Teac A-6100MKII User manual

SANE
A6100mx«il
Stereo Tape Deck

1. GENERAL DESCRIPTION
The
TEAC
A-6100MKII
open
reel
tape
deck
is
a
1/2
track,
2
channel
(stereo)
master
tape
deck
which
has
1/2
track
record/play
capability
and
also
1/4
track
play
capability.
The
A-6100MKII
operates
at
two
selectable
speeds,
15
ips
and
7-1/2
ips.
It
can
be
used
with
reels
of
up
to
10-1/2”
diameter.
Also,
this
deck
provides
a
choice
of
2
output
levels
(0.3
V
and
0.775
V)
which
are
selec-
table
on
the
rear
panel.
— TABLE OF CONTENTS —
1. GENERAL DESCRIPTION ................ 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
|
—
Rear
View
—
6. HEAD REPLACEMENT AND ALIGNMENT ... 10
—
Mechanical
—
7. MEASUREMENT AND ADJUSTMENT ....... 12
— Mechanical —
8. MEASUREMENT AND ADJUSTMENT ....... 16
— Electrical —
9. SIMPLIFIED SCHEMATIC AND LEVEL
DIAGRAMS........... 0200. e eee eee 23
10. SERVICING AND MAINTENANCE ......... 24
11. THEORY OF OPERATION ............... 25
Fe TERRE Er Eres YE ED Oe A SER REN aN ee SO RE REN Ee SE TLS ee en ee a er ee ae

2.
SPECIFICATIONS
AND
SERVICE
DATA
Track System
Heads
Motors
Reel Size
Tape Speed
Input
(Level and Impedance)
Output
(Level and Load Impedance)
Playback Equalization
Bias Frequency
Power Requirement and
Consumption
Weight
Dimensions (WHD)
1/2-Track, Two-channel Stereo or Mono; 1/4-Track Playback Switchable
Four: Erase, Record, 2-Track Playback, and 4-Track Playback
Three: 1 Dual-Speed Hysteresis Synchronous Capstan Motor; 2 Eddy-
Current Induction Reel Motors
10-1/2” and 7”
7-1/2 ips and 15 ips
MIC: Specified; -60 dB (0.775 mV)/10k ohms
Minimum; —70 dB (0.245 mV) with ATT 0 dB
—50 dB (2.45 mV) with ATT 20 dB
LINE: Specified; —8 dB (308 mV)/50k ohms
Minimum; —18 dB (97.5 mV)
LINE: Specified; —8 dB (308 mV)/50k ohms
Maximum; 0 dB (0.775 V) at HIGH LEVEL
—5.5 dB (411 mV) at LOW LEVEL
Headphone Out; —24 dB (48.9 mV)/8 ohm
15 ips: 3180p sec + 50 usec (NAB)
oo + 35 yt sec (IEC)
7-1/2 ips: 3180 ys sec + 50 w sec (NAB)
100 kHz +5 kHz (push-pull oscillator)
US.A./°
Vv 145 W
General 100, 117
: 145 W
24 kg (53 lbs) net
440 x 512 x 210 mm (17-5/16" x 20-3/16” x 8-1/4")
2-2 SERVICE DATA — MECHANICAL —
Tape Speed Deviation and Drift
Wow and Flutter
Pinch Roller Pressure
Reel Torque
Brake Torque
F.F/REW Time
3.000 Hz, +30 Hz, within 15 Hz
Playback: 0.10% (RMS) at 15 ips
0.12% (RMS) at 7-1/2 ips
Overall: 0.12% (RMS) at 15 ips
0.15% (RMS) at 7-1/2 ips
2.2 kg (4.8 Ibs)
REEL SW TAKE-UP TORQUE
LARGE | 980 to 1030 g-cm (13.7 to 14.4 oz-in. )
SMALL 470 to 490 g-cm (6.6 to 6.9 oz-in. )
BACK TENSION (TAPE TENSION)
Horizontal Vertical
45 to 55 g-cm 55 to 65 g-cm
(0.6 to 0.8 gz-in.) 0.8 to 0.9 oz-in.)
45 to 55 g-cm 65 to 75 g-cm
(0.6 to 0.8 oz-in.) | (0.9 to 1.1 oz-in.)
25 to 35 g-cm 35 to 45 g-cm
(0.4 to 0.5 oz-in.) | (0.5 to 0.6 oz-in.)
1.600 to 2.000 g.cm (22.4 to 28.0 oz-inch)
140 seconds for 1800 foot tape

23
SERVICE
DATA
—
ELECTRICAL
—
7requency
Response
Refer
to
Frequency
Response
Limits
charts
on
page
18,
21.
signal-to-Noise Ratio
(Overall)
fos Taig
<a aT =
irase
Efficiency
68
dB
at
1
kHz
signal
(Measurement
with
input
10
dB
higher
than
the
Specified
Input
Level)
‘tereo
Channel
Separation
50
dB
Channel
to
Channel
at
1
kHz
“otal
Harmonic
Distortion
Overall:
1.0%
at
1
kHz
signal
at
0
VU
NOTE:
As
a
result
of
continuing
changes
and
improvements
during
the
production
run,
minor
differences
may
be
found
between
early
and
later
machines.
Value
of
“dB”
in
the
manual
refers
to
0
dB
=
0.775V.
DIMENSIONS
540mm (2!-5/16")
440mm (I7-5/16") 2!10mm(8- 1/4")
K
\
\
@
¢
/
= =e
= 86660
T-l219
Fig. 2-1 Dimensions

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.
SPRING SCALE... 0.000.200 0 eee 0—4 kg (0-8 lbs)
0—300 g (0-10 02)
FLUTTER METER........ Meguro Denpa Sokki K.K.,
Model MK-668C
DIGITAL
COUNTER
.........
Range;
0
Hz—100
kHz
2
a4
ene
paca
re
BANDPASS
FILTER
...
TEAC
MODEL
M-206A
(1
kHz)
=
Syren
VTVM (AC) ....... Hewlett-Packard Co., Model 400E
AF OSCILLATOR ............4-- 10 Hz—100 kHz
ATTENUATOR ........-..200065 General purpose
OSCILLOSCOPE ..........+--555 General purpose
BLANK TAPE ...........-. TEAC YTT- 8013
TEAC TEST TAPE .... YTT-1003 (7-1/2 ips), YTT-1004
(15 ips) for Playback Alignment test
YTT-2003 (7-1/2 ips), YTT-2004
(15 ips) for Tape Speed Fig. 3-2 Hex Head (allen) Wrench
and Wow and Flutter test
TEAC EMPTY REEL ......... RE-702 (2.5" dia, hub)
. RE-701 (4” dia, hub)
TOOLS ve oxo Sefa- eyed 3 chee APs teat ae aae as General
2 mm nut driver
Hex Head Allen Wrench
Plastic alignment tool
Load resistor non inductive type 8 ohm/1 W
DEMAGNETIZER .......... TEAC E-3 or equivalent
TENSION ANALYZER ....-- TENTELOMETER Type
T2-H20-ML, NJS Co. Model ITAI or equivalent
Fig. 3-3 Spring Scales
Fig. 3-4 Example of Tension Analyzers

4, PARTIAL DIS-ASSEMBLY
-1 OUTER CASE AND PANEL REMOVAL
emove necessary panels as shown in the illustration.
nplug the power cord before removing any panel or
iternal parts.
Fig.
4-1
Outer
Case
and
Panel
Removal
+2 HEAD ASSEMBLY REMOVAL
_,
Remove
the
2
screws
in
the
top
of
the
head
cover
and
"lift
it
off.
2,
Remove
3
screws
holding
head
base
plate
(with
heads).
3. Remove 2 mounting nuts through access slot in head
" pase plate and dis-connect head wires. See Fig. 6-4.
4-3. FLYWHEEL AND CAPSTAN ASS’Y
REMOVAL
.
Unscrew
(by
hand)
the
capstan
dust
cap
(F).
2,
Remove
3
screws
from
capstan
thrust
angle
(A)
and
re-
move
it.
3.
Remove
flywheel
(B)
by
loosening
2
hex
head
set
screws
and
removing
drive
belt
(C).
4.
Remove
arm
support
plate
(D)
and
capstan
ass’y
(E)
by
removing
3
screws.
NOTE:
Wheel
replacing
parts
make
sure
belt
and
capstan
shaft
are
clean
and
free
of
oil.
Clean
these
parts
if necessary.
—_
op
Fig. 4-2 Fiywheel and Capstan Ass’y Removal
Fig. 4-3 Head Ass’y Removal

4-4 REEL MOTOR REMOVAL
1.
Loosen 2 set screws (hex head) in brake drum (A) and
2 in the reel turntable ass’y (D) at front of the reel
motor. Lift off these parts.
. Remove 4 mounting screws securing the brake ass’y (B)
to the motor.
Carefully lift off the brake ass’y (B).
. Remove 4 mounting screws securing reel motor (C) to
chassis through the front panel.
Fig. 4-4 Reel Motor Removal
4-5
RIGHT
TENSION
ARM
REMOVAL
——_-—_
See
illustration
for
complete
dis-assembly
instructions.
Fig. 4-6 Right Tension Arm Removal
ww
4-6 LEFT TENSION ARM AND GUIDE
REMOVAL
.
Loosen
set
screws
in
Impedance
Flywheel
(E)
and
remove
it.
. Remove 3 mounting screws securing the Tension Arm
bracket (D).
. Disconnect one end of spring (B).
.
Loosen
set
screw
in
TENSION
ARM
(C)
and
remove
TENSION
GUIDE
(A).
Also,
remove
TENSION
ARM
(C)
by
removing
E
ring.
LEFT
Fig. 4-5 Left Tension Arm and Guide Removal
RIGHT
(=
GC, 6+ EOE
a
/ ¢
Qum-( Sg Ae
ae
Ga,
ra
Ce
/
Gum -@— Pe
T-1224

5.
TAPE
TRANSPORT
PARTS
LOCATION
—
REAR
VIEW
—
R9
(1002)
Frequency
Selector
SW
for
Take-up
Torque
Adj.
(50
60)
Power Transformer
Right
Ree!
Left
Reel
Motor
Motor
c9,C10
For
Reel
Motor
Capstan
Motor
Servo
P.C.B.
Include
R931
Power
P.C.B.
cs
For
Capstan
Motor
Flywheel
Impedance
Flywheel
Peak
Indicator
aby
P.C.B.
.C.B.
Include
VR801/802
Fuse and Voltage Selector Piug
Fig. 5-1 Tape Transport Parts Location

6. HEAD REPLACEMENT AND ALIGNMENT
— MECHANICAL —
6-1 HEAD REPLACEMENT
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 man-
ner. Replace the nuts securing the new head to the plate.
Perform head alignment before operation.
SHIELD
Playback only
LL
T~1230
Fig. 6-1 Head Replacement
6-2 HEAD ADJ. SCREWS AND ALIGNMENT
PLAYBACK
@® Azimuth adj. screws
© Height and Tilt adj. screws
© Tangency adj. Nuts
Fig.
6-2
Head
Adjustment
Screws
and
Alignment
6-3 VISUAL HEAD ALIGNMENT
Since the head alignment critically affects the frequency
response on both playback and recording, the head align-
ment 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
HHO 0s Caeser eer 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
realigned according to electrical head alignment
paragraph which follows in this Service Manual.
6-4 MIS-ALIGNMENT OF THE HEADS
TILT HEIGHT
(view from side of head) (view from front of head)
TANGENCY AZIMUTH
(view from top of head)
(view from front of head)
Adjust by © Nuts
Fig. 6-3 Head Mis-Alignment —Example —

—HEAD WIRING—
PLAYBACK HEAD
ioe ad | <— 47 sELecToR Sw
vith ) ft.
PLU ie ee
ml
[| ei
L-ch
Sees
Ld Li) be al
ERASE
RECORD
4
TRACK
2
TRACK
:
PLAYBACK PLAYBACK
T-!228
Fig. 6-4 Head Wiring
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:
Voltage
Conversion:
1.
Remove
the
right
side
wood
panel
(4
screws),
then
the
The
deck
may
be
set
for
100,
117,
220
or
240
volts.
To
rear/top
metal
panel
(6
screws).
change
the
voltage
unscrew
the
fuse
in
the
center
of
the
2.
Set
the
power
frequency
selector
slide
switch
(located
voltage
selector
plug.
Pull
out
the
plug
and
reinsert
it
so
the
next
to
the
capstan
motor)
to
the
50
or
60
position
to
desired
voltage
shows
in
the
cutout.
Reinstall
the
fuse
speci-
match
the
power
line
frequency
in
your
area.
fied
on
the
label
on
the
rear
of
the
deck.
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.
SS
Capstan
() Flywheel
Rotate motor shaft
clockwise while
changing belt
position
|
|
|
|
|
|
4
|
|
1
3
;
|
1
;
Selector Slide Switch
11

12
7. MEASUREMENT AND ADJUSTMENT
— MECHANICAL —
7-1 PINCH ROLLER PRESSURE CHECK
NOTE: Pinch roller pressure is supplied by the pinch roller
wn
ON
spring arms and it is most important that the sole-
noid plungers be fully bottomed before taking
pressure measurements.
. Load tape or block the shut-off arm in the ON position.
2. Attach a suitable
spring scale to the pinch roller
shaft.
. Place the deck in the Play ( P ) mode, and holding the
spring scale as illustrated, slowly draw it away from the
pinch roller.
. Do not allow the spring 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 to 2.3 kg (4.6 to 5.0 Ibs).
. 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:
SCREW (A).
Reposition Solenoid to
Obtain Optimum Pressure
Capstan
Shaft
Pressure Measurement and Adj. Location
Fig. 7-1
7-2. BRAKE TORQUE MEASUREMENT
Brake torque measurement is made with Power OFF.
NOTE: The brake torque is actuated mechanically.
Torque is set by the variable Leaf Spring Force.
While making these measurements and adjustments,
be careful not to be bend the brake bands.
Preliminary Adjustments
1,
Loosen the screws marked (A) and (B) in the figure and
then push the solenoid plunger until it is fully bottomed
in the solenoid. At this time adjust the Brake Solenoid
for minimum clearance between Brake Arm and Solenoid
Plunger. Then tighten four screws (B). Then, while the
plunger is fully bottomed, adjust the position of the
Brake Band Space Ass’y so that there is a clearance be-
tween the Brake Band and the surface of the Brake
Drum. Then tighten two screws (A).
Fine Adjustment
2. Place an empty large hub reel on the left reel table, and
fasten one end of a 30” length of string to the reel an-
chor.
. Wind several turns of string counter clockwise around
the hub and attach a suitable spring scale to the free
end of'the string.
. Pull on the spring scale and take a reading only when the
reel is in steady motion since the force required to over-
come static friction will produce a false, excessively high
initial reading.
. The reading should be 1,600 to 2,000 g-cm (22.4 to 28.0.
oz inch).
. If adjustment is required, loosen the 3 screws marked (C)
shown and position the brake for optimum pressure.
. The adjustment of the right brake is the same with the
exception that rotations are clockwise. (wind string
CLOCKWISE around reel hub)
Brake Band Space Adj. (A)
Brake Torque Adj. (C)
Fig. 7-2. Torque Measurement and Adj. Location

TORQUE
MEASUREMENT
PROCEDURE
OTE:
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 02-in) =
Weight or Force (in gr. or 0z.) x
radius of hub (in cm or inches)
f
you
are
using
a
reel
with
other
than
the
standard
2.5"
or
.O
cm
(approx)
diameter
hub,
the
torque
must
be
calcu-
ated
using
the
same
formula
and
substituting
the
actual
adius and Weight or Force reading.
"orque
measurements
must
be
made
with
the
automatic
hut-off
switch
(right
tension
arm)
held
in
the
ON
position.
3rake
Torque
Measurement
should
be
made
using
large
hub
eel
with
a
hub
diameter
of
4”
or
10.2
cm.
se TAKEUP TORQUE IF WO)
1-426
Fig.
7-3
Torque
Measurement
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.
The
reading
or
calculated
value
should
be
approx.:
REEL
SW
TAKE-UP
TORQUE
LARGE
|
980
to
1030
g-cm
(13.7
to
14.4
oz-in.)
470 to 490 g-cm (6.6 to 6.9 oz-in. )
Adjustment Location (Take-up only)
If
necessary,
adjust
slider
of
the
resistors
until
you
have
the
correct
scale
reading
for
optimum
torque.
Refer to adj. location below.
R9 (1002)
for Take-up Torque Adj.
Fig.
7-4
Take-up
Adj.
Location

14
7-4 TAPE TENSION ADJUSTMENTS
(BACK TENSION)
. Place the deck in the horizontal position.
. Attach the tension analizer as shown in Fig. 7—5.
3. Place the deck in the Play mode.
(Use 7” reels and play tape at the beginning).
4. Check that the left tension guide (arm) is positioned ap-
prox. 7 mm above its fully down (lowest) position as
shown in Fig. 7—5.
5. If adjustment is necessary, adjust R931 on Servo P.C.B.
See Fig. 7—6.
6. Also check for the tape tension values given in the chart
below.
7. If adjustment is necessary, adjust the screw shown in
Fig. 7—7.
NOTE: Vertical and F.F/REW value is for reference only.
LO
BACK TENSION (TAPE TENSION)
45 to 55 g-cm 55 to 65 g-cm
(0.6 to 0.8 0z-in.) 0.8 to 0.9 oz-in.)
F.F
45 to 55 g-cm 65 to 75 g-cm
(0.6 to 0.8 oz-in.) | (0.9 to 1.1 oz-in.)
25 to 35 g-cm 35 to 45 g-cm
(0.4 to 0.5 oz-in.) | (0.5 to 0.6 oz-in.)
BACK TENSION MEASUREMENT
AND ADJUSTMENT LOCATION
SET-UP CONNECTING
TENSION ANALYZER
Fig. 7-5 Set-up Connecting Tension Analyzer
ae ae.
Fig. 7-6 Left Tension Guide (Arm).
Position Adj. Location
Fig. 7-7 Back Tension Adj. Screw Location

‘5
TENSION
GUIDE
HEIGHT
ADJUSTMENT
Check
that
there
is
a
clearance
of
approx.
1
mm
between
tension
arm
and
surface
of
the
tape
deck
face
plate.
Thread
Tape
on
the
deck
and
run
it
in
both
directions
to
check
that
tape
moves
in
the
center
of
the
guide.
_
If
adjustment
is
necessary,
loosen
the
screw
and
move
tension
arm.
Then
tighten
screw
and
repeat
step
1
and2.
Tension GUIDE
|
mm
Face
Plate
~«— Adj. Screw
T-1012
Fig. 7-8 Tension Guide (Arm) Height Adj.
7-4
REEL
TABLE
HEIGHT
ADJUSTMENT
Reel
height
adjustment
is
required
only
if
a
motor
has
been
eplaced
or
if
tape
rubs
excessively
against
the
reel
flanges.
\djustment
is
accomplished
by
loosening
the
reel
set
screws
ind
moving
the
reel
table
on
the
motor
shaft
as
shown
in
rig.
7-9.
Zemove
the
wooden
side
board
on
the
left
or
right
of
the
iit
for
access
to
the
Set
Screws
(2)
in
the
reel
motor
shaft.
Reel
table
should
be
adjusted
using
standard
NAB
10”
reels.
With
a
tape
loaded
on
the
machine,
position
the
reel
table
reight
for
smooth
tape
travel.
Be
sure
to
tighten
the
Set
Serews
after
each
adjustment
is
made.
E a
T-1tOS |
Tape should
Set wind evenly
Screws on Reel
Fig. 7-9 Reel Table Height Adj.
7-7
TAPE
SPEED
CHECK
The
tape
speed
should
be
measured
using
TEAC
flutter
free
tape,
Model
YTT-2003
(7-1/2
ips)
and
YTT-2004
(15
ips).
These
tapes
contain
a
highly
accurate
3,000
Hz
tone.
Con-
nect
a
digital
frequency
counter
to
either
line
OUTPUT
jack.
See
Fig.
7-10.
The
indicated
frequency
should
be
3,000
Hz
(+30
Hz)
for
all
speeds
during
playback
of
the
tape.
7-8
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.
7-10.
(Except oscillator).
2.
Load
TEAC
YTT-2003
(for
7-1/2
ips)
or
YTT-2004
(for
15
ips)
and
playback
tape.
3.
Read
the
indication
on
the
Wow
and
Flutter
meter.
4. The Wow and Flutter should be:
0.12% (RMS) or less for 7-1/2 ips
0.10% (RMS) or less for 15 ips
OVERALL
1.
Connect
Test
equipment
to
the
deck
as
shown
Fig.
7-10.
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:
0.15% (RMS) or less for 7-1/2 ips
0.12% (RMS) or less for 15 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
Po
DECK wow & FLUTTER METER
under TEST
Fig. 7-10 Test Connections for Wow/Flutter
and Tape Speed Test
15

8. MEASUREMENT AND ADJUSTMENT
— ELECTRICAL —
e Before performing maintenance on this deck, thoroughly clean and demagnetize
the entire Tape path. TEAC maintenance equipment to be used:
TEAC TZ-261 A/B for cleaning
TEAC E-3 or equivalent for demagnetizing
e Service Data were determined using TEAC YTT Series Test Tape.
e The deck must be matched to the voltage and frequency of your locality.
e Most amplifier checks and adjustments can be made from the bottom with the
(bottom) metal panel removed.
e The procedures for checks and adjustments are normally done for the left and
right channels and at both speeds. The adjustment locations such as R263/264
indicate left channel/right channel adjustments.
8-1 ADJUSTMENT LOCATIONS AND ADJUSTMENT POINTS
L-ch +— = —*R-ch L302
C405
L201 L202 ; lech &
-PB.EQ, ° BAIS TRAP——-— © Oo « BIAS ADU
eas VR201 vR203
H H O—PB CAL——@ R-ch— @
vriol © vrio3 C406
| |
vrio2 @ o VRIO4 “O.—PBM owe
L
EQUALIZER,MIC AMPL.BOARD LINE, PHONE AMPL. BOARD RECORD, METER AMPL. BOARD BIAS OSC BOARD
T-1235
Fig. 8-1 Adjustment Locations and Adj. Points
8-2. ADJUSTMENT SEQUENCE CHART
= PLAYBACK PERFORMANCE -
PLAYBACK
HEAD
OUTPUT
LEVEL
VU
METER
FREQUENCY
RESPONSE
FEES
RENCE
Raee
RAGiO
AZIMUTH
ADJ.
SETTING
LEVEL
SETTING
~—
PLAYBACK
-
LEVEL
CHECK
CHECK
~— MONITOR PERFORMANCE —
POWER SUPPLY
CHECK
PEAK LEVEL CHECK VU METER MONITOR
INDICATOR OUTPUT LEVEL LEVEL c
CHECK AND ADJ. LEVEL SETTING SETTING
~ RECORD PERFORMANCE —
RECOR ;
BIASTRAP| | PES cpl] Nea pias |_| Pever. |_| FREQUENCY RESPONSE |_| SIGNAL-TO-
ADJ. : ADI. — OVERALL —
CHECK AZIMUTH ADJ. SET RATIO CHECK
HEADPHONE
OUTPUT DISTORTION CHANNEL OPTIMUM
PabeK CHECK SEPARATION | | ERASURE
Fig. 8-2. Adjustment Sequence Chart
16

-3 POWER SUPPLY CHECK
_
Remove
Bottom
panel
of
the
deck
for
access
to
the
Power
Supply
Test
Points.
.
Depress
POWER
SW
to
ON.
.
Connect
a
VIVM
between
the
BIAS
OSC
P.C.
Board.
Check
across
Test
Points:
-Test
Point
No.
13
and
ground
for
+24V
(+1V)
DC
Test
Point
No.
7
and
ground
for
+7V
(+1V)
DC
.
Check
only.
No
adjustment
is
provided.
Fig. 8-3 Power Supply Check Points
—
PLAYBACK
PERFORMANCE
—
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.
PREPARATION
OUTPUT
LEVEL
SW
(on
rear
panel)
.
LOW
TIMER
SW
...
2.2.
ee
ee
ee
eee
OUT
MEMORY
SW
......----++
0-05?
OFF
REEL
SW
....
2.60
eee
eee
es
SMALL
Tape
SPEED
SW........---
0+
LOW
OUTPUT
SW
......----
0-0
ee
TAPE
Playback
Head
Selector
SW
.......-
2T
EQ
(15
ips)SW
2.2...
eee
ee
eee
NAB
Fig.
8:4
Front
Panel
SW
Location
and
Specified
Output
Level
Position
—
FINE
ADJUSTMENT
—
.
Connect
a
VIVM
to
either
OUTPUT
jack.
. Fold up the Head Cover.
.
Thread
the
TEAC
YTT-1003
Test
Tape
on
the
deck.
.
Play
the
16
kHz/—10
dB
Test
Tone
in
section
2
of
the
Test Tape.
5.
Slowly
rotate
the
Azimuth
screw
until
maximum
signal
is
read
on
the
VTVM.
6.
Connect
an
Oscilloscope
to
the
OUTPUT
jacks.
7.
Adjust
the
Azimuth
screw
(if
necessary)
until
the
Oscillo-
scope
shows
that
the
signals
are
less
than
45°
out
of
phase
for
50
Hz
to
10
kHz
signals.
Check
these
signals
from
the
frequency
response
section
of
the
Test
Tape.
8. Secure the screw with a drop of locking paint.
hRWNe
OSCILLOSCOPE
DECK
under TEST
Fig.
8-5
Head
Alignment
Fine
Adj,
Set-up
and
Test
Connections.
(PLAYBACK)
8-5 OUTPUT LEVEL SETTING
— SPECIFIED OUTPUT LEVEL —
9.
Play
the
400
Hz/0
dB
tone
in
section
1
of
the
YTT-1003
Test
Tape.
10.
Set
the
reference
mark
of
the
OUTPUT
level
Control
to
the
click
(CAL)
position.
11.
Adjust
PB
CAL
VR201/203
for
—8
dB
(308
mV)
at
OUTPUT
jacks.
— MAX. OUTPUT LEVEL CHECK —
12.
Turn
the
OUTPUT
Level
Controls
fully
clockwise
(MAX)
and
check
for
—5.5
dB
+2
dB
(367
mV
to
461
mV)
at
OUTPUT
jacks.
13.
Reduce
OUTPUT
Level
Controls
until
—8
dB
(308
mV)
is
obtained
on
the
output
VTVM.
NOTE:
This
is
the
Specified
Output
Level
setting.
Do
not
disturb
this
setting
until
the
remaining
adjustments
have
been
completed.
17

8-6 VU METER LEVEL SETTING
14. Adjust PB M CAL VR202/204 for 0 VU reading on VU
Meters.
8-7 FREQUENCY RESPONSE — PLAYBACK —
15. Thread TEAC YTT-1003 on the deck.
16. Play Tape and compare reading on VTVM with the res-
ponse limits given in Fig. 8-6 (A) (B).
17. If adjustments is required, adjust PB EQ VR102/104 for
LOW speed.
* &
BO
+
eS
°
RESPONSE IN dB
,
1
s
Tape SPEED SW............ HIGH
18. Thread TEAC YTT-1004 on the deck.
19.
Play
Tape
and
compare
reading
on
VTVM
with
the
res-
ponse
limits
given
in
Fig.
8-7
(C)
(D).
20.
If
adjustment
is
required,
adjust
PB
EQ
VR101/103
for
HIGH
speed.
r — T
Ht
2T 1Sips (HIGH)
taba \. {44 5
:
Cc
g-at—3
=S
|
hae +4) 4T [Sips (HIGH) Lea
2
g° D
=
at
oo
+ | 14
30
50
100
400
600
1K
aK
0K
22K
SOK
FREQUENCY IN Hz T1232
Fig. 8-7 Frequency Response (C) (D) — PLAYBACK —
EQ(15ips)SW
......0.00
eee
IEC
21. Also check that IEC Frequency Response is within
—3 dB +2 dB at 10 kHz.
NOTE: If the response is not uniform, the head should be
checked
for
accumulated
dirt
or
oxide.
If
clean,
head azimuth must be readjusted.
8-8 DIFFERENCE LEVEL CHECK
2T PLAY AND 4T PLAY
22.
With
the
controls
set
as
described
in
item
8-5,
Check
that
the
difference
in
the
playback
level
between
2T
and
4T
play
is
within
the
following
limits,
4.5 dB or less. Also check that the difference between
channels is within 2.0 dB or less at 4T.
8-9 SIGNAL-TO-NOISE RATIO
— PLAYBACK —
23. OUTPUT Level Control should be at the Specified (CAL)
Output Level setting.
24. Remove Test Tape from deck. Hold Shut-off arm in
ON position.
25. Depress the Play ( > ) button.
26. The VTVM connected to the OUTPUT jacks should in-
dicate listed value below.
TRACK HIGH (15 ips) | LOW (7-1/2 ips)
oT NAB —60 dB, or more —58 dB, or more
JEC —61 dB, or more —
4T NAB| -—56 dB, or more —56 dB, or more
IEC —57 dB, or more —
NOTE: This corresponds to Signal-to-Noise Ratio of 52 dB
(for NAB, HIGH): Difference between residual
noise of —60 dB and Specified Output level of —8
dB.

— MONITOR PERFORMANCE —
3-10 MONITOR LEVEL SETTING
OUTPUT SW............ SOURCE
LINE Level Controls ......... MAX.
. MIC Level Controls ........... MIN
. Apply a 400 Hz/—18 dB (97.5 mV) signal from AF
Oscillator to LINE IN jacks.
: Adjust MONI CAL VR301 for —8 dB (308 mV) at LEFT
OUTPUT jack.
3. Reduce both INPUT Level controls so that L channel
output level decreases by 10 dB.
+. Increase AF Oscillator Output level to —8 dB (308 mV).
. Adjust MONI CAL VR304, if necessary, for —8 dB (308
mV) Output at R channel.
NOTE: This is the specified setting of the LINE Level
Controls. Do not move this setting until the adjust-
ment procedure is finished. Set marker ring to
mark specified setting of LINE Level Controls.
w
we
OSCILLOSCOPE
OSCILLATOR
under TEST
1-390-1
Fig. 8-8 Test Connections for Monitor Check
3-11 VU METER LEVEL SETTING
). With the Controls set as described in 8-10.
Adjust REC M CAL VR302/305 for 0 VU reading on
VU Meters.
8-12 CHECK OUTPUT LEVEL
(SELECTOR SW on REAR PANEL)
7. Set the controls as described in 8-10 (Specified Input
Level —8 dB).
8. Switch OUTPUT LEVEL SW on Rear Panel from LOW
(normal position) to HIGH position.
9. Check that reading changes from the —8 dB (LOW) to
0 dB +1 dB (HIGH) at output. At the same time note
that indication on VU Meter should be +0.5 VU or less.
Also, after check set OUTPUT LEVEL Selector SW
to LOW position.
e
y
0
u
8
UF
0
y
i
$
‘
Fig. 8-9 Output Level Selector SW Location
8-13 PEAK LEVEL INDICATOR
CHECK AND ADJ.
10.
With
the
Controls
set
as
described
in
8
—
10.
11.
Apply
the
following
level
400
Hz
signals
to
LINE
IN
jack.
12.
Adjust
VR801/802
for
PEAK
Level
indicator
Lights
at full intensity.
Tape SPEED INPUT LEVEL
AGH 0 ip)
LOW (713 pd
NOTE: 1. Apply to one channel only.
2. LOW speed has no adjustment. Check only.
3.
Also
check
that
the
PEAK
Level
lamp
goes
out
when
the
level
is
decreased
by
0.5
dB
below
Full
Intensity Input Level.
19
;

— RECORD PERFORMANCE —
8-14 BIAS TRAP ADJUSTMENT
OUTPUT
SW
...........---
TAPE
EQ,
BIASSW.........0000
eee
1
RECORD
MODE
SW(L,R)
.....-.
ON
1. Remove all Input signals.
2.
Thread
Blank
Test
Tape
on
the
deck
and
depress
RE-
CORD
and
PAUSE
button.
3.
Connect
a
VTVM
or
oscilloscope
from
ground
to
the
junction
of
L302
and
C321
(L-ch)
and
from
ground
to
the
junction
of
L304
and
C344
(R-ch).
See
Fig.
8-10.
4.
Adjust
BIAS
TRAP
L302
(L-ch)
and
L304
(R-ch)
for
minimum
reading
on
scope
or
VTVM.
Use
plastic
align-
ment
tool.
L302
L-ch
TRAP
TEST P.T.
Fig. 8-10 Bias Trap Test Points
8-15 BIAS LEAKAGE CHECK
5.
With
Output
Control
and
Line
Controls
at
any
position
Bias
Leakage
should
be
the
following
value
at
OUTPUT
jacks.
Spec. —45 dB (4.36 mV), or less.
.
If
adjustment
is
necessary,
adjust
BIAS
TRAP
201/202.
Check
the
EQ
1,
2,
BIAS
1,
2
and
SOURCE,
TAPE
po-
sitions.
.
OSCILLATOR
Fig.
8-11
Test
Connections
for
Recording
Check
8-16 RECORD HEAD AZIMUTH ADJ.
NOTE: The effect of turning the azimuth screw will re-
gister on the VTVM. A slight delay will benoticed.
Therefore, the screw must be rotated slightly with
a pause to see the effect.
— FINE ADJUSTMENT —
7.
Connect
a
VTVM
to
the
OUTPUT
jack
and
an
AF
os-
cillator
to
the
LINE
IN
jacks.
Set
the
oscillator
to
10
kHz
at
—28
dB
(30.8
mV).
8.
Begin
recording
(Depress
RECORD
and
Play
buttons).
9.
While
recording
and
monitoring
the
tape
play
back
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°.
10.
Sweep
the
oscillator
frequency
from
40
Hz
to
16
kHz
(both
speeds)
and
check
that
phase
difference
between
channels
is
45°
or
less.
11. Secure the screw with locking paint.
8-17 BIAS ADJUSTMENT
Tape SPEED SW....... eo diseie LOW
EQ, BIASSW...... ie Ret ee at 1
Be sure the Bias Trap has been adjusted per section
8-14 before proceeding.
12. Apply 7 kHz signal at —18 dB (97.5 mV) to the LINE
IN jacks.
13.
While
recording
on
the
YTT-8013
Test
Tape,
adjust
Trimmer
Capacitor
BIAS ADJ.
C405/406
for
peak
reading
on
the
VIVM,
then
turn
the
Trimmer
Capacitor
clockwise
until
a
decrease
of
2.5
dB
“Over-bias”
from
the
a
peak
is
obtained.
(Adjustment
limits,
2
to
4
dB
over-bias).
Peak
Decrease
2.5dB
5 7kHz
(-18dB)
———> BIAS T-1266
Fig. 8-12 Bias Limits Chart

8
14.
LS.
-18 RECORD LEVEL SET
Tape SPEED SW..... LOW (7-1/2 ips)
Apply 400 Hz signal at —8 dB (308 mV) to the LINE IN
jacks. Be sure the line and output level controls are still
at their specified positions (See 8-5 and 8-10).
Begin recording.
. Adjust REC CAL VR303/306 for —8 dB (308 mV) at
OUTPUT jacks.
8-19
FREQUENCY
RESPONSE
—
OVERALL
—
NOTE:
ae
RESPONSE iN dB
!
iy
18. Apply signal swept from 30 Hz to 20 kHz —8 dB (308mV)
To avoid saturation of the tape these checks should
be made at 10 dB below (—18 dB for LOW speed)
and HIGH speed check at specified input Level
—8 dB.
Any Bias signal feeding into the test equipment
should be filtered out by adjusting the external
Bias Trap.
Apply
signal
swept
from
40
Hz
to
20
kHz,
—18
dB
(97.5
mV)
to
the
LINE
IN
jacks
and
while
recording,
monitor
the
Tape
signal
and
adjust
equalization
REC
EQ
L301/303
for
reading
within
the
response
limits
charts.
See
Fig.8-13(A)
below.
+ rs
+ n
°
1
ES
Lat
400 500 1K ‘8K 40K 16K 20K ‘SOK
FREQUENCY IN Hz 1233
Fig. 8-13 Frequency Response (A) — OVERALL —
Tape SPEED SW....... HIGH (15 ips)
to the LINE IN jacks.
19. Check within the response limits charts (B) below.
RESPONSE IN dB
If L301/303 are adjusted, check LOW speed section again.
+
ES
+ oy
°
‘
n
I
Ss
‘400 500 IK
FREQUENCY IN Hz
Fig.
8-14
Frequency
Response
(B}
—
OVERALL
—
EQ SW
BIAS SW... 1... eee 2
20.
Apply
signal
swept
from
30
Hz
to
20
kHz,
—8
dB
21.
(30.8 mV) to the LINE IN jacks and record on a blank
TEAC YTT-8013 Test Tape.
Check that the Frequency Response, is within 2 dB +2
dB at 20 kHz (at 7-1/2 ip SPEED).
22. If adjustment is required, adjust VR 401.
8-20
SIGNAL-TO-NOISE
RATIO
—
OVERALL
—
1.
NOTE:
NOTE:
Output
and
Line
Controls
should
be
at
the
specified
po-
sitions.
.
Remove
the
AF
oscillator
from
the
LINE
IN
jacks.
.
Thread
a
Blank
Test
Tape
YTT-8013
on
the
deck.
.
Place
the
deck
in
the
Record
mode
with
‘“‘no
signal”
ap-
plied.
.
Note
the
point
on
the
index
counter
where
recording
begins.
.
Rewind
the
recorded
tape
to
the
beginning
point
and
play it back.
_
The
noise
level
as
indicated
on
the
VTVM
should
be
read-
ings listed below.
—56
dB
(1.23
mV)
or
more
..
HIGH
(15
ips)
NAB
—§6
dB
(1.23
mV)
or
more
..
LOW
(7-1/2
ips)
NAB
—57
dB
(1.09
mV)
or
more
..
HIGH
(15
ips)
IEC
This
—56
dB
(for
HIGH,
NAB)
corresponds
to
a
Signal-to-Noise
Ratio
of
48
dB
(minimum):
the
dif-
ference
between
residual
noise
of
—56
dB
and
specified
output
level
—8
dB
(308
mV).
EQ,
BIAS
1
or
2,
either
position.
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
have
and
in
the
Catalog
and
Owner’s
manual
will
be
different.
21