JVC L-A31 User manual

JVC
L-A31

Contents
Page
1.
Specification
..........-.
Beh
aetes
a
ter
edate
eteeet
tal
2.
Names
of
Controls
and
Their
Function
...........2
3.
Exploded
Views
and
Parts
List...
6.2.00
eee
ee
8
3-(1)
Mechanism
Assembly.
......-2-
500
eceeed
3-(2)
Tonearm
Assembly
......
Mo
eeid
ee ele.
ee 60
3-(3)
Mechanism
Base
.........62e200%
6,
eae
yD:
4.
Operation
of
Automatic
Mechanism
........--+..6
5.
Cartridge
Replacement...
2...
002
ce
ese
e
ee
ee
GB
6.
Adjustment
Procedures...
2.0...
cece
cseeercaad
6-(1)
Overhang
Adjustment.
........0
ccc
ee el
* 6-(2) Anti-skating Adjustment. ........00000007
6-(3) Tonearm Lifter Height Adjustment. ........7
6-(4) Auto-return (Lead-out) Adjustment ........7
* 6-(5) Tracking Force Adjustment. .........-..2.7
WARNING! ,
in either direction.
1. Specifications
MOTOR AND TURNTABLE
*
Motor:
Coreless,
DC
type
FG
servomotor
-Drive
system:
Direct
drive
Speeds:
33-1/3
and
45
rpm
Pitch
control
range:
+3%
431
Less than 0.03% (WRMS), 0.015%
(WRMS)* 0.05% (DIN)
Wow and flutter:
Rumble:
More
than
75
dB
(DIN-B)
Speed
detection:
Integrated
frequency
generator
Platter:
Aluminum
alloy
die-casting
TONEARM
Type:
T.H.
(Tracing-Hold
system,
static
balance)
Straight
tubular
arm
Effective length: 220 mm
Tracking error: +3°35’ -0°43'
Overhang: 15mm .
Tracking
force
range:
O—
3g
(0.1
grams
division,
direct
: reading)
Weight range: 8.5-—129
(including headshell)
CARTRIDGE
(not
provided
on
units
for
U.S.A.,
Canada
and
the
U.K.)
MODEL: 2-18
Type:
Moving
Magnet
(Cartridge
body:
MD-1025)
Stylus:
0.6
mil.
diamond
(DT-
21S)
Optimum tracking: 1.75 + 0.25 grams
force
». 2555 1 ak
Page
6-(6) Motor RPM Adjustments ....... igh aes
7. Block Diagrams..... bogiievacese Gietece ts above bie ars ere 48
8. Printed Circuit Board Ass’ y and Parts List . geese
8-(1) TPS-300 Power Supply and LED P. C.
Board Ass‘'y .......02 2c cece eeces bead)
8-(2) MC-942R Motor Driver P.C. Board Ass’'y... . 10
9.
Packing
Materials
and
Part
Numbers
....
- .
cree
ht
10.
Trouble
Shooting
..........
ease
ROE
wot
tisdaes
12
* 90-(1) When turntable operation is abnormal... . 12
11. L-A31 Schematic Diagrams. .....2002005000214
12. Parts List with Specified Numbers for Designated
0 Ce ee eee re ee
13. Accessories List... ..........+.2+... Back cover
When
replacing
the
parts
marked
with
ZY
,
be
sure
to
use
the
designated
parts
to
ensure
safety.
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 the arrow marked on the .
rear
panel
or
the
chassis.
The
voltage
selector
switch
accommodates
up
to
three
turns
Output:
Frequency response: *
Separation:
Load resistance:
Compliance:
GENERAL
Pawer Source:
Power Consumption:
Dimensions: -
Weight (NET):
FEATURES
. 3 mV (1kHz, 5 cm/sec)
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)
See page 16
See page 16
11.5(H) x 42(W) x 35.5(D) cm
- (with cover closed)
(Since the dimensions show only
the design measuremen ts, Consi-
deration is required when install-
ing the unit in a limited space such
as a rack.)
5.2 kg (11.4 Ibs.)
(without corrugated cardboard
case)
DC type FG servomotor, Direct Drive tow-row stroboscope,
Oil-damaged cueing, Anti-skating mechanism, All front
operations.
“Measured at attached encoder’s output by K & K measur-
ing method.
."_‘ Design and specifications subject to change twithgut notice.

2.
Names
of
Controls
and
Their
Functions
1. EP adaptor
Place
this
adaptor
onto
the
center
spindle
when
you
p'z-
a
record
with
a
bigger
center
hole
such
as
a
doughnut
f€==°c.
. Anti-skating knob
This
device
cancels
out
the
centripeta
force
that
puis
“74
tonearm
to
the
center
of
the
platter.
This
prevents
<"#
stylus
tip
from
skating
toward
the
cemer
of
the
platte’
2-¢
at
the
same
time
eliminates
any
excessive
stylus
tip
*:°74
on
the
inner
wall
of
the
record
groove.
Use
the
®
marked
dia!
when
employing
a
spherical
s*.'-5
Use
the
#@
marked
dial
when
employing
an
elliptical
st>
45
or a Shibata stylus.
Turn
the
dial
to
the
same
number
as
the
tracking
force
2
2'.
. Speed select button
Select
a
proper
position
(
=
33
or
-m
45)
of
the
sceesd
select
button
in
accordance
with
the
rpm
of
the
recc’=
33-3
rpm
record
(LP)
.......ee
ree
eeeeees
"33"
45
cpm
record
(EP)
-..sseeeseeerseeeersrteeess
"45"
. Arm lifter button
This
is
used
when
you
want
the
tonearm
gently
lifteo
.2
or
lowered
down.
When
you
push
it
to
"UP"
position
=
'.
the
tonearm
will
be
lifted
up,
and
when
you
push
*
to
“DOWN”
position
(
a
},
it
will
be
lowered
down
gens»
2*-
to the record surface.
5. Stop button
When
you
stop
playing
the
record,
push
the
button
and
release
it.
The
button
returns
to
its
original
position
and
the
tonearm
lifts
itself
up,
returns
automatically
to
its
rfest
and
the
platter
stops
rotatings.
y
.
Pitch
control
knob
and
strobo
disc
Strobe
pattern
and
stroboscope
When
speed
adjustment
Is
performed,
observe
the
strobe
pattern
around
the
periphery
of
the
platter
for
33-1/3
disc
-
gnd
use
the
stroboscope
provided
for
45
speed.
Turn
the
speed
adjustment
knob
until
the
dots
appear
to
be
stationary.
Be
sure
to
use
the
dot
pattern
corresponding
to
the
local
line
frequency.
e¢
The
dots
appear
to
move
in
the
same
direction
as
the
platter
.......
Turntable
rpm
is
too
fast.
Turn
the
speed
adjustment
knob
toward
§
(slow).
©
The
dots
appear
to
move
in
the
direction
opposile
to
the
platter
.......
‘
Turntable
rpm
is
too
slow.
Turn
the
speed
adjustment
knob
toward
F
(fast)
-
¢
The
dots
appear
to
be
stationary
......-
Turntable
rpm
is
proper.
Your
new
L-A31
is
des:z7ed
to
constantly
maintain
the
cor-
rect
speed,
once
the
i-<
pitch
adjustment
has
been
made
despite
fluctuations
in
272
(normally
40.4%
07
AC
mains
voltage
and
frequency
average)
which
may
Cause
slight
changes
in
the
strobe
<.2tterns
due
to
lighting
of
the
neon
-
larnp,
and
speed
adjus<~ent
is
not
required.
©)
L-A31
No, 2555

3.
Exploded
Views
and
Parts
List
"
3.11)
Mechanism
Assembly
\
nb

Parts List
See page 16 Cabinet
£23733-001 Front Escutcheon
E301422-001 Escutcheo.r
E68120-002 Mark
E23731-001 Turntable
See page 16 Turntable Covering
MC942R Motor Ass‘y
E65922-005 Screw °
LPSP4008ZS Screw
See page 16 Tonearm Ass’
£68028-001 Stopper
£65921-002 Screw
E65824-003 Rest Ass’y
E34085-005SA Mechanism Base
E65921-005 - Screw
G4942-4 Speed Nut
E67313-002 Cueing Assy
E49596-001 Spring
£65769-001 Elevator Ass’y
£49649-001 Spring
‘—_ eet _
oon mn GOoOan oO1[m & WHR
20
21 | SSSP3016MS Screw
22 | E300271-004 Arm Lever Ass’y
23 | £301454-001 Ball Holder
24 | G41505-1 Steel Ball
25 | SBSB3008Z Screw
26 | E67690-001 Anti-skating Ass’y
27 | £301238-001 Anti-skating Knob
28 | E49602-004 Wave Washer
29 | €65922-002 Screw
30 | E301423-001 Push Button
31 | E301555-001 Knob
32 | E03820-005 Push Switch
33 | E68003-001 Volume Base
34 | QVG4A2B-054V_ | Variable Resistor
35 | E301242-001 Lever
E67692-003 Spring
E68141-001 Cueing Rod
E66350-001 ‘| Slider
patio ty lory
‘ i
E66351-001 Spring
E68008-001 Reject Rod
£68144-001 Sheet
€68145-001 Sheet (B)
E68000-001
See page 16
Lamp Guard
Power Transformer
E61824-001 Cushion
E65751-001 Transformer Plate
&65921-002 Screw
See page 16
See page 16
Fuse
Micro Switch
See page 16 Power Cord
See page 16 Connector
See page 16 Lug Strip
See page 16
See page 16
Cord Clamp
Cord Stopper
See page 16 Cord Stopper Plate
See page 16 P.C. Board Ass’y
SR603C L.E.D.
QSP0219-025
E03697-003
Push Switch
Signal Cord
E67761-001 Signa! Circuit Board
E65921-001 Screw 4
EWT042-005 Terminal Wire Ass’y
E67731-002
E£10584-001
Stopper
Bottom Board
See page 16 Foot Ass‘y
E65923-002 Screw
E65921-004 Screw
E23680-001
E68188-001 Hinge Ass’y ie
£66329-001 EP Adaptor ee
See page 16 Mask Cap
See page 16 Voltage Selector A
£68164-001 Strobo Plate
E65922-004 Screw
Dust Cover Ass’
&} : Safety mark
: L-A31
j ; Po. 2555

3-(2)
Tonearm
Assembly
E23744-00A
Arm Ass‘y
E60502-001
67612-002
Screw
Counterweignt
E57604-002
Screw
EG82971
Washer
id E301200-002
oe,
Head
Case
Assy
7 > page 16
‘ : Headshell Ass y
U
See
page
16
z
Pe
‘
Cartridge. Fae PB: a
o; i £67609-001
See page 16 rt ae Wire Ass’y
Styus
——(
,
|
ra
,
8
£60503.001
—
.
Nut
~-See
page
16
Stylus Cover
Fig. 2
3-(3) Mechanism Base
E60912-001 °
£49627-002
Nut
;
Engagement Pawi—
1 .
G5
—-——£48626.00
xa
Lower Trip Paw! ~-——
~-
E49623-003
t
REES5000
Reject
Lever
~~
}
“E"
Ring
.
mn
Ra
E21656-003
7
Gear
E49651-002—_____
{Sprig a pan
Ze
E34085-005
Base Sub Ass’y
E49613-011
Return Lever—_
Ass'y
to
view
teh
AE
oy
Vey
‘
:
pf
£6
5251-001
' Spring eee
EES
|
1s £65249-001
;
i
Fig.
3
;
Switch
ene
re
A31
)
haa
re
,
».
2555
cane

4. Operation of Automatic Mechanism
Char. evcle mechanism:
Ter:
“aying, the notch of the main gear. position
relative to the turntable spindle gear is as shown in Fig.
4. As the projection is away from the engagement, the
main gear does not rotate even though the turntable.
. As playing proceeds, the trip slide moves toward the
center of the turntable following the movement of the
tonearm. .
. The engagement is very easy to move as it simply rests
on the lower trip. On the music section of the record
groove the engagement moves so slightly that it is re-
turned by the tip of the projection. Consequently, the
turntable spindle gear does not engage with the main
gear and thus does not trigger the auto-return operation
as shown in Fig. 5.
. When playing ends and the pick-up cartridge enters the
lead-out groove which is paced out, the engagement
advances more then it is returned by the projection.
Because of this, the engagement is pressed by the pro-
jection zs shown in Fig. 6, causing the main gear to turn
and engage with the turntable spindle gear. Thus the
change cycle is started.
. During zne return operation the engagement and lower
trip which have moved are returned to their original
position by the reject button coming into contact with
the 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 automatic cycle.
Tonearm lift and return mechanism:
1.
5.
Cartridge-Replacement—
&
os
eee
. Unscrew the connector screw to remove the headshell,
. Remove the two long screws on the headshell which
—_
When the main gear starts to rotate at the end of play-
ing, the return lever rotates under the action of the
main gear cam to press the elevazor cam. The upward
movement of the elevator cam is cirectly converted into
movement of the elevator, lifting up the tonearm. (Fig.
7)
. The tonearm is returned by the arm lever the end of
which pressesit as the main gear rotates.
hold the cartridge. (Fig. 8)
. Connect the lead wires of the headshell to the new
Cartridge, being careful to match the polarities correctly,
Polarity and wire colots are as eNews:
White (+)....... L = Red (+). rR. le aS
Blue (-)........ R Green). ee RE Ee
. Attach the cartridge to the headshell ran, and
gently tighten the screws.
. Set the cueing button to “DOWN”, and then bring the
stylus tip to the optimum position by sliding the car-
tridge back and forth. See 6-(1) Cverhang Adjustment.
. After atzaching the cartridge, siide the headshell into the
tonearm. Tighten the connector screw.
. Be sure to adjust the tracking force and lead-i -in position
after reptacing the cartridge.
t
andl
P-ojection
_ Platter Spindle eee
Engagement
Platter Gear
- Fig. 4
Fig. 5 Fig. 6
Return Lever
Elevator Cam
Fig. 7
Plastic ;
Washer D
iK,
IN/o. 4.
! Cartridge
L-Agh
Yn DREF

3-(2) Tonearm Assembly
E23744-00A
Arm Ass'y
£60502-001 eieiahas
Screw Counterweight
E67604-002
Screw
EG82971
Washer
E301200-002
Head Case Ass'y Sa
+See page 16
Headshel! Ass y
See page 16
Cartridge :
oe £67609-001
See page 16 at s W.re Ass’y
Stylus ———-&X y :
E60503-001 , :
Nut
“See
page
16
.
D
. Stylus Cover
7 Fig. 2
3-(3) Mechanism Base
. 2 E60912-001
£49627-002 nut
Engagemeni Paw! <
£49626-001
'
Lower
Trip
Pawi
E49623-003.. REES5000
Reject Lever “E” Ring
Se:
Aor
E21656-003
°
=~
£4965
1-002
=e
ee
Hh)
>
ee
Gear...
Sonia
Spring ‘
E34085-005
SS ps Sa Base Sub Ass’y
£49613-011 4 Se
Return Lever. :
‘ Ass’y Oe
Prien Os ee IN —
= - rok or £65251-001
% Spring
E65249-001
Switch Lever
L-A31
; :
No. 2555 s & t

6.
Adjustment
Procedures
.
The
following
adjustments
should
be
performed
only
when
replacing
a
cartridge
or
a
headshell.
Otherwise,
no
adjustment
is
required.
6-(1) Overhang Adjustment
To
obtain
optimum
overhang,
when
mounting
the
car-
tridge,
first
align
the
cartridge’s
longitudinal
axis
with
that
_of
the
headshell
and
position
the
cartridge
so
that
the
distance
between
the
headshell’s
end
face
and
the
stylus
tip
equals 32mm as shown in Fig. 9. ‘
Be
sure
to
tighten
the
set
screw
after
the
adjustment.
Errors
“within
Imm
are
negligible
from
a
practical
point
of
view.
6-(2)
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
am
marked
dial
for
an
elliptical
or
a
Shibata
stylus.
Set
the
“1.75”
of
the
©
marked
dial
to
the
index
line
since
the
L-A31
is
provided
with
a
spherical
stylus
ard
the
track-
_ing
force
has
been
adjusted
to 1.75.
(Fig.
10)
-6-(3)
Tonearm
Lifter
Height
Adjustment
Adjust
the
height
of
tonearm
lifter
with
the
adjustment
screw
$o
that
the
distance
between
the
stylus
tip
and
the
surface
of
record
is
about
6mm
when
the
stylus
is
elevated.
Turn
the
height
adjustment
screw
clockwise
to
lower,
and
counterclockwise
to
raise
the
tonearm
lifter
level.
(See
Fig.
11.)
6-(4)
Auto-return
(Lead-out)
Adjustment
When
the
pulley
has
been
replaced
for
a
different
record
or
if
auto-return
functions
early,
adjust
as
shown
in
Fig.
12.
—
When
change
cycle
starts
too
late,
turn
the
screw
count-
terclockwise
with
a
screwdriver.
— When change cycle starts too early, turn the screw clock-
wise.
6-(5)
Tracking
Force
Adjustment
(Fig.11)
. Set the anti-skating knob to the “0” mark on the dial.
. Place an unwarped disc onto the platter.
. Remove the stylus cover from the stylus.
. Release the tonearm clamp. ,
. Turn the counterweight until the tonearm is balanced.
.
Stop
turning
the
counterweight
when
the
stylus
tip
is
almost
touching
the
disc
surface.
7. Return the tonearm to the rest and clamp it.
Qn le& WN
If
necessary
to
replace
a
cartridge,
usage
of
that
headshell
exclusive
to
this
unit
is
recommended.
ed
32mm
-
-——
Fig.
9
Fig. 10 -
Fig. 11
Adjustment Screw
Fig. 12
8. Hold the counterweight at the adjusted position and
turn the tracking force dial until the 0" mark is aligned
with the index line on the tonearm weight shaft.
Turn the counterweight in the A direction until the
1.75" mark on the dial is aligned with the index line
for the model preparing cartridge Z-1S except U.SA.,
Canada and U.K..
-A31

Tracking
Force Dial
Counterweight
6-(6) Motor RPM Adjustments
1.
When
adjusting
33-1/3
or
45
RPM,
first
set,
in.
either
5
way,
the
fine
RPM
adjustment
VT
(VR801)
to
around
half
the
maximum
resistance
(the
center
of the
rotating
angle).
ry
2. Connector an oscilloscope between TP-1 and GND on
the motor board as shown at right (Fig. 14)
3.
Adjustments
Oscilloscope
@ 33-1/3 PRM adjustment
Set
SPEED
SW
(SW4)
to
33-1/3
RPM.
then
adjust
the
'
coarse adjustment VR (VR1) on the moior board so that =
the waveform on the oscilloscope has T = 20 msce.
@ 45 RPM adjustment . :
Set SPEED SW (SW4) to 45 RPM, then adjust the coarse vas!
adjustment VR (VR2) on the motor board so that the
waveform on the oscilloscope has T = 14.8 msec.
4. Finally, using the stroboscopic pattern (33-1/3 RPM) “TP4
and the accessory stroboscopic pattern for 45 RPM, con-
firm whether the respective adjustrnents are performed
properly.
7.
Block
Diagrams
Waveform
Shaper
50Hz
+20
(at
33-1/3rpm)
ne
67.5H2z
Power
|
{at
45rpm)
Supply
33-1/3pm
Power
Circuit
:
Switch
45
‘
al?
Pitch
,
rom
17
x
ontro
33-1/2rpm
j
Pa
ae
1
o—45r0m
/
'
Sc
'
m8
i
Speed
Select
Switch
/
i
:
|
i_..-
i
Soe
J
Fig.
15
Oe
ae
L-A3}
ee
-.
No.
2555

31
,
2555
» x
Be
Seige
8.
Printed
Circuit
Board
ae
y
and
Parts
Lisi
8-(1)
TPS-300
Power
Supply
and
LED
P,
c.
Board
Ass’y
5 GPa :
3 TPS-300-2
;
S' @ o
@o804
“"" sw2
ped ©
$ €23902.-:? Oy © aig
©)
oy
Fig. 16
Each
individual
P.C.
Boerd
Location
Capacitors
sae oi
0.047uF | DC100V Mylar
0.01pnF
QFM82AK-473
QFM82AK-103
QETS1IHR-477H | 470uF
QETS51HR-106H | 10uF
QETS1HR-476H_ | 47uF pesov ms
ei QFM81HK-473 0.04 7yF ylar
C807
|
QETSIHR-476H
|
47uF
lectrolytic-
Flectroly tic
4
TPS-300
0-1
:
Power
Supply
P.C.
Board
Asg’y
(2;
TPS-300-2
:LEDP.C.
Board
Ass’y
~
3
TPS-300-3
:
Switch
P.C.
Board
Ass’y
‘4°
TPS-300-4
:
Volume
P.C.
Board
Ass‘'y
Note
(1):
In
0
should
be
indicated
an
area
code
according
Resistors
to
the
table
shown
on
page
section
when
prepar-
QRD148J-103S
Carbon
ing
an
order
form.
QAZ0052-220
Fusible
A
Note
(2):
The
specific
symbols
(#
,
mM,
&,...
etc.)
ORE
*48J-154S
QRO148J-103S
i
on
a
surface
of
P.C.
Board
are
actualy
unrelated
QRD148J-153S
to
the
repair
service
and
are
signifieant
denote-
QRD148J-222S
ment
in
order
to
process
the
proper
assembly
of
QRD148)-473S
QR20052-470 via
QRZ0052-560 F usible
P.C. Board at the factory.
Transistors
[hem
No.
PartNumber__[
Rating
[Descaption
_]
| Pe [| fT Maker
2$0313V(D,E)
2SC945A(P,Q)
Orlers
2SC945A(P,Q)
2SD438(E,F)
QSP0219-025
Push Swigch
E61537-003
Heat
Sink
Diodes
LPSP3008ZS
Screw
SPSP3006ZS
fd
[ie
|
eerivombe
|
£68000.00
Sarai
“p801
|
SIRBAOF
I
Supt
aad
50k
lea
ada
RO20EB3
a
at
See page 16 Fuse Clip
SR6O03C

Capacitors
QET41HR-474
QET41ER-475
QFM41HK-103
AMX104J50
QFM41HK-472
VAS
iS eee:
weet
QFM41HK-103
QET41ER-475 THe Electrolytic
QCY41HK-102 j Ceramic
QFM41HK-103 |0. Mylar
QET41VR-106 Electrolytic
FA
EEN TH
tee
~~,
ed
era:
rm 2 manne
«
Pee er
BS cae ee re ene
y :
“Aw
-
ty
Resistors
t
}
a ee
v
RVAV310-473
RVAV310-473
QR X016J-3R9
QRD141J-102
ORD141J-102
QRD141J-102
QRD141J-102
QRD1415-332
QRD141J-472
QRD141J5-472
QRD141J5-472
QRD141J-472
QROD141J-680
QRD141J5-680
QRD141J-222
QRD141J-122
QRO1421)-332
QROD141J-181
QRD141J-333
QRD141J-222
QRD1415-681
QRO1415-204
QRD141J5-104
QRD1415-683
RESS5SYQ-160KF
—_/
~
Hy
t
mpc: “sa2nLd
238,
eye
pres
|
|
|
|
ito” ; a!
|
|
\
\
|
|
#
“oO
6
a3
C3 as ce a naz Ri Rw ied
ra . den 4 ere
azo ce i ; aie Az Ae,
8
©
.
a
J
-
¢
zg
wo ° e ° e
Note: The specific symbols (#* , ®,@,... ete.)
on a surface of P.C. Board are gctually unrelated
to the repair <rvice and are s(gnificant denote-
ment in order to process the pgoper assembly of
P.C. Board at the factory. QRD1415-562
QROD141J-103
Transistors QRD141J-105
QRD141J-824
[er No. [Part Number | Rating [Description ambi 0
2SC2001(L,K)
2SC20011L,K)
2SC2001{L,K)
_|28¢2001(L,K)
2SA733A (P,Q)
2SA733A (P,Q)
2SA733A(P,Q)
2SC945A IP, K)
2SC945(P,K)
Hall Generator
H.G. Circuit Board
P. Circuit Board
L-A31
No. 2555

9. Packing Materials and Part Numbers
€34725-006
Nylon Cover
E36997-020
2
NZ-LA-31
Protect
Sheet
.
~~
Fillers
E65754-001
Spacer
E65755-002
Spacer
E67612-002
Counterweight
QPGA039-04005
Envelope
(for
Turntable
Covering)
NZ-LA31
£61225-001
__
Fillers
Hinge
Pad
PK-LA31
Packing Case
Fig. 18
AZ
o. 2555 qe

10. Trouble Shooting
10-(1) When turntable operation is abnormal
The turntable does not rotate.
OC 18.6 V ap-
pear between the posi-
tive and negative ter-
Yes
The connection cord is
in contact with the
power supply board,
Does any
voltage appear at the
emitter of ,
X801?
Yes
the soldered joint is not
perfect, or some other
cause.
No
X802 is open or short-
circuited, 0802 is short-
Does
any voltage | circuited, R801 or
appear at the col- ; R802 is disconnected,
lector of or some other cause.
X801? Replace the defective
element.
0801 is open, its as-
sociated pattern is dis-
connected, or some
other cause. Replace
the defective element.
Does an
AC voltage appear
between pins (1)
and (2)?
Note:
Pins (1) and (2) are
located on circuit
board TPS-300. °
Check the connection
of the transformer, the
soldered joint of the
AC cord, or the like. If
anything is defective,
replace it.
Does the
turntable rotate Yo. Check whether or not R18 is
when a short-circuiting is disconnected, or whether or
‘made between TP-2 not IC1 is defective. ifnot,...
and TP.3?
No
Does the
turntable rotate
when a short-circuiting is
made between the collector
and emitter of
X12?
X12 is open, its associated
Pattern is disconnected, or
some other cause.
Yes
No
Does the
turntable rotate
when a short-circuiting is
made between the collector
and emitter of
: X11?
X11 is open, the pattern be-
tween the collector of X12: -
and the base of X11 is discon-
nected, or some other cause.
Ye
No
Does
an output
the turntable is
rotating?
Yes
Does an
Output appear
between the bases of X5 and
Any of X1 — X8 is defec-
tive, the drive coil is dis-
X7 or between the bases connected, or some other
of
X6
and
©
cause.
X8?
No
Any one of R2 — R& is discon-
nected, or Ome Other cause.
-12-
Does the appear between the
turntable rotate by base of X5 and X7 or between the
hand? bases of X6 and X8 when
-4
connectic~ wire
of the spete select
circuit dscon-
nection wre.
Yes Replace the con-
nection wire.
Replace the speed
select switch. ©
Does certact
failure occ.r in the
speec mect
sans?
¥ No
R25 or R31 is
Gefective, or the
connection cord is
disconnected, or
some other cause.
Doe: -ne
turntabe “orate
at eithe” >:-1/3 or
45 F=NN7
Anelement ezund!C1, | . : :
such as C4. =24 etc., is a
defective, o° x:me
other cause
Check whe=er or not
the Hall ele~ert associ-
ated with te sar of
bases betwee- which no
Output appeirs is defec-
tive.
, L-A31
No. 2555

The turntable rotates at high speed.
Does the
turntad'e stop
when TP-3 (the base of
X12) is connected to
END
Deactivate the drive circuit
Yes by connecting the base of
X11 to the +18.6 V line,
then...
A short-circuit is being
made between the col-
lector and emitter of
X12, of some other cause.
turntas e@ stop
when the sase of X11 is
conne=zed to the
18.€ V line?
A short-circuit is being
made between the col-
lector and emitter of X11,
or some other cause.
Does the
turntazie stop
when the co.:ector of X11
is connected to
GNO?
1
\
1
The connect:on pattern of -
R11 and R12 touches the ;
+18.6 V line.
L-A31 .
No. 2555
rotating the turntable
at around 33-1/3 RPM by hand, does
FG output voltage 5 mV (p-p)
apppar?
Yes
No
1
The pattern of the FAG is disconnected,
the rotor magnet flaats, or some other
cause. {
-13—
oO aRe eet
Does an
Output of around
5 Vip-p) appear at TP-1?
@: 5V(p-p)
Does the
waveform in pro-
portion to RPM ap-
pear at pin (3) of 1C1?
Its associated pattern is discon-
nected, the soldered joint of its
associated element is not per-
fect, or some other cause.
C3, C6, 1C1, or anything is
defective.
Yes
Yes.
1C1 is defective,
the capacity of
C10 is lost, R30
is disconnected,
or some other
cause.
Does a
sawtooth shapes wave
appear at pin 13 of 1C1?
Yes
2V(p-p)
1C1 is defective, the capacity of C9 or C4 is lost,
or some other cause.

wes
nea
.
Be.
4
.
x
is
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TPS-300
2SA733A(P,K)
X11
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L-
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Sanat
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VOLT 110v. | 120V. 220v