Sony DSR-250, Service Manual

Page: 90 / 322

DSR-250/250P
4-2. PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
(Measuring conditions voltage and waveform)
• Voltages and waveforms are measured between the measure-
ment points and ground when camera shoots color bar chart of
pattern box. They are reference values and reference wave-
forms.
*
(VOM of DC 10 M
Ω
input impedance is used.).
• Voltage values change depending upon input impedance of VOM
used.) *
1. Connection
2. Adjust the distance so that the output waveform of Fig. a and
the Fig. b can be obtain.
Y
ello
w
A A B B A=B
Fig. a (Video output terminal output waveform)
Fig.b (Picture on monitor TV)
Electron beam
scanned frame
CRT picture frame
H
Cy
an
Green
White
Magenta
Red
Blue
Y
ello
w
Cy
an
Green White
Magenta
Red
Blue
THIS NOTE IS COMMON FOR WIRING BOARDS AND SCHEMATIC DIAGRAMS
(In addition to this, the necessary note is printed in each block)
C
B E
5 6 4
2 1 3
5 4 6
2 3 1
4 5
2 3 1
1 2
4 5 3
3
2 1
3
2 1
3
2 1
Transistor Diode
Kinds of capacitor
Temperature characteristics
External dimensions (mm)
When indicating parts by reference number, pleas include
the board name.
(For printed wiring boards)
•
b : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
• Through hole is omitted.
• Circled numbers refer to waveforms.
• There are few cases that the part printed on diagram
isn’t mounted in this model.
• Chip parts.
(For schematic diagrams)
• All capacitors are in mF unless otherwise noted. pF : m mF. 50V
or less are not indicated except for electrolytics and tantalums.
• Chip resistors are 1/10W unless otherwise noted.
kW=1000W, MW=1000kW.
• 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, Be-
cause it is damaged by the heat.
• Some chip part will be indicated as follows.
Example C541 L452
22U 10UH
TA A 2520
• Constants of resistors, capacitors, ICs and etc with XX indicate
that they are not used.
In such cases, the unused circuits may be indicated.
• All variable and adjustable resistors have characteristic curve B,
unless otherwise noted.
• Signal name
XEDIT
→
EDIT PB/XREC
→
PB/REC
•
2
: non flammable 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. *
* Indicated by the color red.
DSR-250/250P
4-8
Note :
The components identified by
mark
0 or dotted line with mark
0
are critical 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
pièce portant le numéro spécifié.
95cm
Pattern box
Front of the protection glass