Circuit Boards Location; Schematic Diagrams And Printed Wiring Boards - Sony Trinitron CPD-G420 Service Manual

5-3. CIRCUIT BOARDS LOCATION

DA
A1
D
N
H1
US
5-4. SCHEMATIC DIAGRAMS AND PRINTED
WIRING BOARDS
Note:
• All capacitors are in µF unless otherwise noted. (pF: µµF)
Capacitors without voltage indication are all 50 V.
• Indication of resistance, which does not have one for rating
electrical power, is as follows.
Pitch: 5 mm
Rating electrical power 1/4 W (CHIP : 1/10 W)
• All resistors are in ohms.
f
• : nonflammable resistor.
• : fusible resistor.
f
• : internal component.
p
• : panel designation, and adjustment for repair.
• All variable and adjustable resistors have characteristic curve B,
unless otherwise noted.
e
• : earth-ground.
E
• : earth-chassis.
[
• The components identified by in this basic schematic diagram
have been carefully factory-selected for each set in order to
satisfy regulations regarding X-ray radiation.
Should replacement be required, replace only with the value
originally used.
]
• When replacing components identified by , make the
necessary adjustments indicated. (See page 3-1)
• When replacing the part in below table, be sure to perform the
related adjustment.
Note: The components identified by shading and
mark ! are critical for safety. Replace only
with part number specified.
Note: Les composants identifiés par un tramé et
une marque ! sont critiques pour la
sécurité. Ne les remplacer que par une pièce
portant le numéro spécifié.
• All voltages are in V.
• Readings are taken with a 10 M digital multimeter.
• Readings are taken with a color-bar signal input.
• Voltage variations may be noted due to normal production
tolerances.
• : Can not be measured.
*
• Circled numbers are waveform references.
s
• : B + bus.
S
• : B – bus.
• Divided circuit diagram
One sheet of D board circuit diagram is divided into three sheets,
each having the code D-a to D-c. For example, the destination
ab1 on the code D-a sheet is connected to ab1 on the D-b sheet.
a b 1
Ref. No.
Circuit diagram division code
5-9
Part Replaced ([)
HV ADJ
RV901
Part Replaced (])
HV Regulator D Board C925, IC901, R901,
Circuit Check R902, R905, R924,
R925, R926, RV901,
T901 (FBT)
• Mounted D Board
HV Protector D Board C920, C923, D911,
Circuit Check D912, R903, R917,
R918, R919, R920,
R923, T901 (FBT)
• Mounted D Board
N Board IC1001, RB1001
• Mounted N Board
Beam Current D Board C930, D917, R921,
Protector Circuit R932, R933, R935,
Check T901 (FBT)
• Mounted D Board
N Board IC1001, RB1001
• Mounted N Board
Terminal name of semiconductors in silk screen
printed circuit ( )
*
Circuit
Device Printed symbol Terminal name
Collector
1 Transistor
Base Emitter
Collector
Transistor
2
Base Emitter
Cathode
3 Diode
Anode
Cathode
4 Diode
Anode (NC)
Cathode
5 Diode
(NC)
Anode
Common
6 Diode
Anode Cathode
Common
Diode
7
Anode Cathode
Common
8 Diode
Anode Anode
Common
9 Diode
Anode Anode
Common
0 Diode
Cathode
Cathode
Common
qa Diode
Cathode Cathode
Anode Cathode
qs Diode Anode Anode
Cathode Anode
Transistor Source
Drain
qd
D
(FET) Gate
G G
Source
Transistor
S
Drain
qf
(FET) Gate
D D
Source
Transistor
qg Drain G
(FET) Gate
S S
Emitter
qh Transistor Collector
Base
–
Discrete semiconductot
(Chip semiconductors that are not actually used are included.)
5-10
D
S
G
Ver.1.6