SERVICE MANUAL
MDX-C8900
SUPPLEMENT-1
File this supplement with the service manual.
US Model
E Model
Subject: Main board Modification
(ECN-CSB00088)
[MAIN BOARD] (COMPONENT SIDE)
Former:
1-670-310-11
New:
1-670-310-12, -13
1. DISCRIMINATION
2
2-1.
NOTES FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
Note on Schematic Diagram:
· All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
· All resistors are in
and 1/4 W or less unless otherwise
specified.
·
¢
: internal component.
· C : panel designation.
· U : B+ Line.
· Power voltage is dc 14.4V and fed with regulated dc power
supply from ACC and BATT cords.
· Voltages are taken with a VOM (Input impedance 10 M
).
Voltage variations may be noted due to normal produc-
tion tolerances.
· Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
() : AM
: MD PLAY
· Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
· Circled numbers refer to waveforms.
· Signal path.
F
: FM
f
: AM
E
: MD
Note on Printed Wiring Boards:
· X : parts extracted from the component side.
· Y : parts extracted from the conductor side.
· b : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side:
Parts on the pattern face side seen from
(Conductor Side)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Component Side)
the parts face are indicated.
2. DIAGRAMS
MDX-C8900
3
4
2-2.
PRINTED WIRING BOARD MAIN Board (Component Side)
IC401
E-7
IC403
I-10
IC404
G-10
IC411
H-6
IC500
I-8
IC503
J-9
IC504
C-3
IC505
K-2
Q1
E-12
Q9
H-11
Q10
G-11
Q12
H-11
Q13
G-14
Q14
I-14
Q102
G-5
Q103
F-5
Q202
G-9
Q203
H-9
Q206
H-10
Q207
H-10
Q306
J-10
Q307
J-9
Q401
G-9
Q402
C-6
Q403
D-7
Q404
C-7
Q405
C-7
Q406
D-6
Q501
K-6
Q502
K-5
Q503
J-5
Q504
J-4
Q505
K-5
Q506
K-4
Q507
K-4
Q509
C-4
Q510
H-1
Q512
F-3
Q513
G-3
Q514
F-3
Q515
C-6
Q516
C-6
Q517
C-5
Q518
F-2
Q519
E-3
Q520
B-3
Q522
B-3
Q523
K-10
Ref. No.
Location
Ref. No.
Location
D6
G-12
D31
D-11
D100
F-5
D101
E-5
D401
D-7
D407
G-6
D501
A-3
D502
I-7
D503
K-11
D507
F-4
D509
C-6
D510
K-12
D511
J-12
D512
K-12
D513
K-12
D514
K-12
D515
K-11
D516
K-11
D517
K-11
D518
K-11
D519
K-11
D522
B-5
D523
B-5
D524
D-6
D525
B-5
D526
B-5
D535
B-3
D536
B-3
D537
B-2
D538
B-3
D541
B-4
D542
B-4
D543
J-13
D546
H-1
D601
B-7
D602
B-7
D603
B-7
D604
B-6
D605
B-7
D606
B-8
D607
B-8
D608
B-8
IC4
E-12
IC100
H-7
IC101
E-5
IC200
F-9
IC300
C-9
IC400
F-7
· Semiconductor Location
(Component Side)
See page 50 on
service manual.
(
)
5
6
MDX-C8900
2-3.
PRINTED WIRING BOARD MAIN Board (Conductor Side)
Ref. No.
Location
D5
C-11
D7
H-11
D402
G-10
D403
G-10
D406
G-9
D500
I-7
D504
K-5
D505
B-1
D506
K-4
D508
F-3
D520
B-1
D521
A-1
D527
H-4
D528
F-4
D529
H-4
D530
K-10
D531
B-4
D533
B-4
D534
E-3
D539
C-3
D540
B-4
D544
H-3
D545
H-3
D701
J-11
IC402
E-7
IC405
D-7
IC409
F-7
IC501
G-2
IC502
H-5
IC506
F-1
IC600
A-7
Q2
C-11
Q3
D-11
Q5
H-14
Q6
D-12
Q100
F-4
Q101
F-4
Q200
E-9
Q201
E-10
Q300
C-9
Q301
C-9
Q400
G-8
Q508
J-4
Q511
F-2
Q521
D-3
Q524
G-4
Q525
G-4
Q526
J-5
Q527
H-3
· Semiconductor
Location
(Conductor Side)
See page 37 on
service manual.
(
)
See page 64 on
service manual.
(
)
2-4.
SCHEMATIC DIAGRAM MAIN Section (1/3)
7
8
MDX-C8900
See
page
44
on
ser
vice
manual.
(
)
(Page 9)