JVC QL-A2 User manual

JVC
MODEL
OL:-A2
QUARTZ
AUTO-RETURN
TURNTABLE
No.2444
JAN.
1978

QL-A2
No.
2444
Contents
Page
1.
Specifications
0...
ec
ee
ee
ee
ee
eee
ee
eee eee
en
eee
ees
2
2:
Service:
Precautions:
sos.
oe
Sieis5
Fae
ae
eek
BE
ee
ace
Reber
e
ee
se
Sw
Senge
lig)
a
Tee
ial
tile
3
SER
OAtures
coe
555.
cos
et
Pats
ce
Seedech
ee
eels
eta
iat
hts
Gorn
oactarses
ante
vale:
Wife
ee
Saree
Hayenas
raises
ah
oe
sagen
3
4.
‘How
to
Operate’
(Names
and
Functions)
.........
000.
eee
e
tenes
3
5.
Operation
of
Automatic
Mechanism
...
2...
0 6
ce
eee
teenie
ee
4
6.
Block
Diagrams
6-(1)
Servomotor
Control
System
.......0
2
2c
ee
ee
eee
ees
5
6-(2)
{C802
Integrated
Circuits
and
Waveforms
.........2
0002
cect
ene
ener
eee
5
7.
Troubleshooting
7-(1)
Platter
does
not
rotate...
0...
eee
eee
eee
ener
eee
6
7-(2)
Platter
rotates
at
high
speed
..
1.2.2...
ee
cc
ee
et
eens
7
7-(3)
Rotation
is
not
locked
to
the
crystal
oscillator
frequency
.........2
0+.
ee
ee
ene
7
8.
Cartridge
Replacement
..........
0.
cece
eee
ee
ee
ee
eee
tees
8
9.
Adjustment
Procedures
Servomotor
Control
Section
9-(1)
Power
Supply
Voltage
Check
.........
:0
cece
eee
eee
eee
e
eee
8
9:(2)'
Lock:
Akiuistenie
nt
35.26:
a5
55
Seite
S55
ete
cw
ey
oriasies
ead
Sey
leer
e
sora SOUR
ale
eae
Sa
8
Tonearm
Section
9-(3)
Overhang
Adjustment
......
0...
0c
ec
ee
ee
ee
et
ee
tee
eee
9
9-(4)
Tonearm
Lifter
Height
Adjustment
..---
02-00
cece
ee
ens
9
9-(5)
Auto-return
(Lead-out)
Adjustment...
2.0.60.
eee
teens
9
9-(6)
Tracking
Force
Adjustment
............
00.
cece
eee
eee
eee
eee
10
9-(7)
Anti-skating
Adjustment
....
0.2...
00.
eee
eet
eee
10
10:
Lubrication
=...
iene
ee
tiie
ees
te
eee
ao
Wie
Wh,
BAS
a
Rae
Bee
ee
ee
Se
11
11.
Exploded
Views
and
Parts
List
11-(1)
Cabinet
and
Mechanism
Assembly
..........00
0
eee
eee eee
ee
eee
eee
11
11-(2)
Mechanism
Base
Assembly
.............
0.
eee
eee
ee
eee
te
eens
13
11-(3)
Knob
Base
Assembly...
2...
0...
ccc
ee
eee
een
ee
eens
13
11-(4)
Tonearm
Assembly
.......0.
0.00
cece
eee
eee
eee
ee
eee eee
eee
14
11-(5)
Parts
List
with
Specified
Numbers
for
Designated
Areas........-.----0220200-
14
12.
Connection
Diagram
of
TXX-124
2.2...
ce
ee
ee
ee
eee
ene
15
13.
TXX-124
Schematic
Diagram
..
0...
06.
ce
eee
ee
ee
eee
eee
16
14.
TXX-124
Printed
Circuit
Board
Ass’y
and
Parts
List...
2.2...
ce
ee
ee
17
15.
Packing
Materials
and
Part
Numbers
...
0...
0.
eee
ec
ee
eee
ee
ee
ee
eee
ee
21
AG.
Accessories
EASE,
<2.
sic
o.scechcecce
eb
sok,
laa
8
aie
ee
es
ese
othe
Soe
pera
ee
ace
&
a
ad
21
17.
QL-A2:
Schematic:
Diagraint
22.55:
euc
ols
aleca
en
tes
a
hee
R)
aca
wee)
le
8
Dew
eee
Bla
eae
Ss
be
22
CHECKING
YOUR
LINE
VOLTAGE
(For
U.S.
Military
Market
and
Other
Countries)
Before
inserting
the
power
plug,
please
check
this
setting
to
see
that
it
corresponds
with
the
line
voltage
in
your
area.
If
it
doesn’t,
be
sure
to
adjust
the
voltage
selector
switch
to
the
proper
setting
before
operating
this
equipment.
The
voltage
selector
switch
is
located
either
on
the
set’s
on
the
chassis.
Simply
insert
a
screw
driver
into
the
voltage
selector
switch
and
turn
it
in
either
direction
while
pressing
slightly
and
in
such
a
way
that
desired
voltage
marked
on
the
switch
is
positioned
underneath
the
arrow
.
marked
on
the
rear
panel
or
the
chassis.
The
voltage
selector
switch
accommodates
up
to
three
turns
in
either
direction.

1.
Specifications
Motor
section
Motor
Drive
system
Speeds
Wow
and
flutter
Rumble
Speed
detection
Starting
torque
Speed
deviation
Load
characteristics
Drift
per
hour
Power
characteristics
Temperature
characteristics
Platter
Tonearm
section
Type
Effective
length
Tracking
error
Overhang
Tracking
force
range
Weight
range
(including
headsheil)
:
Coreless,
DC
type
FG
servomotor
:
Direct
drive
:
33-1/3
and
45
rpm
:
Less
than
0.025
%
(WRMS)
:
More
than
62
dB
(IEC-B)
More
than
72
dB
(DIN-B)
:
Integrated
frequency
generator
:
More
than
650
g-cm
:
Within
0.004
%
:
0
%
(with
100
g
total
tracking
force)
:
0.0001
%/H
:0%
(410
%
V)
:
0.00005
%/°C
:
31.2
cm
diameter
:
T.H.
(Tracing-Hold
system,
static
balance}
:
220
mm
:
+3°35'
-0°43'
:
15mm
:
0
—3g
(0.25
grams
division,
direct
reading)
:
14.5
—
21
g
(Headshell
10
g)
Cartridge
section
(not
provided
on
units
for
U.S.A.,
Canada
and
the
U.K.)
Type
Stylus
Optimum
tracking
force
Output
Frequency
response
Separation
Load
resistance
Compliance
General
Dimensions
Weight
Power
Specifications
U.S.A.
&
CANADA
CONTINENTAL
EUROPE
U.K.
&
AUSTRALIA
U.S.
MILITARY
MARKET
OTHER
AREAS
:
Moving
Magnet
(Cartridge
body:
MD-1025)
:
0.5
mil.
diamond
(DT-Z1S)
:
2
grams
:
3
mV
(1
kHz)
:
10
to
25
000
Hz
:
More
than
25
dB
(1
kHz)
(with
test
record
TRS-1)
:
47
kilohms
—
100
kilohms
:
10
x
10%
cm/dyne
(Dynamic)
30
x
10°
cm/dyne
(Static)
:
14.7(H)
x
46.0
(W)
x
36.5(D)
cm
(with
cover
closed)
(5-13/16"
x
18-1/8"
x
14-3/8”)
(Since
the
dimensions
show
only
the
design
measurements,
consideration
is
required
when
installing
the
unit
in
a
limited
space
such
as
a
rack.)
:
6.5
kg
(14.3
Ibs)
(without
corrugated
cardboard
case)
AC
120
V,
60
Hz
9
watts
AC
220
V~,
50
Hz
AC
240
V~,
50
Hz
AC
110,
120,
220,240
V
Selectable,
50/60
Hz
AC
110,
120,220,240
V
Selectable,
50/60
Hz
9
watts
9
watts
9
watts
9
watts
QL-A2
No.
244
j
i
2

3.
Features
Quartz-locked
speed
contro!
system
DC
type
FG
servomotor
Quartz-locked
one-row
stroboscope
Oil-damped
cueing
Anti-skating
mechanism
2.
Service
Precautions
1.
Be
sure
to
place
the
unit
on
a
level
surface
when
adjust-
ing
motor
rotation.
2.
In
servicing,
do
not
use
parts
other
than
those
specified.
3.
Be
careful
not
to
damage
the
motor
shaft
when
repairing
the
motor
unit.
4.
When
the
heat
sink
(including
X815)
is
removed
from
the
motor
board
to
permit
repair
of
the
circuit
board,
the
transistor
temperature
may
increase
due
to
the
lack
of
heat
radiation.
4.
“How
to
Operate’’
(Names
and
Functions)
EP
adaptor
Place
this
adaptor
onto
the
center
spindle
when
you
play
a
record
with
a
bigger
center
hole
such
as
a
doughnut
record.
Anti-skating
knob
This
device
cancels
out
the
centripetal
force
that
pulls
the
tonearm
to
the
center
of
the
platter.
This
prevents
the
stylus
tip
from
skating
toward
the
center
of
the
platter
and
at
the
same
time
elimi-
nates
any
excessive
stylus
tip
force
on
the
inner
wall
of
the
record
groove.
Use
the
@
marked
dial
when
employing
a
spherical
stylus.
Use
the
a
marked
dial
when
employing
an
ellipti-
cal
stylus
or
a
Shibata
stylus.
Turn
the
dial
to
the
same
number
as
the
tracking
force
dial.
Speed
select
knob
Select
a
proper
position
of
the
speed
select
knob
in
accordance
with
the
rpm
of
the
record.
33-1/3
rpm
record
(LP)
"33°"
45
rpm
record
(EP)
Tonearm
lifter
lever
This
is
used
when
you
want
the
tonearm
gently
lifted
up
or
lowered
down.
When
you
pull
it
to
“UP”
position,
the
tonearm
will
be
lifted
up,
and
when
you
push
it
to
“DOWN”
position,
it
will
be
lowered
down
gently
onto
the
record
surface.
Stroboscope
pattern
Reject
lever
QL-A2
No.
2444
A
single
stroboscope
pattern
is
equipped
on
the
rim
of
the
platter.
When
the
turntable
rotates
at
either
33-1/3
or
45
rpm,
the
striped
pattern
will
appear
stationary
to
indicate
that
the
turntable
speed
is
correct.
When
you
stop
playing
the
record,
push
the
lever
in
the
direction
of
arrow
toward
“REJECT”
and
release
it.
The
lever
returns
to
its
original
position
and
the
tonearm
lifts
itself
up,
returns
automat-
ically
to
its
rest
and
the
platter
stops
rotatings.

5.
Operation
of
Automatic
Mechanism
Change
cycle
mechanism:
projection
1.
During
playing,
the
notch
of
the
main
gear
position
relative
to
the
turntable
spindle
gear
is
as
shown
in
Fig.
2.
As
the
projection
is
away
from
the
engagement,
the
main
gear
does
not
rotate
even
though
the
turntable.
2.
As
playing
proceeds,
the
trip
slide
moves
toward
the
center
of
the
turntable
following
the
movement
of
the
tonearm
as
shown
in
Fig.
3.
Engagement
Platter
spindle
gear
3.
The
engagement
is
very easy
to
move
as
it
simply
rests
Platter
gear
on
the
lower
trip.
On
the
music
section
of
the
record
groove
the
engagement
moves
so
slightly
that
it
is
Fig.
2
returned
by
the
tip
of
the
projection.
Censequently,
the
turntable
spindle
gear
does
not
engage
with
the
main
gear
and
thus
does
not
trigger
the
auto-return
operation.
4.
When
playing
ends
and
the
pick-up
cartridge
enters
the
lead-out
groove
which
is
spaced
out,
the
engagement
advances
more
then
it
is
returned
by
the
projection.
Because
of
this,
the
engagement
is
pressed
by
the
projection
as
shown
in
Fig.
4,
causing
the
main
gear
to
turn
and
engage
with
the
turntable
spindle
gear.
Thus
the
change
cycle
is
started.
5.
During
the
return
operation
the
engagement
and
lower
trip
which
have
moved
are
returned
to
their
original
position
by
the
reject
lever
coming
into
contact
with
the
Fig.
3
Fig.
4
bottom
of
the
lower
trip.
At
this
moment
the
switch
lever
operates
with
the
help
of
the
main
gear
cam,
switching
off
the
power
just
before
the
rotation
should
stop.
This
completes
the
automafic
cycle.
Tonearm
lift
and
return
mechanism:
1.
When
the
main
gear
starts
to
rotate
at
the
end
of
playing,
the
return
lever
rotates
under
the
action
of
the
main
gear
cam
to
press
the
elevator
cam.
The
upward
movement
of
the
elevator
cam
is
directly
converted
into
movement
ofthe
elevator,
lifting
up
the
tonearm.
(Fig.
5)
2.
The
tonearm
is
returned
by
the
arm
lever
the
end
of
which
presses
it
as
the
main
gear
rotates.
(Fig.
6)
Return
lever
Trip
Slide
Elevator
cam
Fig.
5
Arm
Lever
Fig.
6
QL-A2
=4s
No.
244

6.
Block
Diagrams
6-(1)
Servomotor
Control
System
Platter
Light
emitting
diode
4
Waveform
shaper
Frequency
generator
50
Hz
(at
33-1/3
rpm)
LED
67.5
Hz
(at
45
rpm)
indicator
circuit
Power
switch
sn
.
Power
Motor
drive
:
z
circuit
aoe
9.504
MH
supply
B35
ae
hee
circuit
+e
_—
|
ous
Speed
select
signal
AC
Fig.
7
6-(2)
IC802
Integrated
Circuits
and
Waveforms
Yss
Po
P)
P2
P3
Ps
P5
Pé6
P7
20/27
DO
oppo
ee
ar
”
Lt
et
otf
SM64I5A-4
(i
Se
Ue
65
10
STAGE
PROGRAM
COUNTER
—_———
:
*
}
|
ogy]
ea
20V
ST
ots
20mS
Input
Fig.
10
Waveforms
(Pin
1
through
Pin
11)
F/V
section
Waveform
at
pin
4.
5v
FYs
FVc
FY
PDs
PDs
PDc
Fig.
8
Block
Diagram
i
\
i
Waveform
at
pin
5,
¥
’
TOP
VIEW
-—
—
jes
vool
lo
vss
;
ea
=
!
QIN
PO
!
|
Waveform
at
pin
7.
H
SOUT
mre
|
teal
FG
IN[
|
r
|p2
a
Approx.
2.0
V
at
33-1/3.
—
FVS
2
2
P3
-
5
7
rve(
g
3
A
P/D
section
=
oO
—
7
1
FV
a
i
P5
Waveform
at
pin
8,
|
;
=)
ho
2
PDS
&
oO
[Jes
:
=a
c=
|
PDB
P?
—4
t=
+
PDC
ST
Waveform
at
pin
11
|
t
=]
Kk
:
|
V2-V6s2
PPh
20/27
Approx.
1.37
V
at
33-1/3.
Be
sure
to
obtain
:
the
waveform
DATECODE
at
pin
13
through
|
Fig.
9
Pins
Location
Ree
Ororhesiele
Deviation
at
lock
adjustment
damaged.
(this
should
be
within
+
7
msec.)
Fig.
11
Waveforms
(F/V
and
P/D)
QL-A2
No.
2444
-5-

7.
Troubleshooting
7-(1)
Platter
does
not
rotate
Platter
does
not
rotate.
ts22;05V
available
at
TP-5
when
the
Power
switch
is
turned
on?
Yes
No
Is
a
voltage
present
at
the
collector
of
transistor
X815?
Yes
No
Is
an
AC
voltage
present
,
Yes
between
lapping
tabs
7
—
8.
No
Fuse
or
transformer
dis-
connected.
AC
cord
solder-
ing
defective.
Transistor
X815
—
X817
or
diode
D809
defective.
Diode
D810
—
D813
open
or
incorrectly
soldered.
Hall
elements
open.
Motor
disconnected
inside,
dis-
connected
resistors.
Does
the
platter
rotate
when
R822
is
short-circuited?
Yes
No
Does
the
platter
rotate
when
pins
1
and
8
of
IC
803
are
short-circuited?
Yes
No
Does
platter
rotate
when
emitter
and
collector
of
transistor
X803
are
short-circuited?
Does
platter
rotate
by
hand?
fs
output
available
at
voltage
terminals
of
Hall
elements
HG-1
and
HG-2?
Does
platter
rotate
when
pins
6
and
1
of
IC802
are
short-circuited?
IC802
defective.
1C803
defective.
Transistor
X803
is
open
be-
tween
emitter
and
collector.
Transistors
X805
—
X812
defective.
Lead
from
circuit
board
to
motor
discon-
nected.
Check
for
loose
socket,
floating
pattern
and
defective
soldering.
.
Check
for
incorrect
ca-
is
the
oscillation
waveform
pacitance
or
defective
solder-
available
at
TP-3?
ing
of
IC801.
1s
diode
D801
or
capacitor
C808
not
defective?
Yes
Replace
defective
part.
Notes
for
replacement
of
transistors
X809
—
X812
There
are
4
ranks
K1,
K2,
L1
and
L2
for
2SD571
transistor
hfe.
Be
sure
to
use
those
transistors
of
the
same
ranking
when
replacing.
Warning
!
1.
Be
careful
not
to
allow
metallic
dust,
etc.
to
enter
inside
the
unit,
be
cause
its
motor
is
comprised
of
magnetic
elements.
2.
After
replacement
of
the
X813
transistor,
apply
KE45RTV
(silicone
adhesive)
or
an
equivalent
material
around
the
transistor
for
thermal
con-
duction.
QL-A2
No.
2444

7-(2)
Platter
rotates
at
high
speed
Platter
rotates
at
high
speed.
Does
rotation
stop
when
pin
1
of
1C803
is
connected
to
ground?
Does
rotation
stop
when
+22.0
V
is
applied
to
the
collector
of
transistor
X803?
Transistor
X804
or
X813
is
short-circuited
between
collector
and
emitter.
7-(3)
Rotation
is
not
locked
to
the
crystal
oscillator
frequency
Rotation
is
not
locked
to
the
crystal
oscillator
frequency.
Are
the
pulse
rectanguler
waveforms
of
50 Hz
and
67.5
Hz
available
at
pin
5
of
'C803?
Yes
No
Is
the
9.504
MHz
oscillation
voltage
present
at
pin
3
of
1C802?
Yes
No
Check
IC802
for
defect,
C806
or
C807
for
discon-
nection
or
pattern-cut.
OL-A2
No,
2444
Apply
+22.0
V
to
the
col-
lector
of
transistor
X803
and
stop
operation
of
the
drive
circuit.
Transistor
X803
is
short-
circuited
between
collector
and
emitter.
ls
adjustment
with
VR801
or
VR802
effective?
Yes
Readjust
following
justment
procedure”.
C814,
R820
or
C802
defective.
Replace.
Is
FG
output
6
MVp-p
present
Y
when
the
platter
is
rotated
=
by
hand
at
about
33-1/3
rpm?
No
Broken
connecting
wires
or
faulty
soldering.
Check
for
broken
patterns
No
or
faulty
soldering
Is
about
normal
rotation
obtained
with
R818
removed?
No
Yes
C811,
D802, C813,
R817
or
IC802
defective.
1s
5.8
Vp-p
output
present
at
pin
7
of
IC801
when
the
platter
is
rotated
by
hand
at
about
33-1/3
rpm?
No
i
eer
8
ts
22.0
V
available
at
pin
8
of
IC801.
Are
C809, C810,
VR801
and
VR802
correctly
employed?
No
Yes
Replace.
ts
the
rectangular
waveform
of
22
V
at
pin
1
of
1C801
available
when
the
platter
is
rotated
by
hand
at
about
33-1/3
rpm?
Yes
No
Check
for
defettive
[C801
or
incorrect
capacitance
of
C803.
Defective
!C801,
incorrect
capacitance
of
C801
or
open
R803
may
be
the
cause.
Is
the
waveform
Yes
present
at
TP-3
as
shown
in
wiring
diagram
1?
No
ts
FG
output
as
specified?
Is
5.8
Vp-p
present
at
pin
7
of
1C801?
Yes
No
Check
motor
or
replace
1C801.
rectangular
waveform
of
4.6
V
at
TP-3
available
when
the
platter
is
rotated
by
hand
at
about
33-1/3
rpm?
Yes
No
Check
for
broken
pattern
or
faulty
soldering
of
R808
and
R809.
Check
connection
or
solder-
ing
of
1C802.
1C801
defective.
DC2.1
V
availabié
available
at
pin
1
of
at
pin
7
of
IC802
when
Yes
1C803
when
the
platter
Yes
the
platter
rotated
by
hand
.
at
about
33-1/3
rpm?
is
rotated
by
hand
at
pm
about
33-1/3
rpm?
No
No
Check
for
defective
!C802,
Check
for
defective
1C803,
short-circuited
or
open
IC
short-circuited
or
open
!C
leads.
leads.
Normal
Warning
!
1.
Be
careful
not
to
allow
metallic
dust,
etc.
to
enter
inside
the
unit,
be
cause
its
motor
is
comprised
of
magnetic
elements.
2.
After
replacement
of
the
X813
transistor,
apply
KE45RTV
(silicone
adhesive)
or
an
equivalent
material
around
the
transistor
for
thermal
con-
duction.

8.
Cartridge
Replacement
.
Unscrew
the
connector
nut
to
remove
the
headshell.
2.
Remove
the
two
long
screws
on
the
headshell
which
hold
the
cartridge.
3.
Connect
the
lead
wires
of
the
headshell
to
the
new
cartridge,
being
careful
to
match
the
polarities
correctly.
Polarity
and
wire
colors
are
as
follows:
White
(+)
....L
Red
(+)......
R
Blue
(-)
.....
LE
Green(-)
....
RE
4.
Attach
the
cartridge
to
the
headshell
squarely,
and
gently
tighten
the
screws.
5.
Set
the
cueing
lever
to
“DOWN”,
and
then
bring
the
stylus
tip
to
the
overhang
indicator
by
sliding
the
cartridge
back
and
forth.
After
the
adjustment,
fix
it
firmly.
6.
After
attaching
the
cartridge,
slide
the
headshell
into
the
tonearm
with
the
connector
pin
fitting
in
the
groove.
Tighten
the
connector
nut.
_
9,
Adjustment
Procedures
7.
Be
sure
to
adjust
the
tracking
force
and
lead-in
position
after
replacing
the
cartridge.
Screw
Plastic
washer
?
4
A
Headshell
R
“—
Cartridge
pin—___
{4
Cartridge
body
~~
!
ue
Stylus
_
Groove
Connector
pin
Headshell
Connector
nut
Fig.
12
Fig.
13
Servomotor
Control
Section
9-(1)
Power
Supply
Voltage
Check
1.
Disconnect
the
motor
socket
from
the
circuit
board.
Turn
the
power
switch
on.
(Confirm
that
the
rated
voltage
is
applied
to
the
unit.)
Confirm
that
22
+0.5
V
DC
is
present
at
TP-5.
If
the
voltage
is
deviate
from
that
range,
adjust
with
the
semi-fixed
resistor
VR803
(1
k{2).
2.
Confirm
that
the
voltage
difference
at
TP-5
is
less
than
-1V
when
the
platter
is
stalled
with
hand.
9-(2)
Lock
Adjustment
1)
With
dual
beam
oscilloscope
1.
Connect
the
motor
socket
to
the
circuit
board.
Connect
the
dual
beam
oscilloscope
to
TP-3,
TP-4.
Obtain
a
turntable
speed
of
45
rpm
by
setting
the
speed
select
switch
to
45
and
turn
the
power
switch
on,
then
adjust
the
semi-fixed
resistor
VR802
(100
k{Q2)
until
the
follow-
ing
waveforms
are
obtained.
14.8
ms
(20ms)
ee
Fig.
14
Adjust
to
get
a
difference
of
within
+
1
msec
from
TP4.
2.
Obtain
a
turntable
speed
of
33-1/3
rpm
by
setting
the
speed
select
switch
to
33-1/3,
then
adjust
the
semi-
fixed
resistor
VR801
(47kQ)
until
the
difference
between
TP-3
and
TP-4
is
within
+
1
msec.
2)
With
single
beam
oscilloscope
Connect
the
single
beam
oscilloscope
to
TP-3,
TP-4
as
shown
in
Fig.
15
below.
Adjust
until
the
waveforms
shown
in
Fig.
16
are
obtained.
The
allowable
deviation
for
adjustment
should
be
within
1
msec.
as
shown
in
Fig.
16,
Fig.
17.
Connection
diagram
Ma
imMn
TPS
TP-3
Precaution
if
the
measurement
As
of
TP-3
is
required,
connect
the
output
of
test
equipment
to
TP-3
through
10
kQ
resistor.
Single
beam
oscilloscope
Within
1
msec
Fig.
15
Fig.
16
Ov
Within
1
msec
=e
Fig.
17
Ov
QL-A2
No,
244
F
;
4

Tonearm
Section
Adjustment
The
following
adjustments
should
be
performed
only
when
replacing
a
cartridge
or
a
headshell.
Otherwise,
no
adjustment
is
required.
Note:
If
necessary
to
replace
a
cartridge,
usage
of
that
headshell
exclusive
to
this
unit
is
recommended.
9-(3)
Overhang
Adjustment
Loosen
the
stylus
mounting
screws
and
slide
the
cartridge
to
adjust
the
stylus
tip
position
so
that
tip
is
coming
just
over
the
overhang
indicator.
(See
Fig.
18.)
Overhang
indicator
9-(4)
Tonearm
Lifter
Height
Adjustment
Adjust
the
height
of
tonearm
lifter
with
the
adjustment
“ah
screw
so
that
the
distance
between
the
stylus
tip
and
the
Fo
surface
of
record
is
about
6
mm
when
the
stylus
is
elevated.
Turn
the
height
adjustment
screw
clockwise
to
lower,
and
counterclockwise
to
raise
the
tonearm
lifter
level.
(See
Fig.
19.)
9-(5)
Auto-return
(Lead-out)
Adjustment
When
the
pulley
has
been
replaced
for
a
different
record
or
Pick-up
Shaft
if
auto-return
functions
early,
adjust
as
shown
in
Fig.
20.
—
When
change
cycle
starts
too
late,
turn
the
screw
counterclockwise
with
a
screwdriver.
—
When
change
cycle
starts
too
early,
turn
the
screw
clockwise.
Driver
Adjustment
Screw
Trip
Slide
OL-A2
No.
2444
=i:
Fig.
18
Adjustment
screw
Fig,
19
Fig.
20

9-(6)
Tracking
Force
Adjustment
1.
Set
the
anti-skating
knob
to
the
‘’0’’
mark
on
the
dial.
7.
Return
the
tonearm
to
the
rest
and
clamp
it.
2.
Place
an
unwarped
disc
onto
the
platter.
8.
Hold
the
counterweight
at
the
adjusted
position
and
turn
3.
Remove
the
stylus
cover
from
the
stylus.
the
tracking
force
dial
until
the
0’
mark
is
aligned
with
4.
Release
the
tonearm
clamp.
the
index
line
on
the
tonearm
weight
shaft.
5.
Turn
the
counterweight
until
the
tonearm
is
balanced.
Turn
the
counterweight
in
the
B
direction
until
the
“2”
6.
Stop
turning
the
counterweight
when
the
stylus
tip
is
mark
on
the
dial
is
aligned
with
the
index
line
for
the
almost
touching
the
disc
surface.
model
preparing
cartridge
Z-1S.
Counterweight
Index
line
Stylus
protector
Counterweight
Tracking
force
diai
Fig.
21
9-(7)
Anti-skating
Adjustment
Adjust
the
anti-skating
force
according
to
the
cartridge
used.
Turn
the
anti-skating
knob
dial
to
the
same
number
on
the
tracking
force
dial.
Use
the
@
marked
dial
when
employing
a
spherical
stylus.
Use
the
eg
marked
dial
for
an
elliptical
or
a
Shibata
stylus.
Set
the
‘’2"’
of
the
©
marked
dial
to
the
index.
line
since
the
QL-A2
is
provided
with
a
spherical
stylus
and
the
tracking
force
has
been
adjusted
to
2
g.
Fig.
22
Index
line
Antis
kating
knob
QL-A2
-10-
No.
24:

10.
Lubrication
The
direct
drive
motor
employed
in
this
unit
does
not
require
the
lubrication.
11.Exploded
Views
and
Parts
List
11-(1)
Cabinet
and
Mechanism
Assembly
fp
©
=
2s
Cranth
wu
Xs)
ee
ee
No,
2444
QL-A2

Parts
List
£22658-002
Cabinet
Ass’y
E10231-001
Cabinet
E35463-001
Front
Panel
E65480-001
Mark
(JVC
Mark)
E65393-001
Mark
E65526-001
Cushion
See
page
14.
Power
Cord
/\
=
Cord
Stopper
Cord
Stopper
Plate
Cord
Clamp
P.C.
Board
Ass’v
AA
P.C.
Board
Ass’y
*
L.E.D.P.C.
Board
Ass’y*
Push
Switch
P.C.
Board
Ass‘y*
Fuse
P.C.
Board
Assy”
Transistor
P.C.
Board
Ass’y™
Tapping
Screw
Micro
Switch
A\
Tapping
Screw
Fuse
AV
oA
43
44
Platter
Cover
Platter
See
page
14.
E22659-001
£61472-002
Lifter
Ass‘y
E61194-001
Spring
REE3000X
E
Ring
A2001
Base
Ass’y
(Refer
to
page
13.)
SBSB30102Z
Tapping
Screw
G4942-4
Speed
Nut
G41505-1
Steel
Ball
E4987
3-002
Ball
Holder
SBSB3008Z
Tapping
Screw
£33896-003
|
Arm
Lever
Ass‘y
E35458-001
Knob
Base
Ass’y
(Refer
to
page
13.)
Tapping
Screw
Arm
Rest
Ass‘y
Washer
Nut
Knob
w
SBSB3008Z
See
page
14.
SBSB3016M
See
page
14.
=
=
oe
HPWH
KIO
OCO~NOINPWN—
QML1310-051
E03697-003
E33944-001
E65499-001
SBSB30082
E65291-001
SBSB30082
E35460-001
E10215-001
E61992-002
SDSP3008MS
Lug
Strip
Ass’y
Signal
Cord
Ass’y
Cord
Stopper
Shield
Cover
Tapping
Screw
Color
Screen
Tapping
Screw
Dust
Cover
Ass’y
Dust
Cover
Hinge
Ass’
Screw
SBSB3008Z
E60982-002
WLS4000N
NTB4000BS
E3547
1-001
E35507-001
£65303-001
"
(ANTI)
See
page
14.
|
Foot
Ass'y
See
page
14.
|
Power
Transformer
A\
a “
£61824-001
Cushion
E65273-001
Foot
Holder
E61985-001
Spacer
Q03091-112
Washer
Bottom
Plate
Ass’y
Frame
Tapping
Screw
See
page
15.
E35457-001
SBSB30082
SBSB3012M
SBSB3016M
E48820-001
See
page
14.
SBSB3008Z
QMLO0002-051
SBSB3008Z
$BSB30122
Tapping
Screw
M938A
Motor
DPSP4008Z
Ass’y
Screw
E60985-001
Rod
E49679-001
Rod
Holder
E49595-003
Elevator
Cam
E49596-001
Spring
REE3000X
E
Ring
E60986-002
Rod
See
page
14.
|
Tonearm
Ass‘y
E65289-001
Stopper
SBSB3008Z
Tapping
Screw
”
EP-Adaptor
Voltage
Selector
A\
Tapping
Screw
Lug
Strip
Ass’y
Tapping
Screw
*These
parts
are
not
supplied
separately.
NOTE:
A\SAFETY
PARTS
OL-Az
—12—-
No.
24
|
|
|
|

11-(2)
Mechanism
Base
Assembly
yp
pacers
CL)
arent
2
E-Ring
fo
COleenteth
Engaging
Pawi
£49626-001
L.
Trip
Pawl
(5)
REE5000X
—_—_@
E-Ring
69)
E49623-003
Reject
pa
G
“a,
G,
E49651-001
Spring
)
E21656-001
Gear
£35450-002
Base
Sub
Ass’y
£65251-001
ce
(9)
Spring
£49613-007
R.
Lever
Ass‘y
REE3000X
E-Ring
REE3000X
@7)
E65249-001
E-Ring
Switch
Lever
Fig.
24
11-(3)
Knob
Base
Assembly
1S)
E49608-003
E34503-003
Knob
Base
E60912-001
Speed
Nut
E60791-003
Spring
£60981-001
E61811-001
E49605-001
Cam
Shaft
Rubber
Tube
1.F.C.
Spring
€60912-001
Speed
Nut
£49603-001
SBSB30082
a)
.F.C.
Lever
repping
Screw
(
SBSB3008Z
(09
£34240-002
f
Tapping
Screw
Cueing
Ass’y
E34504-001
Knob
Shaft
Fig.
25
QL-A2
No.
2444
-—13—-

11-(4)
Tonearm
Assembly
E34534-002
Counterweight
£22081-004
CO)
(19
Pipe
Arm
Ass‘y
a»
See
table
below,
ag
Mame
E34972-001
4
e
(20)
Headshell
Assy?
:
ag
{19
See
table
below.
Screw
See
table
below.
Screw
Ass’y
|
onnean
.
|
|
|
\
SX
—=
|
“S
{
|
|
See
table
below.
i=
Cartridge
body
|
==
|
See
table
below.
\
}
(29)
Stylus
Ass’y
ed
“NPS
(26)
See
table
below.
iy
Stylus
Cover
Fig.
26
11-(5)
Parts
List
with
Specified
Numbers
for
Designated
Areas
:
U.S.
Military
Market
and
Description
U.S.A.
&
Canada
|
Other
Countries
U.K,
Australia
Europe
Platter
Cover
£22719-002
E22719-001
E22719-001
E22719-001
E22719-001
Power
Transformer
/\}
E03032-31B
E03032-31D
E03032-31C E03032-31C
E03032-31C
Tonearm
Ass‘y
ARM-523
MP-185S
ARM-523
MP-185S
MP-185S
Power
Cord
/\
QMP
1200-244
QMPS017-008
QMP3910-244
Cord
Stopper
QMP
1200-244
QHS3876-162
E65465-001
QMP
2500-200
A37897
A37897
A37897
A37897
Cord
Stopper
Plate
Cord
Clamp
P.C.
Board
Ass’y
A\
|
TXX-124B
TXX-124C
TXX-124D
TXX-124F
TXX-124E
TX
X-124E
Contact
Clip
£45524-001
£45524-001
£48965-002
£48965-002
E48965-002
P.C.
Board
(plain)
£22742-002
E22742-001
£22742-001BS
E22742-001
E22742-001
Micro
Switch
A\
QSM1V01-001
QSM1V01-001
|
QSM1V01022
QSM1V01-022
QSM1V01.022
Fuse
A\
QMF61U1-R50
QMF60S1-R50
|
QMF51A2-R50
QMF51A2-R50
QMF51A2-R50
0.5A
0.5A)
(0.5AT)
SAT.
0.5AT.
Fuse
A\
QMF61U1-R50
OQMF60S1-R50
|
QMF51A2-R125
|
QMF51A2-R125
|
QMF51A2-R125
(0.5A)
(0.5A)
{0.125AT)
(0.125AT)
{0.125AT)
E35118-012ieaw)
E35118-013:6Lu
£22342-008
QSR0085-001
5A
E35118-010
‘stk
E351
18-01
1
(sry)
E22342-007
€35118-012
tern
E35118-013
eu
E22342-008
E35118-012
ieani
E35118-013
teu»
E22342-008
E35118-012
tern
E35118-013
isu
E22342-008
Foot
Ass‘y
Foot
Ass‘y
Bottom
Plate
Ass’y
Voltage
Selector
A
Cartridge
Body
MD-1025
MD-1025
MD-1025
Stylus
Ass’y
DT-Z21S
DT-Z1S
DT-Z1S
Screw
EG83456
EG83456
EG83456
Washer
EG82971
EG82971
EG8297%
Nut
E60503-001
E60503-001
E60503-001
E34268-001
Stylus
Cover
E34268-001
E34268-001
Screw
Ass‘y
E61
153-003
E61153-003
NOTE:
A\
SAFETY
PARTS
OL-A2
aq
No.
24¢

JawW1OJsued}
OF
AYVGNOD3S
Ry
aguVO8d
'O'd
JSNd
ABULAOJSUBI}
OF
AYVIIYd
—_—"
|
|
4amod
4103
HOLIMS
OYOSIW
124
AAddNS
YaMOd
HOLSISNVUL
ee
QuVO8
‘9'd
“G37
12.
Connection
Diagram
of
TXX
abueyo
paads
410}
d
GNV
HOLIMS
y
GHuvVOd
‘9
£2
“B13
QL-A2
No.
2444

13.
TXX-124
Schematic
Diagram
NJM4558D-D
SM6415A-4S,
NJM4558D
2S€945
(P,Q)
2SA733
(P,Q)
2SC1775A(F7)
250571
(L,K)
250325
(D,E)
SIBOI-
02
SR103C
X.TAL
182473
[mro36a(QL-az)]
mM-938B(QL-F4)
DOMESTIC
(TXX-124)
Mxx
124A
A
B
[Txx-126-s)
«|
SPEED
SELECT.
SW,
S1
|
33
W3rpm.
C801
10n
/16V
1€801
1¢802
1C803
R603
1K
X803,
X814,
X816,
X817
Oofttg
X01,
X804,
X805,
X806,
X807
Cabs
x813,
X816
X802,
X809,
XB10,
X811,
X812
XB15
Wave
from
1¢801
|
FG
Amp
FH
om
O46}
1
Shaper
Oscillator
/
Fregency
divider
F-V,
P-D
IC
SM6415A-~4S
0810,
0811,
0812,
0813
D804,
0805,
0806,
D807,
0808
£04300-004
0801,
0802,
0803
10ms
|
|
|
|
|
x808
|
aml
2sv
[+
|
|
|
|
|
+
ceoz
F
rowley
=
R810
47K
cB05
=
0.022
C813
10u/16V)
R817
160K
Wy—4-
R818
330K
|
ay
———}
REID
yp.
z
ion
Te?
Re15
3.3K
|
fe
RE47
IK
OI2W)
From
Cartridge
|
=e
R839
390
(»
X805
x8
X809
X810
Y
'©)
X807
X808
O
XBi1
XB12
=
|
TONE-ARM
SHIELD
COVER
of
_J
|
\
Signal
circuit
of
QL-A2
Printed
Circuit
Board
Ass’y
Location
P.C.
Board
Ass’y
Description
TXX-124
Res!
2.7(W)
4.5V
A
Warning
!
yet!
823
220u/S0V
473/50V
EE
&EA(for
Europe
&
Australia)
axx-124€]
oe
AAA
on
AY)
L
0.445
™
SOPSTRANS,
1.
Be
careful
not
to
allow
metallic
dust,
etc.
to
enter
inside
the
unit,
be
cause
its
motor
is
comprised
of
magnetic
elements.
NJM4558D,
MJM4558D-D
1¢801,
1C803
SM6415A-4S
2SA733
2SC945
2SC1775A
X801,
X803,
X804,
X805
X806,
X807,
X808,
X813
X814,
XB16,
X817,
X818
280571
B
XB02
X809 X810
X81)
xX812
250325
S1B01-
02
0810,
D811,
D812
0813
OLTAGE
SELECTOR
E
Fs
ie
B
Notes:
1.
The
voltage
indicated
in[-_]
is
measured
by
a
tester
having
an
internal
impedance
of
33.k2/V.
©
(_]
33-1/3
rpm
©
(_)
45
rpm
[
]
When
locked
2.
X809
through
X812
should
be
of
the
same
rank.
(There
are
four
different
rankings
avail-
able
on
the
market
as
follows:
2SD571
K1,K2,L1
and
L2
Be
sure
to
use
only
one
rank
of
those
transistors
being
replaced.)
3.
When
replacing
either
of
these
transistors
2SC1775A(F7),
X813
or
X818,
they
should
be
replaced
together
as
a
pair
both
being
of
the
same
rank.
4.
——
indicates
positive
B
power
supply.
5.
=——
indicates
signal
path.
6.
When
replacing
the
parts
in
the
dark-
ened
area
and
those
marked
with
A
,
be
sure
to
use
the
designated
parts
to
ensure
safety.
7.
This
is
the
standard
circuit
diagram.
The
design
and
contents
are
subject
to
change
without
notice.
NJM4558D,
MJM4558D-D
1
3209
yy
pate
42
1CB01,
1C803
hy
1802
254733
2SC945
2SC1775A
2SD571
SM6415A-4S
}
DIAGRAM
Mov
SR103C
192473
D804,
0805,
D806
0807,
D808
D801,
D802,
0803
[-vout.
[|
nov
[r2ov
[CONNECTION]
1-5,
2-6]
3-6,4-1
E
F
2.
After
replacement
of
the
X813
transistor,
apply
KE45RTV
(silicone
adhesive)
or
an
equivalent
material
around
the
transistor
for
thermal
con-
duction.
—
16
—
X801,
X803,
X804,
X805
c
B
X802
X809
X810
x811
X806,
X807,
X808,
X813
X812
X814,
X816,
X817,
X818
280325
SIBO1-02
A
X815
0810,
DB11,
DB12
0813
SR103C
182473
K
A
A
K
0804,
D805,
D806
0801,
D802,
D803
0807,
D808
QL-A2
No.
2444

1
4.
TXX-1
24
Printed
Circuit
Boa
rd
Ass’y
and
Parts
List
The
assembly
varies
according
to
the
area
where
the
units
is
sold.
Refer
to
the
table
shown
on
page
28.
A
B
Cc
D
E
F
2
2
3
ae
3
4
4
eats
d
(
d
33
kQ/V)
ree
.
Voltage
values
in
are
measured
with
a
tester
(impedance
k{2/V)
without
a
signal
applied
to
the
unit.
: .
2
ME
indicates
positive
B
power
supply
°
g
PP
1.
Be
careful
not
to
allow
metallic
dust,
etc.
to
enter
2.
After
replacement
of
the
X813
transistor,
apply
7
HMB
indicates
ground
:
inside
the
unit,
be
cause
its
motor
is
comprised
of
KE45RTV
(silicone
adhesive)
or
an
equivalent
my
:
magnetic
elements.
material
around
the
transistor
for
thermal
con-
indicates
the
others.
:
duction.
aL-A2
No.
2444
-~17-

Transistors
Rating
Description
2SA733
(P,
Q)
180
MHz
Silicon
2SD571
(L,
K)
110
MHz
2SC945
(P,
Q)
250
MHz
2SA733
(P,
Q)
180
MHz
ow
2SA733
(P,
Q)
2SA733
(P,
Q)
2SA733
(P,
Q)
2SA733
(P,
Q)
2SD571
(L,
K)
2SD571
(L,
K)
2SD571
(L,
K)
2SD571
(L,
K)
2SC1775A
(F7)
2SC945
(P,
Q)
2SD325
(D,
E)
2SC945
(P,
Q)
2SC945
(P,
Q)
2SC1775A
(F7)
110
MHz
a
Hitachi
NEC
Sanyo
NEC
”
Hitachi
200
MHz
250
MHz
8
MHz
250
MHz
ow
200
MHz
Integrated
Circuits
NJM4558D-D
Shin
Nippon
Musen
SM6415A-4S
i
Nihon
Precision
Circuit
NJM4558D
Shin
Nippon
Musen
182473
:
Toyo
Dengu
182473
e
182473
$R103C
.E.D.
NEC
SR103C
ur
SR103C
$R103C
SR103C
RD5.6EC
$1B01-02
SIBO1-02
$1B01-02
$1B01-02
VD1121
on
;
|
OL-A2
—
18-
No.
244

Capacitors
[“remNo.
|
PartNumber
[Rang
«(|
—‘Dessrintion——SSSSSCSC~S~S
Electrolytic
QEW51CA-106
QEW51CA-106
QEW51EA-475
QC
F31HP-102
QCF31HP-223
QCT25UJ-100
QCT25UJ-100
QFM31HK-223
AWS
104J50
QFM31HK-103
QFM31HK-104
QCF31HP-223
QEWS51CA-106
QCF31HP-102
QFM31HK-223
QEB51EM-335
QEW51VA-107
QEW51HA-474
QEW51HA-476
QCF31HP-102
QEW51HA-476
QEW51HA-227
QEW51HA-227
QCF12HP-103
QFA72BM-473
QFH53AM-473M
QFH72BM-473M
QFZ9007-473
QFZ9007-473BS
Resistors
QRD141J-103SY
QRD141J-103SY
QRD141J-102SY
QRD141J-222SY
QRD141J-102SY
QRD141J-105SY
QRD141J-104SY
QRD141J-103SY
QRD141J-272SY
QRD141J-473SY
QRV
144F-3302
QRV144F-1103
ORD141J-182SY
ORD141J-682SY
QRD141J-332SY
QRD141J-562SY
OQRD141J-164SY
QRD141J-334SY
QRD141J-103SY
QRD141J-103SY
QL-A2
No,
2444
um
Ceramic
”
10
pF
0.022
uF
Mylar
0.1
uF
Polypropylene
0.01
uF
Mylar
0.1
uF
ne
0.022
uF
Ceramic
10
pF
Electrolytic
1000
pF
Ceramic
0.022
uF
Mylar
3.3
uF
Low
leak
current
electrolytic
100
uF
Electrolytic
0.47
nF
ae
47
uF
os
1000
pF
Ceramic
Electrolytic
”
om
Ceramic
Metallized
polypropylene
(For
TXX-124C)
(For
TXX-124D)
(For
TXX-124B)
(For
TXX-124E)
(For
TXX-124F)
Metal
film
”
Carbon
”
”
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