Note For Printed Wiring Boards And Schematic Diagrams; Circuit Board Location - Sony MDS-JB940 Service Manual

6-3. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

(In addition to this, the necessary note is printed in each block)
Note on Printed Wiring Board:
• X : parts extracted from the component side.
: Through hole.
•
a
• b : Pattern from the side which enables seeing.
• Indication of transistor.
Caution:
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.
Q
B C E
These are omitted.
Q
B C E
These are omitted.
• Abbreviation
CND : Canadian model

6-4. CIRCUIT BOARD LOCATION

PSW board
HP board
KEY board
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 Ω and
specified.
•
•
• C : panel designation.
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.
• 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.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
E
a
q
r : REC (DIGITAL IN)
• Abbreviation
CND : Canadian model
AC board
DISP board
1
/ W or less unless otherwise
4
% : indicates tolerance.
: internal component.
f
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.
: PB (ANALOG OUT)
: PB (DIGITAL OUT)
: REC (ANALOG IN)
BD board
AU board
SW board
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