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