Pioneer PL-X420 User manual

Service
CIRCUIT
DESCRIPTIONS
oe
REPAIR
&
ADJUSTMENTS
ORDER
NO.
ARP1209-A
STEREO TURNTABLE
L-X420(BK)
MODEL PL-X420 (BK) COMES IN TWO VERSIONS DISTINGUISHED AS FOLLOWS:
Power requirement Destination
AC 220V—240V European continent
r we | aea2ov—2a0v Unied Kraeom
@ This service manual is applicable to the WEM and WB types.
@ As to the WB type, please refer to pages 60.
@ Ce manuel d’instruction se refére au mode de réglage en francais.
@ Este manual de servicio trata del método ajuste escrito en espafiol.
CONTENTS
1. SPECIFICATIONS ................2-0008- 2 9. ELECTRICAL PARTS LIST..............4. 19
2. PANEL FACILITIES.................--008- 3 10. TROUBLESHOOTING. ............20 00005 22
3. DISASSEMBLY ......... 2.0.0 e eee eee 4 11, ADJUSTMENT... 0... ee 30
4. PARTS LOCATIONS................-.005- 7 lhe BEGUIAGE, giadeaxs tyeis dis couhen races 33
5. EXPLODED VIEWS AND PARTS LIST .......... 9 Te AJUSTE «2a cante aeseiwcis eg yd ant atiel g atta 36
6G; PAGRING oi Sia ene we a re Rees 12 12. BLOCKDIAGRAM ............. 00.000 e eee 39
7. P.C. BOARDS CONNECTION DIAGRAM....... 13 13. CIRCUIT DESCRIPTION. ................. 41
8. SCHEMATIC DIAGRAM ................... 7 14: FOR WB TYPE ise ciw Gib aa ace ete wane ws artes 56
PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153, Japan
PIONEER ELECTRONICS SERVICE INC. P.O. Box 1760, Long Beach, California 90801 U.S.A. TEL: [phone]
PIONEER
ELECTRONIC
(EUROPE)
N.V.
Keetbergiaan
1,
2740
Beveren,
Belgium
TEL:
03/775-28-08
PIONEER ELECTRONICS AUSTRALIA PTY. LTD. 178-184 Boundary Road, Braeside, Victoria 3195, Australia
TEL: [phone]
FK © JULY. 1986 Printed in Japan
i

PL-xX420(BK)
1. SPECIFICATIONS
PHONOGRAPH MOTOR AND PLATTER
Motor tye ........ceeececeesseecceeeeseeeceeeteeneees DC servo motor
Drive SYStOM...........:: cc cceeeseeeeseeeeeeeeeeee Belt drive system
Speed of rotation................ 2 speeds: 33-1/3, 45 rpm
Wow and Flutter... eeeeseeseseeseeeees 0.05% WRMS
+0.07% WTD Peak (DIN)
S/N! Pati: seine ecidesevesct desonebedetedeietaceeat 68 dB (DIN-B)
Platte feci3h odode diniedieekehen Diameter 303 mm,
aluminium die cast
TONE ARM
TWO sc ziveecenssdersvas canvas teaadinss Integrated straight pipe arm
SUPPLIED CARTRIDGE (PC-295T)
TYPO 5s osdesSeseeleectaris lads cdiedeantuiscasevsivesslennsstse cistecexent MM type
Replacement stylus ............cceeeeseeeteteeseseeeeeeees PN-295T
Stylus: icciccisccccccadessopacheBactuataadnstiis athe sonnets 0.6 mil diamond
Output voltage ....... 2.5 mV (1 kHz, 5 cm/s LAT Peak)
Suitable stylus preSSure oo... eee eeeeeteeeeees 1-159
(optimum value 1.25 g)
Frequency r@SpOnse ......... cece 10 Hz - 30,000 Hz
Load reSiStaNnCe ..........ceeeseseceeeseseeestseseseteesteseteeeeaees 50 kQ
Weightind.cicndiedesitechucnt tensile aves 6g
FUNCTIONS PROVIDED
Auto lead-in, auto return, auto cut, repeat, re-start
function, arm elevation, manual play.
POWER SUPPLY, OTHER
Power requirements
European, U.K., Australian
models... AC 220 V — 240 V, 50,60 Hz
U.S., Canadian models.................... AC 120 V, 60 Hz
Other destination
models. ............ AC 110 V — 120 V/220 V — 240 V
(switchable), 50,60 Hz
Power consumption
European, U.K., Australian
MOONS = ses5 eaten ea wile Solin beeen 13 W
U.S., Canadian models ........ ccc ciccccesessscesscesenees 12 W
Other destination Models... cceceseeeeeeeeeee 8W
External GiMensions ............ccccccccsesessccseesessescessessnseeseeneees i
362(W) x 100(H) x 355.5(D} mm
14 - 1/4(W) x 4(H) x 14(D) in
Net: WeIQht ic: sccisisticccsssscoiciecieslninceatiaten dedi tess 3.6 kg
8 Ib
SUPPLIED ACCESSORIES
EPs Qa Ptr. ur ac. cs cote tewes op sksesps cada odes css staeeaiiansdaedteeeetereees 1
Operating instructions ...... i ssecseseeeeeceeeteeseeeeeteeeees 1
NOTE:
Specifications and design subject to possible modification
without notice, due to improvements.

PL-X420(BK)
2. PANEL FACILITIES
Cabinet
EP Adaptor
When playing a record with a doughnut hole,
place this over the platter spindle.
Dust Cover
Cartridge (PC-295T)
Platter Spindle
Platter Mat
Platter
ARM ELEVATION Switch
@ Use to perform manual play.
@ Use to temporarily stop playing.
@ Use to change tracks in the middle of play.
When changed, the tone arm moves up or
down.
When [UP] lights — The tone arm rises. (The
stylus is lifted off the record.)
When [DOWN] lights — The tone arm de-
scends. (The stylus is lowered onto the record.)
STOP Switch
Press to stop play.
PLAY Switch
@ Press to begin play.
@ When pressed during FULL AUTO play, the
turntable returns to the first track and begins
playing from there. (Re-start function)
POWER Switch
Press to turn power to the unit ON and
STAND-BY.
SIZE Selector Switch
Set this switch to the size of record which you
intend to play.
[30] (When pressed in) — To play 30 cm LPs
[17] (When in the out position) — To play 17 cm
EPs
SPEED Selector Switch
Set this switch to the rotation speed of the
record which you intend to play.
[45] (When in the out position) — Platter rotates
at 45 rpm.
[33] (When pressed in) — Platter rotates at 33
rpm.
REPEAT Switch
Press to perform repeat playback. When the
switch is pressed in, the REPEAT indicator lights.
indicators
[UP]
Lit: Tone arm is in up position.
Not lit: Tone arm is moving.
{REPEAT] — Lights during REPEAT play.
[DOWN] —_ Tone arm is down.
LOCATE Switch (FORWARD/REVERSE)
Use during manual play and when you want to
change tracks. When pressed, the tone arm
moves left or right.
[FORWARD] — Tone arm moves to the left.
[REVERSE] — Tone arm moves to the right.

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3. DISASSEMBLY
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Fig.3-1 Disassembly

3.1 DISASSEMBLY
1.
2.
oo
a
on
for)
Open the dust cover and pull upward to
remoye it.
Position the tonearm at the lead-in groove ofa
record.
. Remove the rubber mat, the platter, and the
turntable belt.
. Hither manually or using the Arm Locate
switch (<J<j), position the tonearm just above
the section notched for panel removal.
. After removing the 8 securing screws @ lift up
the rear section of the panel assembly, remove
the tonearm assembly from the notched
section and remove the panel assembly by
lifting it up and pulling forward.
. Unscrew securing screw @ to remove the
control board assembly.
Mechanism base
board assembly ae
PL-X420(BK)
3.2 CARRIAGE REMOVAL
1.
2.
od
Guide bar
Remove the fixer from the carriage and the wire
from the pulley. (See Figure 3-2)
Remove the screw @ and pull the guide bar
away from the carriage in the direction indicated
by the arrow. The carriage and tonearm assembly
can now be removed.
Removing the spring will release the carriage
board assembly, and removing two screwsQwill
release the mechanism base boared assembly.
Fig.3-2 Removing Carriage Wire
Carriage board assembly
Tonearm
Caggiage
assembly
Fig.3-3 Carriage Removal

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5.3 REPLACING THE CARRIAGE WIRE
e@ After assembling the carriage and tonearm
assemblies in the opposite order of the previous-
section, replace the carriage wire according to
the following steps.
1. Adjust the length of the wire unit as shown in
figure 3-4(@).
2. Attach the wire unit grommet to the spring of
the wormwheel as shown in figure 3-4 ()). Then
wind the wire onto the worm wheel taking care
not to let it get caught in the worm wheel
groove. Also be careful not to let the wire
overlap.
@
Wire unit
Grommet ——t
3. Holding both the wire and the worm wheel,
connect the wire to the wire guard and attach
the worm wheel to the mechanism base.
4, As shown in figure 3-4 (©), put the wire around
the pulley, and push the fixer into the carriage
until it locks with a click.
f
R
GZ
Ve
SRS
f
A
ISS
a
Fig. 3-4 Wire Replacement
3.4 LEAD LINE DISPOSAL
1. Move the carriage to the extreme right (rest
position) and taking care not to stretch out the
4-lead line, attach the line to the hook, as
shown in Fig. 3-5.
2. Move the carriage to the extreme left taking
care not to stretch out the the 2-lead line and
5-lead line, and then making sure that there is
sufficient length of both lines pull the lines
from the notch.
3. Manually move the carriage to the left and
right, and make sure that the lead lines don’t
touch the carriage.
Lag / L |
ag Ol
4-lead shield line
(to the mechanism base board) Notched section
Fig. 3-5 Lead Line Disposal

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4. PARTS LOCATIONS
NOTES:
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 designa-
tion.
© For your parts Stock Control, the fast moving items are indicated with the marks * x
and *.,
* * GENERALLY MOVES FASTER THAN *
This classification shall be adjusted by each distributor because it. depends on model
number, temperature, humidity, etc.
© Parts marked by “®” are not always kept in stock. Their delivery time may be longer
than usual or they may be unavailable.
Front View
Dust cover assembly
PXA1006
* Hinge
PXC-009
Tonearm assembly
PPD1006
Turntable sheet assembly
PEA-073
Panel cover
PAM1009
Turntable platter
PNR- 228
Panel
assembly
PXA1005 -
GEIB] Cw
Power button
PAC1015
Push button S/S button unit
PAC1013 PAD1003
Control button
PAC1014
Rear View
& Hinge
PXC-009
Panel assembly
PXA1005
A\AC power cord assembly
PDF-224
PU cord assembly
PDX-016

PL-xX420(BK)
Top View
eR TEL ——— Adjust cover
PAM-203
% & Pulley
PNY-190
Tonearm assembly
PPD1006
-—-~ Panel cover
Panel assembly ————— PAM1009
PXA1005
Bottom View
% ® Drive motor —_-_________ = ~ Carriage board assembly
PXM-150 \ PWX-101
Mechanism base board assembly
PWX1002 |
Worm wheel Sey obhd ee
PNY-192 | op eg
"a
we Power transformer assembly
PT X-085 |
Se Spindle base
a Shaft base
*® & Motor
PXNM-149
A Control board assembly
PWZ1002
Switch board (C) assembly
Switch board (A) assembly

5.
EXPLODED
VIEW
AND
PARTS
LIST
10

10
NOTES:
© Parts without part number cannot be supplied.
©
The
A
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
designa-
tion.
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.
©
Parts
marked
by
“@®”
are
not
always
kept
in
stock.
Their
delivery
time
may
be
longer
than usual or they may be unavailable.
Parts List of Exploded View
Mark No. —
*
A
16.
17.
kek 18.
19.
** 20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
** 30.
wk 31.
32.
kk 33.
34.
wk 35.
36.
37.
38.
39.
40.
OV One
Part No.
Decription
PPD1006
PWZ1002
PWX-101
PWX1002
PXA1005
PAC1014
PPZ30POSOFMC
PAD1003
PBH-433
PAC1015
PAC1013
PAM1009
IPC30P290F MC
IPC30P100FMC
PNR-228
PEA-073
PLB-114
PXM-149
PEB-296
PEB-310
PXC-006
PSZ40PO60FMC
PBA-170
PNY-564
PXB-392
PBK-103
PBH-434
PSZ30PO50FMC
PXM-150
PNX-498
PEB-184
PEB-097
PNW-485
PNY-190
PNY-191
PNW-391
WA21D040D025
PNY-192
PBH-391
Tonearm assembly
Control board assembly
Carriage board assembly
Mechanism base board assebmly
Panel assembly
Control button
Screw
S/S button unit (STOP, PLAY)
S/S spring
Power button (POWER)
Push button (SIZE, SPEED)
Panel cover
Turntable platter
Turntable sheet assembly
Motor pulley
Motor assembly
Belt
Absorber
Shaft assembly
’ Screw
Screw
Carriage
Solenoid assembly
Plate spring
Slide spring
Screw
Drive motor
Motor pulley
Absorber
Belt
Worm unit
Pulley
Slit plate
Collor
Washer
Worm wheel
Tension spring
Mark
kt
AN ot
A
*
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
101.
102.
103.
104.
105.
106.
107.
108.
109.
110.
111.
112.
113.
114,
115.
116.
117.
118.
119.
Part No.
WT31D054D025
PLB-280
PXB-393
PBA-125
PBA-159
PTX-085
PDF-224
PDX-016
PEB-279
PXA1006
PXC-009
PEB-331
PBA-159
N93-603
PEB-330
IPC30P100FMC
PXV-973
Decription
Washer
Guide bar
Pulley assembly
Wire unit
Screw
Screw
Power transformer assembly
AC power cord assembly
PU cord assembly
Rubber
Dust cover assembly
Hinge
Insulator
Screw
45 adaptor
Insulator
Screw
Cartridge (without stylus)
Metal supporter
IC board (A) assembly
IC board (B) assembly
Switch board {A) assembly
Switch board (B) assembly
Switch board (C) assembly
Name plate
Shaft metal
Spindle
Spindle base
Washer
Steel bal! 94 SLIJ
Shaft base
Solenoid cap
UP spring
Mechanism base unit
Under base
Stylus
Shield plate
411
6. PACKING
Parts List of Packing
Mark No. — Part No.
PRE1002
PHA-200
PHA-201
PHG1010
PNY-479
Ore ONS
WC40FMC
223-001
PBA-186
PEA-073
OND
Description
Operating instructions
Protector (L)
Protector (R)
Packing case
Clamper
Washer
Mirror mat sheet
Screw
Turntable sheet assembly
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8. SCHEMATIC DIAGRAM 1c ic
SWITCH BOARD (A) —- BOARD (A) BOARD (B)
ASSEMBLY ASSEMBLY ASSEMBLY
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BOARD
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CAPACITORS:
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PWZ1022
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capacitor.
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S101:
POWER
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The
A
mark
found
on
some
component
parts
indicates
the
im-
SW
BOARD
(B)
UNIT
portance of the safety factor of the part. Therefore, when replacing,
be
sure
to
use
parts
of
identical
designation.
S401:
REST
LRAPION)—
LAPH(OFF)
# marked capacitors and resistors have parts numbers.
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(C)
UNIT
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is
the
basic
schematic
diagram,
but
the
actual
circuit
may
vary
S501:
SIZE
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~
30cm
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POINT
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rpm
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|
VRI: 45 RPM ADJ VR2: 33 RPM ADI |
aS (PHONO MOTOR INTERFACE SECTION) a
Q2 : PHONO MOTOR
INTERFACE
O
o
° o
Oo Oo I
SANZ
RKN-O7!
LR
ae
CD
eae
|
Lees
a
§
‘
nv
20mA =
LEAD
IN
Q301
28C1740S
|
LEAD
OUT
Q302,303
|
2s01468S
Q304 GP-1A01 |
————
sror
[stant
cn
Ic1
pod2014
O1~4
DSAIAI
x!
KBR-4.0M
I¢3
BA6251
05
SLH-S6VC3H
x2
KBR-
BOOH
Ic4@ M54547P 06 SLH-56VT3H SINS6 PSG-063
07 SLH-56YC3H VR! VRTG6VSIO3
‘
Q1 2549335 D8, 13 ~ 16 VR2 VRTGEVS223
i
a2
2SA1266-G
188131
H 010 RO7.5EB:
MOTOR
|
PXM-149
ones
fe
EN

PL-X420(BK)
9. ELECTRICAL PARTS LIST
NOTES:
© When ordering resistors, first convert resistance values into code form as shown in the following examples.
Ex. 1 When there are 2 effective digits (any digit apart from 0), such as 560 ohm and 47k ohm (tolerance is shown by J =
5%, and K = 10%).
56022 56 X 10! 561
47kQ 47 X 103
0.52 ORD sisiivivsiescdcitadviovie Abadisiecs ovens
RDI4PS3 fe) OJ
ATS civicssel sesiutea tas eos RDI4PS4 O08 J
RN2AO) BG) K
12 lO kernal asl evant, RSIPQU WK
Ex. 2 When there are 3 effective digits (such as in high precision metal film resistors).
5.62kQ. 562X10' ‘5621
RNIASR OO AO F
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 * * and *.
* * GENERALLY MOVES FASTER THAN *
This classification shall be adjusted by each distributor because it depends on model number, temperature, humidity, etc.
¢ Parts marked by “®” are not always kept in stock. Their delivery time may be longer than usual or they may be unavail-
able.
Miscellaneous Parts
Mark Symbol & Description
A Control board assembly
IC board (A) assembly
IC board (B) assemiby
SW board (A) assembly
SW board (B) assembly
SW board (C) assembly
Carriage board assembly
Mechanism base board assembly
AC power cord
%& *& Drive motor
%& & Phono motor
Solenoid assembly
PU cord assembly
193
Part No.
PW2Z 1022
Non supply
Non supply
Non supply
Non supply
Non supply
PWX-101
PWX 1002
PDG-037
PXM-150
PXM-149
PXM-392
PDX-016
Contorl Board Assembly (PWZ 1022)
SEMICONDUCTORS
Mark Symbol & Description Part No.
*k* 1C3 TR-Array BA6251
kk 1C4 Motor driver M54547P
kk 1C1 IC PD2014
A &*® Q2 2SA1286
kk Q1 2SA933S
A * DI1-D4 DSA1A1
(DSA1A2)
D10 RD7.5EB1/EB2
D7 LED SLH-56YC3H
D6 LED SLH-56VT3H
DS LED SLH-56YC3H
D8, D13 — D16 18S8131
SWITCHES
Mark Symbol & Description Part No.
*&x* S1—S6 = Tact switch PSG-063
COIL
Mark Symbol & Description Part No.
L1 Axial coil LALO3T220K
CAPACITORS
Mark Symbol & Description Part No.
cg, C10 CCDSL470J50
C3, C4 CEA1ROM50
C5, C7 CEA100M25
cs CEA220M16
Ccé6 CEA3RM50
C2 CKDYF103Z50
C1 PCL-069
RESISTORS
Mark Symbol & Description
* VR2 Semi-fixed (22kQ)
* VR1 Semi-fixed (10k)
A R1 Metal Oxide
Other resistors
OTHER
Mark Symbol & Description
x1 Ceramic resonator
IC Board (A) Assembly
SEMICONDUCTOR
Mark Symbol & Description
A &*® IC5 Requrator IC
IC Board (B) Assembly
SEMIDONCUCTOR
Mark Symbol & Description
A ** IC6 Regurator IC
SW Board (A) Assembly
SWITCH
Mark Symbol & Description
2, %&* $101 Push switch
CAPACITOR
Mark Symbol & Description
C101
SW Board (B) Assembly
SWITCH
Mark Symbol & Description
*&* S401 Slide switch (REST SW)
SW Board (C) Assembly
SWITCH
Mark Symbol & Description
% * S501, S502 Push switch
(SIZE, SPEED)
20
Part No.
VRTG6VS223
VRTG6VS103
RS2LMF101J
RD1/6PMOOOJ
Part No.
KBR-4.0M
Part No.
NJM7812A
Part No.
NJM78M05A
Part No.
PSG-059
Part No.
CKDYF473Z50
Part No.
PSH-005
Part No.
PSG-060
Mechanism Base Board Assembly (PWX1002)
SEMICONDUCTORS
Mark Symbol & Description
** 0304
** 0301
** 0302, Q303
CAPACITORS
Mark Symbol & Description
C303
C301, C302
C304, C305
RESISTORS
Mark Symbol & Description
All resistors
OTHERS
Mark Symbol & Description
J11,JA2 Jack (REM)
Carriage Board Assebmly (PWX-101)
SEMICONDUCTORS
Mark Symbol & Description
** Q201
* D201
RESISTORS
Mark Symbol & Description
* VR201 Semi-fixed 20k2-B
Other resistors
Part No.
GP-1A01
2S8C1740S
2SD1468S
Part No.
CEA2R2M50
CKDYF103Z50
CKSYF4722Z50
Part No.
RD1/6PMOooOoJ
Part No.
RKN-071
Part No.
EE-SJ3-B
DSA1A1
(1SR35-100A)
Part No.
PCP-083
RD1/6PMOOOJ

10. TROUBLESHOOTING
a)
| =] oD €-t—1 8] ( =), @)
Connect the unit to the amplifier and
speakers.
Set the speed
selector to '45’’, and turn
on the power.
NO
Is the UP LED ON?
YES
NO
a Is the initial reset OK?
YES
NO
The tonearm returns to the rest,
only, the UP LED is ON,
the phono motor is OFF
Is the phono motor stationary?
Do the REP SW and others work?
Set a 17-cm record on the turntable.
Press the slide base into the closed
position and press the P/S switch.
YES
"
Ss
YE
Does the tonearm go to the 17cm
position?
YES Does the tonearm stay at the center of NO
the record?
YES
NO
Does the EV down function?
YES
Does the tonearm track?
YES
Does the phono motor change speeds
(33/45)?
YES
YES
|
YES
21
Both ands of C3 and
C4 and J1, J2 etc.
Check 12V and 5V lines
Doesn't perform
initial reset
The switches don’t work
The phono motor doesn’t start/stop
The tonearm doesn’t move
Does the tonearm go DOWN at the 30cm NO
position?
YES
Check the 30cm size sensor
The tonearm doesn’t
detect bands while UP
EV operation failure.
It doesn’t change
speeds (33/45)
Check the address sensor
22

=) eC T—1 8] 1 =), @)
Doesn't perform The tonearm doesn’t
initial reset move
YES
YES
|
i
ly
11V
lied
Does the tonearm move toward Does the tonearm stop at the us : Are the tor belt and th S approximately applie
rae p Initial reset is complete (OK) nee wie Broperly barca to both terminals of the
; tonearm drive motor?
NO NO
Perform error, pattern and NO ; ;
soldering
checks
on
D70,
R31,
Is
1C1
pin
33
about
5V?
Is
IC1
pin
38
“L"'?
Portoin:
orrar:
patter
and
i
‘
NO]
Does
the
motor
turn
when
the
Is
approximately
11V
applied
|YES
|
Perform
soldering
and
wiring
Core sene Hot, hen fon cchauke acai ec: otanenee belt is removed? to CN2 (male) pins 4 and 5 checks from J301 to the
YES YES SW (S401) to J5 — IC1 pin 38. VES ene has been discon- motor
When the tonearm doesn't NO
move toward the outside edge
of the record
Perform error, pattern and NO] When looking at the wave-
soldering checks around the forms of IC1 pins 31 and 32
Check mechanism parts i.e.
ceramic lock
can the oscillation waveforms canine gear, wheel, wire,
be
seen?
“’4MHz”’
NO
:
aoe
;
Os Are IC1 pins 11 and 12 “H’’? Perform error and soldering Is 1C1 pin 38 ““H"? Perform checks from IC1 pin
YES checks from IC1 pins 11 and 38 to J5 and the rest SW, and
Perform error check on L1 YES 12 to IC4 pins 4 and 5.
and C7 and micro computer
The tonearm doesn’t The switch
move doesn’t work
NO
5V line check
Are both IC4 pins 11 and 14 Perform error and soldering
about 11V? checks from IC4 pins 11 and
YES
Checking IC1 pins 11 and 12
Both are ‘’H” Both are “L”’
R20.
When one is “L”
and one is “‘H”
14 to CN2, J301, J302, and
the drive motor
Perform pattern, connection,
and soldering checks from IC1
pins 11 and 12 to !IC4 pins 4
and 5, 11 and 14, and CN2
(male) pins 4 and 5
Perform pattern and connec-
tion checks on IC1 pin 40
Perform pattern and soldering
checks from IC1 pins 11 and
12 to IC4 pins 4 and 5
Is 1C1 pin 13 “L''?
Perform wiring and soldering
checks from the drive motor
(PXM-150) to J302, J301
and CN2.
Is 1C1 pin 40 “L'’?
Check proximity of IC1 pin
40 and pin 13
Switches don’t work
LED check
Light the LED you are about
to check
When each switch is pushed
with the power off do their
terminals short out?
Switch check
(With an oscilloscope) For
instance when the REP LED is
ON, does IC1 pin 24 become pot
“L' when pin 19 timing is __,
“Lt? @
YES
Perform pattern error and
soldering checks from IC1 pins
17 — 29 to the SW LED, and
R26, R21 — 23 check.
ON does IC1 pin 19 become aa
“L’™ when pin 27 timing is
ope? a | |
YES
LED check
(With an oscilloscope) For in- H
stance when the REP SW is ® | [ L
H
L
Is the voltage at both terminals
of the LED (D6) 2V when
1C1 pins 19 and 24 are simul-
taneously “L’’?
Perform a pattern check of
connections to Q1 and the
LEDs.
LED check

Note:
e The EV is up while the tonearm is on the
arm rest, and will not go down in that state.
|
EV Sw. ON ON
pa to
(oe) (oe)
tec!
® |
ee, Seek
1C1 | | i
|
io |
UP uP
8V
i
|
1 I
Mechanism check,
check to see
if the solenoid
plunger is catch-
ing on something
I
Approximately
I
| Approximately
!
8V
o | |
\
' i (
“| ze
|
\
|
—4 —+- 1v
i}
i es
— 1V
YES
The EV doesn’t perform
Place a record on the turntable and using
the locate switch, move the tonearm to
the selection position
Does the UP LED go ON and OFF when
the EV SW goes ON and OFF?
YES
Do IC1 pins 9 and 10 alternately become
“H"" and “L” when the EV SW is turned NO
ON?
YES
At that time do IC4 pins 7 and 8 change NO
from approximately OV to approxi-
mately 8V?
YES
At that time do !C4 Jins 9 and 10
change from approximately 12V to
approximately 1V?
NO
YES
At that time were the voltage readings
at the anode of D201
12V
———— Approximatel
Holding the 8V
Approximately
Drawing the rod in 1V
Unsolder the EV solenoid lead and make
sure the solenoid wire wound resistor
measures approximately 702
YES
NO
(Be careful of which direction D201 is
facing) Disconnected CN3 (female), is
the resistance approximately 702 be-
tween pins 2 and 3?
Perform error and pattern checks from
IC4 pins 9 and 10 to R1 and CN3 pin 3
PL-xX420(BK)
The switch doesn’t work
Perform pattern and soldering checks
from IC 1 pins 9 and 10 to IC3 pins 5
and 6
Perform pattern and soldering checks
from IC3 pins 5, 6, 11, 12 to IC4 pins
7 and 8
Perform error and
patterns checks from
IC4 pins 9 and 10 to
R1 and CN3 pin 3
OK
Is CN3
properly
connected?
Perform error pattern break, soldering,
connection checks from CN3 (female)
to J201, D201 and solenoid.
Solenoid check
Perform error and pattern checks from
CN3 (female) and J201 and D201
25

) >, €- 7-18 /1=1.@)
The tonearm doesn’t
track
Set the tonearm for playing
oO
Perform pattern check from Is IC3 pin 2 “L’'?
IC1 pin 13 to IC2 pin 1, and
check R23 YES
NO
Perform pattern and soldering Is 1C4 pin 15 “H’'?
checks from IC3 pin 15 to
IC4
pin
15
and
R4
YES
- nee NO Perform pattern check from 1C1 pins 11 and 12 to
Are IC4 pins 4 and 5 “L"’? IC4 pins 4 and 5
YES
(Put the tonearm on the EV bar
Put the tonearm UP V groove)
YES
Does the voltage between TP | NO
(CNS) pin 1 (TRKG) and GND Readjust the tracking sensor
measure approximately 1.1V?
NG
YES
When the tonearm is moved | NO Perform error and pattern checks on the carriage base
manually does the TRKG out- board and connection and short circuit checks from
put change? J201 to CN3 pind
YES
Perform error and pattern checks
around RQ, 10, 11, 12 and IC3
pins 1, 2 and 3
Size SW does not function
Check $501, perform pattern check
from $501 to J4, pins 5 & 6 and 1C1, pin
5, and check H.B.
" Size switch ($501) <30> —IC1, pin 5 | NO
“Ln?
<17> >1C1, pin 5 “H"?
Address sensor check
26

Check the connections of speakers and
PU cord
Does the tonearm track? Position the
tonearm to the right of the record and
manually move the pick-up unit toward NO
the center of the record. Does the
carriage move?
TT: turntable
Set playing by EV DOWN
oO
1C1, pin 16 “L"? e
YES
1C3, 13 pin “H"? NO
YES
Remove PU lead and PU cord to operate
the tonearm EV. Does the resistance
between R and RG, and between L and
LG change to 0?
YES
0302, 303, C303, R303-306 mounted
correctly? H.B. and adjacent pattern
OK?
OK
Check the PU lead inside the tonearm,
the cartridge connection unit, and the
cartridge.
OK
Change the stylus
PL-x420(BK)
The tonearm doesn't
track
Perform pattern check of R26 from IC1,
pin 16 to IC2, pin6
Perform pattern check of R302 from
1C3, pin 13 to J301, pin 2
27

| 7-18 (=)
Checking the address
sensor
Check while moving the tonearm with
the locate switch
(Using an oscilloscope) Does the wave-
for form of J301 pin 3 resemble the
waveform shown below?
ov COLL
ov
Check the connections of the J301
connector assembly
The phono motor
won't start
Using the locate SW move the tonearm
away from the rest
Is C1 pin 15 “L’’?
YES
ls IC3 pin 16 “H’’?
YES
is IC3 pin 10, OV?
Is Q2 C—E voitage approximately OV?
28
When the tonearm
doesn’t move
The tonearm doesn’t
move
Disconnect the CN2 (female) and with
pin 1 at GND apply 5V to pin 2. Turn NO
the worm gear manually. Does the wave-
form at left appear?
Check the pattern from CN2 (male) pin
3 to IC1 pin 39
NO Perform pattern check from 1C1 pin 15 NO
to IC3 pin 1, and mismounting R6
NO Perform pattern check from IC3 pin 16 ue
to 7, and mismounting R7
NO Perform error and pattern checks from A
1C3 pin 10 to R29, R30 and Q2
Perform error and pattern checks from
Q2 to CN4
Perform check on the phono motor
(Check the mechanism base board as-
sembly) Check Q304 and R307 for
errors and then check the patterns in
those areas
The phono motor
won't stop
Using the stop switch move the
tonearm back to the rest
is 1C1 pin 15 “H"?
YES
Is IC3 pin 16 “LL?
YES
ts 1C3 pin 10 “H"?
YES
is Q2 C—E voltage approximately 12V?
YES