Section 4 Diagrams - Sony BM-21 Service Manual

BM-21/23
• Note for Printed Wiring Boards and Schematic Diagrams
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.
• Waveforms
– LCD Board –
1
IC701 wd (OSC)
1 µ s
1 V/DIV, 500 ns/DIV
10
SECTION 4
DIAGRAMS
2.1 Vp-p
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and
1
/ W or less unless otherwise
4
specified.
• 2 : nonflammable resistor.
• C : panel designation.
• H : adjustment for repair.
Note:
Note:
Les composants identifiés
The components identi-
par une marque 0 sont cri-
fied by mark 0 or dot-
ted line with mark 0 are
tiques pour la sécurité.
Ne les remplacer que par une
critical for safety.
piéce por tant le numéro
Replace only with part
spécifié.
number specified.
• 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 MΩ).
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)