Pioneer CDX-P1250 User manual

PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan
PIONEER ELECTRONICS SERVICE INC. P.O.Box 1760, Long Beach, CA 90801-1760 U.S.A.
PIONEER ELECTRONIC [EUROPE] N.V. Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE.LTD. 253 Alexandra Road, #04-01, Singapore 159936
C PIONEER ELECTRONIC CORPORATION 1999 K-ZZY. FEB. 1999 Printed in Japan
ORDER NO.
CRT2318
MULTI-COMPACT DISC PLAYER
CDX-P1250 X1N/UC
Service
Manual
CONTENTS
1. SAFETY INFORMATION ............................................3
2. EXPLODED VIEWS AND PARTS LIST.......................4
3. SCHEMATIC DIAGRAM ...........................................12
4. PCB CONNECTION DIAGRAM ................................20
5. ELECTRICAL PARTS LIST ........................................26
6. ADJUSTMENT..........................................................29
7. GENERAL INFORMATION .......................................35
7.1 IC .........................................................................35
7.2 DIAGNOSIS ........................................................40
7.2.1 DISASSEMBLY .........................................40
7.2.2 TEST MODE..............................................42
7.3 BLOCK DIAGRAM ..............................................48
8. OPERATIONS AND SPECIFICATIONS.....................50
-See the separate manual CX-938(CRT2357) for the CD mechanism description, disassembly and circuit
description.
-The CD mechanism employed in this model is one of C8 series.
CDX-P1250/X1N/UC
CDX-P1250 X1N/EW
CDX-P1250 X1N/ES

2
CDX-P1250
-CD Player Service Precautions
1. For pickup unit(CXX1285) handling, please refer
to"Disassembly"(See page 40). During replacement,
handling precautions shall be taken to prevent an
electrostatic discharge(protection by a short pin).
2. During disassembly, be sure to turn the power off
since an internal IC might be destroyed when a con-
nector is plugged or unplugged.
3. Please checking the grating after changing the pickup
unit(see page 29) since these screws protects the
mechanism during transport, be sure to affix it when
it is transported for repair, etc.
Transport screw
Attach to the original position before transporting the set.
Seal
After removing the transport screw, cover the hole
with the supplied seal.
Transportation of multi-CD Player
A transport screw has been attached to the set in order to protect it
during transportation. After removing the transport screw, cover
the hole with the supplied seal. Be sure to remove the transport
screw before mounting the set. The removed transport screw
should be retained in the accessory bag for use the next time the
set is transported.

3
CDX-P1250
1. SAFETY INFORMATION
1.1 CDX-P1250/X1N/UC
CAUTION
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
This product contains lead in solder and certain electrical parts contain chemicals which are known to the state of
California to cause cancer, birth defects or other reproductive harm.
Health & Safety Code Section 25249.6 - Proposition 65
1.2 CDX-P1250/X1N/EW
1. Safety Precautions for those who Service this Unit.
• Follow the adjustment steps (see pages 29 through 34)in the service manual when servicing this unit. When check-
ing or adjusting the emitting power of the laser diode exercise caution in order to get safe, reliable results.
Caution:
1. During repair or tests, minimum distance of 13cm from the focus lens must be kept.
2. During repair or tests, do not view laser beam for 10 seconds or longer.
2. A “CLASS 1 LASER PRODUCT” label is affixed to the
rear of the player. 3. The triangular label is attached to the mechanism
unit frame.
4. Specifications of Laser Diode
Specifications of laser radiation fields to which human access is possible during service.
Wavelength = 800 nanometers

4
CDX-P1250
2. EXPLODED VIEWS AND PARTS LIST
2.1 PACKING
12
11
11
12
8
9
15
19
10
7
13
5
4
3
1
6
2
14
21
20
16

5
CDX-P1250
Part No.
Mark No. Description CDX-P1250/X1N/UC CDX-P1250/X1N/EW CDX-P1250/X1N/ES
1 Screw Assy CEA1962 CEA1962 CEA1962
2 Screw CBA1295 CBA1295 CBA1295
* 3 Polyethylene Sheet CNM5158 CNM5158 CNM5158
4 Screw HMB60P500FMC HMB60P500FMC HMB60P500FMC
5 Screw HMF40P080FZK HMF40P080FZK HMF40P080FZK
6 Nut NF60FMC NF60FMC NF60FMC
* 7 Polyethylene Bag CEG1099 CEG1099 CEG1099
8 Polyethylene Bag CEG1174 CEG1026 CEG1026
9 Carton CHG3717 CHG3718 CHG3719
10 Contain Box CHL3717 CHL3718 CHL3719
11 Protector CHP2136 CHP2136 CHP2136
12 Protector CHP2137 CHP2137 CHP2137
13 Seal CNM5599 CNM5741 CNM5741
14-1 Owner’s Manual CRD2895 CRD2896 CRD2898
14-2 Owner’s Manual Not used CRD2897 CRB1533
* 14-3 Warranty Card Not used CRY1087 Not used
* 14-4 Caution Card CRP1201 CRP1203 CRP1202
* 14-5 Caution Card CRP1205 CRP1205 CRP1205
15 Magazine Assy CXB4028 CXB4028 CXB4028
16 Angle Assy CXB3589 CXB3590 CXB3590
17 •••••
18 •••••
19 Cord CDE5831 CDE5830 CDE5831
* 20 Caution Card CRP1090 CRP1090 CRP1090
* 21 Caution Card CRP1196 CRP1196 CRP1196
- Owner’s Manual
Model Part No. Language
CDX-P1250/X1N/UC CRD2895 English, French
CDX-P1250/X1N/EW CRD2896 English, Italian, French
CRD2897 German, Dutch, Spanish
CDX-P1250/X1N/ES CRD2898 English, Spanish, Portuguese(B), Arabic
CRB1533 Chinese
-PACKING SECTION PARTS LIST
NOTE:
-Parts marked by “*”are generally unavailable because they are not in our Master Spare Parts List.
-Screws adjacent to ∇mark on the product are used for disassembly.

6
CDX-P1250
2.2 EXTERIOR

7
CDX-P1250
1 Screw BMZ26P040FMC
2 Screw BMZ30P040FZK
3 Button CAC4632
4 Screw CBA1353
5 Spring CBH1862
6 Connector CDE5525
7 Connector CDE5783
8 Cord See Contrast table(2)
9 •••••
10 •••••
11 Upper Case See Contrast table(2)
12 Arm CNC8058
13 Insulator CNM6074
14 Panel CNS5218
15 Damper CNV5227
16 Power Unit CWX2300
17 Screw BMZ26P060FMC
18 Plug(CN901) CKS-460
19 Connector(CN921) CKS3407
20 Connector(CN911) CKS4072
21 Holder CNC8059
22 Holder CNC8060
23 Lower Case Unit See Contrast table(2)
24 Grille Unit See Contrast table(2)
25 Screw BPZ20P080FMC
26 Door See Contrast table(2)
27 Door See Contrast table(2)
28 Holder CNC8141
29 Lever See Contrast table(2)
30 Grille See Contrast table(2)
31 Screw HMF40P080FZK
32 Angle Assy See Contrast table(2)
33 CD Mechanism Module See Contrast table(2)
34 Screw IMS20P035FZK
35 Screw IMS26P040FMC
36 Sheet See Contrast table(2)
37 Transistor(Q910) 2SD2396
38 Seal See Contrast table(2)
39 Caution Card CRP1196
(1) EXTERIOR SECTION PARTS LIST
Mark No. Description Part No. Mark No. Description Part No.
Part No.
Mark No. Symbol and Description CDX-P1250/X1N/UC CDX-P1250/X1N/EW CDX-P1250/X1N/ES
8 Cord CDE5831 CDE5830 CDE5831
11 Upper Case CNB2449 CNB2390 CNB2390
23 Lower Case Unit CXB3398 CXB3397 CXB3397
24 Grille Unit CXB4385 CXB4386 CXB4387
26 Door CAT2023 CAT2008 CAT2008
27 Door CAT2024 CAT2009 CAT2009
29 Lever CNS5393 CNS5357 CNS5357
30 Grille CNS5294 CNS5293 CNS5295
32 Angle Assy CXB3589 CXB3590 CXB3590
33 CD Mechanism Module CXK4900 CXK4905 CXK4900
36 Sheet CAH1683 CAH1681 CAH1681
38 Seal CNM5599 CNM5741 CNM5741
(2) CONTRAST TABLE
CDX-P1250/X1N/UC, CDX-P1250/X1N/EW and CDX-P1250/X1N/ES are constructed the same except for
the following:

8
CDX-P1250
2.3 CD MECHANISM MODULE

9
CDX-P1250
1 Connector CDE6069
2 CD Core Unit(C8) See Contrast table(2)
3 Connector(CN701) CKS1953
4 Connector(CN101) CKS2272
5 Screw BMZ20P025FMC
6 Screw CBA1037
7 Screw CBA1041
8 Screw CBA1176
9 Screw CBA1362
10 Screw CBA1387
11 Screw CBA1470
12 Screw CBA1476
13 Screw CBA1486
14 Washer CBF1038
15 Spring CBH1867
16 Spring CBH2172
17 Spring CBH2173
18 Spring CBH2174
19 Spring CBH2175
20 Spring CBH2177
21 Spring CBH2178
22 Spring CBH2179
23 Spring CBL1390
24 Spring CBL1392
25 Spring CBL1404
26 Short Pin CBL1239
27 Volume(VR801) CCW1024
28 •••••
29 Shaft CLA3304
30 Arm CNC7901
31 Lever CNC7905
32 Lever CNC7906
33 Arm CNC7908
34 Arm CNC7909
35 Holder CNC7911
36 Holder CNC7912
37 Lever CNC7919
38 Stopper CNC7920
39 Frame CNC7921
40 Lever CNC7922
41 Bracket CNC7923
42 Lever CNC7924
43 Frame CNC7927
44 Frame CNC7928
45 Bracket CNC8355
46 Plate CNC8375
47 Cover CNC8434
48 Sheet CNM6009
49 Spacer CNM6146
50 Sheet CNM6296
51 PCB CNP5227
52 PCB CNP5228
53 Ball CNR1189
54 Gear CNR1531
55 Belt CNT1086
56 Gear CNV5472
57 Gear CNV5473
58 Rail CNV5474
59 Lever CNV5475
60 Gear CNV5477
61 Arm CNV5478
62 Holder CNV5480
63 Guide CNV5481
64 Guide CNV5482
65 Holder CNV5483
66 Holder CNV5484
67 Clamper CNV5485
68 Gear CNV5486
69 Gear CNV5562
70 Holder CNV5563
71 Stopper CNV5564
72 Lighting Conductor CNV5785
73 Mechanism PCB CWX2303
74 Connector(CN801) CKS1965
75 Connector(CN802) CKS3486
76 Damper Unit CXA7159
77 Chassis Unit CXB2850
78 •••••
79 Chassis Unit CXB2851
80 Arm Unit CXB2855
81 Screw Unit CXB2857
82 •••••
83 Frame Unit CXB4427
84 Magazine Holder Unit CXB2859
85 Motor Unit(M851)(SPINDLE) CXB3003
86 Motor Unit(M854)(CARRIAGE) CXB3004
87 Screw JFZ20P025FMC
88 Motor Unit(M853)(TRAY) CXB4421
89 Screw JFZ20P025FMC
90 Motor Unit(M852)(ELV) CXB3006
Mark No. Description Part No. Mark No. Description Part No.
(1)CD MECHANISM MODULE SECTION PARTS LIST

10
CDX-P1250
91 Screw JFZ20P025FMC
92 Lever Unit CXB3938
93 •••••
94 Gear Unit CXB4338
95 Screw JGZ17P025FZK
96 Pickup Unit(Service) CXX1285
97 •••••
98 •••••
99 Screw IMS26P040FMC
100 Screw JFZ20P025FNI
101 Photo-transistor(Q851) PT4800
102 Spring Switch(S851,S853) CSN1051
103 LED(D851) CN504-2
104 Spring Switch(S852) CSN1052
Mark No. Description Part No.
(2) CONTRAST TABLE
CDX-P1250/X1N/UC, CDX-P1250/X1N/EW and CDX-P1250/X1N/ES are constructed the same except for
the following:
Part No.
Mark No. Symbol and Description CDX-P1250/X1N/UC CDX-P1250/X1N/EW CDX-P1250/X1N/ES
2 CD Core Unit(C8) CWX2262 CWX2263 CWX2262

11
CDX-P1250
2.4 MAGAZINE ASSY
1 Magazine Assy CXB4028
2 Tray CNV5341
3 Label CRW1396
-MAGAZINE ASSY SECTION PARTS LIST
Mark No. Description Part No.

12
CDX-P1250
1234
1234
D
C
B
A
3. SCHEMATIC DIAGRAM
3.1 OVERALL CONNECTION DIAGRAM
Note: When ordering service parts, be sure to refer to “EXPLODED VIEWS AND PARTS LIST” or “ELECTRICAL
PARTS LIST”.
M853
CXB3005
M852
CXB3006
M851
CXB3003
M854
CXB3004
PICKUP UNIT(SERVICE)
CXX1285
CSN1051
CSN1051
CSN1052
CN504-2
PT4800
10k
680(B)
C
MECHANISM
PCB
D
SWITCH PCB
E
MOTOR PCB
MOT
4CH SERVO DRIV
RF-A
DSP
112
68
13
21
1
4
CN801
CN802
C
D
E
A
1/2

13
CDX-P1250
5678
5678
D
C
B
A
ACD CORE UNIT
A2/2
MOTOR DRIVER
DRIVER
RF-AMP,SERVO,
DSP,DAC
18
7
2
5
19 20
15
17
16
12
3
9
11
10
EWmodel
UC,ES model
A
1/2

14
CDX-P1250
1234
1234
D
C
B
A
A
2/2
A1/2
SYSTEM CONTROLLER
EWmodel
UC,ESmodel

15
CDX-P1250
5678
5678
D
C
B
A
A
2/2
GGC1257
(SRM2B256SLTMX70)
B
CN911
LER SRAM
IP-BUS DRIVER
POWER UNIT
EWmodel
UC,ESmodel

16
CDX-P1250
1RFI 0.5V/div. 0.5µs/div.
Normal mode: play
1CH1: RFI 1V/div.
2CH2: MIRR 5V/div.
Test mode: Tracking open
0.5ms/div. 1CH1: RFI 1V/div.
2CH2: MIRR 5V/div.
Normal mode: The defect part
passes 800µm
0.5ms/div.
3CH1: FD 0.5V/div.
4CH2: FOR 2V/div.
Test mode: No disc, Focus close
0.2s/div. 3CH1: FD 0.5V/div.
5CH2: FOK 2V/div.
Normal mode: Focus close
0.2s/div. 6CH1: FE 0.5V/div.
7CH2: XSI 2V/div.
Normal mode: Focus close
1ms/div.
REFO →
8CH1: TE 0.5V/div.
9CH2: TD 0.5V/div.
Test mode: 32 tracks jump (REV)
0.5ms/div. 8CH1: TE 0.5V/div.
9CH2: TD 0.5V/div.
Test mode: Single jump (REV)
0.5ms/div. 8CH1: TE 0.5V/div.
9CH2: TD 0.5V/div.
Test mode: 100 tracks jump (REV)
5ms/div.
6CH1: FE 0.1V/div.
3CH2: FD 0.2V/div.
Normal mode: Play
20ms/div. 3CH1: FD 0.5V/div.
0CH2: MD 1V/div.
Normal mode: Focus close (12cm)
0.5s/div. 3CH1: FD 0.5V/div.
0CH2: MD 1V/div.
Normal mode: Focus close (8cm)
0.5s/div.
REFO →
REFO →
REFO →
REFO →
REFO →
REFO →
GND →
REFO →
REFO →
REFO →
REFO →
REFO →
REFO →
REFO →
REFO →
REFO →
REFO →
REFO →
REFO →
-Waveforms
Note:1. The encircled numbers denote measuring pointes in the circuit diagram.
2. Reference voltage
REFO:2.5V
REFO →
REFO →
REFO →
REFO →

17
CDX-P1250
8CH1: TE 0.2V/div.
9CH2: TD 0.2V/div.
Normal mode: play
8CH1: TE 0.5V/div.
!CH2: SD 0.5V/div.
TEST mode:100Tracks jump(FWD)
5ms/div. 0MD 0.5V/div. 0.1s/div.
Normal mode: Play (12cm)
0MD 1V/div. 10ms/div.
Long Search (12cm)
@EFM 1V/div. 5µs/div.
Normal mode: Play
8CH1: TE 1V/div.
#CH2: TEC 1V/div.
Test mode: Focus close
Tracking open
2ms/div.
8CH1: TE 0.5V/div.
6CH2: FE 0.5V/div.
Normal mode:
AGC after focus close
0.2s/div.
20ms/div.
%SCKO 2V/div. 1µs/div.
Normal mode: Play
^DOUT 2V/div. 10µs/div.
Normal mode: Play
&LRCK 2V/div. 20µs/div.
Normal mode: Play
*VD 5V/div. 50ms/div.
Normal mode: No disc
GND →
REFO →
REFO →
GND →
REFO →
REFO →
REFO →
REFO →REFO →
REFO →
REFO →
REFO →
REFO →
GND →
REFO →
GND →
REFO →
GND →
REFO →

18
CDX-P1250
(CH1: R OUT 2V/div.
)CH2: L OUT 2V/div.
Normal mode: Play (1kHz 0dB)
6CH1: FE 0.2V/div.
3CH2: FD 0.5V/div.
Normal mode: During AGC
1ms/div. 8CH1: TE 0.2V/div.
9CH2: TD 0.5V/div.
Normal mode: During AGC
1CH1: RFI 1V/div.
⁄CH2: HOLD 5V/div.
Normal mode: The defect part passes
800µm(B.D)
500µs/div. 1ms/div.
0.5ms/div. 3CH1: FD 1V/div.
⁄CH2: HOLD 5V/div.
Normal mode: The defect part passes
800µm(B.D)
0.5ms/div. 9CH1: TD 0.1V/div.
⁄CH2: HOLD 5V/div.
Normal mode: The defect part passes
800µm(B.D)
0.5ms/div.
REFO →
REFO →
REFO →
REFO →
REFO →
REFO →
REFO →
REFO →REFO →
REFO →
REFO →
REFO →

19
CDX-P1250
1234
1234
D
C
B
A
B
3.2 POWER UNIT
470/16
470/16
1SR139-400
CTH1047 1mH
1SR139-400
220000/5R5
HZS6L(B1)
MUTE
8V REG.
CEK1018
Yellow
B
A

4. PCB CONNECTION DIAGRAM
4.1 CD CORE UNIT
M
M852
ELV
E
F
RERO
EREF
EPVO
20
CDX-P1250
1234
1234
D
C
B
A
A
SIDE A
CD CORE UNIT
A
NOTE FOR PCB DIAGRAMS
1. The parts mounted on this PCB
include all necessary parts for
several destination.
For further information for
respective destinations, be sure
to check with the schematic dia-
gram.
CN911
B
C
CN801