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ORDER NO.
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 ELECTRONIC (EUROPE) N.V. Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936
PIONEER CORPORATION 1999
c
XR-A670
RRV2188
T ­ IZK SEPT. 1999 Printed in Japan
XR-A370
Type
Model
Power Requirement
XR-A670
XR-A370
MYXJ
AC220-230V
NVXJ
AC230V
KUCXJ
AC120V
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
STEREO CD CASSETTE DECK RECEIVER
SO
UN
D M
ORPHING
JO
G
· XR-A670
Remarks
1. SAFETY INFORMATION ....................................... 2
2. EXPLODED VIEWS AND PARTS LIST ................. 4
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM .. 14
4. PCB CONNECTION DIAGRAM ........................... 32
5. PCB PARTS LIST ................................................ 47
6. ADJUSTMENT ..................................................... 57
CONTENTS
7. GENERAL INFORMATION .................................. 67
7.1 DIAGNOSIS ................................................... 67
7.1.1 DISASSEMBLY ........................................ 67
7.2 PARTS ........................................................... 70
7.2.1 IC ............................................................. 70
7.2.2 DISPLAY .................................................. 72
8. PANEL FACILITIES AND SPECIFICATIONS ....... 74


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2
XR-A670, XR-A370
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
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
NOTICE
(FOR CANADIAN MODEL ONLY)
Fuse symbols
(fast operating fuse) and/or
(slow operating fuse) on PCB indicate that replacement parts must
be of identical designation.
REMARQUE
(POUR MODÈLE CANADIEN SEULEMENT)
Les symboles de fusible
(fusible de type rapide) et/ou
(fusible de type lent) sur CCI indiquent que les pièces
de remplacement doivent avoir la même désignation.
ANY MEASUREMENTS NOT WITHIN THE LIMITS
OUTLINED ABOVE ARE INDICATIVE OF A POTENTIAL
SHOCK HAZARD AND MUST BE CORRECTED BEFORE
RETURNING THE APPLIANCE TO THE CUSTOMER.
2. PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in the appliance
have special safety related characteristics. These are
often not evident from visual inspection nor the protection
afforded by them necessarily can be obtained by using
replacement components rated for voltage, 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
on the schematics and on the parts list
in this Service Manual.
The use of a substitute replacement component which does
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 PIONEER Service
Manual. A subscription to, or additional copies of, PIONEER
Service Manual may be obtained at a nominal charge from
PIONEER.
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 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, control
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.
(FOR USA MODEL ONLY)
Leakage
current
tester
Reading should
not be above
0.5mA
Device
under
test
Test all
exposed metal
surfaces
Also test with
plug reversed
(Using AC adapter
plug as required)
Earth
ground
AC Leakage Test


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3
XR-A670, XR-A370
Printed on the Rear Panel
MYXJ Type
MYXJ Type
NVXJ Type
LABEL CHECK (For MYXJ and NVXJ Types)
Additional Laser Caution
1. Laser Interlock Mechanism
The position of the switch (S9501) for detecting loading
state is detected by the system microprocessor, and
the design prevents laser diode oscillation when the
switch (S9501) is pressed physically.
Thus, the interlock will no longer function if the switch (S9501)
is released physically and deliberatery.
The interlock also does not function in the test mode
.
Laser diode oscillation will continue, if pin 1 of
CXA1821M (IC8101) on the CD ASSY mounted on the
$M Loading Mechanism assembly is connected to GND,
or else the terminals of Q8101 are shorted to each other
(fault condition).
2. When the cover is opened, close viewing of the objective
lens with the naked eye will cause exposure to a Class
1 laser beam.
: Refer to page 66.
LASER DIODE CHARACTERISTICS
MAXIMUM OUTPUT POWER: 5 mW
WAVELENGTH: 780 nm to 785 nm
IMPORTANT
THIS PIONEER APPARATUS CONTAINS
LASER OF CLASS 1.
SERVICING OPERATION OF THE APPARATUS
SHOULD BE DONE BY A SPECIALLY
INSTRUCTED PERSON.


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4
XR-A670, XR-A370
2.1 PACKING
2. EXPLODED VIEWS AND PARTS LIST
NOTES:
· Parts marked by "NSP" are generally unavailable because they are not in our Master Spare Parts List.
· 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.
· Screws adjacent to mark on the product are used for disassembly.
1
Power Cord
See Contrast table (2)
2
FM Antenna
See Contrast table (2)
3
AM Loop Antenna
XTB3001
4
Remote Control Unit
XZN3067
(CU-XR060)
5
Battery Cover
XZN3065
NSP
6
Dry Cell Battery (R6P, AA)
VEM-013
7
Packing Sheet
AHG7049
8
Front Pad
XHA3013
9
Rear Pad
XHA3014
10
Packing Case
See Contrast table (2)
NSP
11
Warranty Card
See Contrast table (2)
12
Polyethylene Bag
Z21-038
(0.03
× 230 × 340)
13
Operating Instructions
See Contrast table (2)
(English/French)
14
Operating Instructions
See Contrast table (2)
(Italian/Dutch/German)
15
Operating Instructions
See Contrast table (2)
(Portuguese/Swedish/Spanish)
16
Sub Pad
XHA3017
17
Fuse (T5A)
See Contrast table (2)
NSP
18
Polyethylene Bag
See Contrast table (2)
(1) PACKING PARTS LIST
Mark No.
Description
Part No.
VO
L
KA
RA
OK
E
SF
C
DIS
C
DIS
C
DIS
C
C
LE
AR
STATION
RE
M
OT
EC
ON
TR
OL
U
NIT
C
U-X
R0
25
M
O
N
O
BA
N
D
PG
M
RE
PE
AT
RA
ND
OM
AU
X
P.B
AS
S
DIS
PL
AY
SL
EE
P
POWER
2
3
12
16
17
8(1/2)
7
9(1/2)
18
1
1
13
11
14
XR-A670/MYXJ and
XR-A370/MYXJ Only
Except
NVXJ Type
NVXJ Type
Only
15
4
9(2/2)
10
8(2/2)
5
6
(2) CONTRAST TABLE
XR-A670/MYXJ, NVXJ, KUCXJ, XR-A370/MYXJ, NVXJ and KUCXJ are constructed the same except for the following :
Mark No.
Symbol and Description
Part No.
Remarks
XR-A670
/MYXJ
XR-A670
/NVXJ
XR-A670
/KUCXJ
XR-A370
/MYXJ
XR-A370
/NVXJ
XR-A370
/KUCXJ
NSP
NSP
1
2
10
11
13
14
15
17
18
Power Cord
FM Antenna
Packing Case
Warranty Card
Operating Instructions
(English/French)
Operating Instructions
(Italian/Dutch/German)
Operating Instructions
(Portuguese/Swedish/Spanish)
Fuse (T5A)
Polyethylene Bag
ADG1154
ADH7005
XHD3090
ARY7022
XRE3023
XRC3014
XRC3015
Not used
Not used
ADG1156
ADH7005
XHD3090
ARY7022
XRE3023
Not used
Not used
AEK7001
AHG7033
ADG7022
ADH7004
XHD3091
ARY7033
XRE3024
Not used
Not used
Not used
Not used
ADG1154
ADH7005
XHD3081
ARY7022
XRE3023
XRC3014
XRC3015
Not used
Not used
ADG1156
ADH7005
XHD3081
ARY7022
XRE3023
Not used
Not used
AEK7001
AHG7033
ADG7022
ADH7004
XHD3082
ARY7033
XRE3024
Not used
Not used
Not used
Not used


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5
XR-A670, XR-A370
B
C
D
A
A
B
C
D
E
E
F
F
Refer to
"2.3 FRONT PANEL SECTION".
Refer to
"2.4 $M MECHANISM CD-2".
6
30
30
30
21
2
7
4
51
50
50
51
51
54
54
8
25
53
28
26
31
20
46
14
18
17
16
15
3
11
35
5
1
48
48
48
49
55
55
37
38 or 44
55
55
55
55
49
49
48
49
41
40
42
45
KUCXJ
Type
Only
Except
NVXJ
Type
XR-A670
Only
KUCXJ Type
Only
Except
KUCXJ
Type
Except
KUCXJ Type
MYXJ
Type
Only
24
29
52
52
47
27
9
32
12
43
13
33
34
36
22
23
19
39
56
50
56
50
57
57
Note :
Attatch on the same numbers
× three.
Note :
Hook Tray cap on top of loading
tray and then insert the bottom
three hooks.
10
52
2.2 EXTERIOR SECTION