Pioneer PL-2 User manual

Te,
Setvice
PALEY ET
REPAIR
&
ADJUSTMENTS
ORDER
NO.
ART-713-0
STEREO TURNTABLE
L-2_
PL-120
MODEL
PL-2
COMES
IN
SIX
VERSIONS
DISTINGUISHED
AS
FOLLOWS:
Voltage Remarks
120V
only
U.S.A.
model
(Without
cartridge)
120V
only
Canada
model
(Without
cartridge)
—
WE
220V
—
240V
Europe
model
220V
—
240V
United
kingdom
model
220V
—
240V
Oceania
model
110V—120V/220V—240V
(Switchable)
General
export
model
MODEL
PL-120(which
is
minor
change
in
design
from
PL-2)
COMES
IN
FOUR
VERSIONS
DISTINGUISHED
AS
FOLLOWS:
220V
—
240V
Europe
mode!
220V
—
240V
United
kingdom
model
220V
—
240V
Oceania
model
110V—120V/220V—240V
(Switchable)
General
export
model
=
This
is
the
service
manual
for
model
PL-2/KUT.
For
servicing
of
the
other
types,
please
refer
to
the
additional
service
manual.
=
Ce
manuel
d‘instruction
se
refére
au
mode
de
réglage,
en
francais.
=
Estemanual
de
servicio
trata
del
método
de
ajuste
escrito
en
espanol.
PIONEER ELECTRONIC CORPORATION! 4-1. Meguro 1-Chome, Meguro-ku, Tokyo 153, Japan
U.S. PIONEER ELECTRONICS CORPORATION 6&5 Oxford Orive, Moonachie, New Jersey 07074, U.S.A.
PIONEER ELECTRONIC (EUROPE) N.V. Luithagen-Haven 9, 2030 Antwerp, Belgium
PIONEER ELECTRONICS AUSTRALIA PTY. LTD. 178-184 Boundary Road, Braeside, Victoria 3195, Australia
FU © APR. 1981 Pint sed in Japan

a
For
the
circuit
and
mechanism
descriptions,
please
refer
to
the
supplement
of
model
PL-7
service
manual
(ART-768).
CONTENTS
1, SPECIFICATIONS .2%.cex weds 4 be eee wes 2
2. FRONT PANEL FACILITIES.............. 3
Gs: DISASSEMBLY se ssnak ing. eS soceare. geet et ots 4
4. TROUBLESHOOTING ..............0005. 6
5. PRECAUTIONS FOR REASSEMBLY......... 8
6. ELECTRICAL PARTS LIST.............. 10
7. P.C. BOARD CONNECTION DIAGRAM...... 11
1. SPECIFICATIONS
Motor and Turntable
Drive SystOm 6.446 Se Pewee Ee we Hw SH le Belt-drive
WONG siege Bog eae Se Ay ee 8 Ok Bok See ees DC motor
Turntable Piatter ....... 310mm diam. aluminum alloy die-cast
DP RCGS x 8s Cader ab A ae ey le be ae SE eck 3d 33-1/3 and 45rpm
Wow and Flutter .............. Less than 0.05% (WRMS)
Signal-to-Noise Ratio. .........2... More than 68dB (DIN-B)
(with Pioneer cartridge model PC-220)
Tonearm
MEY cs Sth a So ct tees ae 3s Static-balance type, Straight pipe arm
Effective Arm Length ............,.....004. 221mm
OVOCIVANG e253 i eh, ed ee eee ee es Ge Ot eo es 15.5mm
Usable Cartridge Weight ...... . 3a (min.) to 8g (max.)
Subfunctions
Auto-return mechanism, Anti-skating force contro!, Stylus pressure
direct-readout counterweight, Cueing device, Free stop hinges
8. SCHEMATIC DIAGRAM ................ 12
9. EXPLODED VIEWS ....6.40 625 coi bees 14
TO APACKING:s.2. 22 5 dh ace a) & dard, & dee oe & Oh St 18
1d: ADJUSTMENTS £54 c wea sd BES aas DAs ¥ 19
REGULAGE 5k caaacie eee oe ecey aet 22
PSUISTE ieee oa ee ko ele ee als 23
Miscellaneous
Power Requirements.................. AC120V, 6OHz
Power Consumption 2 4.66 3066 Ge ers BA ER SL ES Su 3W
Dimensions .............., 420(W) X 108(H) X 367(D)mm
16-1/2(W) x 4-1/4(H) X 14-7/16(D)in.
WV SIE cs oes sa, Ses ee ee, Bt ae eo i Ge dee he Ge 5.1kg/11 tb 4 oz
Accessories
EP AGapIer: a. 2 a: fos: whle eh ete ea OMe eb Oe Oe A a ik 1
Operating Instructions... ......000...0. 20.0000 2 eee. 1
NOTE:
Specifications and design subject to possible modification without
notice, due to improvements.

2. FRONT PANEL FACILITIES
fox
X = “~
X S, ee \
co a
\ Se
~
\
12)
a)
(j—
e/
(1) SPEED switch |
Set this switch in accordance with the speed of the re-
cord which is to be played.
[33] (depressed position): For 33-1/3 rpm records
[45] (released position): For 45 rpm records
(2)Cartridge
(3) Headshell
(4) Tonearm
(5) ARM ELEVATION lever
Operate this lever when starting record play or when
temporarily suspending play.
(6) ANTI-SKATE control
This
is
rotated
when
performing
the
anti-skating
adjust-
ment.
6)
ae
S)
(4)
(3)
Q)
(7) Arm rest
This serves to hold and clamp the tonearm. When
moving the tonearm, release the clamp.
Tracking force adjustment weight
This is used when adjusting the tracking force.
(9) Platter
(0) Platter mounting shaft
(1) Rubber mat
(2 EP adapter
This
is
used
when
playing
records
without
a
‘‘middle.”
43) Cabinet
(4) Dust cover

3. DISASSEMBLY
3.1 PANEL AND BASE
In removing the panel, follow the below listed
steps in the order given. Using any unnecessary
force will result in bending the springs or damaging
other parts.
Panel removal steps
1. Remove the headshell and weight assembly,
and the weight shaft assembly.
The weight shaft assembly is removed by
loosening screw (Hexagone socket screw)
and the headshell by loosening screw @.
2. Lift off the turntable platter.
Turntable
platter
oe
;
Pane!
Motor assembly;
CO ~1 OS
Dust cov
Y er
. Loosen insulator attachment screws @ and
remove the insulator. (Do not mix the color-
coded float springs. They must be replaced
with their original insulators during reassemb-
ly.)
. Remove the rear panel PU cord strain relief.
. Lift the front section of the panel (operating
controls) very slightly
. Unplug the 2p connector.
. Completely remove the PU cord fromthe panel.
. Taking care not to damage the tonearm,
remove it from the panel. (Hold the tonearm
steady.)
Weight assembly
®
Screw.
a Rubber bush
oa Weight shaft assembly
we
Control mechanism
Fig. 3-1 Disassembly

3.2 TONEARM
1. Disconnect the tonearm lead wires from the
PU board (See Fig. 3-2).
Note that some of the lead wires have been
soldered to the PU board, and must be discon-
nected with care.
2. Loosen the set screw @ with a screwdriver to
remove the PU plate under the arm base
(See Fig. 3-3).
3. Undo the screw @ securing the tonearm to the
arm
base
(See
Fig.
3-3).
3.3 TONEARM SECTION
Remove the tonearm section by taking out the
three arm base attachment screws @ and one
ground wire securing screws @.
3.4 CONTROL MECHANISM SECTION
After the tonearm section has been removed,
loosen the three control mechanism attachment
screws @ and remove the assembly.
Tomearm
Screwdriver
3.5 PANEL AND BASE REASSEMBLY
1. Attach the PU cord stopper.
2. Attach the insulators. (Make certain the color-
coded float springs are attached to the correct
insulators.)
3. Attach the weight shaft assembly.
Tonearm
lead wires
PU board Red
Fig. 3-2 Disconnect the tonearm lead wires
_S-@
_ (Hexagone socket screw)
~ (2 PU plate
Fig. 3-3 Remote tonearm

4. TROUBLESHOOTING
Use the following directions to find the cause of
each type of breakdown. Improper adjustment
units should be completely readjusted.
# AUTO-RETURN DOES NOT WORK
Change in starting position adyjust-
ment.
Starting plate does not follow the N
signal plate.
YES
YES
After starting, incomplete reset of the
signal plate. (See section 1)
YES
The inner areas of records can not
be tracked.
YES
Looseness in the PU plate attach-
ment.
Section 1
After performing the return operation, if the
curved
section
of
the
signal
plate
and
curved
sect-
ion
of
the
starting
plate
are
not
in
contact
with
surfaces
(A)
and
(B)
respectively
of
the
cam,
reset
will
be
incomplete
and
the
starting
position
will
be
late.
As
a
result,
the
return
function
may
not
operate
at
times.
In
this
case,
bend
the
signal
plate
C)so
that
dimension
A)
is
0.5mm
or
larger.
6
NO
Inner diameter of the starting plate
hole is small.
2 Too much grease between the signal
hole is small.
Protrusions on the caulk section of
the starting plate hole.
Not enough grease between the
starting plate and signal plate.
NO
The
curved
section
of
the
signal
plate is deformed.
PU cord is touching the PU plate.
Arm lead wire is caught on something.
Operator of the detection lever is
not smooth.
Signal plate
Cam
Fig.
4-1
Incomplete
reset
of
starting
and
signal
plates.

# RETURN IS FAST (RETURN AT 1mm PITCH)
Protrusions on the pinion gear section
(See Section 2)
Section 2
If there are rough areas of plastic protruding
from the ‘A) section of the protruding section of
the pinion gear, the return function may operate
at a pitch of only 1mm. In this case, remove the
plastic protrusions completely (Fig. 4-2).
Pinion gear
protruding
section
Fig. 4-2 Elimination of pinion gear protrusions
# MOTOR DOES NOT ROTATE
2P connector is not attached.
Connector is not properly installed.
=» MOTOR DOES NOT STOP
The switch lever and switch locker
are not locking (See section 3).
Section 3
In order to turn the power OFF, the PU plate
shaft touches surface (A) of the switch locker
pushing it over so it locks with the switch lever
turning the microswitch OFF (Fig. 4-3). If
the amount of push on the switch locker is insuf- A
ficient, it can not lock with the switch lever.
With the tonearm locked in the arm rest, as shown
The installation location of the PU
plate is incorrect.
PU plate
Switch
locker
in figure 4-4, attach the PU plate precisely mid- Sitch lever
way between the first and second points from the
arm base scale mark counting away from you. Fig. 4-3 Adjustment of switch lot er
Arm base
scale mark
Fig. 4-4 Adjustment PU plate

5. PRECAUTIONS FOR REASSEMBLY
Follow these directions and precautions when
reassembling a unit after completing repairs. Be
sure to lubricate as required, make no mistakes
when attaching parts, and avoid all other careless
mistakes that may be the cause of trouble later on.
5.1 AREAS THAT REQUIRE LUBRICATION
NOTE:
Types of lubricants and areas where they are used are
listed in table 1.
Table 1
Areas used Type of Oil
raising shaft
—_
all other areas
Silicon Oi! #100000
(GEM-002)
GYA-008
Lubrication points are specified for oils other
than GYA-008. Never use a different type of oil.
e Cam Section
Apply oil to the heart-shaped grooved section
(rear side of the cam) and lock plate sliding section
in order to minimize wear on the sliding section
and the burden on the mechanism.
e Driving Plate Assembly
Decrease the burden on the mechanism and the
wear on the sliding section.
Sides, top, and bottom surfaces
(sliding section of auto-stop
mechanism)
Sides surface :
(sliding section of
auto-stop mechanism)
EV cam side surface
(sliding section of elevation cam)
Fig. 5-1 Driving panel assembly section
© Switch Locker Section
Apply oil to the switch locker (opening) and
sub-panel
base
sliding
section
to
decrease
the
burden on the mechanism.
When
applying
oil
to
the
opening
(shaft
hole),
do
not
apply
any
oil
2—3mm
from
the
bottom
surface.
If
oil
is
applied
2—3mm
within
the
bottom
surface,
it
may
come
out
the
bottom
and
gO
between
the
switch
lever
and
sub-panel
base
causing
the
switch
lever
to
operate
ineffectively.
Switch locker
Fig. 5-2 Switch locker section
e EV Lever Unit Section
Apply
oil
to
the
sliding
section
of
leaf
spring
(A)
and
EV
lever
unit
to
decrease
the
burden
on
the
mechanism.
Leaf spring (A)
S</ sliding section
a
aN
ie
EV lever unit
EV lever unit
sliding section
Fig. 5-3 EV lever unit section
e Elevation Cam Section
Apply oil to the elevation cam and sliding sec-
tion of the raising shaft to decrease the burden
when operated.
Elevation cam
Fig. 5-4 Elevation cam section
e EV Sheet Section
Apply
oil
to
the
raising
shaft
and
sliding
section
of
the
bearing
to
assure
stability
in
the
eJevation
lowering
speed.

Apply all around
at a width of 1mm
Half of the grooved
section
EV sheet assembly
Fig. 5-5 EV sheet section
5.2 PRECAUTIONS FOR ATTACHMENT OF
PARTS AND REASSEMBLY
e Motor Attachment
When installing the motor, set the cam in the
mechanism stop location and verify that the
starting plate section B does not protrude be-
yond surface A of the cam. If the motor is at-
tached with the starting plate section B protrud-
ing, the starting plate may be deformed, the motor
pinion gear may be scratched, and the return
function may be damaged.
Signal plate Ss.
Starting plate OS
Fig. 5-6 Motor attachment
e PU Plate Attachment
Push the PU plate into place so that the PU
plate bearing section touches the revolution shaft
attachment nut. Installation direction is as shown
in figure 5-7. Note that there is a difference be-
tween auto-return and fully automatic models.
Arm base
scale mark
Fig. 5-7 PU plate attachment
e AS Knob Attachment
When installing the AS knob, put the AS knob
rib against the AS knob revolution control stopper
(attached to the arm base) and affix with the
screw. As the stopper may break, be sure to press
the AS knob down firmly when installing it.
Stopper
‘
Cae
Fig. 5-8 AS knob attachment
e Arm Base Attachment
When attaching the arm base section to the
mechanism section, put the mechanism section
switch locker and switch lever in the locked posi-
tion and verify that the tonearm is in the arm rest
location. Also be sure to put the manual elevation
lever in the up position and check that the PU
plate shaft is in the position shown in figure 5-9.
Switch lever — switch locker
Fig. 5-9 Arm base attachement
e Wiring the Connector
When attaching the wires to the 2P connector
from the microswitch, bend the lead wires from
the connector housing as shown in figure 5-10
before attaching.
Lead wires
|
Connector
housing
Fig. 5-10 Start lever unit attachment
6. ELECTRICAL PARTS LIST
NOTES:
e Parts without part number cannot be supplied.
e The /\ mark found on some component parts indicates the importance of the
safety factor of the part. Therefore, when replacing, be sure to use parts of identical
designation.
e For your Parts Stock Control, the fast moving items are indicated with the
marks k** and * .
*x%* GENERALLY MOVES FASTER THAN *
This classification shall be adjusted by each distributor because it depends on model
number, temperature, humidity, etc.
POWER SUPPLY ASSEMBLY (PWR-062)
Mark Part No. Symbol & Description
A\ PCL-040 C1 Capacitor
CEA 221M 25L C2
* PCX-010 D1
(WLO2)
A & PTT-123 Power transformer
(120V)
10

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9. PACKING
=
for,
vee
Bottom side
Parts List
Mark No. Part No. Description
1. N93-603 45 adaptor
** 2. =PXB-501 Weight assembly
3. PRB-193 Operating instructions
4, PHA-127 Protector (t.)
5. PHA-128 Protector (R)
6. PHG-443 Packing case
7. PNX-294 Turntable platter packing
8. PBA-100 Screw
13

10. EXPLODED VIEWS
10.1 EXTERIOR
Parts List
16.
18,
19.
20.
[-s>
21,
22.
23,
26.
27.
28.
29.
30.
31.
33.
34,
35.
36.
37.
38.
39.
40.
NOTES:
e Parts without part number cannot be supplied.
e
The
f\
mark
found
on
some
component
parts
indicates
the
importance
of
the
safety
factor
of
the
part.
Therefore,
when
replacing,
be
sure
to
use
parts
of
identical
designation.
e
For
your
Parts
Stock
Control,
the
fast
moving
items
are
indicated
with
the
marks
**
and
*
.
*%* GENERALLY MOVES FASTER THAN *
This
classification
shall
be
adjusted
by
each
distributor
because
it
depends
on
model
number, temperature, humidity, etc.
Part No Description Mark No. Part No Description
PXB-155
Hinge
assembly
41.
PNX-339
EV
cam
PNV034
Dust
cover
42.
YE50Os
E-type
washer
PNR-166
Turntable
platter
43.
PBH-293
EV
spring
KEB-004
Belt
44.
PBK-053
EV
plate
spring
(A)
PYY-102
Motor
assembly
45.
PNX-336
EV
cam
lever
PBA-112
Screw
46.
PAC-100
AS
knob
PEB-172
Rubber
cushion
47.
PBF-017
Washer
PDG-040
Power
cord
48,
PBH-292
Spring
PEC-058
Strain
relief
49.
PNX-335
AS
plate
PDE-064
PU
cord
50.
PBE-012
AS
spring
washer
PEC-056
Strain
relief
51.
PXB-231
PU
plate
(B)
assembly
PN
X-249
Panel
52.
PBH-308
PU
plate
spring
PAM-086
Front
name
plate
(F)
53.
PNX-301
PU
plate
(A)
PPZ30PO80FMC
Screw
54.
PMD40PO80F
MC
Screw
PAD-096
SP
knob
(D)
unit
55.
YS40FBT
Fixed
washer
PN
X-303
Switch
lever
(C)
56.
WC40FMC
Fiat
washer
PSG-029
Push
switch
57.
PNC-227
PU
spring
washer
PMZ30PO50FMC
Screw
58.
PEB-194
Damper
cushion
IPZ30P160F
MC
Screw
59.
PBH-311
Spring
PWR-062
Power
supply
assembly
60.
PNX-293
Holder
PXA-882
Headshell
assembly
61.
PBA-118
Screw
PEA-057
Rubber
mat
assembly
62.
PBH-312
Spring
PXM-501
Weight
assembly
63.
VBZ30P150RMC
Screw
PXB-227 EV sheet assembly 64. PXT-596 Weight shaft assembly
PXB-247
Tonearm
rest
assembly
65.
PBA-535
Screw
eMeoeour et: Screw 66. PNT-554 Rubber bush
ZMR30H 150FZK Screw
PBA-108 Screw
PN X-341 Tonearm base
IPZ30P100F MC Screw 101. PU cord assembly
102. Selector base (B)
PXB-177 Shaft assembly 103. Base
PPD-624 Tonearm assembly 104, Protection plate
PDZ30PO80FMC Screw 105. Rubber bush
PBA-109 Screw
PDZ30POQ50F MC Screw
PDZ30PO50FMC Screw
PXT-462 EV plate spring (B) unit
VBZ30PO80FMC Screw
PBH-238 EV cam spring
YE3OS E-type washer
14

Exterior
Mechanism assembly

od Ot —4
1
10.2 MECHANISM ASSEMBLY
a aS a
aD
i
|
+
Parts List of Mechanism Ass’y
Mark No.
Part No.
PBA-126
PYY-100
YE40S
PXT-446
PMZ26P100FMC
PEC-065
PNC-220
PBH-224
PBA-123
PSF-018
Description Mark
Screw
Cam assembly
E-type washer
Detector lever unit
Screw
EV cam buffer
Start plate
Start plate spring
Screw
Microswitch
No.
11.
12.
13,
14.
15.
101.
102,
103.
104.
105,
Part No.
PNX-035
PBH-225
PNX-031
PNX-030
PDZ30PO050FMC
Description
Lock plate
Lock plate spring
Switch lock angle
Switch lever
Connector assembly
Driving plate assembly
Sub-panel unit
Plate
Protection plate

11. ADJUSTMENTS
11.1 AUTO-RETURN ADJUSTMENT
1. Turn the auto retum adjustment screw full
around counter-clockwise.
2. When the auto return adjustment screw is turn-
ed back a little at a time clockwise, the tone-
arm will commence to return to the outer
circumference.
3. Stop turning the adjustment screw once the
stylus tip is 33mm away from the center shaft.
4. Once the above adjustment procedure has been
completed, check that the tonearm returns
automatically as designed.
11.2 ARM-ELEVATION ADJUSTMENT
To proceed with the elevation sheet height
adjustment, insert the hexagonal wrench (for
3mm) into the hole at the front of the EV sheet
and rotate it clockwise to reduce the height and
counter-clockwise to increase the height. The
height of the stylus tip from the record surface
is 7 +2mm.
11.3 MOTOR ADJUSTMENT
1. Turn the power on and start the turntable
platter rotating.
2. Turn the speed adjustment knob around to
the mechanically center position.
3. Adjust VR1 and VR2 in the motor assembly
so that the stroboscope appears to be station-
ary. Again this adjustment is performed from
below.
4, Adjust VR2 for 33 rpm speed, and VR1 for
45 rpm.
o. Always adjust at 33rpm.
Screwdriver
Fig. 11-1 Auto-return adjustment
Elevation sheet
Fig. 11-2 Arm-elevation adjustment
VR2
33rpm
VR1
45rom
Fig. 11-3 Motor adjustment
19

11. REGLAGE
11.1 REGLAGE DU RETOUR AUTOMATI-
1.
QUE DU BRAS
Tourer la vis de réglage du retour automatique
du baas a fond dans le sens contraire des aiguil-
les d’une montre.
. Lorsque la vis de réglage du retour automatique
du bras est tournée d’une petite quantité dans le
sens des aiguilles d’une montre, le bras de
lecture commence 4a retourner vers la périphérie
du plateau.
. Arréter de tourner la vis de réglage lorsque
V’extrémité de la pointe de lecture se trouve a
33mm de 1’axe central.
. Lorsque le réglage décrit ci-dessus est terminé,
vérifier que le bras de lecture retourne auto-
matiquement de la maniére désirée.
11.2 REGLAGE DE LA MONTEE DU BRAS
Pour regler la hauteur de la plaque de montée,
introduire une clé hexagonale (de 3mm) dans le
trou situé devant la plaque “EV” et la tourner
dans le sens des aiguilles d’une montre pour réduire
la
hauteur,
ou
dans
le
sens
contraire
des
aiguilles
d’une
montre
pour
augmenter
la
hauteur.
La
hauteur
de
l’extrémité
de
la
pointe
de
lecture
au-
dessus
de
la
surface
du
disque
est
de
7
+2mm.
11.3 REGLAGE DU MOTEUR
L,
2.
3.
Enclencher |’alimentation et faire tourner le
plateau du tourne-disque.
Tourner le bouton de réglage de vitesse sur la
position mécanique centrale.
Régler VR1 et VR2 de l’assemblage moteur, de
maniere a ce que le motif du stroboscope
paraissent immobile. De nouveau, ce réglage est
réalisé depuis dessous.
. Régler VR2 pour la vitesse de 33 tr/min, et
VR1 pour la vitesse de 45 tr/min.
. Régler la vitesse de rotation 4a partir de
33 tr/min.
20
Tournevis
Fig. 11-1 Réglage du retour automatique du bras
Plaque de montée
Fig. 11-2 Réglage de la montée du bras
R2
33 tr/min
VR1
45 tr/min
Fig. 11-3 Réglage du moteur

11. AJUSTE
11.1 AJUSTE PARA EL RETORNO AUTO-
1.
2.
MATICO
Girar el tornillo de ajuste del retorno automatico
completamente hacia la izquierda.
Cuando el tornillo de ajuste del retorno auto-
matico
se
gira
un
poco
hacia
la
derecha,
el
brazo fonocaptor empezara a volver hacia la
circunferencia exterior.
. Dejar de girar el tornillo de ajuste cuando la
punta de la aguja este a 33mm del eje central.
. Una vez realizado el ajuste arriba mencionado,
comprobar que el brazo fonocaptor retorna
automaticamente como se ha designado.
11.2 AJUSTE DE LA ELEVACION DEL
BRAZO
|
Para
proceder
con
el
ajuste
de
la
altura
del
dispo-
sitivo de elevaciOn, insertar la llave de apriete
hexagonal (de 3mm) en el orificio de la parte
frontal
del
dispositivo
de
elevaciOn
y
girarla
hacia
la derecha para reducir la altura y hacia la izquierda
para aumentarla. La altura de la punta de la aguja
desde la superficie del disco deberd ser de 7 +2mm.
11.3 AJUSTE DEL MOTOR
1.
2.
3.
Conectar
la
alimentaciOn
e
iniciar
la
rotacion
del
giradiscos.
Girar
el
mando
de
ajuste
de
la
velocidad
en
torno
a
la
posiciOn
central
mecanicamente.
Ajustar
VR1
y
VR2
del
conjunto
del
motor
de
modo
que
parezca
que
el
estroboscopio
esta
parado.
Realizar
de
unevo
este
ajuste
desde
abajo.
. Ajustar VR2 a 33 rpm y VR1 a 45 rpm.
. Ajustar la velocidad de rotacién a partir de
33 rpm.
Destornillador
Fig. 11-1 Ajuste del retorno automatico
Dispositivo de elevacién
Fig. 11-2 Ajuste de la elevacién del brazo
Fig. 11-3 Ajuste del motor