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PIONEER 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 EUROPE NV
Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE.LTD. 253 Alexandra Road, #04-01, Singapore 159936
C PIONEER CORPORATION 2000
K-ZZY. NOV. 2000 Printed in Japan
ORDER NO.
CRT2588
UNIVERSAL MULTI-CD SYSTEM
CDX-FM677
X1N/UC,ES
Service
Manual
CDX-FM673 X1N/UC
CDX-FM677/X1N/UC
- This service manual should be used together with the following manual(s):
Model No.
Order No.
Mech. Module
Remarks
CX-892
CRT2356
C7
CD Mech. Module:Circuit Description, Mech. Description, Disassembly
CONTENTS
1. SAFETY INFORMATION ............................................2
2. EXPLODED VIEWS AND PARTS LIST .......................3
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM ...12
4. PCB CONNECTION DIAGRAM ................................26
5. ELECTRICAL PARTS LIST ........................................34
6. ADJUSTMENT..........................................................38
7. GENERAL INFORMATION .......................................46
7.1 DIAGNOSIS ........................................................46
7.1.1 TEST MODE ..............................................46
7.1.2 DISASSEMBLY .........................................52
7.1.3 CONNECTOR FUNCTION DESCRIPTION54
7.2 PARTS .................................................................55
7.2.1 IC................................................................55
7.2.2 DISPLAY ....................................................59
7.3 OPERATIONAL FLOW CHART ...........................60
8. OPERATIONS AND SPECIFICATIONS.....................61


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2
CDX-FM677,FM673
1. SAFETY INFORMATION
- CDX-FM677/X1N/UC and CDX-FM673/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
A transport screw has been attached to the
set in order to protect it during transporta-
tion. 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.
Seal
After removing the trans-
port screw, cover the hole
with the supplied seal.
Transport screw
Attach to the original position before
transporting the set.
- CD Player Service Precautions
1. For pickup unit(CXX1285) handling, please refer
to"Disassembly"(see page 52).
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 ser-
vice pickup unit(see page 39).
4. Since these screws protects the mechanism during
transport, be sure to affix it when it is transported for
repair, etc.


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3
CDX-FM677,FM673
26
33
27
28
17
24
35
4
8
6
11
10
7
9
32
31
25
18
16
15
21
22
20
13
16
2
14
19
23
12
3
5
1
29
30
29
36
30
38
39
41
40
37
34
2. EXPLODED VIEWS AND PARTS LIST
2.1 PACKING


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4
CDX-FM677,FM673
Part No.
Mark No. Description
CDX-FM677/X1N/UC
CDX-FM673/X1N/UC
CDX-FM677/X1N/ES
1 Accessory Assy
CEA2767
CEA2770
CEA2768
2 Spring
CBH-865
CBH-865
CBH-865
3 Cord
CDE4289
CDE4289
CDE4289
4 Cord
CDE5812
CDE5812
CDE5812
5 Cord
CDE5814
CDE5814
CDE5814
6 Screw Assy
CEA1962
CEA1962
CEA1962
7 Screw
CBA1295
CBA1295
CBA1295
*
8 Polyethylene Sheet
CNM5158
CNM5158
CNM5158
9 Screw
HMB60P500FMC
HMB60P500FMC
HMB60P500FMC
10 Screw
HMF40P080FZK
HMF40P080FZK
HMF40P080FZK
11 Nut
NF60FMC
NF60FMC
NF60FMC
12 Screw Assy
CEA1965
CEA1965
CEA1965
*
13 Polyethylene Bag
CEG-127
CEG-127
CEG-127
14 Screw
IMS30P050FZK
IMS30P050FZK
IMS30P050FZK
15 Clamper
CEF1010
CEF1010
CEF1010
*
16 Polyethylene Bag
CEG-158
CEG-158
CEG-158
17 Polyethylene Bag
CEG1185
CEG1185
*CEG1263
18 Battery
CEX1065
Not used
CEX1065
19 Bracket
CNC8061
CNC8061
CNC8061
20 Cushion
CNM3182
CNM3182
CNM3182
21 Fastener(Soft)
CNM3872
CNM3872
CNM3872
22 Fastener(Rough)
CNM4041
CNM4041
CNM4041
23 Panel
CNS5428
CNS5428
CNS5428
*
24 Polyethylene Bag
CEG1099
CEG1099
CEG1099
25 Polyethylene Bag
CEG1185
CEG1185
CEG1042
26 Carton
CHG4283
CHG4281
CHG4282
27 Sub Carton
CHG4295
CHG4295
CHG4295
28 Contain Box
CHL4283
CHL4281
CHL4282
29 Protector
CHP2133
CHP2133
CHP2133
30 Protector
CHP2135
CHP2135
CHP2135
31 Seal
CNM5599
CNM5599
CNM5599
32-1 Installation Manual
CRD3324
CRD3322
CRD3326
32-2 Owner's Manual
CRD3323
CRD3321
CRD3325
* 32-3 Card
ARY1048
ARY1048
Not used
33 Antenna Select Assy
CWM7445
CWM7445
CWM7445
34 Display Assy
CXB6804
CXB6803
CXB6804
35 Remote Control Assy
CXB6798
Not used
CXB6798
36 Magazine Assy
CXB4027
CXB4027
CXB4027
37 Angle Assy
CXB3591
CXB3591
CXB3591
*
38 Caution Card
CRP1090
CRP1090
CRP1090
*
39 Caution Card
CRP1232
CRP1232
CRP1232
40 Air Cushioned Bag
CEG1055
CEG1055
CEG1055
41 Cover
CEG1062
CEG1062
CEG1062
- 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.


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5
CDX-FM677,FM673
- Owner's Manual
Model
Part No.
Language
CDX-FM677/X1N/UC
CRD3323
English, French
CDX-FM673/X1N/UC
CRD3321
English, French
CDX-FM677/X1N/ES
CRD3325
English, Spanish, Portuguese(B), Arabic
- Installation Manual
Model
Part No.
Language
CDX-FM677/X1N/UC
CRD3324
English, French
CDX-FM673/X1N/UC
CRD3322
English, French
CDX-FM677/X1N/ES
CRD3326
English, Spanish, Portuguese(B), Arabic