ORDER NO.
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
PIONEER ELECTRONIC CORPORATION 1998
RRV2054
CONTENTS
T ZZK NOV. 1998 Printed in Japan
1. SAFETY INFORMATION ...................................... 2
2. EXPLODED VIEWS AND PARTS LIST ................ 3
3. SCHEMATIC DIAGRAM ..................................... 14
4. PCB CONNECTION DIAGRAM .......................... 31
5. PCB PARTS LIST ............................................... 44
6. ADJUSTMENT .................................................... 49
7. GENERAL INFORMATION ............................... 55
7.1 PARTS ......................................................... 55
7.1.1 IC ......................................................... 55
7.1.2 DISPLAY .............................................. 61
7.2 DISASSEMBLY ........................................... 63
7.3 BLOCK DIAGRAM ....................................... 66
8. PANEL FACILITIES AND SPECIFICATIONS .... 68
STEREO CD CASSETTE DECK RECEIVER
XR-A770
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
Type
Model
Power Requirement
Remarks
XR-A770
MYXJ
AC220-230V
NVXJ
AC230V
2
XR-A770
Printed on the Rear Panel
NVXJ Type
MYXJ Type
MYXJ Type
LABEL CHECK
Additional Laser Caution
1. Laser Interlock Mechanism
The position of the switch (S8501) for detecting loading
state is detected by the system microprocessor, and
the design prevents laser diode oscillation when the
switch (S8501) is pressed physically.
Thus, the interlock will no longer function if the switch (S8501)
is released physically and deliberatery.
The interlock also does not function in the test mode
.
Laser diode oscillation will continue, if pin 62 of
LA9240ML (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 54.
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.
IMPORTANT
THIS PIONEER APPARATUS CONTAINS
LASER OF CLASS 1.
SERVICING OPERATION OF THE APPARATUS
SHOULD BE DONE BY A SPECIALLY
INSTRUCTED PERSON.
LASER DIODE CHARACTERISTICS
MAXIMUM OUTPUT POWER: 1.3 mW
WAVELENGTH: 790 nm
± 25 nm
3
XR-A770
VOL
KA
RA
OK
E
SF
C
DISC
DISC
DISC
CLEAR
STATIO
N
REMOTE
CONTROL
UNIT
CU-XR025
MONO
BAND
PGM
RE
PE
AT
RA
ND
O
M
AU
X
P.B
AS
S
DIS
PL
AY
SL
EE
P
POWER
6
1
3
7
9(1/2)
8(1/2)
8(2/2)
9(2/2)
10
2
13
14
11
15
4
5
18
19
16
MYXJ Type Only
MYXJ
Type Only
MYXJ
Type Only
MYXJ
Type Only
NVXJ Type Only
17
13
9
12
2.1 PACKING
1
FM Antenna
ADH7005
2
Operating Instructions
XRE3014
(English/French)
3
AM Loop Antenna
XTB3001
4
Remote Control Unit
XZN3007
(CU-XR049)
5
Battery Cover
AZA7204
NSP
6
Dry Cell Battery (R6P, AA)
VEM-013
7
Polyethylene Bag
Z21-038
(0.03
× 230 × 340)
8
Front Pad
See Contrast table (2)
9
Rear Pad
See Contrast table (2)
(1) PACKING PARTS LIST
Mark No.
Description
Part No.
2. EXPLODED VIEWS AND PARTS LIST
NOTES:
· Parts marked by "NSP" and
can not be supplied.
· 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.
10
Packing Case
See Contrast table (2)
11
Packing Sheet
AHG7049
12
Fuse (T5A)
See Contrast table (2)
13
Power Cord
See Contrast table (2)
NSP
14
Polyethylene Bag
See Contrast table (2)
15
Operating Instructions
XRE3016
(English/French/German/Italian/Dutch/
Swedish/Spanish/Portuguese/Chinese)
NSP
16
Door Spacer
XHG3002
NSP
17
Warranty Card
ARY7022
18
Operating Instructions
See Contrast table (2)
19
Operating Instructions
See Contrast table (2)
Mark No.
Description
Part No.
(2) CONTRAST TABLE
XR-A770/MYXJ and NVXJ are constructed the same except for the following :
Mark No.
Symbol and Description
Part No.
Remarks
XR-A770
XR-A770
/MYXJ
/NVXJ
8
Front Pad
XHA3005
XHA3009
9
Rear Pad
XHA3006
XHA3010
10
Packing Case
XHD3050
XHD3070
12
Fuse (T5A)
Not used
AEK1016
13
Power Cord
ADG1154
ADG1156
NSP
14
Polyethylene Bag
AHG7033
Not used
18
Operating Instructions (Italian/German/Dutch)
XRC3003
Not used
19
Operating Instructions
XRC3004
Not used
(Portuguese/Swedish/Spanish)
4
XR-A770
2.2 EXTERIOR (1/2)
2
12
12
Note :
Attatch on the same numbers
× three.
Refer to
"2.5 $M MECHANISM CD".
Note :
Hook Tray cap on top of loading tray and then
insert the bottom three hooks.
9
9
11
15
11
15
11
1
6
10
4
5
7
14
13
3
3
9
8
17
16
18
18
5
XR-A770
· EXTERIOR (1/2) PARTS LIST
Mark No.
Description
Part No.
1
22P F.F.C/30V
XDD3018
NSP
2
$M Mechanism CD
XXA3006
3
Volume Knob
XAA3005
4
FL Cover A
XAK3026
5
FL Cover B
XAK3036
6
Tray Cap
XZN3047
7
Display Panel
XAK3049
8
Bonnet Case
XZN3040
9
Screw
BPZ30P100FZK
10
Pioneer Badge
XZN3049
11
Screw
VBT30P080FZK
12
Disc Label
XAX3127
13
Jog Knob Assy
XXG3023
14
Bass Knob
XAB3005
15
Screw
BCZ30P080FZK
NSP
16
Cord Stopper
DNF1128
17
Push Rivet
AEC7138
18
Cushion Rubber
XEB3002