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BM-21, BM-23 (serv.man3) - Sony Audio Service Manual (repair manual). Page 10

Read Sony BM-21 / BM-23 (serv.man3) Service Manual online

10
BM-21/23
SECTION  4
DIAGRAMS
•
Note for Printed Wiring Boards and Schematic Diagrams
Note on Schematic Diagram:
•
All capacitors are in 
µ
F unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics
and tantalums.
•
All resistors are in 
Ω
 and 
1
/
4
 
W or less unless otherwise
specified.
•
2
: nonflammable resistor.
•
C
: panel designation.
•
H
: adjustment for repair.
•
A
: B+ Line.
•
Total current is measured with no cassette installed.
•
Power voltage is dc 3V and fed with regulated dc power
supply from battery terminal.
•
Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal production
tolerances.
•
Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.
No mark : PB (LISTEN)
(
) : REC (DICT)
•
Circled numbers refer to waveforms.
•
Signal path.
E
: PB (LISTEN)
a
: REC (DICT)
Note on Printed Wiring Board:
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
: Pattern from the side which enables seeing.
Caution:
Pattern face side: Parts on the pattern face side seen from
(Side A)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Side B)
the parts face are indicated.
1
 
IC701
 
wd
 (OSC) 
2.1 Vp-p
1 
µ
s 
1 V/DIV, 500 ns/DIV
• Waveforms
– LCD Board –
   Note:
The components identi-
fied by mark 
0
  or dot-
ted line with mark 
0
 are
critical for safety.
Replace only with part
number specified.
   Note:
Les composants identifiés
par une marque 
0
 sont cri-
tiques pour la sécurité.
Ne les remplacer que par une
piéce por tant le numéro
spécifié.
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