the unit for access to
the set screws (2) in the reel motor shaft. Reel
table should be adjusted using standard NAB 7"
reels. With a tape loaded on the machine, posi-
tion the reel table height forsmooth tapetravel.
Be sure to tighten the set screws after adjustment
is made.
5. Siightiy loosen the mounting screws which
hold record/reproduce head in place and
adjust the tangency using adjustment screw,
for máximum output. When the máximum
output is attained, retighten both mounting
screws.
6. Reproduce the 10-kHz signal on the test tape.
A picture showing phase relations between
both channeis will be obtained on the oscillo-
scope as shown in Fig. 1-3-7.
7. Adjust the repro head azimuth screw until
the scope dlsplay shows less than 90 degree
out of phase at 10 kHz with the AF level
meter showing approximately máximum valué
for both channels.
Set Screws
Tape should
wind evenly
on reel
Reel Motor
Fig. 1-3-5
1-3-6. Head Alignment
There is no need for head height and tilt ad-
justments because the record/reproduce head of
the 388 is a semi-fixed type {erase head fully-
fixed).
Head Mounting (Record/Reproduce Head)
1. Refer to Fig. 1 -3-6.
2. Mount head to head base using mounting
screw and mount tangency adjustment screw.
3. Mount azimuth adjustment screws.
Head Azimuth Adjustmsent
1. Connect the TAPE OUT jack for TRK 2 of
the deck to the vertical input termináis of
an oscilloscope.
2. Connect the TAPE OUT jack for TRK 7 of
the deck to the horizontal input termináis of
the oscilloscope.
3. Connect an AF level meter to the TAPE OUT
jack(s).
4. Load the reproduce alignment test tape {YTT-
1003/400 Hz) to reproduce.
ERASE HEAD
REC/REPRO HEAD
(¥) TANGENCY ADJ. SCREW
© AZIMUTH ADJ. SCREWS
FiXED SCREW
Fig. 1-3-6
Trace for Track
2 alone
Trace for
Track 7
alone
If the Unes are not the same
each track alone, it indicates
tracksarenot putting out the
Adjust with the scope controls.
If the playback head is not strai
down you willseethiskindoT
Unequal
levels-
One track
or the other
is dommant.
length for
that the 2
same level.
ght up and
picture:
^—
(A bit) one.
(Asman m,salignn.ent
180 olh of pbase)
30 out of phase)
=0
0
N o t e . Somescüpes show - n
d.aqonal pomtmq to
(Perlect azimuth
pnas
O' . inphitsel
the left
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