Pioneer PD-M423 User manual

d) PIONEER’
The Art of Entertainment
Service
anual
MULTI-PLAY COMPACT DISC PLAYER
PD-M423
PD-M403
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
Type Power Requirement
ORDER NO.
RRV1062
CONTENTS
1. SAFETY INFORMATION -oescccsssccceeeeseeseetsseeeeeeees 2
2. PACKING AND PARTS LIST -ecccccrcessereeeeeeetrereeees 3
3. EXPLODED VIEWS AND PARTS LIST ----------+--++-- 4
4. BLOCK DIAGRAM ceccecceeecececetseessttaeeceeeneeeseneens 10
5. SCHEMATIC DIAGRAMGccrsrccereessesrrreeceeeeeeeeesenes 1
6. PCB CONNECTION DIAGRAM -:+-sseseceececeeeeeeeeees 17
7. PCBPARTS LIST --:::s::ccccccccceteeeeeeeeeeseesseeseeeeees 23
8. ADJUSTMENTS cvrvcrsccercrsesteeccsecttennseteeeeeeesoesens 25
9. IC INFORMATION eee ee eee eee rere rere ree ee eee rere 34
10. FL INFORMATION «++:-::seseeeeessereeeeeeeessssseessnenees 39
11, FOR PD-M423/KCXJ, PD-M403/KUXJ
AND KOXJ stcccsessscceceeeeteceeseetsensessssnerseeeeeeereenens 40
12. PANEL FACILITIES +--:::::::sssccesececesessesssnseeenseeees a4
13. SPECIFICATIONS r--:eeeeeeeeseeeeeeeeeeeessnseseeneeeeees 42
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.
PIONEER ELECTRONICS OF CANADA, INC. 300 Allstate Parkway Markham, Ontario L3R OP2 Canada
PIONEER ELECTRONIC [EUROPE] N.V. Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS AUSTRALIA PTY. LTD. 178-184 Boundary Road, Braeside, Victoria 3195, Australia TEL: [03] 580-9911
© PIONEER ELECTRONIC CORPORATION 1994
T - SSF FEB. 1994 Printed in Japan®

PD-M423, PD-M403
1. SAFETY INFORMATION
This service manual is intended for qualified service technicians; it is not meant for the casual
do-it-yourselfer. Qualified technicians have the necessary test equipment and tools, and have been
trained to properly and safely repair complex products such as those covered by this manual.
Improperly performed repairs can adversely affect the safety and reliability of the product and may void
the warranty. If you are not qualified to perform the repair of this product properly and safely, you should
not risk trying to do so and refer the repair to a qualified service technician.
WARNING
Lead in solder used in this product is listed by the California Health and Welfare agency as a known reproductive toxicant which
may cause birth defects or other reproductive harm (California Health & Safety Code, Section 25249.5).
When servicing or handling circuit boards and other components which contain lead in solder, avoid unprotected skin contact with
the solder. Also, when soldering do not inhale any smoke or fumes produced.
NOTICE
(FOR CANADIAN MODEL ONLY)
Fuse symbols -§&—1 (fast operating fuse) and/or -§—— (slow operating fuse) on PCB indicate that replacement parts
must be of identical designation.
REMARQUE
(POUR MODELE CANADIEN SEULEMENT)
Les symboles de fusible -§—H (fusible de type rapide) et/ou -§£— (fusible de type lent) sur CCI indiquent que les
piéces de remplacement doivent avoir la méme désignation.
(FOR USA MODEL ONLY)
1. SAFETY PRECAUTIONS
The following check should be performed for the
continued protection of the customer and service
technician.
LEAKAGE CURRENT CHECK
Measure leakage current to a known earth ground
(water pipe, conduit, etc.) by connecting a leakage
ANY MEASUREMENTS NOT WITHIN THE LIMITS
OUTLINED ABOVE ARE INDICATIVE OF A PO-
TENTIAL SHOCK HAZARD AND MUST BE COR-
RECTED BEFORE RETURNING THE APPLIANCE TO
THE CUSTOMER.
2.PRODUCT SAFETY NOTICE
current tester such as Simpson Model 229-2 or
equivalent between the earth ground and all exposed
metal parts of the appliance (input/output terminals,
screwheads, metal overlays, contro! shaft, etc.). Plug
the AC line cord of the appliance directly into a 120V
AC 60Hz outlet and turn the AC power switch on. Any
current measured must not exceed 0.5mA.
Reading should
Leakage | Ot be above
current | 0.5mA
tester
Sd
Test all
exposed metal
surfaces
Also test with
plug reversed
(Using AC adapter
plug as required)
Earth
ground
AC Leakage Test
Many electrical and mechanical parts in the appli-
ance have special safety related characteristics. These
are often not evident from visual inspection nor the
protection afforded by them necessarily can be ob-
tained by using replacement components rated for vol-
tage, wattage, etc. Replacement parts which have
these special safety characteristics are identified in
this Service Manual.
Electrical components having such features are
identified by marking with a A on the schematics and
on the parts list in this Service Manual.
The use of a substitute replacement component which
dose not have the same safety characteristics as the
PIONEER recommended replacement one, shown in
the parts list in this Service Manual, may create shock,
fire, or other hazards.
Product Safety is continuously under review and
new instructions are issued from time to time. For
the latest information, always consult the current
PItONEER Service Manual. A subscription to, or ad-
ditional copies of, PIONEER Service Manuai may be
obtained at a nominal charge from PIONEER.

PD-M423, PD-M403
2. PACKING AND PARTS LIST
NOTES:
e Parts marked by “NSP” are generally unavailable because they are not in our Master Spare Parts List.
e 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 designation.
Parts marked by “@” are not always kept in stock. Their delivery time may be longer than usual or they may be unavailable.
Parts List
Mark No. Description Part No. Mark No. Description Part No.
1 Connection Cord with PDE — 319 9 CD Packing Case PHG1999
Mini Plug (for SR cord) 10 Mirror Mat Sheet Z23 — 007
2 Connection Cord with PDE1109
Pin Plug (for Audio) NSP 101. Dry Cell Battery VEM — 022
3 Remote Control Unit PWW1089 (RO3, AAA)
4 Battery Cover PZN1010
5 Magazine Assy PXA1523
6 Operating Instructions PRB1205
(English)
7 Styrol Protector (F) PHA1276
8 Styrol Protector (R) PHA1277 2

PD-M423, PD-M403
3. EXPLODED VIEWS AND PARTS LIST
NOTES:
e Parts marked by “NSP” are generally unavailable because they are not in our Master Spare Parts List.
¢ 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 designation.
Parts marked by “©” are not always kept in stock. Their delivery time may be longer than usual or they may be unavailable.
3.1 EXTERIOR
Parts List
Mark No. Description
A Strain Relief
2 32P F.F.C/30V
A 3 Power Transformer
A 4 Power Cord with Plug
5 Bonnet
6 Foot Assy
7 Screw
8 Rubber Sheet
9 Function Panel
10 Play Button
11 Name Plate
12 Power Button
13 65 Label
14 Track Button
15 Display Window
16 Spring (Door)
17 Earth Lead Unit
18 Door
19 Function Board Assy
A 20 Mother Board Assy
21 Screw
22 Screw
23 «Screw
24 Screw
25 earees
96) osevade
27 Screw
28 Screw
Part No.
CM — 22C
PDD1041
PTT1237
PDG1015
PYY1149
AEC1531
IBZ30PO080FCC
AEBI111
PNW2387
PAC1766
PAM1608
PAC1719
ORW 1069
PAC1765
PAM1635
PBH1022
XDF — 502
PNW2264
PWZ2769
PWM1858
BBZ30P060F MC
BBZ30P080FZK
PPZ30P120FMC
FBT40P080FZK
IBZ30P180FMC
PDZ30P050F MC
Mark No.
NSP 101
NSP 102
NSP 103
NSP 104
NSP 105
NSP 106
Description Part No.
PCB Mould AMR1525
Under Base PNA1751
Rear Base PNA2068
Multi Mechanism Assy PXA1532
Flat Cable (6P) D20PY YO615E
Switch Board Assy PWZ2804

PD-M423, PD-M403
Exterior
NOTE:
Screws
adjacent
to
V
mark
on
the
product
are
used
for
disassembly.
Multi Mechanism Assy
(= See section 3.2)

PD-M423, PD-M403 | ° ° ‘ : : °
3.2
MULTI
MECHANISM
ASSY
2
*1: Fix the motor 101 on the loading board assembly 105 so that
the label attached on the motor faces the direction illustrated. _~°
2
*1 Label
A
=
*2: Fix the motor 101 on the motor board
10 assembly 110 so that the label
attached on the motor faces the
direction illustrated.
B
=
C
=
© How to install the disc table
(0) Usenippers or other tool tocut the three sections
marked ® and the three sections marked ® in
figure. Then remove the spacer.
[2] While supporting the spindle motor shaft with
the stopper, put spacer on top of yoke M, and
stick the disc table on top (takes about 9kg press-
ure). Detach the spacer.
D

PD-M423, PD-M403
Parts List
Mark No. Description Part No. Mark No. Description Part No.
1 Motor Pulley PNW 1634 49 Guide Bar PLA1094
2 Gear Holder PNW1929 50 __ Disc Table PNW 1067
3 PU Frexible Cable PNP1343 51 Gearl PNW2052
4 Cam Gear PNW1923 52 Gear2 PNW2053
5 Belt PEB1138 53 Gear3 PNW2054
6 Top Guide N PNW 2441 54 Pinion Gear PNW2055
7 ~~ Gear Pulley PNW1918 55 PWB Holder PNW2057
8 GearS PNW1919 56 Carriage Base PNW2445
9 GearL PNW1920 57 D.C. Motor Assy PEA1235
10 Eject Spring PBH1107 (spindle with oil)
11 Switch Lever PNW1927 58 Pickup Assy PEA1291
12 Seven Bar PNW1931 59 Disc Table Assy PEA1035
13. Sub Rotary Lever PNW 1933 60 Screw BBZ26P060FMC
14 Sub Rotary Lever Spring PBH1111 61 Screw BPZ20PO60FMC
15 Rotary Lever PNW1932 62 Screw BPZ26P100FMC
16 Drive Plate PNW1930 63 Screw JFZ17P025FZK
17. Motor Screw PBA- 112 64 Screw JFZ20P040FMC
18 Holder Lever Spring PBH1110 65 Washer WT12D032D025
19 Disc Holder PNW1924 66 Connector Assy PDE1241
20 Cushion A PED1001 67 Stopper Spring PBH1131
21 ~Holder Lever PNW1925 68 Stopper PNW2069
22 Float Rubber PEB1014 69 D.C. Motor Assy PEA1246
23 + Float Rubber PEB1132 (CARRIAGE)
24 ~~ ‘Float Screw PBA1073 70 Upper Chassis PNB1267
25 Release Lever PNW1934 71 Sub Chassis PNW2440
72 Connector Assy PDE1240
26 Release Spring PBH1106
27. ~=Clamper Cam PNW1922
28 Clamper Holder PNW1921
29 ~Clamper Spring PBH1109
30 Clamper PNW1857
NSP 101 Motor VXM1033
31 Lock Lever PNW1917 NSP 102 Eject Lever PNB1306
32 Lock Spring PBH1108 103 eee
33 Stair NL PNW2443 NSP 104 Servomechanism Assy M PXA1512
34 Stair NR PNW2444
35 Synchronize Lever PNW1926 NSP 105 Loading Board Assy PWZ2038
106 eovovee
36 Motor Assy PEA1130 107 «eee8
(LOADING, DISC SELECT) NSP 108 Main Chassis PNW2074
37. Screw PMZ26P040FMC NSP 109 Select Board Assy PWZ2533
38 Screw PPZ30PO080FMC
39 Screw BBZ30P060FMC NSP 110 Motor Board Assy PWZ2040
NSP 111 Mechanism Board Assy PWX1192
40 Washer WT26D047D025 NSP 112 Earth Lead Unit PDF1074
41 Washer WA31D054D025 NSP 113 Clamp Magnet PMF1014
42 ERing Z39-010 NSP 114 Gear Stopper PNB1303
43 Screw IPZ30PO80FMC
NSP 1t1S YokeM PNB1312
44 Rubber Spacer PEB1238 NSP 116 AVAngle PNB1405
45 Rubber Spacer PEB1179 NSP 117 Carriage DC Motor/0.3W PXMI1027
46 Silent Ring PBK1093
47 Washer WA62D130D025
48 Earth Spring PBH1132

PD-M423, PD-M403
BLOCK DIAGRAM 4.
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5. SCHEMATIC DIAGRAM
5.1 Waveforms
*1 SOT- JUMP:After switching to the pause mode, press the
Note: The encircled numbers denote measuring points in the
schematic diagram.
TP1- Pin 1:PLAY MODE
(2) (RF)
500mVidiv SO0Onsec/div
TP1- Pin 1: TRACK SEARCH MODE
(RF)
500mV/div 200 yu sec/div
2.600028 88)
TP1- Pin 6:PLAY MODE
(3) (FOER)
100mV/div 1Omsec/div
TP1-Pin 2:PLAY MODE
(TRER)
WVidiv 10msec/div
TP1- Pin 2:50T- JUMP (*1) MODE
(TRER)
1Vidiv 1msec/div
manual search key.
*2 FOCUS - IN:Press the key without loading a disc.
IC202- Pin 3 :FOCUS - IN (*2) MODE
(FODR)
1Vidiv 200msec/div
IC202- Pin 3 :PLAY MODE
(FODR)
1Vidiv 1msec/div
IC202- Pin 4:PLAY MODE
6) (TRDR)
500mVidiv
1msec/div
1C202- Pin 4:50T - JUMP (*1) MODE
(TRDR)
500mVidiv 1msec/div
IC201- Pin 9:PLAY MODE
7) (SPDR)
1Vidiv 50Omsec/div
IC201 - Pin 8: TRACK SEARCH MODE
(SPDR)
2Vidiv 50msec/div
IC202- Ping :PLAY MODE
(CADR)
0.5Vidiv 2sec/div
1C202- Ping : TRACK SEARCH MODE
(CADR)
2V/div 200msec/div
1C151-Pin 32:PLAY MODE
(EFM)
2Vidiv 500nsec/div
1C401-Pin 7 :PLAY MODE (1kHz)
(LO ) (D/A DATA OUT)
1V/div 200 psec/div
1C401-Pin 8 :PLAY MODE (1kHz)
(1) (LO ) (D/A DATA OUT)
div 200 i 1V sec/div
1C301-Pin 22 :PLAY MODE (1kHz)
(BCLK)
2V/div 500nsec/div
(aa al ol eel cael a coe el oo
ey
1C301-Pin 20 :PLAY MODE (1kHz)
(LRCK)
2Vidiv 10 usec/div
1C301-Pin 21 :-PLAY MODE (1kHz)
(PCMD)
2V/idiv 5O0Onsec/div
Pin- OUTPUT:PLAY MODE(1kHz)
1Vidiv 200 usec/div
STRACK SEARCH MODE
Upper: TP1- Pin 1 (RF) 1V/div
Lower: IC 151- Pin 29 (MIRR)
2Vidiv 200 usec/div
eee tee eee
t
:PLAY MODE
Upper: TP1- Pin 1 (RF) 1V/div
Lower: 1C151- Pin 30 (DFCT)
SVidiv 200 usec/div
1C301-Pin 3 :PLAY MODE
3) (MDP)
2Vidiv 2 usec/div
(Upper)
— GND
~— GND
(Lower)
!1C301-Pin 9 ;:PLAY MODE
(PCO)
2Vidiv 10 usec/div
NOTE FOR SCHEMATIC DIAGRAMS (Type 4A)
1.
When ordering service parts, be sure to refer to
“PARTS LIST of EXPLODED VIEWS” or “PCB
PARTS LIST”.
. Since these are basic circuits, some parts of them or the
values of some components may be changed for improve-
ment.
. RESISTORS:
Unit: k:kQ, M:MQ, or 9 unless otherwise noted.
Rated power: 1/4W, 1/6W, 1/8W, 1/10W unless otherwise
noted.
Tolerance: (F): +1%, (G): +2%, (K): +10%, (M): +20% or +5% un-
less otherwise noted.
. CAPACITORS:
Unit: p:pF or wF unless otherwise noted.
Ratings: capacitor (uF)/ voltage (V) unless otherwise noted.
Rated voltage: 50V except for electrolytic capacitors.
. COILS:
Unit: m:mH or wH unless otherwise noted.
. VOLTAGE AND CURRENT:
LoJor-v:
DC voitage (V) in PLAY mode unless otherwise noted.
© mA or+ mA:
DC current in PLAY mode unless otherwise noted.
Value in( ) is DC current in STOP mode.
OTHERS:
© @or®@ : Adjusting point.
© <<]: Measurement point.
© The A mark found on some component parts indicates the im-
portance of the safety factor of the parts. Therefore, when re-
placing, be sure to use parts of identical designation.
- SCH—O ON THE SCHEMATIC DIAGRAM:
e SCH—D indicates the drawing number of the schematic dia-
gram. (SCH stands for schematic diagram.)
- SWITCHES (Underline indicates switch position):
FUNCTION BOARD ASSY
S701: EJECT
S702 : REPEAT
S703. : PROGRAM
S704: DISC
S705: kKKI- <j
S706: b> - Dot
S707 : STOP
s7os : >/(0
S709 : RANDOM
S710 : HI-LITE SCAN
SWITCH BOARD ASSY
S80t : POWER
PD-M423, PD-M403
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6. PCB CONNECTION DIAGRAM
A)
s) =
iS
w
MOTHER BOARD ASSY
e
This
diagram
Is
viewed
from
the
mounted
parts
side.
LOADING
BOARD
ASSY
A
AC
POWER
CORD
AC
120V
60Hz
SHaMaRY
:
SELECT
BOARD
ASSY
a
8
©
NOTE
FOR
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PD-M423, PD-M403
7. PCB PARTS LIST
NOTES:
e Parts marked by “NSP” are generally unavailable because they are not in our Master Spare Parts List.
e 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 designation.
e Parts marked by “@” are not always kept in stock. Their delivery time may be longer than usual or they may be unavailable.
© 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%).
560 Q > S56X LO PSG] corre reece cere rte cere ee neeeee RD1/8PM[5][6]{1]J
Vy) 0 ne oa ee ok ee RD1/4PS [4][7][3]J
0.5 ORS ceccrcccccecc eee e sence neces eeeeeteeeeeceees RN2H [O}[RI[S]K
1Q ce]: siete aie ea elbS as ered Slee a «Bee seine we Meee eraews RS1P[0][1][0]K
Ex.2 When there are 3 effective digits (such as in high precision metal film resistors).
562k Q—> 562 X LO P5621] cer ccc cece eect e teen eee eeeeeee RN1/4PC[5][6][2][1]F
Mark No. Description —S-_—— PartNo. Mark No. __Description _—§-_—— PartNo.
LIST OF ASSEMBLIES CAPACITORS
C11, C13 CERAMIC CAPACITOR CKCYF103Z50
aA MOTHER BOARD ASSY PWM1858 C15 CERAMIC CAPACITOR CKCYF103Z50
C155 CERAMIC CAPACITOR CKCYB561K50
NSP MECHANISM BOARD ASSY PWX1279 C156 CERAMIC CAPACITOR CGCYX333K25
NSP LOADING BOARD ASSY P¥Z2038 C157 CERAMIC CAPACITOR CGCYX103K25
NSP MOTOR BOARD ASSY PWZ2040
NSP SELECT BOARD ASSY P¥Z2533 €158,C159 CERAMIC CAPACITOR CGCYX104K25
C16 CERAMIC CAPACITOR CKCYF103250
NSP SUB BOARD ASSY PWX1336 C160 ELECT. CAPACITOR CEAS4R7M50
FUNCTION BOARD ASSY PWZ2769 C161 CERAMIC CAPACITOR CGCYX104K25
NSP SWITCH BOARD ASSY PWZ2804 C162 ELECT. CAPACITOR CEAS4R7M50
NSP MECHANISM BOARD ASSY PWX1192 C163 CERAMIC CAPACITOR CGCYX104K25
C164 CERAMIC CAPACITOR CGCYX103K25
C167 CERAMIC CAPACITOR CKCYF103Z50
C168 CERAMIC CAPACITOR CGCYX333K25
MOTHER BOARD ASSY C169 CERAMIC CAPACITOR CGCYX103K25
SEMICONDUCTORS C17 CERAMIC CAPACITOR CKCYF103Z50
1C151 SERVO IC CXA1372Q C170 CERAMIC CAPACITOR CKCYB332K50
A 1€201, 1C202 POWER OP-AMP IC LAG520 C171 CERAMIC CAPACITOR CKCYB102K50
A IC21 REGULATOR, IC PQOSRR12 C172 CERAMIC CAPACITOR CKCYB472K50
1C301 EFM DEMODULATION IC CXD2517Q C205,C210 CERAMIC CAPACITOR CKCYF103Z50
1C351 MICROCOMPUTER IC PD4520A
C215 CERAMIC CAPACITOR CKCYF103Z50
1C401 CONVERTER IC TC9268P C218 CERAMIC CAPACITOR CGCYX103K25
1C405 OP-AMP IC NJM4558D-D (219 CERAMIC CAPACITOR CKCYF103Z50
Q301 TRANSISTOR 2803732 C25 ELECT. CAPACITOR CEAS332M16
Q401 N-FET 2SK246 C26 ELECT. CAPACITOR CEAS331M16
Q403,Q404 TRANSISTOR 28D2144S
C27 ELECT. CAPACITOR CEAS330M16
Q405 TRANSISTOR DTC124ES C301 CERAMIC CAPACITOR OGCYX104K25
A D11-D14 DIODE 11ES2 C306 CERAMIC CAPACITOR CKCYB152K50
D352 ZENER DIODE MTZJ5. 1B C307 CERAMIC CAPACITOR CGCYX473K25
D391-D394_ DIODE 18S254 C308 CERAMIC CAPACITOR CGCYX103K25
D401 DIODE 188254
C309 ELECT. CAPACITOR CEASR47M50
aA D52 DIODE L1ES2 C313 CERAMIC CAPACITOR CCCCH100D50
DS4 ZENNER DIODE M1ZJ18B C315 CERAMIC CAPACITOR CKCYF103Z50
C321 CERAMIC CAPACITOR CCCSL10150
COILS C351 ELECT. CAPACITOR CEAS471M6R3
L351 AXIAL INDUCTOR LAU100K
L391 AXIAL INDUCTOR LAUO10K C353, C361 CERAMIC CAPACITOR CKCYF 103250
C403,C404 CERAMIC CAPACITOR CCCCH150J50
C407 CERAMIC CAPACITOR CCCSL101J50
23

PD-M423, PD-M403
Mark No. Description Part No.
C413-C416 AUDIO FILM CAPACITOR CFTYA104J50
C417 CERAMIC CAPACITOR CKCYF103250
C425 CERAMIC CAPACITOR QCCSL101J50
C429,C430 CERAMIC CAPACITOR CCCCHS60J50
C433,C434 ELECT. CAPACITOR CEAS220025
C435-C438 CERAMIC CAPACITOR CCCCH390J50
C441,C442 FILM CAPACITOR PCL1030
(0. 0015/50¥)
C52 ELECT. CAPACITOR CEAS101M35
RESISTORS
VR151, VRI52 VR(22K) PCP1030
OTHER RESISTORS RD1/6PUO D0
OTHERS
CN131 CONNECTOR 12FMZ-ABT
CN202 CONNECTOR VKN1051
CN203 CONNECTOR 4P 4-173981-4
CN204 6P JUMPER CONNECTOR 52147-0610
CN351 CONNECTOR 32P 9604S-32C
JA391 JACK(FOR CONTROL IN) RKN1004
JA392 JACK (FOR CONTROL OUT) RKN1004
JAAO1 JACK(FOR LINE OUT) = PKB1009
X351 CERAMIC OSCILLATOR _ ¥SS1028
x401 CRYSTAL OSCILLATOR — PSS1008
A RAPPING TERMINAL RKC-061
LOADING BOARD ASSY
SWITCHES
$601, S602 PUSH SWITCH DSG1016
OTHERS
CN601 CONNECTOR 4P 4-173979-4
MOTOR BOARD ASSY
OTHERS
CN602 6PJUMPER CONNECTOR 52151-0610
SELECT BOARD ASSY
SWITCHES
$603 DETECTOR SWITCH PSG1010
$604~S606 PUSH SWITCH DSG1016
FUNCTION BOARD ASSY
SEMICONDUCTORS
D701-D703 DIODE 18S133X
SWITCHES
$701-S710 SWITCH PSG1006
OTHERS
v701 FL INDICATOR TUBE PEL1084
CN701 CONNECTOR 32P 9604S-32F
REMOTE SENSOR SBX1785
24
Mark No. Description Part No.
SWITCH BOARD ASSY
SWITCHES
S801 SWITCH PSG1006
MECHANISM BOARD ASSY
OTHERS
(N610 CONNECTOR 4P VKN1061
S610 PUSH SWITCH DSG1016

PD-M423, PD-M403
8. ADJUSTMENTS
8.1. Adjustment Methods
If a disc player is adjusted incorrectly or inadequately, it may malfunction or not work at all even though there is
nothing at all wrong with the pickup or the circuitry. Adjust correctly following the adjustment procedure.
@ Adjustment items/Verification Items and Order
If the specified values cannot be obtained or no adjustment is possible by performing the verifications or adjustments
described in steps 1 — 4, the pickup block may be defective.
[sep [ mem —~—~S—*dCSSCeat Point |__Adlutnant Location
pe!) Focus offset verification TP1, Pin6(FCS. ERR)
oa Tracking error balance verification TP1, Pin2(TRK. ERR)
Pickue radial/tangential direction tilt TP1, Pin 1(RF) Radial as adjustment screw,
adjustment Tangential tilt adjustment screw
; Pani TP1, Pin S(FCS. IN) ‘
Vv :
8 | Focus servo loop gain adjustment TP1, Pin 6(FCS. ERR) R152(FCS. GAN)
: da at TP1, Pin3(TRK. IN)
Vv :
ae Tracking servo loop gain adjustment TP1, Pin2(TRK. ERR) R151 (TRK. GAN)
@ Abbreviation table
FCS. ERR _ :Focus Error
TRK. ERR :Tracking Error
FCS GAN _ :Focus Gain
TRK GAN: Tracking Gain
FCS. IN :Focus In
TRK.IN —:Tracking In
@ Measuring Instruments and Tools
1. Dual trace oscilloscope (10:1 probe)
2. Low-frequency oscillator
3. Test disc (YEDS- 7)
4. Low pass filter (39k Q +0.001 u F )
5. Resistor (100 kQ )
6. Standard tools
25

PD-M423, PD-M403
@ Test Point and Adjustment Variable Resistor Positions
MOTHER BOARD ASSY
VR 151 TP!
TR.GA (eo)
VR1521 CNI31 [ es |
FO.GA](~__] CN201
10151
<> ae
Figure 1. Adjustment Locations
@ Notes
1. Use a 10:1 probe for the oscilloscope.
2. All the knob positions (settings) for the oscilloscope in the adjustment procedures are for when a 10:1 probe is
used.
@ Test Mode
These models have a test mode so that the adjustments and checks required for service can be carried out easily.
When these models are in test mode, the keys on the front panel work differently from normal. Adjustments and
checks canbe carried out by operating these keys with the correct procedure. For these models, all adjustments are
carried out in test mode.
[Setting these models to test mode]
How to set this model into test mode.
1. Unplug the power cord from the AC socket.
2. Short the test mode jumper wires. (See Figure 1.)
3. Plug the power cord back into the AC socket.
When the test mode is set correctly, the display is different from what it usually is when the power is turned on.
If the display is still the same as usual, test mode has not been set correctly, so repeat Steps 1 — 3.
26

PD-M423, PD-M403
(Release from test mode]
Here is the procedure for releasing the test mode:
1. Press the STOP key and stop all operations.
2. Unplug the power cord from the AC socket.
[Operations of the keys in test mode]
| Code | KeyName | Function In Test Mode Explanation
PGM Focus servo close The laser diode is lit up and the focus actuator is lifted
(PROGRAM) up, then lowered slowly and the focus servo is closed at
the point where the objective lens is focused on the disc.
With the player in this state, if you lightly rotate the
stopped disc by hand, you can hear the sound the focus
servo.
If you can hear this sound, the focus servo is operating
correctly. If you press this key with no disc mounted, the
laser diode lights up, the focus actuator is pulled up, then
the actuator is lowered and raised three times and
retuned to its original position.
[>] | PLAY/PAUSE | Spindle servo ON Starts the spindle motor in the clockwise direction and
when the disc rotation reaches the prescribed speed
(about 500 rpm at the inner periphery), sets the spindle
servo in a closed loop.
Be careful. Pressing this key when there is no disc
mounted makes the spindle motor run at the maximum
speed.
If the focus servo does not go correctly into a closed loop
or the laser light shines on the mirror section at the
outermost periphery of the disc, the same symptom is
occurred.
Tracking servo Pressing this key when the focus servo and spindle servo
close/open are operating correctly in closed loops puts the tracking
servo into a closed loop, displays the track number being
played back and the elapsed time on the front panel, and
outputs the playback signal.
If the elapsed time is not displayed or not counted
correctly or the audio is not played back correctly, it may
be that the laser is shining on the section with no sound
recorded at the outer edge of the disc, that something is
out of adjustment, or that there is some other problem.
This key is a toggle key and open/close the tracking
servo alternately. This key has no effect if no disc is
mounted.
27

PD-M423, PD-M403
Function in Test Mode Explanation
KKI | TRACK / Carriage reverse Moves the pickup position toward the inner diameter of
. MANUAL (inwards) the disc. When this key is pressed with the tracking
SEARCH servo in a closed loop, the tracking servo automatically
REV goes into an open loop. Since the motor does not auto-
matically stop at the mechanical end point in test mode,
be careful with this operation.
Carriage forward Moves the pickup position toward the outer diameter of
(outwards) the disc. When this key is pressed with the tracking
servo in a closed loop, the tracking servo automatically
goes into an open loop. Since the motor does not auto-
matically stop at the mechanical end point in test mode,
be careful with this operation.
Initializes and the disc rotation stops.
The pickup and disc remain where they are when this key
is pressed.
CD magazine eject Stores Disc 1 in the CD magazine, then ejects the CD
magazine. However, even though the CD magazine is
ejected, the pickup does not return to the park position.
Even if the CD magazine is mounted again, the pickup
remains where it is.
Note : When inserting the magazine, disc | of the magazine is loaded automatically.
(How to play back a disc in test mode]
In test mode, since the servos operate independently, playing back a disc requires that you operate the keys in the
correct order to close the servos.
Here is the key operation sequence for playing back a disc in test mode.
PGM(PROGRAM) Lights up the laser diode and closes the focus servo.
g
>/ Starts the spindle motor and closes the spindle servo.
4
>/ 00 Closes the tracking servo.
Wait at least 2-3 seconds between each of these operations.
28

PD-M423, PD-M403
1. Focus Offset Verification
@ Objective Verify the DC offset for the focus error amp.
@ Symptom when out of | The model does not focus in and the RF signal is dirty.
adjustment
@ Measurement instru- | Connect the oscilloscope to @ Player state Test mode, stopped
ment connections TPI, Pin 6(FCS. ERR) (just the Power switch on)
[Settings]
5mV/division
@
Adjustment
location
|
None
10 ms/division
DC
mode
@
Disc
None
needed
[Procedure]
Verify the DC voltage at TP1, Pin 6 (FCS. ERR) is 0 + 50 mV.
Note : If the specified values cannot be obtained or no adjustment is possible by performing the
verifications or adjustments described in adjustment items 1 — 4, the pickup block may be defective.
2. Tracking Error Balance Verification
@ Objective To verify that there is no variation in the sensitivity of the tracking photo diode.
@ Symptom when out of | Play does not start or track search is impossible.
adjustment
@ Measurement instru- | Connect the oscilloscope to @ Player state Test mode, focus and spindle servos
ment connections TP1, Pin 2(TRK. ERR). This closed and tracking servo open
connection may be via a low
pass filter.
@ Adjustment location | None
[Settings] 50 mV/division
5 ms/division
DC mode
[Procedure]
. Move the pickup to midway across the disc (R=35 mm) with the TRACK /MANUAL SEARCH FWD PtP. pp] or
REV KK. <klkey.
. Press the PGM (PROGRAM) key, then the PLAY/PAUSE [>/ []] key in that order to close the focus servo then the
spindle servo.
. Line up the bright line (ground) at the center of the oscilloscope screen and put the oscilloscope into DC mode.
. Supposing that the positive amplitude of the tracking error signal at TP1, pin 2 (TRK ERR) is (A) and the negative
amplitude is (B), the following expression is satisfied.
When A2ZB,
When A<B,
When there is a DC When there is no DC
component component
29

PD-M423, PD-M403
3. Pickup Radial/Tangential Tilt Adjustment
To
adjust
the
angle
of
the
pickup
relative
to
the
disc
so
that
the
laser
beams
are
shone
straight
down
into
the
disc
for
the
best
read
out
of
the
RF
signals.
@ Objective
e@ Symptom when out of {Sound broken;some discs can be played but not others.
adjustment
Connect the oscilloscope to
TPI, Pin | (RF).
@ Measurement instru- Test mode, play
ment connections
@ Player state.
Pickup radial tilt adjustment screw
and tangential tilt adjustment screw
; ae @ Adjustment location
[Settings] _20mV/division
200 ns/division
YEDS-7
[Procedure]
.
Press
the
TRACK
/
MANUAL
SEARCH
FWD
D>
-
bDllor
REVIKK
-
<kt
key
to
move
the
pickup
to
halfway
across
the
disc
(R=35mm).
Press
the PGM(PROGRAM)
key,
the PLAY/PAUSE
[>
/
[]]
key
twice
in
that
order
to
close
the respective
servos
and
put
the
player
into play
mode.
. First, adjust the radial tilt adjustment screw with a Phillips screwdriver so that the eye pattern (the diamond shape at
the center of the RF signal) can be seen the most clearly.
. Next, adjust the tangential tilt adjustment screw with a Phillips screwdriver so that the eye pattern (the diamond shape
at the center of the RF signal) can be seen the most clearly (Figure 3).
4. Adjust the radial tilt adjustment screw and the tangential tilt adjustment screw again so that the eye pattern can be
seen the most clearly. As necessary, adjust the two screws alternately so that the eye pattern can be seen the most
clearly.
5. When the adjustment is completed, lock the radial and tangential adjustment screw.
Note:Radial and tangential mean the directions relative to the disc shown in Figure 2.
NR
w
Phillips
screwdriver
Tangential
direction
Radial direction
Tangential direction
2,
27 ©) 3
Disc
Figure 2
Radial direction
Adjustment locations
30