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JVC KD-A11 User manual

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MODEL
KD-A11
A/B/C/E/J/U
STEREO
CASSETTE
DECK
No.
4192
June
1980
KD-A11A/B/C/E/J/U
Contents
Page
SPECIE
CATIONS
55
5-5
cok
Bars
4a
fae
Ses
ress
Seca
Sh
eR
Fae
BO
RR
Gd,
wee
det
Rae
oe
a
Starla
ah
dors
eats
2
F@AtUres
i.
gag
5
ote
het
rsel
e
e
Se
het
iw
Sg
Weptncas!
eyecare
ose
ead
ev
hes,
te
ea
edde
sd
was
wPensiya
alone:
Bones
eae
ye
3
Controls'and
Comnections:s
s/s:
0:30
%s.
si6!
9%
ores
aie:
wh
8
av
eee:
whe
eed
ae
Be
Ne
ae
Avenel
eee
ele
we
Oba,
8
Sie
anar
wes,
Aes
3
Mairi
Parts
Locations
i.-c.
5
Soe
dondeet
etd aie
ered.
ee
ol
eee
ws
Boh
al
stele
rela
Pieter
tee
sak
a
ee
ee
oe Ge
4
Wa
iri
teria
Ce
i
osteo
Sic
Se
ain
cae
ah
aw
aes
wie
Sica
ontee
0
AS
caw
stn
Sadan
es
BAM
Soe
wr
cues
MUR
abe
>
hdd
Dore
Mebane
5
Removal:
of
the
Main.
Parts:
36065.
6
65
8
aie
ae
ee
oo
8
aw
Se
eb
ere
Blas,
wk
RE
ieca
&
@
pele
eee
ene
5
Mair
Adjustment
sic.
g.5:
3:55,
c5.d55
ce
coe
p
Syagasee
oar
ee
bb
wale
ole
See
enh
ersten
dg
cedteisbte
ued
aa
ow
we
ewe,
mie
Sees
9
[niteatant:
Circuits
io
c:o
ss.
g
cece
eis
ead
ie
aes
ee
A
Are
eee
EASE
tae
white
et
SG
13
Block
'Diagranny
ses
sresin
yo
Giaee
ceases
fone
hore
aceves
tne
vel
Tegel
gaa
Ricudse
ay
lees
Glatace
eed
duasae
a,
Pelle
oeeaa
4
14
Wiring
CONMOCHORN
G6
scic
eek
eee
cee
Se
Ee
aerate
Be
NSE.
wy
cece
elle
te
hd!
SPaeeaw
oe
Sesh
ele
ig
iceeteg
aboa
te
6
15
Standard
Schematic
Diagram...
2...
0.0.6.
ee
eee
eee
te
ee
ee
ete
16
Mechanical
Component
Parts...
.......
0.0
eee
ee
ee
ee
ee
eee
ee
tee
e
ee
nee
eae
17
Mechanical
Component
Parts
List...
........
2c
eee
ee
ee
ee
ee ee ee
ee
eee
eee
ee
18
Enclosure
Assembly
and
Electrical
Parts
List
..........
000
eee
eee
ee
tet
eee
eee
eee
nes
21
Enclosure
Assembly
and
Electrical
Parts
........
0.
cc
ee
ee
ee
ee
ee
eee
ee
23
Main
Amp
P.W.
Board
Parts.
........
0c
cee
enc
tc te et
tet
et ee
ene
we ee
ene
ease
rest
eesene
24
Main
Amp
P.W.
Board
Parts
List...
2...
2.
2
ee
eee
ee
ee
ees
25
Other:
P.W..
Board
Parts:
ists:
e's
cox.
4
assed
Sete
ear
ogo
eae
ee
eee
a
eho
Satay
hs
le
Ace
ad
BG
Sg
ab
eae
28
Packing,
Packing
Material
List.
0...
ce
cc
cc
we
eee
abet
ee
eee
sete
deena
ecceceas
28
AINGCESSOM
GSS»
57552
ono
69
ela
latte
Gy
oo
eee
epee
le
ee
hse
a
ayeie
abe
eaten
acaba
colin
liner
evade:
Ai.che
a
bay
Sine
aban
oars
29
Specifications
Type
Track
system
Tape
speed
Frequency
response:
(O
VU
recording)
Metal
tape
SA/Chrome
tape
SF/Normal
tape
(-20
VU
recording)
Metal
tape
SA/Chrome
tape
SF/Normal
tape
:
Stereo
cassette
deck
:
4-track,
2-channel
:
1-7/8
inch/sec
(4.8
cm/sec)
*1
;40-11,000
Hz
(+3
dB)
*2;40-8,000
Hz
(+3dB)
*3
;40—8,000Hz
(+3
dB)
*1
;30—16,000
Hz
40—15,000
Hz
(+3
dB)
*2
;30—16,000
Hz
40—15,000
Hz
(+3
dB)
*3
;30—15,000
Hz
40-—14,000
Hz
(+3
dB)
Surpasses
DIN
45
500
Note:
*1...
SCOTCH
METAFINE
or
Equivalent
*2....
TDK
SA
or
Equivalent
*3
...
MAXELL
UD
or
Equivalent
S/N
ratio
Wow
and
flutter
Crosstalk
Harmonic
distortion
Bias
Erasure
Heads
No.
4192
:
60
dB
(from
peak
level,
weighted,
Metal
tape)
The
S/N
is
improved
by
5
dB
at
1
kHz
and
by
10
dB
above
5
kHz
with
DOLBY
N.R.
on
(DIN
45
500
weighted)
:
0.05%
(WRMS),
0.15%
(DIN
45
500)
:
65
dB
(1
kHz)
:
K3;
0.5%,
THD;
1.0%
(metal
tape,
1
kHz
0
VU)
:
AC
bias
:
AC
erasure
:
2
heads
METAPERM
head
for
recording/
playback
and
2-gap
ferrite
head
for.
erasure
Motor
:
Fast
forward
time
:
Rewind
time
Semiconductors
Input
terminals
Mic
jack
x
2
:
Input
jackx2
;
Output
terminals
Output
jack
x
2;
Phones
jack
x
1
;
DIN
socket
Power
requirement
:
Power
consumption:
Dimensions
Weight
Electronic
governed
DC
motor
95
sec.
with
C-60
cassette
95
sec.
with
C-60
cassette
3
1Cs,
21
transistors,
17
diodes
1
LED
Max.
sensitivity;
0.2mV
(-72
dBs)
Matching
impednace;
6002
—
10k2
Min.
input
level;
80mV
(-20
dBs)
Input
impedance;
100kQ2
Output
level;
300mV
Output
impedance;
5kQ
Output
level;
0.3mW
(822)
Matching
impedance;
BQ
—
1kQ
Min.
input
level;
0.1mV/kQ
Input
impedance;
10kQ
Output
level;
380mV
Output
impedance;
5kQ
AC
240V,
50Hz
(KD-A11A)
AC
240/220/120V,
50/60Hz
(KD-A11
B/C/E/J)
AC
240/220/120/100V,
50/60
Hz
(KD-A11U)
10W
16-1/2"
(420
mm)W
5-1/4"
(134
mm)H
10-3/8"'(264mm)D
9.9
Ibs
(4.5
kg)
Design
and
specifications
are
subject
to
change
without
notice.
me
ee
an,
KD-A11A/B/C/E/J/U
Features
@
Single
lever
4-stage
tape
select
switch
makes
the
KD-A11
are
assured
through
employment
of
IC-built
circuitry.
compatible
with
all
types
of
tape
including
the
new
(Dolby
”*
is
trademark
of
Dolby
Laboratories
Inc.)
metal
Tape
format.
(else
Reduction
System
manufactured
under
Rees)
®
{C-built
Dolby*
Noise
Reduction
System
from
Dolby
Laboratories
Inc.
Dolby
System
greatly
improves
performance
by
cutting
@
METAPERM
head
for
recording/play
back
out
tape
hiss,
without
changing
the
original
music,
thus
2
Gap
ferrite
head
for
erasure
making
it
every
bit
as
good
as
professional
standard
type
©
Automatic
input
select
open
reel
tapes.
High
reliability
and
optimum
quality
Controls
and
Connections
°0
@e8
®@
tweninecy
—
FEC/PLAY
we
outipcay)
R
L
@@O
WU
meters
®
Cassette
operation
buttons.
@
Recording
indicator
(REC)
@4
STOP/EJECT
button
@
Cassette
holder
<<)
REWIND
button
@
Tape
COUNTER/counter
reset
button
oO
Record
button
(REC)
@
POWER
switch
>»
PLAY
button
@
PHONES
jack
>>
FF
button
@
MIC
jacks
1
PAUSE
button
@
REC
LEVEL
controls
@®
Voltage
select
switch
(KD-A11
B/C/E/J/U)
@
TAPE
SELECT
switch
@®
LINE
IN
(REC)
terminals
@
Dolby
noise
reduction
switch
(DOLBY
NR)
@®
DIN
(REC/PLAY)
socket
@®
LINE
OUT
(PLAY)
terminals
@
Power
cord
SAR
us
No.
4192
~
KD-A11A/B/C/E/J/U
Main
Parts
Location
)@
@)
4)
No.
4192
Flywheel/capstan
belt
Auto
stop
solenoid
Motor
Recording
indicator
P.W.B.
Meter
cover
Remote
bar
Power
switch
P.W.B.
Main
Amp
P.W.B.
Recording
spring
Power
Transformer
.
Oiled-gear
damper
assembly
.
Reed
switch
P.W.B.
OANOAIPWNH>
-_—
—
—
N=
(Mechanical
parts)
1.
Pinch
roller
arm
assembly
2.
Pinch
roller
spring
3.
REC/PB
Head
4.
Erase
Head
5.
Pause
switch
6.
Flywheel
7.
Motor
switch
8.
Take
up
reel
disc
ass’y
9.
Supply
reel
disc
assy
10.
Recording
safety
lever
11.
Take
up
idler
assembly
12.
Stop/eject
bar
assembly
13.
Rewind
bar
assembly
14,
Recording
bar
assembly
15.
Play
bar
assembly
16.
Fast
forward
bar
assembly
17.
Pause
bar
assembly
18.
Motor
19.
Flywheel/Motor
bracket
oon
Maintenance
To
get
long,
trouble-free
service,
maintenance
is
important.
Do
not
forget
cleaning
and
demagnetizing.
Cleaning
After
long
use,
the
heads
and
tape
part
—
capstan,
pinch
roller,
etc.
—
will
become
dirty
with
dust
or
magnetic
particles.
Dirty
heads
cause
imperfect
erasing
or
high
frequency
drop-off.
A
dirty
capstan
and
pinch
roller
will
cause
unstable
tape
speed,
leading
to
increased
wow
and
flutter.
Always
keep
them
clean
by
following
the
procedure
below.
1.
Heads
1)
Push
Eject
button
to
open
the
cassette
holder.
2)
Use
the
head
cleaning
stick
provided
to
wipe
the
surface
where
the
tape
comes
into
contact
with
the
head.
(It
is
effective
to
moisten
the
cotton
with
alcohol.)
2.
Pinch
rollar
and
capstan
Do
the
same
method
as
heads.
3.
Cabinet
When
the
cabinet
becomes
dirty,
wipe
it
with
a
soft
cloth
soaked
with
a
neutral
cleaning
solution
of
a
polishing
cloth.
*
Do
not
use
thinner
or
benzine.
1
KD-A11A/B/C/E/J/U
Demagnetizing
The
heads
are
made
from
a
material
resistant
to
magneti-
zation,
but
after
long
use
they
become
magnetized.
A
magnet
brought
into
their
vicinity
can
magnretize
the
heads,
causing
excess
noise.
if
noise
seems
to
have
increased,
demagnetize
the
heads
with
a
head
demagnetizer
through
the
following
procedure.
1.
Turn
the
POWER
switch
OFF.
2.
Wrap
the
tip
of
the
demagnetizer
with
viny!
tape
or
soft
cloth
so
as
not
to
damage
the
head
surface.
Switch
on
the
demagnetizer
and
bring
it
close
to
the
head.
3.
Move
the
tip
of
the
demagnetizer
slowly
first
to
the
left
and
right,
then
up
and
down
in
front
of
the
head.
Gradually
move
it
away
from
the
head
and
switch
it
off
at
a
distance
of
more
than
30
cm.
(12”)
4.
The
erase
head
need
not
be
demagnetized.
The
capstan
shaft
and
tape
guide
should
be
demagnetized
in
the
same
way
as
the
record/playback
head.
Do
not
bring
a
magnetized
metallic
object
(a
screw-
driver,
for
example)
near
the
head
as
this
will
increase
noise.
Removal
of
the
Main
Parts
Observe
care
in
handing
the
parts
since
the
parts
are
small
in
size
and
the
distance
between
them
are
short
due
to
a
deck
design
aimed
mainly
at
compactness
and
high
performance.
Screw
(1)
Lever
Knobs
Control
Knobs
ENCLOSURE
ASSEMBLY
PARTS
Cassette
lid
..........
1)
To
open
the
cassette
lid,
push
on
the
eject
lever.
Remove
a
screw
(1)
fastening
the
cassette
lid.
(its
right
low
side)
Be
careful
of
holding
a
nut.
2)
Pull
off
the
cassette
lid
to
upper
side.
TOP
Cover
.......0-
Remove
6
screws
(left
and
right
.....
3
screws
(2)
on
each)
Control
knobs
(REC
LEVEL)
..........
Pull
off
them
to
forward.
Lever
knobs
(TAPE
SELECT,
DOLBY
NR)
.........-
Pull
off
them
to
forward.
Bottom
cover
..........
Remove
3
screws
fastening
the
bottom
cover.
(center
screw
is
long
size.)
Remove
the
bottom
cover
from
3
pawls
of
mold
chassis.
=
No,
4192
KD-A11A/B/C/E/J/U
|
Front
plate
assembly
..........
Remove
5
screws
(3
screws
(3)
on
upper
side
and
2
screws
(4)
on
bottom
side.)
fastening
the
front
plate
assembly.
(Top
View)
(Bottom
View)
Screws
®
This
screw
is
fastened
with
same
as
earth
wire.
Front
panel
assembly
1.
Remove
a
screw(S)
fastening
the
button
escutcheon
ass’y
(left
side)
2.
Open
the
cassette
holder,
and
remove
a
screw
fastening
the
arm
ass‘y
for
oiled-gear
damper.
3.
Remove
4
screws
(6)
fastening
the
front
panel.
(left
and
right
.....
2
screws
on
each)
4.
Remove
a
washer
and
a
nut
@)
fastening
the
REC
LEVEL
control
VR
shaft.
5.
Remove
a
screw
(8)
fastening
the
lever
switch
on
main
amp
P.W.
Board
ass’y.
(Mechanical
assembly
is
removed
with
the
same
as
front
panel.)
Screws
@)
Washer
and
nut
Screw
Screw
()
MECHANICAL
ASSEMBLY
1.
Remove
the
counter
belt
from
counter.
2)
Remove
4
screws
(Q)
fastening
the
front
plate.
2.
Remove
4
screws
(Q)
fastening
the
front
panel.
(When
assembling
the
mechanical
control
plate,
it
need
a
new
parts
=
the
mechanical
control
plate
cannot
use
If
you
remove
the
mechanical
assembly
with
not
removed
the
front
panel,
do
the
following
method.
1)
Remove
the
mecha
control
plate.
again.)
Screws
@)
Screws
(9)
No.
4192
a
Aten,
ELECTRICAL
PARTS
(Main
amp
P.W.
Board
ass’y)
1)
Remove
a
nut
and
a
washer
fastening
the
REC
LEVEL
control
VR
shaft.
2)
Remove
a
screw
fastening
the
lever
switch.
3)
Remove
3
screws
fastening
the
main
amp
P.W.
Board.
Koa
1A/B/C/E/S/U
4)
Remove
2
plastic
rivets
fastening
the
PIN
jack
assembly.
5)
Remove
the
record
spring.
6)
Remove
4
pawls
for
holding
the
main
amp
P.W.
Board.
Plastic
rivet
paw!
=>
Recording
spring
(Top
View)
@
Supply
disc
assembly
Stop
cover
Take
up
disc
assembly
Lock
bush
Take
up
sping
Gear
base
E
Head
REC/PB
Head}
Pinch
roller
arm
ass‘y
(Front
View)
Take
up
idler
arm
ass’y
:
Ee
Screw
.
=
MECHANICAL
PARTS
1.
REC/PB
head
..........
Remove
a
screw
(1)
Remove
a
screw
(2)
for
adjustment.
2.
Erase
head
..........
Remove
a
ea
Remove
a
screw
()
for
adjustment.
3.
Pinch
roller
arm
ass’y
..........
Remove
an
E-ring
®
holding
its
assembly.
Pull
it
off
from
the
shaft.
4.
Supply
reel
disc
..........
Pull
out
the
reel
disc
stopper
©
and
pull
out
its
disc
from
shaft.
5.
Take-up
reel
disc
..........
Pull
out
the
ree!
disc
stopper
@)
and
remove
the
counter
belt,
pull
out
its
disc
from
shaft.
Note:
(1)
Remove
the
reel
disc
stoppers
with
a
piece
of
sheet
metal
inserted
between
the
reel
disc
and
the
stopper.
(When
assembling
the
reel
disk,
the
stopper
need
a
new
parts.
(the
stopper
can
not
use
again.)
(2)
Be
careful
not
to
stain
the
counter
belt.
No.
4192
KD-A11A/B/C/E/J/U
(8)
Screws
Rubber
stopper
\
aT
Set
screw
dQ
Screws
(Rear
View)
9?
3
screw
es
3
cushions
1.0mm
+£0.2mm
Gear
frame
ass‘y
aa
Brake
drum
a
Rack
plate
~
E
(4)
@—
Of
a
No.
4192
,
o
D
assy
Flywheel
assembly
1.
Remove
3
screws
(8)
and
a
set
screw
(Q)
fastening
the
flywheel
and
motor
bracket.
2.
Remove
a
capstan
belt.
3.
Remove
3
screws
fastening
the
capstan
metal.
4.
Remove
the
pressure
lock
bushing
and
the
take
up
spring
on
front
side,
and
then
remove
the
take
up
idler
arm
assembly.
5.
Remove
the
pressure
position
of
stopper
cover,
and
move
the
gear
base
to
supply
disc
direction,
and
then
remove
the
gear
base
tip
from
the
groove
of
capstan
metal.
6.
Pull
off
the
flywheel
assembly.
Note:
When
assembling
the
flywheel,
fasten
the
screws
after
assembled
the
chassis
to
the
groove
of
capstan
metal.
Motor
1)
Remove
a
screw
fastening
the
rubber
stopper.
2)
Remove
the
capstan
belt
from
the
motor
pulley.
3)
To
remove
the
motor,
turn
it
in
counter-
clockwise
direction
and
pull
it
out
backward
(with
3
cushions
and
3
screws
for
fastening
the
motor).
Note:
When
replacing
the
motor,
check
the
following
points.
(1)
Is
the
motor
placed
in
correct
position?
(Don’t
make
the
motor’s
position
deflective.)
(2)
Does
the
capstan
belt
run
in
the
center
of
the
motor
pulley?
DOOR
BRAKE
AND
ITS
RELATED
PARTS
1.
Gear
frame
ass’y
.......
2.
Brake
arm
and
tire
spring
@.
3.
Spur
gear
and
brake
drum
spring
@).
4.
Rack
plate
.......
Remove
the
screw
and
the
collar
@).
5.
Brake
lever
ass’y
.......
Remove
the
E-ring
©.
Remove
a
screw
@.
wasters
Remove
the
E-ring
and
torsion
Remove
the
E-ring,
and
PB,
etn
Main
Adjustments
[1]
1.
[11]
Equipment
and
measuring
instruments
used
for
adjustment.
Electrical
adjustment
1)
Electronic
voltmeter
2)
Audio
frequency
oscillator
(range;
50-20
kHz
and
output
0
dB
with
impedance
600
&2)
3)
Attenuator
4)
Standard
tapes
for
REC/PB
SONY
CS-30
—
FeCr
tape
BASF
T308S
—
NORMAL
tape
BASF
C401R
—
CrO2
tape
SCOTCH
METAFINE
—
METAL
tape
5)
Reference
tapes
for
playback
(JVC
Test
Tape)
VTT-658
(for
head
azimuth
adj.)
VTT-656
(for
motor
speed,
wow
flutter
adj.)
VTT-664
(for
Reference
level
1
kHz)
VTT-675N
(for
playback
frequency
response)
6)
Resistors
100
22
(for
measurement
of
the
bias
current)
600
{2
(for
attenuator
matching)
or
equivalent
.
Mechanical
adjustment
1)
Gauge
for
checking
the
head
position.
2)
Torque
gauge
3)
Blank
tape
(C-120)
for
tape
running
checker.
Adjustment
and
repair
of
the
mechanism
Audio
Freq.
Osc.
La
KD-A11A/B/C/E/J/U
Electronic
Voltmeter
_,
Attenuator
oe
S304
“13
6000
OUT/PUT
(Adjust
the
mechanism
or
confirm
that
it is
in
normal
Operating
condition
prior
to
the
adjustment
of
the
electrical
circuit.)
Adjusting
record/
playback
head
position
Adjusting
erase
head
height
.
Connect
an
electronic
voltmeter
to
the
LINE
OUT
terminals.
2.
Play
back
the
VTT-658
test
tape.
3.
Adjust
the
head
angle
with
the
screw
(@)
until
the
reading
of
the
electronic
voltmeter
becomes
max-
imum
for
both
channels.
4.
After
adjusting,
set
the
screw
with
screw
bond.
Tape-to-head
contact
adjustment
1.
Turn
the
adjusting
screw
for
aligning
the
erase
head
until
it
stops.
Then,
turn
the
screw
in
the
re-
verse
direction
by
180°
(a
%
revolu-
tion).
2.
Employ
a
special
cassette
(C-120)
©
from
which
parts
to
the
casing,
where
the
erase
head,
record/play
back
head
and
capstan
engage,
has
been
cut
away.
Perform
tape
trans-
port
with
the
cassette
tape.
Adjust
the
screw
until
the
tape
runs
in
the
center
of
the
egase
head
tape
guide.
3.
Check
it
again
with
a
BASF
C401R-
CrOQ2
tape.
Checking
method:
Record
a
400
Hz
or
1
kHz
signal
with
OVU+20dB.
Erase
the
record-
ing.
Check
if
the
erasing
is
satisfac-
torily
performed.
4.
After
adjustment,
apply
screw
bond
on
the
adjusting
screw
to
prevent
its
loosening.
Proper
Tape
guide
EF
Improper
ct
Screw
®
Maximum
|
1.
If
the
head
is
worn,
disconnected
or
exceedingly
magnetized
so
as
not
to
provide
the
necessary
characteris-
tics,
replace
it
with
a
new
one.
After
replacement,
the
head
posi-
tion
adjustment
as
well
as
the
play-
back
level
adjustment,
the
bias
cur-
rent
adjustment
and
the
recording
level
adjustment
are
all
necessary.
2.
If
the
output
difference
between
the
left
and
right
channels
exceeds
3—4
dB,
the
head
is
defective.
Replace
it
with
a
new
one.
Be
sure
to
perform
this
adjustment
after
replacing
the
erase
head.
KD-A11A/B/C/E/J/U
|
Adjusting
|
Standard
point
value
Adjusting
motor
Connect
a
speed
meter
to
the
LINE
Semi-fixed|
3000
Hz_
|
If
the
speed
meter
functions
as
a
wow
speed
OUT
terminals.
Play
back
the
VTT-
resistor
in
and
flutter
meter,
also,
connect
the
656
test
tape
Adjust
the
semi-fixed
the
motor
deck
to
the
INPUT
terminals
of
the
resistor
in
the
motor
until
the
read-
meter.
ing
of
the
speed
meter
is
3000
Hz.
Checking
play-
Employ
a
torque
testing
cassette
tape
If
the
standard
torque
is
not
obtained,
back
torque
for
the
checking,
or
remove
the
cas-
replace
the
take-up
reel
disc
assembly.
sette
cover
and
use
a
torque
gauge.
Checking
fast
Measure
the
torque
in
the
fast
forward
More
than
|
If
the
standard
torque
is
not
obtained,
forward
torque
mode
in
the
same
manner
as
in
the
80
gr-cm
|
perform
the
following.
above.
1.
Clean
the
capstan
belt,
the
idler
cir-
cumference,
the
motor
pulley,
the
take-up
reel
disc
circumference,
the
flywheel
circumference,
etc.
.
Replace
the
capstan
belt
or
idler
ass’y.
Checking
rewind
Measure
the
torque
in
the
rewind
More
than
|
If
the
standard
torque
is
not
obtained,
.
torque
mode
in
the
same
manner
as
in
the
80
gr-cm_
|
clean
the
capstan
belt,
idler,
motor
above.
pulley,
flywheel
circumference,
supply
reel
disc
circumference,
etc.
[111]
Repair
of
wow
flutter
If
wow
and
flutter
increase,
check
the
following
points.
If
tions.
there
is
defect
in
revolving
parts,
the
wow
and
flutter
gener-
Play
a
3000
Hz
test
tape,
and
defective
part
can
be
detected
ated
will
increase
in
proportion
to
the
number
of
revolu-
from
the
sound.
Replace
flywheel.
Clean
the
capstan
shaft
in
the
flywheel.
Replace
the
capstan
assembly.
Capstan
shaft
has
excessive
run-out.
Flywheel!
turns
heavily.
(shaft
seisure,
thrust
play,
etc.)
Pinch
roller
Rough
rotation
(Deformation
scratches,
|
Replace
pinch
roller,
or
pinch
roller
spring.
or
dust)
Clean
the
pinch
roller.
The
angular
position
of
the
pinch
roller
|
Adjust
the
pinch
roller
so
that
it
is
parallel
with
the
capstan
shaft.
is
not
correct.
The
pinch
roller
pressure
is
not
correct.
Belt
Belt
has
undue
run-out.
Check
the
belt.
Belt
is
dirty
or
slippery.
Replace
the
belt.
Back
tension
|
Back
tension
is
irregular,
or
back
ten-
Replace
back
compression
spring
(under
supply
disc).
sion
is
too
strong.
Motor
Motor
shaft
has
undue
run-out.
Replace
motor.
Motor
pulley
is
oily
and
dustry.
Clean
motor
pulley.
Capstan
and
flywheel
No.
4192
—10—