Teac A-3300SR User manual
A-3300SR
A-2300SR
Stereo
Tape
Deck
TEAC
CORPORATION
51032220
1.
GENERAL
DESCRIPTION
The
TEAC
A-3300/A-2300
series
tape
decks
have
earned
an
enviable
reputation
for
quality
since
their
first
introduction
years
ago.
Over
the
years
various
design
improvements
have
been
incorpo-
rated
in
the
basic
model
to
keep
these
decks
abreast
of
the
advances
in
tape
technology
and
to
fulfill
the
needs
of
our
growing
range
of
knowlegeable
customers.
The
A-3300S/A-2300S
and
A-3300SX/A-2300SX
followed,
building
on
the
tested
and
proven
reliability
of
the
original
models
and
offering
ever
increasing
versatility
and
user
satisfaction.
Now
TEAC
introduces
the
new
A-3300SR/A-2300SR
which
have
the
added
capability
of
reverse
playback
together
with
several
sophisticated
circuit
improvements
to
keep
these
new
models
at
State-of-the-art
reliability.
The
basic
design
of
the
A-3300SR/A-23008R
is
highly
similar
to
that
of
the
A-3300SX/A-2300SX,
therefore,
information
in
this
manual
may
be
applied
to
the
A-3300SX/A-2300SX
also.
A-3300SR
A-2300SR
—
TABLE
OF
CONTENTS
—
1.
GENERAL
DESCRIPTION
.............0-.
3
2.
SPECIFICATIONS
AND
SERVICE
DATA
......
4
3.
TOOLS
FOR
TESTING
AND
MAINTENANCE
...
6
4.
PARTIAL
DIS-ASSEMBLY
.............---
7
5.
TAPE
TRANSPORT
PARTS
LOCATION
.......
9
6.
HEAD
REPLACEMENT
AND
ALIGNMENT
.....
10
—
MECHANICAL
—
7.
MEASUREMENT
AND
ADJUSTMENT
........
11
—
MECHANICAL
—
8.
MEASUREMENT
AND
ADJUSTMENT
........
14
—
ELECTRICAL
—
9.
SERVICING
AND
MAINTENANCE
..........
21
10.
SIMPLIFIED
SCHEMATIC
WITH
LEVEL
INDICATIONS
........-.
02200
e
ee
reese
22
2.
SPECIFICATIONS
AND
SERVICE
DATA
2-1
A-3300SR
Track
System
Heads
Reel
Size
Tape
Speed
Motors
Inputs
(Level
and
Impedance)
Outputs
(Level
and
Load
Impedance).
Playback
Equalization
Bias
Frequency
Power
Requirement
Power
Consumption
Weight
Dimensions
(WHD)
1/4
track
2
channel
stereophonic
1/4
track
1
channel
monophonic
Three;
Erase,
Record
and
Forward/Reverse
Playback
10-1/2"
and
7”
7-1/2
ips
and
3-3/4
ips
1
Dual-Speed
Hysteresis
Synchronous
Capstan
Motor
2
Eddy
Current
Induction
Reel
Motors
MIC:
Specified;
—60
dB
(0.774
mV)/10k
ohms
Minimum;
—70
dB
(0.244
mV)
LINE:
Specified;
—8
dB
(308
mV)/50k
ohms
Minimum;
—18
dB
(97
mV)
HEADPHONE:
—24
dB
(49
mV)/8
ohms
LINE:
Specified;
—8 dB
(308
mV)/10k
ohms
Maximum;
—2
dB
(615
mV)
7-1/2
ips:
NAB
3180
ys,
50
us
3-3/4
ips:
NAB
3180
us,
90
us
100k
Hz
(+5k
Hz,
push-pull
oscillator)
100,
117,
220,
240
V
AC
50/60
Hz
(General
Export
Model)
117
V
AC
60
Hz
(U.S.A.
and
Canada
Model)
143
W
21
kg
(46
Ibs)
net
440
x
440
x
210
mm
(17-5/16"
x
17-5/16”
x
8-1/4")
2-2
SERVICE
DATA
—MECHANICAL—
Tape
Speed
Deviation
and
Drift
Wow
and
Flutter
Pinch
Roller
Pressure
Reel
Torque
3,000
Hz
+30
Hz,
within
15
Hz
Playback:
Both
Direction,
0.18%
(RMS)
at
7-1/2
ips
0.20%
(RMS)
at
3-3/4
ips
Overall:
0.20%
(RMS)
at
7-1/2
ips
0.25%
(RMS)
at
3-3/4
ips
2.1
kg
(4.6
lbs)
|
DIRECTION
|
REEL
SIZE
TAKE-UP
VALUES
BACK
TENSION
VALUES
FWD
LARGE
790
to
870
g-cm
(11
to
12
oz-inch)
280
to
360
g-cm
(4
to
5
oz-inch)
SMALL
370
to
410
g-cm
(5
to
6
oz-inch)
175
to
215
g-cm
(2.4
to
3
oz-inch)
REV
LARGE
1000
to
1100
g-cm
(14
to
15
oz-inch)
|
320
to
400
g-cm
(4.5
to
5.6
oz-inch)
SMALL
500
to
550
g-cm
(7
to
8
oz-inch)
185
to
225
g-cm
(2.6
to
3
oz-inch)
Brake
Torque
1,600
to
2,000
g-cm
(22
to
28
oz-inch)
F.F/REW
Time
Refer
to
Section
2-5
for
Electrical
Service
Data
applicable
to
both
models.
140
seconds
for
1,800
foot
tape
NOTE:
Asa
result
of
continuing
change
and
improvements
during
the
production
run,
minor
differences
may
be
found
between
early
and
later
machines.
Value
of
“dB”
in
this
manual
refer
to
0
dB
=
0.775
V.
2-3
A-2300SR
Track
System
Heads
Reel
Size
Tape
Speed
Motors
Inputs
(Level
and
Impedance)
Outputs
(Level
and
Load
Impedance)
Playback
Equalization
Bias
Frequency
Power
Requirement
Power
Consumption
Weight
Dimensions
(WHD)
1/4
track
2
channel
stereophonic
1/4
track
1
channel
monophonic
Three
;
Erase,
Record
and
Forward/Reverse
Playback
qe
7-1/2
ips
and
3-3/4
ips
1
Dual-Speed
Hysteresis
Synchronous
Capstan
motor
2
Eddy
Current
Induction
reel
motors
MIC:
Specified;
—60
dB
(0.774
mV)/10k
ohms
Minimum;
—70
dB
(0.244
mV)
LINE:
Specified;
—8
dB
(308
mV)/50k
ohms
Minimum;
—18
dB
(97
mV)
HEADPHONE:
—24
dB
(49
mV)/8
ohms
LINE:
Specified;
—8
dB
(308
mV)/10k
ohms
Maximum;
—2
dB
(615
mV)
7-1/2
ips:
NAB
3180
us,
50
us
3-3/4
ips:
NAB
3180
us,
90
ps
100k
Hz
(+5k
Hz,
push-pull
oscillator)
100,
117,
220,
240
V
AC
50/60
Hz
(General
Export
Model)
117
V
AC
60
Hz
(U.S.A,
and
Canada
Model)
120
W
19
kg
(42
Ibs)
net
440
x
392
x
210
mm
(17-5/16”
x
15-7/16”
x
8-1/4")
2-4
SERVICE
DATA
—MECHANICAL—
Tape
Speed
Deviation
and
Drift
Wow
and
Flutter
Pinch
Roller
Pressure
Reel
Torque
Brake
Torque
Fast
Forward/Rewind
Time
3,000
+30
Hz,
within
15
Hz
Playback:
0.18%
(RMS)
at
7-1/2
ips
0.20%
(RMS)
at
3-3/4
ips
Overall:
0.20%
(RMS)
at
7-1/2
ips
0.25%
(RMS)
at
3-3/4
ips
2.1
kg
(4.6
Ibs)
|
DIRECTION
|
TAKE-UP
VALUES
|
BACK
TENSION
VALUES
370
to
410
g-cm
175
to
215
g-cm
(5
to
5.6
oz-inch)
(2.4
to
3
oz-inch)
500
to
540
g-cm
185
to
225
g-cm
(7
to
8
oz-inch)
(2.6
to
3
oz-inch)
800
to
1,200
g-cm
(11
to
17
oz-inch)
140
seconds
for
1,800
foot
tape
FWD
REV
2-5
SERVICE
DATA
—ELECTRICAL—
(both
models)
Frequency
Response
Signal-to-noise
Ratio
Erase
Efficiency
Crosstalk
Rejection
Total
Harmonic
Distortion
Refer
to
Frequency
Response
Limits
chart
in
this
manual
Overall:
47
dB
or
higher
at
7-1/2
ips
45
dB
or
higher
at
3-3/4
ips
68
dB
or
more
at
1k
Hz
(Measured
with
input
10
dB
higher
than
the
specified
input
level)
40
dB
or
more,
adjacent
track
at
125
Hz
50
dB
or
more,
channel
to
channel
at
1k
Hz
Overall:
1.0%
or
less
at
1k
Hz
signal
at
O
VU
DIMENSIONS
A-3300SR
A-2300SR
|
367mm
3,
7
1496)
US
6668866
410mm
ve
wae
ave
use)
(440mm)
(210mm)
440mm
754g)
16’
(4omm?
3.
TOOLS
FOR
TESTING
AND
MAINTENANCE
A
minimum
of
the
following
tools
and
test
instruments
are
required
for
measuring
and
adjusting
to
obtain
optimum
performance.
Regular
maintenance
tools
will
be
adequate
for
those
not
listed
here.
If
any
test
instrument
listed
here
is
not
available,
a
close
equivalent
can
be
used.
WOW
AND
FLUTTER
METER........
Meguro
Denpa
Sokki
K.K.,
Model
MK-668C
or
D
&
R
Co.,
Model
FL-4B
AC
VTVM
8c
68
bg
ew
arene
hsena
a
geok
6
Hewlett-Packard
Co.,
Model
400E
(0.1
mV
—300V)
DIGITAL
FREQUENCY
COUNTER
....
Range;
10
Hz
—
100
kHz
BAND-PASS
FILTER
..............
1
kHz
narrow
band-pass
type
OSCILLOSCOPE
.............--.--
General
Purpose
AF
OSCILLATOR
...........-.565
10
Hz
—
100
kHz
ATTENUATOR
............-00065
General
Purpose
DISTORTION
ANALYZER
..........
Basic
Freq.
400
Hz/1
kHz
TOOLS
Siyipeca
eh
&
sees
eset
s
Becianane
ters
aloe
Spring
scale;
O—4
kg
(O—8
Ibs)
O—1
kg
(0—2.2
lbs)
Hex
head
Allen
Wrench,
Plastic
alignment
tool,
Load
resistor
non-inductive
type
8
ohm/1
W
HEAD
DEMAGNETIZER
...........
TEAC
E-3
or
equivalent
TEAC
TEST
TAPE
.............-..--
YTT-1002
(3-3/4
ips),
YTT-1003
(7-1/2
ips)
for
Playback
Alignment
test,
YTT-8013
and
YTT-8023
for
Recording
test,
YTT-2002
(3-3/4
ips),
YTT-2003
(7-1/2
ips)
for
Tape
Speed
and
Wow/Flutter
test
TEAC
EMPTY
REEL
..........-.-.-.-
RE-702
(2.5"
dia.
hub),
RE-701
(4”
dia.
hub)
4.
PARTIAL
DIS-ASSEMBLY
4-1
REMOVING
WOODEN
SIDES
meal
pe
®
AND
REAR
PANEL
:
See
illustration
for
complete
dis-assembly
instructions.
Most
amplifier
checks
and
adjustments
can
be
made
from
the
bottom
with
the
(bottom)
panel
removed.
These
adjustments
should
be
performed
by
experienced
technicians,
and
then
only
when
going
through
the
com-
plete
test
and
check
procedures
on
the
unit
which
is
being
tested.
:
=
Fig.
4-2
Head
Ass’y
Removal
Ny
tg
iy
elit
My
ig
Mi
ti
4-3
REMOVAL
OF
CAPSTAN
MOTOR
1.
Remove
the
3
screws
(a)
holding
the
capstan
motor
Plate.
2.
Unsolder
the
6
wires
connecting
the
capstan
motor.
3.
Remove
the
4
screws
holding
the
capstan
motor
to
the
motor
plate.
Watch
for
the
Rubber
Cushions.
4.
Loosen
the
2
set
screws
(hex
head)
in
pulley
and
lift
off
io
pulley.
Loosen
2
set
screws
in
fan
and
remove
fan.
“eo
NOTE:
USA,
CANADA
versions
of
the
A-3300SR/
222
sl:
A-2300SR
have
a
different
pulley
than
that
shown
eo
222
|
%@
and
have
no
Frequency
Selector
switch.
See
page
|
Noiee2
13,
Section
VOLTAGE
AND
“FREQUENCY
rir
22g
|
CONVERSION.
Fy
Fig.
4-1
Removing
Wooden
Sides
and
Rear
and
Bottom
Panels
4-2
HEAD
ASSEMBLY
REMOVAL
To
change
the
head
assembly
as
a
unit,
.
Note
the
positions
of
the
wires
on
the
circuit
board.
.
Unsolder
the
wires.
.
Remove
the
2
mounting
screws,
replace
the
assembly.
.
Solder
the
wires
of
the
new
assembly
in
exactly
the
same
positions.
ae
Frquency
selector
SW
(EX
model
only)
BRWHN
NOTE:
See
page
10,
HEAD
REPLACEMENT
AND
ALIGN-
MENT
Section
for
more
detailed
explanation.
Fig.
4.3
Capstan
Motor
Removal
4-4
REMOVAL
OF
CAPSTAN
ASSEMBLY
A-3300SR
A-2300SR
1.
Unscrew
dust
cap
(front
panel).
2.
Remove
2
screws
from
rear
bracket.
Allow
bracket
to
drop
toward
floor
of
case.
.
Remove
capstan
belt.
.
Loosen
2
screws
in
flywheel.
Remove
flywheel.
.
Remove
3
screws
in
capstan
ass’y.
.
Gently
move
capstan
ass’y
up
and
down
until
it
slides
out
of
panel.
Nm
W
NOTE:
When
replacing
flywheel,
position
flywheel
on
capstan
ass’y
shaft
so
that
end
of
shaft
protrudes
slightly
from
rear
of
flywheel.
A
clearance
of
ap-
prox.
0.01”
must
be
maintained
between
the
end
of
the
capstan
shaft
and
the
rear
bracket.
Rear
Bracket
Flywheel
Fig.
4-5
Reel
Motors
Removal
ii
4-6
REMOVAL
OF
TENSION
ARMS
LEFT
AND
RIGHT
See
illustration
for
complete
dis-assembly
instructions.
IMPORTANT:
After
re-assembly
check
clearance
to
ascer-
tain
that
arm
moves
freely
and
is
not
binding.
Capstan
Ass’y
CAUTION:
Do
not
over-tighten
screws
holding
micro-
=
switches.
Dust
Cap
Insulating
spacer
and
micro-switches
are
easily
broken
by
€Xcess
pressure.
Fig.
4-4
Capstan
Ass‘y
Removal
4-5
REMOVAL
OF
REEL
MOTOR
mae
vo
1.
Disconnect
the
4
motor
wires
from
terminals
and
release
wire
harness
straps.
2.
Loosen
2
set
screws
(hex
head)
in
Brake
drum(A)
and
2
in
the
Reel
Turntable
assembly(F).
Lift
off
these
parts.
<>
Tnsulating
3.
Remove
4
screws
securing
the
Brake
Assembly(D)
to
the
motor.
Carefully
lift
off
the
Brake
Retainer(B).
Do
not
remove
wires
connected
to
the
brake
solenoid(C)
or
as
micro
switch.
2
|
4.
Remove
4
screws
securing
Reel
Motor(E)
to
chassis
83
&
through
the
front
panel.
=
Fig.
4-6
Tension
Arms
Removal
5.
TAPE
TRANSPORT
PARTS
LOCATION
REAR
VIEW
Control:
Relay
A-3300SR
P.C
Board
Fuse
P.C
Board
R3
R1
R2
nee
=
a
_
Neen.
a
*
Power
-
ar
a
if
-=s
zi
i]
Transformer
Right
’
I5¥F\"
i
m
=
Left
Reel
Motor
G
@
.
:
pt
4
Reel
Motor
Reel
C41
Motor
P.C
Board
Capstan
Motor
c40
Capstan
Freq.
Selector
SW
Flywheel
Power
Supply
P.C
Board
Head
Selector
P.C
Board
Voltage
Selector
Plug
(for
General
Export
Model)
A-2300SR
C42
Power
Transformer
:
Control
Relay
C4l
P.C
Board
Left
Reel
Motor
Right
R3
Reel
Motor
Capstan—.
Motor
—R?2
Reel
C40
Motor
i
P.C.
Board
Freq.Selector
SW
Capstan
Power
Supply
Belt
P.C
Board
Capstan
’
Head
Select
Flywheel
o
P.C
Board
Voltage
Selector
Plug
(for
General
Export
Model)
NOTE:
Refer
to
page
12
for
the
TORQUE
MEASUREMENT
procedure.
For
ordering
parts,
refer
to
the
exploded
view
in
the
PARTS
LIST.
An
accompa-
nying
listing
provides
the
correct
parts
numbers.
6.
HEAD
REPLACEMENT
AND
ALIGNMENT
—
MECHANICAL
—
6-1
HEAD
REPLACEMENT
AND
WIRING
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
manner.
Replace
the
nuts
securing
the
new
head
to
the
plate.
Perform
head
alignment
before
operation.
as)
Se
ca-—
Nuts
(A)
Spacer
>
oa
‘O
|
Playback
_-/”
Head
only
Ele
|
—[s
Shield
Fig.
6-1
Head
Replacement
ss
PLAYBACK
HEAD
RECORD
HEAD
ERASE
HEAD
T
TARA
NAVA
>
fFfa®
Zou
Zz
ase?
55S
$
GB
L_ewo
etl
rev
«
Fig.
6-2
Head
Wiring
—Rear
View—
6-2
HEAD
ADJ.
SCREWS
AND
NUTS
-
®
Azimuth
adj.
screws
©
>
Height
and
Tilt
adj.
screws
©
Tangency
adj.
Nuts
T-H135
Fig.
6-3
Head
Adjustment
Screns
end
Nuts
6-3
VISUAL
HEAD
ALIGNMENT
Since
head
alignment
critically
affects
the
frequency
re-
sponse
on
both
playback
and
recording,
the
head
alignment
should
be
done
carefully.
The
head
can
be
adjusted
in
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
TIED
4.5
esses
ee
Bh
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
re-
aligned
according
to
electrical
head
algmment
paragraph
which
follows
in
this
Service
Manual.
7-4
MIS-ALIGNMENT
OF
THE
HEADS
HEIGHT
(view
from
front
of
head)
AZIMUTH
‘view
from
front
of
head?
Adjust
by
©
Nuts
Adjust
by
@
Screws
Fig.
6-4
Head
Mis-Alignment
—
Examples
—
Capstan
Shaft
7.
MEASUREMENT
AND
ADJUSTMENT
—
MECHANICAL
—
7-1
PINCH
ROLLER
PRESSURE
NOTE:
Pinch
roller
pressure
is
supplied
by
the
pinch
roller
spring
arm
and
it is
most
important
that
the
sole-
noid
plunger
be
fully
bottomed
before
taking
pres-
sure
measurement.
.
Load
tape
or
block
the
shut-off
arm
in
the
ON
position.
.
Attach
a
suitable
spring
scale
to
the
pirich
roller
shaft.
.
Place
the
unit
in
the
PLAY
mode
(>
),
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
2.0
to
2.2
kg
(4.4
to
5.0
lbs.)
.
If
adjustment
is
necessary,
loosen
the
3
screws
on
the
capstan
solenoid
and
position
the
solenoid
for
optimum
pressure.
.
Adjust
solenoid-limit
position
so
that
the
gap
between
capstan
shaft
and
pinch
roller
is
approx.
7mm
when
solenoid
is
not
actuated.
Also
make
sure
pinch
roller
shaft
does
not
contact
spring
arm
(B).
Limit
is
adjusted
by
loosening
the
mounting
screw
(A),
then
sliding
limit
until
proper
position
is
obtained.
Mounting
Screws
(A)
Capstan
Solenoid
Reposition
Solenoid
to
Obtain
Optimum
Pressure
Pinch
Roller
Spring
Scale
T-1134
Fig.
7-1
Pressure
Measurement
and
Adj.
Locations
7-2,
BRAKE
TORQUE
The
brake
torque
is
actuated
mechanically.
Pressure
is
set
by
the
variable
spring
force.
While
making
these
measure-
ments
and
adjustments,
be
careful
not
to
bend
the
brake
bands.
As
brake
torque
will
change
with
cleaning,
brake
drums
should
be
cleaned
only
when
absolutely
necessary.
If
cleaning
is
required,
use
TEAC
cleaner
TZ-261A.
After
cleaning,
operate
the
brakes
by
depressing
the
play
and
STOP
buttons
several
times
to
completely
dry
out
the
brakes
before
performing
the
following
procedure.
NOTE:
Brake
adjustments
are
made
with
NO
power
connected
to
the
equipment.
1.
Place
an
empty
large
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
and
pull
on
scale
until
reel
begins
to
turn.
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
(Calculated
value)
should
be
1800
g-cm
+200
g-cm
(22
to
28
oz-in).
1000
g-cm
+200
g-cm
(11
to
17
oz-inch)
for
A-2300
SR
5.
If
adjustment
is
required,
loosen
the
3
screws
shown
and
position
the
brake
for
optimum
torque.
6.
The
adjustment
of
the
right
brake
is
the
same,
with
the
exception
that
rotations
are
clockwise.
(wind
string
CLOCKWISE
around
reel
hub)
7.
See
note
at
the
top
of
page
12
for
explanation
of
torque
measurements.
Brake
Band
Space
Adi.
T-1133
Fig.
7-2
Torque
Measurement
and
Adjustment
LOcation
Brake
Torque
Adj.
Screws
12
TORQUE
MEASUREMENT
PROCEDURE
NOTE:
The
following
torque
measurements
should
be
made
with
a
spring
scale
that
is
calibrated
to
read
Torque
in
gram-cm.
for
a
7”
reel
with
a
small
reel
hub.
If
the
spring
scale
you
are
using
is
calibrated
to
read
Force
or
Weight
in
grams
the
Torque
must
be
calculated
using
the
Formula:
Torque
(in
gm-cm
or
02z:in)
=
Weight
or
Force
(in
gr.
or
02.)
x
radius
of
hub
(in
cm
or
inches)
If
you
are
using
a
reel
with
other
than
the
standard
2.5”
or
6.0
cm
(approx.)
diameter
hub,
the
Torque
must
be
calcu-
lated
using
the
same
formula
and
substituting
the
actual
radius
and
Weight
or
Force
reading.
All
Torque
and
Tension
measurements
must
be
made
with
the
automatic
shut-off
switch
(right
tension
arm)
held
in
the
ON
position.
Brake
Torque
Measurement
should
be
made
using
large
hub
reel
with
a
hub
diameter
of
4”
or
10.2
cm.
Fig.
7-3
Torque
Measurement
and
Formula
7-3.
TAKE-UP
TORQUE
1.
Place
the
empty
reel
on
the
right
reel
table
and
attach
spring
scale.
2.
Place
the
deck
in
the
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.
Repeat
the
procedure
for
the
Reverse
(q
)
Play.
6.
The
reading
or
calculated
value
should
be
approx.:
SMALL
size
value
is
for
reference
only
REEL
SIZE
LARGE|790
to
870
g-cm
(11
to
12
oz-inch)
SMALL
|370
to
410
g-cm
(5
to
6
oz-inch)
LARGE|1000
to
1100
g-cm
(14
to
15
oz-inch)
DIREC-
TION
TAKE-UP
VALUES
FWD
ie
BEY.
SMALL]500
to
550
g-cm
(7
to
8
oz-inch)
A-3300
SR
DIRECTION
|
TAKE-UP
VALUES
|
FWD
|
to.
ozinch
A-2300SR.
r
5
500
to
540
g-cm
ey
(7
to
8
oz-inch)
7-4
BACK
TENSION
1.
Place
an
empty
7”
reel
with
small
hub
on
the
left
reel
table
and
fasten
one
end
of
a
30”
Jength
of
string
to
the
reel
anchor.
2.
Wind
several
turns
of
string
counter-clockwise
around
the
hub.
Attach
spring
scale
to
string.
3.
Place
the
deck
in
the
Play
mode.
4.
Pull
the
scale
away
from
the
reel
against
the
motor
tor-
que
with
a
steady,
smooth
motion.
5.
Note
the
scale
reading
while
it
is
in
steady
motion.
(The
string
must
not
rub
the
reel
flanges)
6.
Repeat
the
procedure
for
the
Reverse
(
q
)
Play.
7.
The
reading
or
calculated
value
should
be
approx.:
SMALL
size
value
is
for
reference
only
A-3300
SR
T
DIREC-
|
REEL
TION
SIZE
BACK
TENSION
VALUES
FWD
LARGE
|
280
to
360
g-cm
(4
to
5
oz-inch)
SMALL
|
175
to
215
g-cm
(2.4
to
3
oz-inch)
REV
LARGE
|
320
to
400
g-cm
(4.5
to
5.6
oz-inch)
SMALL
|
185
to
225
g-cm
(2.6
to
3
oz-inch)
A-2300SR
DIREC-
TION
BACK
TENSION
VALUES
FWD
175
to
215
g-cm
(2.5
to3
oz-inch)
REV
185
to
225
g-cm
(2.6
to3
oz-inch)
Adjustment
Location
If
necessary,
adjust
slider
of
the
resistors
until
you
have
the
correct
scale
reading
for
optimum
torque.
Refer
to
adj.
location
below.
R2
R1
R3
cry
TH
|_|
ana
T+
#30
A-2300SR
Fig.
7-4
Adjustment
Location
7-5
TAPE
SPEED
CHECK
The
tape
speed
should
be
measured
using
TEAC
flutter
free
tape,
Model
YTT-2003
(7-1/2
ips)
and
YTT-2002
(3-3/4
ips).
These
tapes
contain
a
highly
accurate
3,000
Hz
tone.
Connect
a
digital
frequency
counter
to
either
line
OUTPUT
jack.
See
Fig.
7-5.
The
indicated
frequency
should
be
3,000
Hz
(+30
Hz)
for
all
speeds
during
playback
of
the
tape.
7-6
WOW
AND
FLUTTER
CHECK
NOTE:
Before
performing
this
measurement,
clean
the
heads
and
Tape
run
guides,
also
check
pinch
roller
pressure,
etc.
Use
new
Test
Tape
if
possible
for
following
checks.
Values
obtained
with
different
standards
of
equip-
ment
cannot
be
compared.
PLAYBACK
1.
Connect
Test
equipment
to
the
deck
as
shown
Fig.
7-5.
(Except
oscillator).
2.
Load
TEAC
YTT-2003
(for
7-1/2
ips)
or
YTT-2002
(for
3-3/4
ips)
and
playback
tape.
3.
Read
the
indication
on
the
Wow
and
Flutter
meter.
4.
The
Wow
and
Flutter
should
be:
0.18%
(RMS)
or
less
for
7-1/2
ips
0.20%
(RMS)
or
less
for
3-3/4
ips
OVERALL
1.
Connect
Test
equipment
to
the
deck
as
shown
Fig.
7-5.
2.
Load
TEAC
YTT-8013
(blank
tape)
Test
Tape
on
the
deck
and
Record
a
3,000
Hz
input
signal.
3.
Rewind
and
playback
the
recorded
signal.
4.
The
reading
on
the
Meter
should
be
0.20%
(RMS)
or
less
for
7-1/2
ips
0.25%
(RMS)
or
less
for
3-3/4
ips
NOTE:
These
figures
apply
to
any
tape
position
(such
as
full
take-up
reel,
full
supply
reel
or
about
mid-
point).
Also
examine
the
tape
counter
ass’y
for
evenness
of
operation.
FREQUENCY
COUNTER
OSCILLATOR
WOW
&
FLUTTER
METER
DECK
under
TEST
LINE
IN
wm
Fig.
7-5
Test
Connections
for
Wow/Flutter
and
Tape
Speed
Test
7-7
VOLTAGE
AND
FREQUENCY
CONVERSION
(only
General
Export
model)
This
deck
is
adjusted
to
operate
on
an
electric
power
source
of
the
voltage
and
frequency
specified
on
the
reel
tag
and
packing
carton.
If
it
is
necessary
to
change
the
frequency
or
voltage
requirements
of
this
deck
to
match
your
area,
use
the
following
procedures.
Always
disconnect
Power
Line
Cord
before
making
these
changes.
Frequency
Conversion:
1.
Remove
the
right
side
wood
panel
(4
screws),
then
the
rear/top
metal
panel
(6
screws).
2.
Set
the
power
frequency
selector
slide
switch
(located
next
to
the
capstan
motor)
to
the
50
or
60
position
to
match
the
power
line
frequency
in
your
area.
3.
Rotate
the
center
(capstan)
motor
clockwise
with
your
hand
and
re-position
the
belt
onto
the
correct
pulley
as
shown
in
the
motor
pulley
illustration
below.
The
pulley
can
be
seen
by
looking
through
the
opening
in
the
side
panel.
Continue
to
rotate
the
motor
by
hand
approximately
10
revolutions
to
verify
belt
placement
before
replacing
‘the
side
and
rear
covers.
Capstan
Flywheel
Pulley
Rotate
motor
clockwise
ey
while
changing
belt
50_Hz
60
position.
Selector
Slide
Switch
Fig.
7-6
Frequency
Conversion
Voltage
Conversion:
The
deck
may
be
set
for
100,
117,
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
speci-
fied
on
the
label
on
the
rear
of
the
deck.
Fig.
7-7
Voltage
Conversion
8.
MEASUREMENT
AND
ADJUSTMENT
—
ELECTRICAL
—
©
Before
performing
maintenance
on
this
unit,
thoroughly
clean
and
demagnetize
the
entire
tape
path.
TEAC
maintenance
equipment
to
be
used:
TEAC
TZ-261
for
cleaning
TEAC
E-3
for
demagnetizing
or
equivalent
@
The
electrical
adjustment
procedure
for
the
A-3300SR
and
A-2300SR
are
identical,
also,
the
tape
speeds
of
the
two
models
are
the
same
(7-1/2
ips,
HIGH
and
3-3/4
ips,
LOW
speed).
The
checks
and
adjustments
are,
unless
otherwise
indicated,
for
the
left
channel
at
the
LOW
tape
speed.
The
same
procedures
are
to
be
applied
for
the
right
channel
also
and
again
for
both
channels
at
the
HIGH
tape
speed.
©
It
is
important
that
the
deck
be
set
to
proper
voltage
and
frequency
for
your
locality.
8-1
ADJUSTMENT
LOCATIONS
AND
ADJUSTMENT
POINTS
ho
mh
platen
NG
*
PLAY
BACK
Ns
‘)
i)
302
8
1301
L302
[~
@1
vce401
L
L
@2
veso2
f
BIAS
TRAP
eo——-@
L201
L202
©
rec
eg
YR
REC
M
CAL
®
9
Mm
VR305
BIAS
TRAP
Bi
VR304
MONI
CAL_VR301
q9
1303
L304
ADJUSTMENT
ADJUSTMENT
14
VR101/103
P.B.EQ
(HIGH)
VC401/403
VR102/104
P.B.
EQ
(LOW
ae
P.B
ne
one
.B.
L
L201/202
BIAS
TRAP
(OUTPUT)
VR202/204
P.B.
METER
LEVEL
VR301/304
MONITO
maeey
R
LEV
re
L302/304
VR302/305
REC
METER
LEVEL
L401
DUMMY
COIL
VR303/306
REC
LEVEL
eee!
8-2.
ADJUSTMENT
SEQUENCE
CHART
y
>
PLAYBACK
>
OUTPUT
LEVEL
eons
NRE
AD
z
HEAD
AZIMUTH
ADJ.
SETTING
CHECK
AND
ADJ
VU
METER
SPECIFIED
LEVEL
CHECK
LINE
CONTROL
SETTING
MONITOR
LEVEL
SETTING
>
VU
METER
>
FREQUENCY
LEVEL
SET
RESPONSE
(PLAYBACK?!
HEADPHONE
OUTPUT
CHECK
RATIO
(PLAYBACK)
|
MIC
INPUT
LEVEL CHECK
BIAS
TRAP
ADJ.
RECORD
HEAD
AZIMUTH
ADJ.
OPTIMUM
ERAS
MEASUREMENT
URE
SIGNAL-TO-NOISE
FREQUENCY
[_RATIO
(OVERALL)
RESPONSE
(OVERALL)
SIGNAL-TO-NOISE
REC
LEVEL
DISTORTION
CROSS
TALK
CHANNEL
CHECK
REJECTION
SEPARATION
Fig.
8-1
Adjustment
Sequence
Chart
—
—_——
PLAYBACK
PERFORMANCE
8-3
POWER
SUPPLY
CHECK
AND
ADJ.
1.
Remove
wooden
panel
on
left
side
of
the
deck
for
access
to
the
electrical
adjustments.
2.
Depress
power
SW
to
ON.
3.
Connect
a
VITVM
between
the
Power
Supply
P.C.
Bd.
Test
Point
No.
13
and
ground.
See
Fig.
below.
4.
Adjust
R56
for
+23
V
DC.
(see
REAR
VIEW
on
p.
9.)
=—n_
7
AC
Voltmeter
:
R56
|
+23
V
DC
Test
Point
T~HISI
Fig.
8-2
8-4
PLAYBACK
HEAD
AZIMUTH
ADJ.
NOTE:
Before
proceeding
with
the
following
head
align-
ments
be
sure
that
heads
have
been
properly
mounted
as
to
HEIGHT,
TILT
and
TANGENCY.
See
page
10.
—
FINE
ADJUSTMENT
—
TAPE
SPEEDSW
..........
LOW
OUTPUT
SW
............
TAPE
REEL
SW
.............
SMALL
.
Connect
a
VTVM
to
either
OUTPUT
jack.
.
Remove
the
head
Housing
(on
front
panel).
.
Thread
the
following
TEAC
Test
Tape
YTT-1002
on
the
deck.
.
Play
the
10
kHz
Test
Tone
in
section
2
of
the
Test
Tape.
.
Slowly
rotate
the
azimuth
screw
until
maximum
indica-
tion
is
achieved
on
VITVM.
.
Connect
an
oscilloscope
to
the
OUTPUT
jacks
as
shown
in
Fig.
8-3.
.
Adjust
the
azimuth
screw
(If
necessary)
until
the
oscillo-
scope
shows
that
the
signals
are
less
than
45°
out
of
phase.
.
Secure
this
screw
with
a
drop
of
locking
paint.
OSCILLOSCOPE
under
TEST
Fig.
8-3
Head
Alignment
Fine
Adjustment
Set-up
and
Test
Connections
(PLAYBACK)
15
16
8-5
OUTPUT
LEVEL
SETTING
—
MAXIMUM
OUTPUT
LEVEL
CHECK
—
10.
Play
the
400
Hz/O
dB
tone
in
section
1
of
the
Test
Tape.
11.
Turn
the
OUTPUT
controls
fully
clockwise.
12.
Adjust
VR-201/203
for
—2
dB
(615
mV)
at
OUTPUT
jacks.
—
SPECIFIED
OUTPUT
LEVEL
SETTING
—
13.
Reduce
both
OUTPUT
controls
together
until
the
lower
reading
channel
reads
—8
dB.
(approx.
2
o’clock
position).
If
there
is
a
difference
in
level
between
L-ch
and
R-ch,
again
adjust
VR-201/203
(whichever
is
higher)
for
—8
dB
(308
mV).
NOTE:
This
is
the
Specified
Output
level
setting.
Do
not
disturb
this
setting
until
the
remaining
adjustments
have
been
completed.
2
o'clock
Position
T-1137
Fig.
8-4
Specified
Output
Level
Setting
8-6
VU
METER
LEVEL
SET
14.
Adjust
VR-202/204
for
0
VU
reading
on
VU
meters.
8-7
FREQUENCY
RESPONSE
(PLAYBACK)
15.
Thread
TEAC
Test
Tape
YTT-1002
on
the
deck.
16.
Play
Tape
and
compare
readings
on
VTVM
with
the
re-
sponse
limits
given
in
Fig.
8-5.
17.
If
adjustment
is
required,
adjust
VR-102/104
for
LOW
speed.
TAPE
SPEEDSW
.........
HIGH
18.
Thread
a
Test
Tape
YTT-1003
on
the
deck.
Repeat
Step
16.
19.
If
adjustment
is
required,
adjust
VR-101/103
for
HIGH
speed.
20.
Depress
Reverse
Play
(
¢
)
button
and
check
for
suitable
output
from
both
channels.
See
response
limits
given
in
Fig.
8-5.
NOTE:
If
the
frequency
response
does
not
meet
specified
response
limits,
especially
at
the
high-end
of
the
spectrum,
head
should
be
checked
for
accumulated
dirt
or
oxides.
If
clean,
head
azimuth
must
be
re-
adjusted.
RESPONSE
IN
68
4050
00
$00
mK
5K
WK
=
1Bk
22K
BOK
FREQUENCY
IN
Hz
Fig.
8-5
Frequency
Response
—
Playback
—
8-8
SIGNAL-TO-NOISE
RATIO
(PLAYBACK)
1.
2:
OUTPUT
controls
should
be
at
the
Specified
Output
Level
settings.
Thread
a
blank
Test
Tape
on
the
deck
leaving
the
tape
outside
the
capstan
and
pinch
roller.
.
Hold
the
play
supply
reel
stationary
and
depress
the
play
(>
)
or
(
@
)
button.
.
The
VTVM
connected
to
the
OUTPUT
jacks
should
indi-
cated
readings
listed
below,
or
better.
—57
dB,
ormore
....
HIGH
(7-1/2
ips)
—55
dB,ormore
....
LOW
(3-3/4
ips)
NOTE:
This
corresponds
to
Signal-to-Noise
Ratio
of
49
dB
(for
HIGH)
and
47
dB
(for
LOW):
Difference
between
residual
noise
of
—-57
dB/—55
dB
and
specified
output
level
of
—8
dB,
MONITOR
PERFORMANCE
8-9
MONITOR
LEVEL
SETTING
OUTPUT
SW
...........
SOURCE
1.
Turn
LINE
controls
fully
clockwise.
2.
Apply
a
400
Hz
—18
dB
(97
mV)
signal
from
AF
oscil-
lator
to
LINE
IN
jacks.
3.
Adjust
VR-301/VR-304
for
—8
dB
(308
mV)
at
the
OUTPUT
jacks.
OSCILLOSCOPE
OSCILLATOR
DECK
under
TEST
T-390-1
Fig.
8-6
Test
Connections
for
Monitor
Check
8-10
SPECIFIED
LINE
CONTROL
SETTING
4.
Apply
a
400
Hz
signal
at
—8
dB
(308
mV)
to
the
LINE
IN
jacks.
5.
Adjust
LINE
controls
for
—8
dB
(308
mV)
at
OUTPUT
jacks.
NOTE:
At
this
point
both
the
LINE
controls
and
the
OUTPUT
Controls
are
at
the
“Specified
setting”.
Do
not
move
these
controls
unless
instructed
in
this
procedure
to
do
so.
The
accuracy
of
many
of
the
following
adjustments
and
readings
depends
on
these
controls
being
at
the
“Specified
setting”.
8-11
VU
METER
LEVEL
CHECK
6.
Check
VU
Meters
for
0
VU
indication.
7,
Adjust
VR-302/305
for
0
VU,
if
necessary.
8-12
MIC
INPUT
LEVEL
CHECK
This
is
check
only,
no
adjustments
are
to
be
made.
1.
Apply
a
400
Hz
signal
at
—70
dB
(0.244
mV)
to
the
MIC
Input
jacks
(on
front
panel).
2.
Check
for
—8
dB
+2
dB
(244
mV
~
388
mV)
at
OUTPUT
jacks.
When
MIC
Land
R
controls
are
at
MAX.
position.
3.
Change
the
Input
signal
to
—60
dB
Level
(0.774
mV).
4.
Adjust
MIC
Level
controls
L
and
R
for
—8
dB
(380
mV)
at
the
OUTPUT
jacks.
5.
Return
MIC
Level
controls
fully
counter
clockwise
(min.)
to
prevent
noise
insertion
during
following
steps.
8-13
HEADPHONE
OUTPUT
CHECK
1.
With
the
controls
set
as
described
in
Step
8-5,
connect
an
8
ohm
non-inductive
resistor
across
the
head
phone
(PHONE)
jack.
2.
Connect
VTVM
across
the
resistor
while
playing
back
operating
level
on
Test
Tape.
VTVM
should
indicate
—24
dB
+2
dB
(61.5
mV~38.8
mV).
17
8-14
BIAS
TRAP
ADJUSTMENT
OUTPUT
SW
............
TAPE
REC
MODE
SW
............
ON
BIAS
and
EQSW
...:........
1
Select
REC
PAUSE
mode
iy
.
Remove
all
input
signals.
2.
Connect
a
VTVM
or
Oscilloscape
from
ground
to
the
junction
of
L-302
and
C-312
(L-ch)
and
from
ground
to
the
junction
of
L-304
and
C-330
(R-ch).
See
Fig.
8-7.
3.
Adjust
L-302
(L-ch)
and
L-304
(R-ch)
for
minimum
reading
on
scope
or
VITVM.
Use
Plastic
alignment
tool.
Test
Points
ON
REC
METER
AMPL.
T-669
Fig.
8-7
Bias
Trap
Test
Point
8-15
RECORD
HEAD
AZIMUTH
ADJ.
Tape
SPEED
SW.........-.-
LOW
NOTE:
The
effect
of
turning
the
azimuth
screw
will
reg-
ister
on
the
VTVM.
A
slight
delay
will
be
noticed.
Therefore,
the
screw
must
be
rotated
slightly
with
a
pause
to
see
the
effect.
—
FINE
ADJUSTMENT
—
4.
Connect
a
VTVM
to
the
OUTPUT
jack
and
an
AF
oscillator
to
the
LINE
IN
jack.
Set
the
oscillator
to
10
kHz
at
—18
dB
(97
mV).
.
Begin
recording
(Depress
REC
and
PLAY
buttons).
6.
While
recording
and
monitoring
the
tape
playback,
adjust
the
azimuth
screw
for
maximum
reading
on
the
VIVM.
NOTE:
It
is
absolutely
essential
to
accomplish
the
above
adjustment
before
performing
the
following
adj.
to
avoid
phase
errors
greater
than
45°.
7.
Sweep
the
signal
from
40
Hz
to
16
kHz
for
7-1/2
ips
speed
(or
40
Hz
to
10
kHz
for
3-3/4
ips
speed)
and
adjust
the
azimuth
so
all
signal
are
within
45°
between
channels.
8.
Secure
the
screw
with
insulating
locking
paint.
ws
RECORD
PERFORMANCE
OSCILLOSCOPE
OSCILLATOR
ATTENUATOR
(L}
OUTPUT
under
TEST
[2
T-621
Fig.
8-8
Test
Connection
for
Recording
Check
8-16
BIAS
ADJUSTMENT
Be
sure
the
Bias
Trap
have
been
adjusted
per
section
8-14
before
proceeding.
Tape
SPEEDSW...........
LOW
BIAS
and
EQSW
............
1
9.
Apply
7
kHz
signal
at
—18
dB
(97
mV)
to
the
LINE
IN
jacks.
10.
While
recording
on
the
YTT-8013
Test
Tape,
adjust
ca-
pacitor
VC-401/VC-403
for
peak
reading
on
the
VTVM,
then
turn
the
capacitor
clockwise
until
a
decrease
of
4
dB
from
the
peak
is
obtained.
BIAS
and
EQSW
............
2
11.
Apply
400
Hz
signal
at
—8
dB
(308
mV)
tothe
LINE
IN
jacks.
12.
While
recording
on
the
YTT-8023
Test
Tape,
adjust
ca-
pacitor
VC-402/VC-404
for
peak
Bias.
Peak
Bias
400
kz
Decrease
4458
OUTPUT
LEVEL
(dB)
o
BIAS
CURRENT
(mA)
Fig.
8-9
Bias
Limits
Chart
ne
8-17
REC
LEVEL
SET
13.
14.
15.
16.
17.
18.
Place
BIAS
SW
and
EQ
SW
to
the
|
position.
Thread
a
blank
Test
Tape
YTT-8013
on
the
deck.
Place
Tape
SPEED
SW
to
the
7-1/2
ips
position.
Apply
a
400
Hz
signal
at
—8
dB
(308
mV)
to
the
LINE
IN
jacks.
;
Begin
recording.
Adjust
VR-303/306
for
—8
dB
(308
mV)
at
OUTPUT
jacks.
8-18
FREQUENCY
RESPONSE
—OVERALL—
NOTE:
To
avoid
saturation
of
the
tape
these
checks
19.
21.
i
[
L
pa
{
'
RESPONSE
IN
dB
+
:
RESPONSE
IN
4B
should
be
made
at
least
20
dB
below
the
specified
input
level.
Any
Bias
signal
feeding
into
the
test
equipment
should
be
filtered
out
by
adjusting
the
external
Bias
Trap.
BIAS
and
EQSW
............-
1
Tape
SPEED
SW..........-
LOW
Apply
signal
swept
from
40 Hz
to
the
upper
frequency
limit
shown
in
the
applicable
Response
Limits
Chart
below,
and
record
this
signal
on
the
YTT-8013
test
tape
for
BIAS/EQ
1
and
on
the
YTT-8023
test
tape
for
BIAS/EQ
2.
.
During
recording,
monitor
the
tape
signal
and
adjust
equalization
L-301/L-303
for
+2
dB
reading
at
14
kHz
so
that
reading
is
within
the
applicable
Response
Limits
Chart.
Repeat
this
procedure
for
High
Speed
also,
using
the
frequency
limits
given
in
the
applicable
Response
Limits
Chart.
“4
4
it
iit
40
69
63
100
500
«
8K
10K
6K
BOK
FREQUENCY
IN
He
|
:
+4
+2
°
-2
:
|
~4
TI
H
4050
63100
3K
10K
20K
30K
si
1
FREQUENCY
IN
Hz
Fig.
8-10
Frequency
Response
—
OVERALL
—
1
BIAS
and
EQSW
.............-245.
2
Using
blank
Test
Tape
.....
TEAC
YTT-8023
NOTE:
If
the
response
is
not
uniform,
the
heads
should
be
cleaned
of
accumulated
oxide
and
dirt.
Then
adjust
VC-402/404
Bias
Adjuster
slightly
to
obtain
the
best
frequency
response.
+
FS
oO
°
RESPONSE
IN
dB
ny
s
in
TO
nt
3-3/4ips
A
|
+3
[|
{444
pal
|
=|
4
‘om
ct
ni
40
50
63
100
500
"
5K
YOK
12K
50K
RESPONSE
IN
dB
te}
8
&
3
8
™
FREQUENCY
IN
Hz
Fig.
8-11
Frequency
Response
—
OVERALL
—
2
19
8-19
SIGNAL-TO-NOISE
RATIO
—OVERALL—
Using
blank
Test
Tape
...........
YTT-8013
1.
2.
3
Output
and
Line
controls
should
be
at
the
specified
posi-
tions.
Remove
the
AF
oscillator
from
the
LINE
IN
L,
R
jacks.
Place
the
deck
in
the
Record
mode
with
“no
signal”
applied.
Note
the
point
on
the
index
counter
where
re-
cording
begins.
.
Rewind
the
tape
to
the
beginning
point
and
play
it
back.
.
The
noise
level
as
indicated
on
the
VTVM
should
be
readings
listed
below.
...
HIGH
(7-1/2
ips)
...
LOW
(3-3/4
ips)
~55
dB,
or
more
—53
dB,
or
more
NOTE:
This
—55
dB/—53
dB
corresponds
to
the
Signal-to-
Noise
Ratio
of
47
dB/45
dB
(minimum):
the
dif-
ference
between
residual
noise
of
—55
dB/—53
dB
and
specified
output
level
—8
dB.
NOTE:
Since
this
measurement
method
and
the
measure-
ment
methods
used
to
obtain
the
catalog
and
owner’s
manual
S/N
spec,
are
different,
the
values
here
and
in
the
catalog
and
Owner’s
manual
will
be
different.
8-20
OPTIMUM
ERASURE
MEASUREMENT
Tape
SPEEDSW..........
HIGH
3
Thread
the
TEAC
YTT-8013
Test
Tape
on
the
deck.
2.
Apply
a
1
kHz
signal
at
10
dB
above
the
operating
level
of
—8 dB
(308
mV)
to
the
LINE
IN
jack.
.
Make
a
30
second
recording
of
the
above
signal
while
reading
and
noting
the
level
of
output,
then
rewind
to
beginning
of
this
recording.
.
Disconnect
the
1
kHz
signal
source
(AF
oscillator)
from
the
LINE
IN
jack.
.
Connect
a
VIVM
to
the
OUTPUT
jack,
through
a
1
kHz
Narrow
Band
Pass
Filter.
.
Put
deck
in
the
Record
mode
and
“record”
(erase)
over
this
previous
recording,
then
rewind
to
beginning
again.
.
Put
deck
in
Play
mode
and
monitor
the
output
on
the
VTVM.
.
Difference
in
output
level,
between
the
1
kHz
signal
and
the
“no
signal”
section
level
should
be
more
than
68
dB,
NOTE:
Filter
loss
should
be
considered.
20
8-21
CHANNEL
SEPARATION
1.
Be
sure
tape
is
completely
bulk
erased
prior
to
doing
these
checks.
2.
Apply
a
1
kHz
signal
at
—8
dB
(308
mV)
to
L
chan.
3.
Place
deck
in
Record
mode.
4.
While
recording,
measure
the
OUTPUT
on
R
chan
with
VTVM
connected
through
a
1
kHz
Band
Pass
Filter.
Spec.
should
be
50
dB.
OSCILLOSCOPE
DECK
under
TEST
LUNE
IN
ra)
“shies
IkHz
FILTER
°
)
T-39m
Fig.
8-12
Test
Connections
for
Channel
separation
check
8-22
TRACK-TO-TRACK
CROSS
TALK
REJECTION
Following
is
the
measurement
procedure
at
7-1/2
ips
using
the
TEAC
standard
tape,
Type
YTT-8013:
1.
Thread
the
TEAC
YTT-8013
Test
Tape
on
the
deck.
2.
Apply
a
125
Hz
signal
at
—8
dB
to
the
righi
channel
LINE
IN
jack.
3.
Make
a
30
second
recording
of
the
125
Hz
signd.
4.
Interchange
the
left
and
right
reels
and
rethreal
tape
on
the
deck.
5.
Connect
a
VTVM
to
the
right
channel
OUTPUT
jack.
6.
Playback
the
recorded
signal
portion
of
tape
and
moni-
tor
the
level
on
the
VIVM.
7.
Spec.
should
be
40
dB
or
better.
8-23
DISTORTION
CHECK
Tape
SPEED
..........
7-1/2
ips
BIAS
and
EQSW
............
1
1.
Thread
the
TEAC
YTT-8013
Test
Tape
on
the
wit.
2.
With
Line
and
Output
Controls
at
Operating
(pecified)
Level,
apply
a
1
kHz
signal
to
LINE
IN
jacks,
atO
VU.
3.
Place
the
deck
in
the
record
mode
for
about
10seconds.
Rewind
and
play
this
recorded
section
of
the
taje
-
4.
Read
the
indicated
value
on
the
distortion
analyze
r.
5.
The
distortion
factor
should
be
1.0%
or
less.
9.
SERVICING
AND
MAINTENANCE
9-1
CLEANING:
TEAC
TZ-261A
for
Head
cleaning
and
TZ-261B
for
Rubber
cleaning
should
be
used.
Use
for
following
places.
TZ-261A
Motor
pulley
Heads,
Brake
drums
Capstan
shaft
Tape
run
guides
TZ-261B
Pinch
roller
rubber
Capstan
belt
Counter
belt
9-2
LUBRICATION:
Under
normal
operating
conditions,
lubrication
is
required
only
once
each
year.
Before
lubricating,
clean
the
drive
belt
and
drive
pulley...
etc.
Operate
the
deck
for
30
minutes
to
1
hour
immediately
prior
to
oiling.
After
oiling,
keep
the
deck
in
the
upright
position
for
3
to
4
hours
to
allow
thorough
absorption
of
the
oil.
Approximately
once
each
year
or
after
2000
hours
of
use,
apply
TEAC
TZ-255
Lubricating
Oil
to
the
following
places
only;
—
Pinch
roller
shaft
.............
0000008.
1
drop
-~
Capstan
shaft...
2.2...
.
ee
ee
eee
2
drops
(Remove
the
dust
cap
for
access
to
the
oil
pit)
—
Capstan
motor
and
Reel
Motors
(A-2300SR
only)
0.5
cc
(Maximum
to
fill
oiling
tube)
NOTE:
Apply
3
or
4
drops
at
a
time
through
the
oiling
tube.
The
oil
level
can
be
seen
to
drop
as
the
felt
material
in
the
motor
bearings
absorb
oil.
When
the
level
ceases
to
drop,
no
more
oil
is
needed.
Do
not
attempt
to
force
oil
into
the
motor
nor
ex-
ceed
the
maximum.
Excessive
oiling
will
scatter
oil
inside
the
deck.
This
oil
will
cause
drive
belt
slippage
and
other
difficulties.
Check
for
slippage
and
clean
all
parts
inside
the
deck
before
operating
after
lubrication.
Check
for
oil
emission
after
operation
and
before
returning
deck
to
the
customer.
Fig.
9-1
Capstan
Motor
Oiling
Point
A
Oiling
Points
Fig.
9-2
Capstan
Shaft
and
Pinch
Roller
Shaft
Oiling
Points
9-3
TEAC
MAINTENANCE
FLUIDS
Fig.
9-3
TZ-255
Oi!
Kit
Fig.
9-3
TZ-261
Cleaner
9-4
DEMAGNETIZATION
OF
HEADS
If
the
Record
or.Playback
heads
become
magnetized,
noise
will
increase
and
tonal
fidelity
will
deteriorate.
For
this
reason
it
is
advisable
to
use
non-magnetic
tools
when
work-
ing
near
the
heads.
If
the
heads
have
had
any
contact
with
current
cartying
or
magnetized
metal
parts,
demagnetize
them
with
a
TEAC
E-3
eraser
or
Equivalent.
21
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