Teac A-4010GSL User manual

SALES OFFICE:
TEAC HONGKONG LIMITED
A-4010GSL
STEREO
TAPE
DECK
SERVICE
MANUAL
U.S.
DISTRIBUTOR:
TEAC
CORPORATION
OF
AlERICA
TEAC
CORPORATION
;
7733
TELEGRAPH
ROAD
SHINJUKU
BUILDING
One
8-1,
NISHI-SHINJUKU,
SHINJUKU,
TOKY
S.A.
one
as
pee
EUROPEAN
DISTRIBUTOR:
TEAC
EUROPE
N.
8.
MELBOURNE
PLAZA,
33
QUEEN'S
ROAD
C.
ev
LANG
45-47,
AMSTEIDAM-W.
2,
MAIN OFFICE:
HONG KONG Ee]
PRINTED IN JAPAN, 072° S$ 005
MT4014E100

If
adjustments
or
repair
procedures
are
not
clear
or
seem
diffi-
cult
to
accomplish
or
should
you
desire
more
detailed
technical
information,
please
contact
your
nearest
TEAC
dealer,
TEAC
Corpo-
ration
or
affiliated
corporations
,
address's
of
which
are
printed
in
this
manual.
WONAMNPWN-
This
service
manual
provides
adjustment
and
alignment
procedures,
schematic
diagram
and
parts
replacement
information
and
the
prop-
er
procedures
for
obtaining
necessary
repair
parts.
SCOPE
TABLE
OF
CONTENTS
SL
&
GSL
FUNCT
IONAL-COMPARISON
CHART
SERVICE
DATA
TEST
EQUIPMENT
PARTIAL
DISASSEMBLY
HEADS
ALIGNMENT
-MECHANICAL-
MEASUREMENT
AND
ADJUSTMENT
-MECHANICAL
-
MEASUREMENT
AND
ADJUSTMENT
-ELECTRICAL-
PREVENTIVE
MAINTENANCE
TROUBLE
SHOOTING
“WARRANTY
AND
.SHIPPING
INSTRUCTIONS
EXPLODED
VIEW
AND
PARTS
LIST
PRINTED
CIRCUIT
BOARD
AND
PARTS
LIST
SCHEMATIC
DIAGRAM
MANUAL
CHANGE
SHEET

GENERAL
DESCRIPTION
The
TEAC
A-4010GSL
is
a
two
speed,
four
heads
(Forward;
erase,
record,
playback.
Reverse;
playback),
three
motors,
solenoid
operated,
quarter-track
stereo
open
reel
tape
deck
with
automatic
reversing
during
playback.
The
A-4010GSL
is
also
designed
for
LOW
NOISE/HIGH OUTPUT tapes.
The
TEAC
A-4010GSL
is
a
modernized
version
of
the
A-4010SL.
The
electronics
section
and
deck
mechanism
are
highly
similar
to
the
preceding
model.
Primary
differences
are
shown
below.

1ECHANICAL
Heads:
Tape Width:
Tape Speed:
Motors:
Wow and Flutter:
Fast Winding Time:
Operating Position:
Power Requirements:
Weight:
ELECTRICAL
Transistors:
Diodes:
Frequency Response:
Equalization:
Minimum Input:
1 SERVICE DATA
Four
track
2
channel
stereophonic.
Erase,
1.8k2/100kHz, erase current approx. 30mA
Record,
100Q/1kHz,
bias
current
approx.
2mA
Playback,
3kQ/1kHz
-53dB
se
Standard 1/4inch tape
3-3/4ips and 7-1/2ips (+1.0%)
4/8-pole
dual
speed
hysteresis
synchronous
motor for capstan drive.
6-pole
eddy
current
motors
for
reel
drive.
0.07% 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.
100
second
or
less
for
1,200
feet.
Horizontal or vertical.
100/117/200/220
or
100/117/200/240V
AC
(US
Model,
117V
60Hz
only)
50/60Hz
110W
max.
20.5kg (45.2 lbs)
2SA494(Y) x2
2SC971(Y) x2
2SC732(BL) x8
28C733(Y¥) x12
$1B01-06 x12
$1B02-01 xl
Refer to frequency response limit
NAB equalization
7-1/2ips 3,180usec. + 50usec.
3-3/4ips 3,180usec. + 90ysec.
MIC: Input impedance 30k2
70dB/6002
LINE: ~18dB/100k2

Maximum
Output:
LINE:
Approx.
-2dB/10k2
or
more
HEADPHONE:
-24dB/82
Bias
Frequency:
100kHz
push-pull
oscillator
Signal
to
Noise
Ratio:
50dB
or
more,
peak
record
level
to
unweighted
noise
Cross
Talk
Rejection:
40dB
channel
to
channel
at
1kHz
35dB
adjacent
track
at
100Hz
Erase
Efficiency:
7OdB
or
more
at
7-1/2ips
:
A
These
specifications
are
indispensible
information
and
are
required
to
service
the
equipment
properly.
They
may
differ
slightly
from
those
printed
in
the
advertising
brochures
or
the
operation
manual.
Fig. 1-1 Dimensions

2 TEST EQUIPMENT
For
proper
adjustment
and
measurement,
it
is
recommended
that
the
following
test
equipment
be
available:
FOR MECHANICAL MEASUREMENT
SPRING SCALE:
TEST TAPE:
FLUTTER METER:
DIGITAL FREQ. COUNTER:
TOOLS:
FOR ELECTRICAL MEASUREMENT
TEST TAPE:
EMPTY REEL:
TEST SET:
BAND PASS FILTER:
AC/DC VTVM:
RESISTOR:
OSCILLOSCOPE:
Use of the TEAC M-826A test set is
0v4 kilo-grams (08 1bs) #5086025000
0v300 grams(0V10 oz) #5086026000
TEAC YTT-2003 (7-1/2ips)
TEAC YTT-2002 (3-3/4ips)
Meguro Model MK665B (preferred) or
Sentinel FL-3D-1
Capable of 0 to 5kHz indication
General,
2mm nut driver #5086014000
Hex head, Allen wrench #5086021000
TEAC YTT-1003 for 7-1/2ips
TEAC YTT-1002 for 3-3/4ips
SCOTCH 203 and 150 for recording test
TEAC RE~702 (2" hub)
TEAC RE-701 (4" hub)
TEAC M-826A test set
TEAC M-206A (1kHz)
General purpose
Non inductive type 82/1W
General purpose
recommended. This set incorporates a LEVEL
METER, Audio Oscillator, Channel Selecting
Switch, Variable Attenuator, Monitor Speaker
and Cables.
TEAC M-826A measures the RMS value of the
Voltage
(0
dB=0.775V).
Characteristics
of
this test set are similar to the standard
VU-meter.
TEAC Test Set (M-826A)

a

3 PARTIAL DISASSEMBLY
TAPE
TRANSPORT
REMOVAL
(WITH
FRONT
PANEL
INSTALLED)
-
Lay
the
unit
face
down
on
a
soft
mat.
- With rear cover removed, loosen and
remove three screws at rear sides of
chassis. ae
-
Carefully
slide
transport
from
wooden
case.
AMPLIFIER REMOVAL
~
Remove
four
screws
from
amplifier
front
panel.
-
Slide
amplifier
forward,
remove
four
screws
from
amplifier
cover,
remove
cover.
-
Disconnect
the
cables
connecting
the
tape
transport
and
amplifier.
NOTE:
Edge
connectors
are
held
in
PC
board
by
two
retaining
nuts.
-
To
reinstall
the
amplifier,
reverse
the
procedure,
be
sure
to
reconnect
the
cables.
FACE PLATE REMOVAL
-
Place
the
unit
in
horizontal
position.
-
Pull
off the
pinch
roller
and
unscrew
capstan
dust
cap.
—
Remove
head
assembly
cover
after
re-
moving
mounting
screw
on
top
of
cover.
-
Remove
retaining
screw
on
left
tension
arm
and
lift
tension
arm
upward.
~
Loosen
and
remove
the
reel
height
ad-
justment
screw
in
each
reel
turntable.
~ Lift off the reel tables.
—
Remove
8
small
Phillips
screws
from
the
front
panel
(1
at
each
corner,
1
above
and
below
each
reel
motor).
Front
panel
may
now
be
removed.
~
Reverse
the
procedure
for
reassembly.
Fig. 3-1
Unit Disassembly

REEL HEIGHT ADJUSTMENT
NOTE: Reel height adjustment is required only if a motor has been
replaced or when the tape rubs excessively against the reel flanges.
Load unit with tape (standardized and start the tape. Adjust by
turning the screw in the reel table until the tape does not rub
against the reel flanges.
REEL TABLE ASSY REPLACEMENT
- Remove reel table by loosing the reel height adjustment screw.
- Reel table will slide off upward.
~ Remove the two allen screws at lower end of brake drum.
- Pull out the brake drum in the direction of the motor shaft.
~ Reverse: the procedure for reassembly.
~ Position the brake drum from the edge of the brake band as shown.
REEL HEIGHT
REEL TABLE ASSY
9339
M-O333
Fig. 3-2 Reel Table Assy Replacement
CAPSTAN MOTOR REPLACEMENT
- Slide out the capstan belt.
- Loosen the two set screws on pulley
and lift off pulley.
- Unsolder the six wires connecting
the capstan motor.
-
Remove
four
screws
located
around
capstan
shaft
on
front
panel,
tak-
ing
care
that
the
motor
does
not
drop
onto
other
components.
- Reinstall by reversing above
procedure.
-
Adjust
capstan
belt
tension
by
loos-
ening
the
four
screws
on
the
motor,
position
motor
for
proper
belt
ten-
sion,
then
re-tighten
screws.
- Apply a drop of LOCTITE on the
screws
when
adjustment
is
complete.
Fig.
3-3
Capstan
Motor
Wiring
TAPE SPEED Sw
AC 100V