Teac A-6010SL User manual

TEAC
*o"
SERVICE MANUAL
TEAC
CORPORATION
U.S.
DISTRIBUTOR:
ae
TE
EEDRET
HARE
AMERI(A
MONTEBELLO, CALIFORNIA 90}40
U.S.A.
SALES
OFFICE:
SHINJUKU
BUILDING
EUROPEAN
DISTRIBUTOR:
TEAC
EUROPE
N.V.
}-8-1,
NISHI-SHINJUKU,
SHINJUKU,
TOKYO
KABELWEG
45-47,
AMSTERDAM
W.
2,
HOLLAND
MT601
]
El
00
PRINTED
IN
JAPAN
8718
-S-0032

Ee
he
Se
eS
ee
OS
Qed
ee
ge
eT

1
GENERAL
DESCRIPTION
The
TEAC
A-6010
has
achieved
an
enviable
reputation
for
quality
since
its
introduction
five
years
ago.
During
this
period
many
design
im-
provements
and
modifications
have
been
incorporated.
However,
the
re-
cent
introduction
of
more
versatile,
improved
tape
products
called
for
extensive
modification
and
redesign
in
order
to
provide
proper
utili-
zation
of
these
tapes.
Therefore
we
have
produced
the
new
A-6010SL,to
provide
complete
flexibility
in
selection
of
recording
tapes
and
to
meet
the
stringent
requiements
of
these
tapes.
The
basic
design
of
the
A-6010SL
is
highly
similar
to
that
of
the
A-6010,
Therefore
information
in
this
service
manual
may
be
applied
to
the
A-6010.
If
adjustments
or
repairs
are
too
complicated
and
are
difficult
for
you
to
accomplish,
or
if
you
have
any
technical
questions,
please
contact
the
nearest
TEAC
dealer
or
TEAC
Corporation
or
affiliated
corporations.
INDE X
1. GENERAL DESCRIPTION
2. SERVICE DATA
3. EQUIPMENT REQUIRED
4. PARTIAL DISASSEMBLY
5.
HEAD
ALIGNMENT
-MECHANICAL-
6.
MEASUREMENT
AND
ADJUSTMENT
-MECHANICAL-
7.
MEASUREMENT
AND
ADJUSTMENT
-ELECTRICAL-
8.
PREVENTIVE
MAINTENANCE
9. TROUBLE SHOOTING
10. WARRANTY
11.
PACKING
FOR
SHIPMENT
12. SCHEMATIC DIAGRAMS
13.
PRINTED
CIRCUIT
BOARD
AND
PARTS
LIST
14.
EXPLODED
VIEW
AND
PARTS
LIST
15. MANUAL CHANGES
5
3

2 SERVICE DATA
MECHANICAL
Heads:
Tape Width:
Tape Speed:
Motors:
Wow and Flutter:
Fast Winding Time:
Operating Position:
Power Requirements:
Weight:
4-4 track 2 channel stereophonic.
Erase Record Forward play and Reverse play;
Erase head,
1.8k ohm/100kHz, erase current approx. 30mA
Record section,
100 ohm/1kHz, bias current approx. 2mA
Playback,
3k ohm/1kHz -63dB
Standard 1/4 inch tape
3-3/4ips and 7-1/2ips(t0.5%)
1 - two speed hysteresis synchronous motor
for capstan drive.
2 - six pole eddy current motors for reel drive.
0.06% at 7-1/2ips.
0.09% at 3-3/4ips.
Wow and flutter measured according to weighted
NAB standard using TEAC flutter free tape.
Approx. 90 second or less for 1,200 feet.
Horizontal or vertical.
100/117/200/220/240V AC 50/60Hz 140W
52 lbs(net.)
Fig. 2-1 Dimensions
Specifications and components subject to change without notice,

i
ELECTRICAL
Transistors:
2SC1OOOBL
x
2
28C733Y
or
2SC536F
x
5
2SA572YL4
x
2
2SC971
x
2
2SC536F
x
2
2SD
235
x
1
2SC693F
x
2
2SA494-Y
x
2
IC:
IC101/201
TEAC
42709
IC102/202 TEAC 42709
1C103/203 TEAC 42710
Diodes:
SIBO1-02
x
5,
SIBO1-06
x
8
Frequency
Response:
Overall
from
recording
INPUT
to
playback
OUTPUT.
7-1/2ips, +2dB 30Hz - 20kHz
3-3/4ips, +2dB 40Hz - 10kHz
Equalization:
NAB
equalization
7-1/2ips
50u
sec.
3-3/4ips
90u
sec.
Input:
MIC:
600
ohms,
-—70dB
(0.
25mV)
LINE:
50,000
ohms
or
more,
0.1V
Output:
LINE:
0.3V
for
load
impedance
of
10,000
ohms
or
more
HEADPHONES:
§8
ohms
Bias
Freq.:
100kHz
push-pull
oscillator
Signal
to
Noise
Ratio:
50dB
or
more
Peak
record
level
to
unweighted
noise
Cross
talk
Rejection:
Channel
to
channel
at
1kHz/45dB
or
more
Adjacent
track
at
100Hz/40dB
Erase
Efficiency:
65dB
or
more
at
7-1/2ips
NOTE
As
a
result
of
continuing
changes
and
improve-
ments
during
the
production
run,
minor
differ-
ences
may
be
found
between
early
and
later
ma-
chines,
refer
to
manual
change
sheets
for
in-
formation
concerning
modifications.

3 EQUIPMENT REQUIRED
FOR MECHANICAL MEASUREMENT
SPRING SCALE: 0 - 3kg(0 - 8 lbs)
0 - 300g(0 - 10 oz)
TEST TAPE: TEAC YIT-2003 (7-1/2ips)
TEAC YTT-2002 (3~3/4ips)
FLUTTER METER: SENTINEL INC FL-3D-1 .
DIGITAL FREQ. COUNTER: Capable of 0 to 5kHz indication.
TOOLS: General, 2mm nut driver, Hex head
Allen wrench
Fig. 3-1 Spring Scale
|
Fig. 3-2 TEAC Hex Allen Wrench Fig. 3-3 TEAC Test Tapes
FOR ELECTRICAL MEASUREMENT
«TEST TAPE: TEAC YTT-1003 for 7-1/2ips
TEAC YTT-1002 for 3-3/4ips
SCOTCH 203 and 150 for recording test.
EMPTY REEL: TEAC RE-702(2" hub)
TEAC RE-701(4" hub)
TEST SET: TEAC M-826A test set
NOTE
Use of the TEAC M-826A test set is recommended
This set incorporates an AC VIVM, Audio Oscil-
lator, Channel Selecting switch, Variable At-
tenuator, Monitor Speaker and Cables.
TEAC M-826A measures the RMS value of the Volt-
age(OdB=0.775V). Characteristics of this test
set are similar to the standard VU-meter.
Fig. 4-4 TEAC Test Set
VIVM: hp model 4302B or equivalent
_ RESISTOR: ; Non inductive type 8o0hm/1W
BAND PASS FILTER: TEAC M-206A(1kHz)
OSCILLOSCOPE: General purpose

4 PARTIAL DISASSEMBLY
CAUTION
Do
not
attempt
complete
disassembly
of
any
of
the
subassem-
blies.
The
list
of
individually
replaceable
parts
in
the
exploded
view
should
be
used
as
a
guide
to
disassembly
limits.
Tape Transport:
1.
Remove
power
cord
and
other
connecting
cords.
2. Lay the equipment face down on a soft mat.
3. Remove the 2 rear cover screws.
4.
Remove
3
upper
screws
on
both
sides
of
the
case.
5.
Lift
the
case
from
the
transport.
Amplifier:
1.
Remove
2
screws
on
both
sides
of
the
case.
2..
Lift
the
amplifier
from
case.
Removing the equipment from case

HEAD REPLACEMENT
CAUTION
Power to the unit must be switched off when removing the heads,
this to prevent transient pulses from passing through the heads
causing strong magnetization or damage to the delicate windings.
After head replacement, thorough demagnetization is recommended.
NOTE
The heads of the A-6010SL can be changed either as a complete
assembly or individually as necessary.
HEAD ASSEMBLY REPLACEMENT
To change the head assembly as a unit,
remove the four mounting screws, (one
on each end).
Note the positions of the wires on the
circuit board before unsoldering.
Solder the wires of the new heads in
exactly the same positions.
Fig. 4-1 Head Assy
INDIVIDUAL HEAD REPLACEMENT
To replace a single head, a special 2mm
nut driver is required. Remove the two
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.
Head installation mounting provides for
left or right positioning. After in-
stalling heads, determine proper posi- :
tion while recording or playing back a it i pL AYBACK
tape. HH i HEAD ONLY
D-11-4
Fig. 4-2 Individual Heads

CAPSTAN
MOTOR
———————————————————.,—0O00
Orr
_—
eS
or
—
ev
1.
2.
3.
4.
After motor replacement, check position of
capstan pulley on shaft for proper alignment
with belt guide.
REEL MOTOR
Remove the fan.
Remove the capstan belt.
Remove the top ® spring clips holding
mount stand offs.
Remove the four screws holding the motor
and shield plate. -(top)
Unsolder the six wires connecting the
capstan motor.
Remove the four screws holding the motor
and shield plate. ~(bottom)
Loosen the two set screws (HEX HEAD) in
pulley and lift off pulley.
NOTE
Fig..4-3 Capstan Motor Removal
Reel
motor
assemblies
are
mirror
images
of
each
other,
these
assem-
blies
are
not
interchangeable.
Using hex head wrench, loosen the two
screws on the counter belt pulley.
Remove pulley(right turntable only).
Remove the rubber insert, then remove
the three screws holding reel table
to motor.
Remove the three screws holding the
reel motor to the mount.
Unsolder four wires connecting the
reel
motor
and
remove
motor
from
panel.

CAPSTAN ASSEMBLY
CAUTION
A clearance of 0.02" must be maintained between
capstan assembly.
the flywheel and
1. Unscrew capstan cover(front panel).
2. Remove two screws from rear bracket,
allow bracket to drop forward floor
case.
Remove capstan belt.
Loosen two screws in capstan assy.
flywheel.
5. Remove three screws in capstan assy.
6. Gently move capstan assy up and down
until it slides out of panel.
Ww ee
Fig. 4-5
TENSION ARM ASSY -LEFT-
Remove coil spring.
Unscrew spring rod.
Remove the brass collar and washer.
Unsolder the two wires (1 white,
1 black) from terminal strip.
5. Lift out tension arm.
BwWNPH
Fig. 4-6
TENSION ARM ASSY -RIGHT-
Remove coil spring.
Loosen set screw in retainer assy.
Remove retainer assy and washer.
Lift out tension arm.
FwWN rE
Fig. 4~7
CAPSTAN
COVER
T Cro
Capstan Assy Removal
Tension Arm ~Left-
GEFennes
GS SET screw
Tension Arm -Right-

5 HEAD MECHANICAL ALIGNMENT
NOTE
Head alignment is adjusted at the factory to very critical tol-
erances. Normally HEAD ASSEMBLY replacement will require only
minor alignments or adjustments.
Complete readjustment should only be necessary after an individ-
ual head is replaced.
The adjustments are made as follows:
ERASE
HEAD
SECTION
The erase head pole should be above the edge of a threaded tape by
the width of heavy pencil line.
RECORD
HEAD
SECTION
The record head pole should be above the edge of a threaded tape by
the width of a thin pencil line.
© xHeictx
@ azimuth
°
o ° ° oa
ae
se 2 fs
[x] [x]
ERASE RECORD REVERSE FORWARD
PLAYBACK -~.
* ar ar a1— Argos
ar. ar at 21-— A- 7030S.
(FORWARD ONLY}
vos
Fig. 5-1 Head Alignment And Adjustable Screw
PLAYBACK HEAD -—FORWARD-
The pole of the playback head should be even with the top of a
threaded tape.
PLAYBACK HEAD -REVERSE-
The pole of the playback head should be even with the bottom of a
threaded tape.
NOTE
Azimuth adjustments are given in the section on MEASUREMENT AND
ADJUSTMENT -ELECTRICAL-

6
MEASUREMENT
AND
ADJUSTMENT
-MECHANICAL-
The TEAC A-6010SL uses a highly reliable three motor drive sys-
tem and should require a minimum of mechanical maintenance or
adjustment.
These adjustments are made at the factory.
only
be
required
after
many
hours
of
operation
or
component
re-
placement.
Readjustment should
PINCH
ROLLER
PRESSURE
———————___________________—
1.
2.
3.
NOTE
Pinch
roller
pressure
is
supplied
by
pinch
roller
spring
arm
only
and
it
is
most
important
that
the
solenoid
plunger
be
fully
bottomed
before
taking
pressure
measurement.
Load
tape
or
lock
the
shut-off
arm
in
the
on
position.
Attach
a
suitable
spring
scale
to
the
pinch
roller
shaft.
Place
the
unit
in
the(
[>
)
PLAY
mode,
and
holding
the
spring
scale
as
illus-
trated,
slowly
draw
it
away
from
the
pinch
roller.
Do
not
allow
the
string
to
rub
against
the
pinch
roller.
Note
the
reading
on
the
spring
scale
at
the
instant
the
pinch
roller
stops
rotating.
The scale should indicate 2.8 - 3.lkg
(6.6 - 7.2 lbs). Optimum value is
3.0kg.
If adjustment is necessary, adjust the
takeup double nut on the CAPSTAN SOLE-
NOID.
ADJUST DOUBLE NIT”
0475
CAPSTAN
PINCHROLLER
SPRING SCALE
D-II-13
1
'
t
'
'
1
,
v
Fig. 6-1 Pressure Measurenent
-Pinch Roller-

TORQUE MEASUREMENT PROCEDURE
IMPORTANT
Be sure the full required line voltage is applied and that
the unit is set to the proper line frequency.
BACK TENSION Forward
1.
Load
tape
or
block
the
shut-off
arm
in
the
on
position.
2.
Place
an
empty
7"
reel
with
a
2"
diameter
hub on
left reel
table.
3.
Rotate
the
reel
and
wind
several
turns
of
string
around
the
hub.
Attach
spring
scale
to
string.
4.
Place
the
unit
in
the
(
C>
)
play
mode.
-
5,
Pull
the
scale
away
from
the
reel
against
the
motor
torque,
with
a
smooth
steady
motion.
6.
Note
the
scale
reading
while
it
is
in
steady
motion.
7.
Make
sure
the
string
does
not
rub
against
the
reel
flanges.
8.
If
necessary,
abjust
resistor
R-4
slider
(B)
until
a
scale
reading
of
210
-
230g/cm
(2.9
-
3.20z-inch)
is
obtained.
Reverse
9.
To
check
the
reverse
back
tension,
place
the
reel
and
spring
scale
on
the
right
reel
table
(see
figure)
and
repeat
above
procedure
pressing
(<1
)
play
button.
10.
If
necessary,
adjust
resistor
R-3
slider
(B)
until
a
scale
reading
of 240 - 260g/cm (3.4 - 3.60z-inch) is obtained.
R7
REVERSE FORWARD
AKE
TENSION TENSION
a
i] y
aetna ticcccits rem Jes
mun ) o}
| |
FORWARD REVERSE
BACK TAKE UP 0- 0463
TENSION TENSION
Fig. 6-2 Adjustable Tension Resistor

TAKE-UP
TORQUE
-Forward-—
———————————
ee
00€0T
1.
Place
the
empty
reel
and
attached
spring
scale
on
the
right
reel
table.
. Place the unit in the (rc ) play mode.
3.
Allow
the
rotation
of
the
reel
to
slowly
draw
the
scale
toward
the
hub.
;
4.
Hold
the
spring
scale
with
enough
force
to
allow
a
steady
reading.
5.
If
necessary,
adjust
resistor
R-3
slider
(A)
until
a
scale
reading
of
340
- 370g/cm
(4.8
- 5.20z-inch)
is
obtained.
bo
Reverse:
6.
Place
the
empty
reel
and
spring
scale
on
the
left reel
table
and
select
(<i
)
reverse
play
mode.
7.
The
measurement
of
reverse
take-up
torque
is
as
above
with
the
ex-~
ception
that
rotations
are
clockwise.
8.
If
necessary,
adjust
resistor
R-4
slider
(A)
until
a
scale
reading
of
470
-
510¢/cm
(6.6
-
7.loz-inch)
is
obtained.
HALF-MIL
TENSION
—————————————_______—_———???.kR
nn
oevqaeorr—
When
the
TAPE
button
is
in
the
THIN
position,
the
reading
on
the
scale
should
decrease
by
1/3
ounce
from
the
normal
reading.
If
adjustment
is
required,
adjust
the
slider
of
R-5.
Ghana
«Dp
BACK
TENSION:
TAKE
UP
TORQUE
TAKE
UP
TORQUE:
BACK
TENSION
TEAC TEAC Sroee4
RE-701 RE-701
Fig. 6-3 Torque Measurement
REWIND
BACK
TENSION
Load
a
full
1,800ft
reel
of
tape
on
the
right
reel
table.
Place
the
empty
reel
with
2"
hub
on
the
left
reel
table.
Place
the
unit
in
the
fast
rewind
mode,
(<I
).
Attach
scale
to
right
tension
arm
tape
guide
exert
steady
pull
on
scale
until
tension
arm
begins
to
move
to
the
right
at
this
point.
A
reading
of
504+10g(0.7oz-inch)
should
be
obtained.
If
different
adjust
resistor
R-7
slider
to
obtain
proper
reading.
PON eH

BRAKE TORQUE
NOTE
The brake torque is actuated mechanically. Pressure is
set by the variable spring force.
While making this measurement and adjustment, be carefull
not to bend the brake bands.
As brake torque will change with cleaning brake drums and
brake shoes should be cleaned only when absolutely neces-
sary. If cleaning is required, use TEAC cleaner TZ-251B
only. After cleaning operate the machine for some time
before performing the below procedures.
1. Brake adjustments are made with no power applied to the unit.
2. Place an empty 4" hub reel on the left reel table, and fasten one
end of a 30" length of string to the reel anchor.
3. Wind several turns of string counterclockwise around the hub and
attach a suitable spring scale to the free end of the string.
4. Pull the spring scale away from the reel, making sure that the
string does not rub the reel flanges.
5. Take a reading only when the reel is in steady motion since the
force required to overcome static friction will produce a false,
excessively high initial reading.
6. The reading should be 1,500%50g.
7. If different, adjust the left motor brake by holding the adjust-
ing rod and loosening the nut on the locking collar. Then slide
the rod through the collar and retighten the nut. Pulling the
rod out tightens the brake.
8. To adjust the right reel brake repeat all steps as described for
the left reel with the exception that all directions of rotation
are clockwise.
TEAC
RE-701
Fig. 6-4 Torque Measurement Fig. 6-5 Adjustable Location
-Brake-
-Brake-
IMPORTANT
The difference in torque between the right and left brake
should be kept within 50g(0.7oz-inch).

FLUTTER
nnn
Flutter
should
be
measured
in
playback
mode
using
a
TEAC
flutter
free
tape
YTT-2003+2002
and
a
Sentinel
Inc
model
FL-3D-1
flutter
meter.
Measurement
of
flutter
should
be
made
in
accordance
with
NAB
stand-
ards.
Values
obtained
by
a
different
standards
or
equipment
cannot
be
com-
pared.
Flutter
should
not
exceed
0.06%
for
7-1/2ips
and
0.09%
for
3-3/4ips.
These
figures
apply
to
any
tape
position
and
direction(such
as
full
take-up
reel,
full
supply
reel
or
about
mid
point).
If
flutter
is
excessive,
refer
to
trouble
shooting
chart
in
this
manual.
FLUTTER FREE TAPE
wow METER
D-0399
Fig.
6-6
Test
Equipment
Set-Up
Flutter
And
Tape
Speed
TAPE
SPEED
The
tape
speed
should
be
measured
using
TEAC
flutter
free
tape,
mode.
YTT-2003+
2002.
These
tapes
contain
a
highly
accurate
3kHz
tone.
Connect
a
digital
frequency
counter
to
either
line
LINE
OUT
jack.
The
indicated
frequency
should
be
3kHz
0.7%
for
all
speeds.
FAST
WIND
TIME
—_—_——
em
i
NOTE
Clean
all
tape
guide
components
and
check
for
proper
AC
line
voltage.
Using
a
1,200
foot
tape
on
a
7"
reel,
the
fast
wind
time(fast
forward
or
fast
rewind)
should
be
90
seconds
or
less.

VOLTAGE
AND
FREQUENCY
CONVERSION
Uuit
must
be
set
to
the
power
line
frequency
available.
Improper
frequency
setting
will
result
in
a
20%
error
between
the
tape
speed
and
reel
motors
torque.
NOTE
US model is preset to 117V AC and 60Hz. No frequency conversion
is required.
If it should be necessary to convert the A-6010SL deck to operate
from a power source of different voltage or frequency, it may be
easily accomplished as follows:
Voltage Conversion:
The A-6010SL may be set for 100, 117,
200, 220 or 240 volts. To change the
voltage unscrew the fuse in the center
of the voltage selector plug. Pull out
the plug and reinsert it so the desired
voltage shows in the cutout. Reinstall
the fuse.
Frequency
Conversion:
1.
2.
Disconnect power cord and remove rear
deck cover.
Set frequency selector switch (above
motor) to the required frequency.
Loosen
red
washered
screw
holding
fre-
quency shift lever in position.
While manually rotating the motor
counterclockwise push frequency lever
in for 50Hz - pull out for 60Hz oper-
ation. This lever changes the belt
to the proper pulley steps.
Tighten the red washered screw to lock
frequency shift lever into position.
Fig. 6-7
Fig. 6-8
voltage convrsion
—neenne FREQUENCY
SELECTOR SWITCH
FREQUENCY
SELECTOR LEVER
frequency convrsion
b-0470

7 MEASUREMENT AND ADJUSTMENT
-ELECTRICAL-
GENERAL NOTICE
Before
performing
maintenance
on
this
unit,
thoroughly
clean
and
demagnetize
the
entire
tape
path.
It
is
important
that
the
unit
be
set
to
the
proper
voltage
and
frequency
for
your
locality.
TEAC
specified
standard
test
tapes
and
test
equipment
must
be
used
when
per-
forming
maintenance
to
insure
reliable
results.
Procedures
for
checks
and
adjustments,
Loz
unless
otherwise
indicated,
are
for
the
left
channel
at
a
tape
speed
of
7J-1/2ips.
The
same
procedures
are
to
angeles
be
applied
to
the
right
channel
and
a
ae
again
for
both
channels
at
3-3/4ips,
and
both
directions
of
playback.
All
controls
mentioned
in
this
book
will
be
printed
in
bold
letters
and
will
be
exactly
as
they
appear
on
the
unit.
Double
designated
symbol
numbers
refer
bscdae
to
left
channel/right
channel.
P
Fig.
7-1
Adjustable
Parts
Location
T
HD
:
Third
Harmonic
Distortion.
NOTE
HIGH: For use with high performance tipes
. such as Scotch 203 or BASF LP~35EH.
VRI09 — ae eee ts - VClo2 NORMAL: For use with conventional tape such
as Scotch 150 or equivalent.
VR103/203 PLAYBACK LEVEL SET
VR104/204 VU METER CAL. -NORMAL-
VR107/207 VU METER CAL. -HIGH-
VR101/201 PLAYBACK EQ. (7-1/2ips)
REC LEVEL BIAS VR102/202 PLAYBACK EQ. (3-3/4ips)
7 VR105/205 INPUT LEVEL SET
VC.01 VR106/206 VU METER CAL. -INPUT-
L103/203 BIAS TRAP -REC AMP-
L101/201 BIAS TRAP ~LINE OUT-
L102/202 REC EQ. FOR 7-1/2ips.
VR 209
VRIO8
VR208
VC102/202 HIGH, BIAS ADJ.
0-0474 VC101/201 NORMAL, BIAS ADJ.
ig.
7-
el
Bias
Adjustable
Location
8109/209
HIGH,
REC
LEVEL
SET
Ete
p
ie
BEG
ey
.
ss
VR108/208
NORMAL,
REC
LEVEL
SET
|
|
|
;

PLAYBACK PERFORMANCE
Qio2/202 Qi08/205 =8dB seas
«18.9v> ‘ —©)
Qio3/203
(205v)
(12.5V)
Quov201
PLAYBACK
HEAD
PHONE:
FWO me =
eg oe
Om
on
VRiov20
VRI02/202
~2948
9
33%
7
Fn
fe]
a
=
pvefel
vitor, zv20r f
nev
HIGH -3208
NORMAL-2368
Fig. 7~3 Simplified Diagram -Playback-
PLAYBACK HEAD AZIMUTH ADJUSTMENT
Coarse Adjustment
1. Connect a level meter to either LINE OUT jack.
2. Thread a TEAC test tape YTT-1003 on the unit.
3. Play the 15kHz test tone in section 2 of the test tape.
4. Slowly rotate the azimuth screw until maximum indication is obtain
on the level meter. Repeat step 4, procedure for reverse head.
NOTE
If during playback, a slight pressure on the heads results in
a rise of the reading of the level meter, head alignment ad-
justments should be accomplished.
Fine Adjustment
CAUTION
After coarse adjustment, do not make large corrections, turn
Azimuth screw 1/4 turn or less.
5. It is absolutely essential to accomplish the coarse adjustment
before using this method to avoid phase errors larger than 45°
6. Connect the test equipment as shown in Fig. 7-10
7. Play a 10kHz signal and adjust the azimuth screw until the oscil-
loscope shows that the signals are less than 45° in phase.
Repeat above step for reverse head.
8. Secure the screw with a drop of LOCTITE.