Sony MDS-JB940 Service Manual ▷ View online
33
6-3. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
(In addition to this, the necessary note is printed in each block)
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.
and tantalums.
• All resistors are in Ω and
1
/
4
W or less unless otherwise
specified.
•
%
: indicates tolerance.
•
f
: internal component.
• C : panel designation.
Note on Printed Wiring Board:
• X : parts extracted from the component side.
•
• X : parts extracted from the component side.
•
a
: Through hole.
• b : Pattern from the side which enables seeing.
• Indication of transistor.
• U : B+ Line.
• V : B– Line.
• Voltages are taken with a VOM (Input impedance 10 MΩ).
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.
E
: PB (ANALOG OUT)
a
: PB (DIGITAL OUT)
q
: REC (ANALOG IN)
r : REC (DIGITAL IN)
• Abbreviation
CND : Canadian model
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(Side B)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Side A)
the parts face are indicated.
B
These are omitted.
C
E
Q
• Abbreviation
CND
: Canadian model
B
These are omitted.
C
E
Q
Note:
The components identi-
fied by mark 0 or dotted
line with mark 0 are criti-
cal for safety.
Replace only with part
number specified.
The components identi-
fied by mark 0 or dotted
line with mark 0 are criti-
cal for safety.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque 0 sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce por tant le numéro
spécifié.
Les composants identifiés par
une marque 0 sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce por tant le numéro
spécifié.
6-4. CIRCUIT BOARD LOCATION
PSW board
AC board
BD board
AU board
SW board
DISP board
KEY board
HP board
34
6-5. WAVEFORMS
– BD Board –
1
IC101 ek (RF)
2
IC101 ef (FE)
(PLAY MODE)
3
IC101 wh (TE)
(PLAY MODE)
4
IC151 qh (OSCI)
5
IC151 wj (LRCK)
6
IC151 wk (XBCK)
7
IC151 o; (FS4)
8
IC171 3
1.3 Vp-p
0.2 Vp-p
1.6 Vp-p
3.1 Vp-p
3.2 Vp-p
3.8 Vp-p
3.2 Vp-p
45.158 MHz
44.1 kHz
2.8224 MHz
176.4 kHz
1.0 Vp-p
45.158 MHz
– MAIN Board –
1
IC1 w; (XOUT)
2
IC1 qk (CLOCK)
3
IC201 qs (XOUT)
3 Vp-p
10 MHz
1.6 Vp-p
32.768 MHz
5.2 Vp-p
45.158 MHz
MDS-JB940
35
35
6-6. PRINTED WIRING BOARD BD Board
• See page 33 for Circuit Board Location.
(KMS-260B/J1N)
(Page 43)
(Page 43)
Ref. No.
Location
• Semiconductor Location
Ref. No.
Location
D101
A-1 (A)
D181
D-3 (B)
D183
D-3 (B)
IC101
A-3 (B)
IC102
B-3 (B)
IC141
C-1 (B)
IC151
C-2 (B)
IC153
C-3 (B)
IC171
D-2 (B)
IC181
D-3 (B)
IC190
D-1 (B)
IC195
D-2 (B)
Q101
B-1 (A)
Q121
B-3 (B)
Q122
B-3 (B)
Q131
C-1 (A)
Q132
B-1 (A)
Q133
B-1 (A)
Q134
C-1 (A)
Q181
D-3 (B)
Q182
D-3 (B)
MDS-JB940
36
36
6-7. SCHEMATIC DIAGRAM BD Board (1/2)
• See page 34 for Waveforms.
• See page 48 for IC Block Diagrams.
• See page 53 for IC Pin Function.
(KMS-260B/J1N)
1
2
3
PIN FUNCTION
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