Sony DSR-20MD, Service Manual

Page: 27 / 225

4-1
SECTION 4
PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
For printed wiring boards:
•
b : Pattern from the side which enables seeing.
(The other layers’ pattern are not indicated)
• Circled numbers refer to waveforms.
• Through hole is omitted.
• There are few cases that the part printed on diagram isn’t
mounted in this model.
• Chip parts.
For schematic Diagram:
•
All capacitors are in µF unless otherwise noted. pF : µµF
50V or less are not indicated except for electrolytics and
tantalums.
• Chip resistors are 1 /
10
W unless otherwise noted.
k
Ω
: 1000
Ω
, M
Ω
: 1000k
Ω
.
• Caution when replacing chip parts.
New parts must be attached after removal of chip.
Be careful not to heat the minus side of tantalum capacitor,
because it is damaged by the heat.
• Some chip part will be indicated as follows.
• Constants of resistors, capasitors, ICs and etc with XX indi-
cate that they are not used. In such cases, the unused cir-
cuits may be indicated.
• Parts with
★
differ according to the model/destination. Re-
fer to the mount table for each function.
• All variable and adjustable resistors have characteristic curve
B, unless otherwise noted.
• Signal name
XEDIT
→
EDIT PB/XREC
→
PB/REC
•
2
: nonflammable resistor.
• 1 : fusible resistor.
• C : panel designation.
• A : B+ Line. *
•
B
: B– Line. *
•
J
: IN/OUT direction of B line (+, –). *
• C : adjustment for repair.
*
• Circled numbers refer to waveforms. *
2 1
3
2 1
3
2 1
3
3 4 5
2 1
1 2 3
6 5 4
E B
C
3 1
5 5
2
4 6
1 2 3
5 4
Transistor Diode
Example C 541
22U
TA A
L 452
10UH
2520
Kinds of Temperature External
capacitor characteristics dimensions (mm)
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block)
Measuring conditions voltege and waveform:
•
Voltages and waveforms are measured between the mea-
surement points and graound when color bar signal
input.They are reference values and reference waveforms.
*
(VOM of DC 10 M
Ω
input impedance is used)
• Voltage values change depending upon input impedance
of VOM used.
* Indicated by the color red.
DSR-20MD/20MDP
When indicating parts by reference
number, please include the board
name.
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.
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.