Sony CDX-C7850 (serv.man2) Service Manual ▷ View online
SERVICE MANUAL
US Model
Canadian Model
CDX-C7850
SUPPLEMENT-1
File this supplement with the service manual.
Subject : Change of Main and Relay Boards
When performing service and inspection, check the suffix of the part number of
the main and relay boards.
the main and relay boards.
(ECN-CSA00017)
- RELAY BOARD - (SIDE A)
- MAIN BOARD - (SIDE A)
Main board Part No.
Former : 1-672-697-11
New : 1-672-697-12
Former : 1-672-697-11
New : 1-672-697-12
Relay board Part No.
Former : 1-672-698-11
New : 1-672-698-12
Former : 1-672-698-11
New : 1-672-698-12
– 2 –
For schematic diagrams
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
%
: indicates tolerance.
•
¢
: internal component.
•
C
: panel designation.
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS
AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
•
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
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
F
: FM
f
: AM
J
: CD
• (( )) : Page of service manual.
<< >> : Page of supplement-1.
For printed wiring boards
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
•
r
: Through hole.
•
¢
: internal component.
• b
: Pattern from the side which enables seeing.
(The other layer’s patterns are not indicated.)
The components identified by
mark
mark
! or dotted line with mark.
! are critical for safety.
Replace only with part number
specified.
Replace only with part number
specified.
Les composants identifiés par une
marque
marque
! sont critiques pour la
sécurité.
Ne les remplacer que par une piéce
portant le numéro spécifié.
Ne les remplacer que par une piéce
portant le numéro spécifié.
Caution:
Pattern face side: Parts on the pattern face side seen from the
(Side B)
Pattern face side: Parts on the pattern face side seen from the
(Side B)
pattern face are indicated.
Parts face side:
Parts on the parts face side seen from the
(Side A)
parts face are indicated.
• (( )) : Page of service manual.
<< >> : Page of supplement-1.
– 3 –
– 4 –
CDX-C7850
1. PRINTED WIRING BOARD — MAIN SECTION —
(IC206)
E-5
IC207
C-5
IC208
C-6
(IC211)
A-6
IC401
D-8
IC403
D-7
(IC404)
D-9
IC501
G-5
IC505
B-10
IC601
G-10
(IC602)
D-10
IC604
G-10
(IC606)
G-10
IC701
H-3
IC702
G-3
(Q11)
F-3
(Q12)
E-3
Q14
G-1
Q15
G-1
Q16
E-1
Q17
F-1
Q18
F-1
(Q19)
F-2
(Q51)
D-2
(Q201)
A-3
(Q202)
A-2
(Q203)
E-4
Q205
C-8
Q206
C-8
Q207
C-4
Q208
B-4
Q209
D-4
Q210
D-4
Q211
C-8
Q212
B-3
Q213
B-3
Q214
B-4
Q215
B-4
(Q401)
G-9
(Q402)
F-10
(Q403)
E-9
(Q404)
D-9
(Q405)
D-9
(Q501)
B-10
(Q502)
H-1
Q503
A-10
Q504
B-10
Q508
B-9
Q604
B-8
Q608
B-8
Q611
G-9
Q612
H-8
Q617
H-8
Q619
H-9
Q621
H-8
Q622
C-8
Q623
H-8
Q624
H-7
Q625
H-7
(Q626)
F-10
(Q627)
F-10
(Q628)
G-10
(Q629)
G-9
(Q630)
G-10
(Q631)
H-10
Q801
H-10
Q802
H-10
(D10)
E-2
(D11)
E-2
(D12)
E-1
(D13)
F-2
D201
F-7
D202
C-7
D203
C-8
D204
B-5
D205
B-5
D206
B-5
D207
B-6
D208
B-6
D209
B-6
D210
B-6
D211
B-6
D212
C-7
(D401)
F-8
(D402)
E-9
(D501)
F-7
D502
H-6
(D505)
B-10
D506
B-10
D507
B-10
(D508)
B-10
D509
B-10
(D510)
A-10
D511
B-10
D602
B-8
D603
B-8
D605
G-10
D606
F-10
D607
B-8
D608
F-10
D609
B-8
D610
G-9
D621
B-7
D622
B-7
D637
B-7
(D640)
C-7
D642
H-8
(D643)
G-10
(D644)
G-10
(D801)
B-10
(D802)
H-8
(D803)
B-10
(D804)
H-8
(D805)
H-8
(D806)
H-5
(D807)
H-9
(D808)
H-8
(D809)
H-8
(D810)
H-8
(D811)
H-8
(D812)
G-8
(D813)
G-8
(D814)
A-10
(D815)
H-8
(D816)
G-8
(D818)
G-7
D819
H-10
(D820)
G-8
IC10
D-2
IC11
F-2
IC201
E-4
IC202
E-5
(IC203)
E-5
IC204
E-4
IC205
B-2
• Semiconductor Location
Ref. No.
Location
Ref. No.
Location
(
) : SIDE B
CDX-C7850
– 5 –
– 6 –
((Page 15))
((Page 16))
<<Page 45>>
– 7 –
– 8 –
CDX-C7850
2. SCHEMATIC DIAGRAM — MAIN SECTION (1/4) —
Note:
• Voltage is dc with respect to ground under
• Voltage is dc with respect to ground under
no-signal (detuned) condition.
no mark : FM
(
no mark : FM
(
) : AM
((Page 12))
((P
age 9))
