Teac A-3340 User manual
TEAC
2:33%9
SERVICE
MANUAL
1.GENERAL
DESCRIPTION
The
TEAC
A-3340
is
a
semi-professional
tape deck
capable
of
Simul-syne
recording,
Quadriphonic,
Stereophonic
and
mono-
-
phonic
recording
and
playback.
It
offers
operating
speeds
of
7-1/2
and
15
ips
and
will
accept
reels
of
10-1/2
inches
in
diameter.
The
Simul-sync
feature
permits
the
recording
of
discrete
but
synchronized
program
material
on
all
four
tape
tracks.
The
TEAC
A-3300
is
a
semi-professional
tape
deck
capable
of
Stereophonic
and
Monophonic
recording
and
playback.
It
is
available
in
three
configurations
and
offers
operating
speeds
of
either
3-3/4
and
7-1/2
ips,
or
7-1/2
and
15
ips.
The
transport
mechanisms
of
the
A-3300
and
A-3340
are
iden-
tical
with
the
exception
of
operating
speeds
and
head
con-
figurations.
This
service
manual
provides
adjustment
and
alignment
pro-
cedures,
schematic
diagram
and
parts
replacement
informa-
tion
and
the
proper
procedures
for
obtaining
necessary
re-
pair
parts.
If
adjustments
or
repair
procedures
are
not
clear
or
seem
difficult
to
accomplish
or
should
you
desire
more
detailed
technical
information,
please
contact
your
nearest
TEAC
dealer,
TEAC
Corporation
or
affiliated
corporations,
ad-
dress's
of
which
are
printed
in
this
manual.
INDEX
GENERAL
DESCRIPTION
SERVICE
DATA
.
EQUIPMENT
REQUIRED
PARTIAL
DISASSEMBLY
.
HEAD
ALIGNMENT
-MECHANICAL-
.
MEASUREMENT
AND
ADJUSTMENT
-MECHANICAL-
A-3300/MEASUREMENT
AND
ADJUSTMENT
-ELECTRICAL-
A~3340/MEASUREMENT
AND
ADJUSTMENT
-ELECTRICAL-
PREVENTIVE
MAINTENANCE
TROUBLE
SHOOTING
.
PACKING
FOR
SHIPMENT
EXPLODED
VIEW
AND
PARTS
LIST
‘PRINTED
CIRCUIT
BOARD PARTS
LIST
SCHEMATIC
DIAGRAMS
MANUAL
CHANGES
oy
oO
ON
DU
FSF
W
NY
BoE
H
oO
MECHANICAL
A-3300
Heads:
Tape
Width:
Tape
Speed:
Motors:
Wow
and
Flutter:
Fast
Winding
Time:
Power
Requirements:
-
Weight:
A-
3340
Type:
Heads:
Reel
Size:
Tape
Width:
Tape
Speed:
Wow
and
Flutter:
WEIGHT:
2.
SERVICE
DATA
Three,
4
track
2
channel
or
2
track
2
channel
stereophonic.
Erase,
Record
and
playback.
Erase
head,
1.8k2/100kHz,
erase
current
approx.
30mA
Record
head,
1kQ/1kHz,
bias
current
approx.
2mA
©
Playback
head,
3kQ/1kHz
-53dB
Standard
1/4
inch
tape
15ips
(A~3300-11),
7-1/2ips
and
3-3/4ips
Two
6-pole
eddy
current
motors
for
reel
drive.
4/8
pole
hysteresis
synchronous
capstan
motor
Playback
Overall
0.15%
for
1l5ips
0.18%
for
7-1/2ips
0.20%
for
3-3/4ips
Approx.120
seconds
for
10"
reel
(2,400
ft)
100/117/200/220/240V
AC
50/60Hz
44
lbs
(20kg)
net.
Four
track
4
channel
stereophonic
Four
track
2
channel
stereophonic
Four
track
1
channel
monophonic
Three:
Erase(Ferrite),
Record,
Playback
(Permalloy)
10-1/2"
maximum
NAB
reel
Standard
1/4
inch
tape
15ips
and
7-1/2ips
(0.5%)
0.06%
at
15ips
0.08%
at
7-1/2ips
49.5
lbs
(22.5kg)
The
following
chart
lists
the
differences
by
number
A-3300
5
-10,-11,-12
and
A-3340.
A~
3300-10
TAPE
SPEED
7-1/2ips,
3-3/4ips
HEAD
CONFIGURATION
4T
4T
2
Channel
A-3340
A-3300-11
15ips,
7-1/2ips
4T
4T
4T
4
Channel
2T
2T
2T
Half
Track
2T.
2T
2T
Half
Track
A-3300-12
|
J-1/2ips,
3-3/4ips
&
Ge
ele
ee
ELECTRICAL
A-3300
;
Transistors:
Diodes:
2SC1000(BL)
x
2
28C693(GU)
x
2
2SA6661I(S)
x
2
2SC644(T)
x
4
28C828(S)
x
8
2SC971
x
2
28C536(F)
x
2
FR2-06
x
4
FR2-10
x
1
Frequency
Response:
15ips
30Hzv22kHz+3
7-1/2ips
40H2v18kHz+3
3-3/4ips
50Hzv10kHz+3
Signal
to
Noise
Ratio:
Il5ips
52dB
or
more
Input:
Output:
Bias
Frequency:
7-1/2ips
48dB
or
more
3-3/4ips
45dB
or
more
(unweighted)
MIC:
0.3mV/10k2
LINE:
0.1V/100kQ
LINE:
approx.
0.3V/10kQ
or
more
HEADPHONE:
0.3mW/8Q2
100+5kHz
push-pull
oscillator
Crosstalk
Rejection:
35dB
adjacent
track
at
100Hz
Channel
Separation:
60dB
channel
to
channel
at
1kHz
Erase
Efficiency:
60dB
or
more
at
7-1/2ips
or
15ips
speed
ELECTRICAL
A~3340
0000
——
Frequency
Response:
Frequency
Response
at
SIMUL
SYNC:
Signal
to
Noise
Ratio:
Crosstalk
Rejection:
Channel
Separation:
15ips
30HzV22kHz
+£3dB
7-1/2ips
40Hzv18kHz
+3dB
15
&
7-1/2ips
30H2v7.5kHz
+10dB
15
&
7-1/2ips
50dB
or
higher
(unweighted)
46dB
adjacent
track
at
1kHz
43d4B
channel
to
channel
at
1kHz
NOTE
As
a
result
of
continuing
changes
and
improvements
during
the
production
run,
minor
differences
may
be
found
between
early
and
later
machines.
Refer
to
manual
change
sheets
for
information
concerning
modifications.
3.
EQUIPMENT
REQUIRED
FOR
MECHANICAL
MEASUREMENT
oo
SPRING
SCALE:
0v3kg
(008
lbs)
0%300¢
(010
oz)
TEST
TAPE:
TEAC
YTT-2004
(15
ips).
TEAC
YTT-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
:
Xe
5
ze
7
TEAC
VEST
TAPE
Spring
Scale
TEAC
Hex
Allen
Wrench
TEAC
Test
Tapes
FOR
ELECTRICAL
MEASUREMENT
TEST
TAPE:
TEAC
YTT-1004
for
15ips
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
BAND
PASS
FILTER:
TEAC
M-206A
(1kHz)
VTVM:
hp
model
4302B
or
equivalent
RESISTOR:
Non
inductive
type
8
ohm/1W
OSCILLOSCOPE:
General
purpose
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(O
dB
=
0.775
V).
Characteristics
of
this
test
set
are
similar
to
the
standard
VU-meter.
TEAC
Test
Set
REMOVING
THE
REAR
PANEL
AND
WOODEN
SIDES
1.
Loosen
the
four
screws
on
each
wooden
side.
2.
Remove
the
six
screws
holding
the
rear
panel.
3.
Lift
off
rear
panel.
4,
Remove
the
eight
screws
in
the
two
wooden
sides.
5.
Remove
the
wooden
sides.
D-0379
Fig.
4-1
Removing
Wooden
Sides
REMOVING
THE
BOTTOM
PLATE
1.
Place
the
unit
upside
down.
2.
Remove
the
three
screws
in
the
bottom
plate.
3.
Lift
off
bottom
plate.
0-0380
Fig.
4-2
Removing
Rear
Panel
and
Bottom
Plate
*A11
amplifier
checks
and
adjustments
can
be
made
from
the
bottom
with
the
plate
removed.
;
‘CAUTION
These
adjustments
should
be
performed
by
experienced
technicians,
and
then
only
when
going
through
the
complete
test
and
check
pro-
cedures
on
the
unit
which
is
being
tested.
HEAD
REPLACEMENT
CAUTION
Power
to
the
unit
must
be
switched
off
when
removing
the
heads,
this
will
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-3300/3340.can
be
changed
either
as
a
complete
assembly
or
individually
as
required.
HEAD
ASSEMBLY
REPLACEMENT
To
change
the
head
assembly
as
a
unit,
remove
the
two
mounting
screws,
(one
on
each
end).
Note
the
positions
of
the
wires
on
the
circuit
board
before
unsoldering.
Solder
the
wires
of
the
new
assembly
in
exactly
the
same
positions.
Fig.
4-3
Head
Assy
INDIVIDUAL
HEAD
REPLACEMENT
To
replace
a
single
head,
a
special
2mm
:
on
*
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
tape.
Fig.
4-4
Individual
Heads
REMOVAL
OF
CAPSTAN
MOTOR
_1.
Remove
the
three
screws
hold-
ing
the
capstan
motor
(top).
2.
Unsolder
the
six
wire
connect-
ing
the
capstan
motor.
3.
Remove
the
four
screws
holding
the
capstan
motor
(bottom).
4.
Loosen
the
two
set
screws
(hex
head)
in
pulley
and
lift
off
pulley.
UY
REMOVAL
OF
CAPSTAN
ASSY
NOTE
A
clearance
of
0.01"
must
main-
tained
between
the
flywheel
and
capstan
assembly.
1.
Unscrew
capstan
cover
(front
panel).
2.
Remove
two
screws
from
rear
bracket,
allow
bracket
to
drop
toward
floor
of
case.
.
Remove
capstan
belt.
.
Loosen
two
screws
in
capstan
assy
flywheel.
Remove
flywheel.
5.
Remove
three
screws
in
capstan
assy.
6.
Gently
move
capstan
assy
up
and
down
until
it
slides
out
of
panel.
ewe
Fig.
4-7
Capstan
Assy
Removal
REMOVAL
OF:
TENSION
ARMS
LEFT
&
RIGHT?
———2———_—___-——_
See
illustration
for
complete
disassembly
instructions.
REMOVAL
OF:
REEL
MOTOR
ASSY
1.
Loosen
2
hex
screws
in
brake
drum,
lift
off
brake
drum.
2.
Remove
3
screws
securing
the
brake
assembly
to
the
motor.
3.
Remove
reel
turntable,
remove
4
screws
securing
motor
to
front
panel.
NOTE
Reel
motor
assemblies
are
mirror
images
of
each
other,
these
assemblies
are
not
interchangeable.
Fig.
4-8
Reel
Motor
Removal
5.HEAD
ALIGNMENT
—MECHANICAL—
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.
PLAYBACK
HEAD
The
pole
of
the
playback
head
should
be
even
with
the
top
of
a
threaded
tape.
ORANGE
47.
4
Channel
A-3340
only
Fig.
5-1
Head
Alignment
Adjustable
Screws
NOTE
Azimuth
adjustments
are
given
in
the
section
on
MEASUREMENTS
AND
ADJUSTMENTS
—ELECTRICAL~
TAPE
TRANSPORT
PARTS
LOCATION
A-3300/3340
REAR
VOLTAGE
AND
FREQUENCY
CONVERS
ION---WHWHHHWHWHH,}W,-W_,_|__—_—_———————
Unit
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
60
Hz.
No
frequency
conversion
is
required.
If
it
should
be
necessary
to
convert
the
A-3340/A~-3300
deck
to
operate
from
a
power
source
of
different
voltage
or
frequency,
it
may
be
easily
accomplished
as
follows:
:
Voltage
Conversion:
The
A-3340/A-3300
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
cut-
out.
Reinstall
the
fuse.
o-0862
Frequency
Conversion:
1.
Remove
the
power
cord
and
all
’
connecting
cables.
2.
Take
off
tape
deck
rear
cover
by
removing
the
six
screws
holding
it.
3.
The
belt
linking
the
motor
pulley
and
flywheel
must
be
repositioned.
The
motor
pulley
on
the
Model
A-3340/A-3300
has
two
steps
and
difference
in
rotation
due
to
a
different
power
frequency
is
com-
pensated
for
by
changing
the
belt
step
on
the
pulley.
Reposition
the
belt
with
your
fin-
gers,
at
the
flywheel
first
and
then
at
the
pulley
when
switching
from
60
Hz
to
50
Hz
or
the
pulley
first
and
then
the
flywheel
when
changing
from
50
Hz
to
60
Hz.
4.
After
repositioning
belt,
rotate
the
flywheel
several
turns
with
your
finger
to
make
sure
the
belt
is
correctly
seated
on
the
steps.
5.
The
frequency
selector
inside
the
tape
deck
must
be
switched
to
the
:
frequency
of
the
power
line.
Fig.
6-8
Frequnecy
Conversion
6.
Reinstall
the
rear
cover
of
tape
deck.
r)
®
nm
?.
4
CAPSTAN
FLYWHELL
Ss.
MEASUREMENT
AND
ADJUSTMENT
-«MECHANICAL-
The
TEAC
A-3340/3300,
-10-11-12
have
a
highly
reliable
three
motor
drive
system
and
should
require
a
minimum
of
mechanical
maintenance
or
adjustment.
These
adjustments
are
made
at
the
factory.
Readjustment
should
only
be
required
after
many
hours
of
operation
or
component
re~
placement.
The
following
chart
lists
the
differences
by
number
A-3300,
~10,-11,-12
and
A-3340.
TAPE
SPEED
HEAD
CONFIGURATION
4T
AT
4T
2
Channel
A-3300-10
|
7-1/2ips,
3-3/4ips
A-3340
. 5
4T
4T 4T
4
Channel
A-3300-11
|
lips»
7-1/2ips
QT
oT
2T
Half
Track
A-3300-12
|
7-1/2ips,
3-3/4ips
|
2T
ot
2T
Half
Track
3%
(90mm)
20%
0%
ft
re
20
r
32
%e
19%
29,
-
(622mm)
(498ma)|
(32@mm)
(508mm,
6%
(410mm)
o-0636
1754
M
td
(70mm)
-
(440mm)
A-3300
-
et,
75g
Sse
i
9401mm)
(415m)
FH
,
.
ies
6
j
eg
|
(73mm)
o-0678
(440mm
Dimensions
PINCH
ROLLER
PRESSURE
———----——___--__"-
wm
NOTE
Pinch
roller
pressure
is
supplied
by
the
pinch
roller
spring
arm
and
it
is
most
important
that
the
solenoid
plunger
be
fully
bottomed
before
taking
pressure
measurement.
Procedure
For
Check
And
Adjustment
Load
tape
or
block
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
(
P
),
and
holding
the
spring
scale
as
illustrated,
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
2.1.2.3
kg.
Optimum
value
is
2.2
kg.
If
adjustment
is
necessary,
loosen
the
three
screws
on
the
cap-
stan
solenoid
and
position
the
solenoid
for
optimum
pressure.
Adjust
solenoid
limit
position
so
that
the
GAP
between
capstan
shaft
and
pinch
roller
is
approximately
7mm
when
solenoid
is
not
actuated.
Limit
is
adjusted
by
loosening
the
mounting
screw
(A),
mount
slot
is
elongated,
slide
limit
until
proper
gap
is
obtained.
CAPSTAN
PINCHROLLER
D-II-13
Fig.
6-1
Pressure
Measurement
-Pinch
Roller-
TORQUE
MEASUREMENT
PROCEDURE
Supply
and
take
up
motor
torques
should
be
within
the
limits
listed
in
the
chart
below.
BACK
TENSION
3007320
g-cm
A-3300-10,
12
TAKE
UP
TORQUE
780820
g-cm
ADJUSTMENT
LARGE
380.400
g-cm
180.210
g-cm
A-3340/A-3300-11
TAKE
UP
TORQUE
BACK
TENSION
880920
g-cm
300%320
g~cm
380%400
g-cm
170%200
g-cm
R-1
SMALL
reel
torque
(for
both)
R-2
LARGE
reel
torque
(for
both)
R-3
LARGE
reel
torque
(balance)
R-4
REWIND
BACK
TENSION
(fixed)
R-5
BRAKE
SOLENOID
(fixed)
o-0679
Fig.
6-2
Adjustment
Tension
Resistors
Procedure
For
Check
And
Adjustment
TAKE
UP
TORQUE
1.
Block
the
shut-off
arm
in
the
on
position
and
place
REEL
size
switch
to
LARGE
position.
2.
Place
an
empty
reel
(RE-701)
and
spring
scale
on
right
reel
table.
3.
Depress
the
(
p
)
play
button.
Allow
the
rotation
of
the
reel
to
slowly
draw
the
scale
toward
the
hub.
4.
The
spring
scale
should
be
780820
g-cm.
5.
If
it
is
not
adjust
resistor
R-2
until
a
scale
reading
within
the
specified
limits.
6.
After
adjusting
R-2,
check
back
tension
of
left
reel
motor,
pro-
cedure
as
follows.
BACK
TENSION
7.
Place
the
empty
reel
and
spring
scale
on
the
left
reel
table.
And
depress
the
(
p
)
play
button.
8.
Pull
the
scale
away
from
the
reel
against
the
motor
torque
(ro-
tation),
with
a
steady
smooth
motion.
9.
The
scale
should
be
3001320
g-cm.
Adjust
R-3,
if
checked
value
of
back
tension
exceeds
the
specified
limits.
10.
After
adjusting
R-3,
adjust
R-2
to
bring
back
tension
and
take
‘up
torque
to
exact
specified
limits.
NOTE
Adjustments
will
interact,
several
adjustments
may
be
required
to
bring
both
motors
within
specification.
11.
After
adjusting
R-2 and
R-3
repeat
above
procedure.
When
the
REEL
switch
is
in
the
SMALL
position,
the
scale
reading
should
be
within
the
limits
listed
in
the
chart.
If
adjustment
is
re-
quired
adjust
the
resistor
R-l.
BACK
TENSION:
TAKE
UP
TORQUE
.
TAKE
UP
TORQUE:
BACK
TENSION.
TEAC
TEAC
RE-701
RE-701
Fig.
6-3
Torque
Measurement
BRAKE
TORQUE
—————
NOTE
The
brake
torque
is
actuated
mechanically.
Pressure
is
set
by
the
variable
spring
force.
While
making
this
measurement
and
adjustment,
be
careful
not
to
bend
the
brake
bands.
As
brake
torque
will
change
with
cleaning,
brake
drums
and
brake
shoes
should
be
cleaned
only
when
absolutely
necessary.
If
cleaning
is
required,
use
TEAC
cleaner
TZ-251B
only.
After
cleaning
operate
the
machine
for
some
time
before
performing
the
below
procedures.
Brake
adjustments
are
made
with
no
power
connected
to
the
equipment.
procedure
for
check
and
adjustment
1.
Place
an
empty
2"
hub
reel
on
the
left
reel
table,
and
fasten
one
end
of
a
30"
length
of
string
to
the
reel
anchor.
2.
Wind
several
turns
of
string
counterclockwise
around
the
hub
and
attach
a
suitable
spring
scale
to
the
free
end
of
the
string.
Slowly
draw
the
spring
scale
away
from
the
reel,
making
sure
that
the
string
does
not
rub
against
the
reel
flanges.
3.
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.
4,
The
reading
should
be
1.8
kg-cm
+0.1(25
oz-inch).
5.
If
different,
brake
torque
will
normally
be
adjusted
by
means
of
the
A
&
B
adjustment
screws,
loosen
locking
screw
C,
adjust
A
&
B
for
proper
torque
value,
retighten
screw
C.
NOTE
The
difference
in
readings
between
the
right
and
left
brakes
should
be
kept
within
50
g-cm
(0.7
oz-inch).
Fig.
6-4
Torque
Measurement
&
Adjustment
Location
-Brake-
REEL
HEIGHT
ADJUSTMENT
Reel.
height
adjustment
is
required
only
if
a
motor
has
been
replaced.
Adjustment
is
accomplished
by
loosening
the
two set
screws
in
the
reel
turntable
collar.
Reel
turntable
height
should
be
adjusted
using
standard
7"
reels,
if
10"
reels
are
used
place
a
TEAC
reel
height
ad-
justing
sheet
on
each
reel
turntable.
With
a
tape
threaded
on
the
machine,
position
the
reel
height
for
smooth
tape
travel.
Retighten
set
screws.
*
Reel
turntable,
if
damaged
should
be
replaced
as
a
unit
available
only
as
a
complete
assembly.
:
Fig.
6-5
Reel
ad
Height
Adjustment
FLUTTER
Flutter
should
be
measured
in
playback
mode
using
a
TEAC
flutter
free
tape
YTT-2004-2003:2002
and
a
Sentinel
Inc
model
FL~3D-1
flutter
meter.
Measurement
of
flutter
should
be
made
in
accordance
with
NAB
standards.
Values
obtained
with
different
standards
or
equipment
cannot
be
compared.
Flutter
should
not
exceed.
15ips:
0.15%
7-1/2ips:
0.20%
3-3/4ips:
0.25%
These
figures
apply
to
any
tape
position
and
direction(such
as
full
take-up
reel,
full
supply
reelor
about
mid
point).
TAPE
SPEED
The
tape
speed
should
be
measured
using
TEAC
flutter
free
tape,
model
YTT~2003+2002.
These
tapes
contain
a
highly
accurate
3
kHz
tone.
Connect
a
digital
frequency
counter
to
either
line
LINE
OUT
jack.
The
indicated
frequency
should
be
3
:
*
oy
kHz
0.7%
for
all
speeds.
Fig.
6-6
Test
Equipment
Set-Up
Flutter
And
Tape
Speed
FLUTTER
FREE TAPE
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,
unless
otherwise
indicated,
are
for
the
left
channel
at
a
tape
speed
of
7-1/2ips.
The
same
procedures
are
to
be
applied
to
the
right
channel
and
again
for
both
channels
at
3-3/4ips
and
or
15
ips.
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
to
left
channel/right
channel.
L
CHANNEL
~A-3300/3340-
Fig.
7-1
Adjustment
Locations
Only
FRONT
adjustments
are
illustrated,
REAR
adjustments
are
identical.
LOCATION
PLAYBACK
EQ.
VR201
VR202
PLAYBACK
LEVEL
PLAYBACK
METER
LEVEL
VR303
REC
METER
LEVEL
VR301
SOURCE
MONITOR
LEVEL
L
301
REC
EQ.
L
302
BIAS
TRAP
vC401
BIAS
NORMAL
ADJ.
vc402
BIAS
HIGH
ADJ.
62
FWD
wt
Rune
82
y
fe)
~
PLAYBACK
HEAD
AZIMUTH
ADJUSTMENT
PLAYBACK
PERFORMANCE
arf4e—w—[
>]
Q307/308
Qioi/i04
Quo306
yo
2iv
va
MONITOR
Q202/;
23V
7
Q201/204
Fig.
7-2
Simplified
Diagram
-Playback-
Coarse
Adjustment
PWN
E
Connect
a
level
meter
to
either
OUTPUT
jack.
Thread
a
TEAC
test
tape
YIT-1003
on
the
unit.
.
Play
the
15
kHz
test
tone
in
section
2
of
the
test
tape.
Slowly
rotate
the
azimuth
screw
until
maximum
indication
is
obtain
on
the
level
meter.
NOTE
If
during
playback,
a
slight
pressure
on
the
heads
results
in
a
vise
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.
It
is
absolutely
essential
to
accomplish
the
coarse
adjustment
before
using
this
method
to
avoid
phase
errors
larger
than
45°
Connect
the
test
equipment
as
shown
in
Fig.
7-8.
Play
a
10
kHz
signal
and
adjust
the
azimuth
screw
until
the
oscil-
loscope
shows
that
the
signals
are
less
than
45°
in
phase.
Secure
the
screw
with
a
drop
of
LOCTITE.
This manual suits for next models
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