Sony KV-21FE12B Service Manual ▷ View online
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— 28 —
KV-21FE12B
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KV-21FE12B
A Board
CB Board
MB Board
VB Board
— 29 —
A BOARD: IC502 TDA8172
PLACA A - DIAGRAMAS DE BLOCOS DOS IC's
A BOARD: IC401 TDA7057AQ/N2
DC Volume Control 1
Input 1
Positive Output 1
Negative Output 1
Power
Ground 1
Signal
Ground
TEMPERATURE
PROTECTION
STABILIZER
REF
V
P
V
I + i
I – i
+
–
4
3
1
+
–
13
11
7
5
DC Volume Control 2
Input 2
I + i
I – i
1
2
Positive Output 2
Negative Output 2
10
8
2
6
12
9
Power
Ground 2
n.c.
6-3. PLACAS DE CIRCUITO IMPRESSO E
ESQUEMAS ELÉTRICOS
• All capacitors are in
µ
F unless otherwise noted.
pF:
µµ
F 50 WV or less are not indicated except for
electrolytic and tantalums.
• All electrolytics are 50V unless otherwise specified.
• Indication of resistance, which does not have one for
rating electrical power, is as follows:
Pitch: 5mm
Rating electrical power 1/4W (CHIP: 1/10W)
• All resistors are in ohms.
K
Ω
= 1000
Ω
M
Ω
= 1000K
Ω
•
: nonflammable resistor
•
: fusible resistor
•
: internal component
•
: panel designation and adjustment for repair
•
: earth-ground
•
: earth-chassis
• All variable and adjustable resistors have characteristic
curve B, unless otherwise noted.
• The components identified by
in this manual 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.
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. If results do not meet
the specified value, change the component identified
by
the specified value, change the component identified
by
and repeat the adjustment until the specified value
is achieved (refer to Safety Related Adjustments on
page 19).
page 19).
• When replacing parts shown in the table below, be sure
to perform the related adjustments.
6.2 LOCALIZAÇÃO DAS PLACAS DE CIRCUITO IMPRESSO
Part Replaced ( )
Adjustment ( )
HV HOLD-DOWN
(R562)
(R562)
B+ VOLTAGE
CONFIRMATION
CONFIRMATION
DY, T505, CRT, IC501, C507,C520,
C505, C509, C515, T504,L508,
C551, L510, C546, C537, C547,
D517, D518, D519, R560,R561,
R562, R563, R565, R566, R567,
R525.....................................A Board
C505, C509, C515, T504,L508,
C551, L510, C546, C537, C547,
D517, D518, D519, R560,R561,
R562, R563, R565, R566, R567,
R525.....................................A Board
IC1301...............................MB Board
IC601, PH601...................A Board
• All voltages are in Volts.
• Voltage is DC with respect to ground unless otherwise
noted.
• Readings are taken with a 10MW digital multimeter.
• Readings are taken with a color-bar signal input.
• Voltage variations may be noted due to normal
• Readings are taken with a color-bar signal input.
• Voltage variations may be noted due to normal
production tolerance.
• Circled numbers are waveform references.
• *
• *
: cannot be measured
•
: B + Line
•
-----
: B
−
Line
•
: Signal path
Reference Information
RESISTOR
:
RN
METAL FILM
:
RC
SOLID
:
FPRD
NON FLAMMABLE CARBON
:
FUSE
NON FLAMMABLE FUSIBLE
:
RW
NON FLAMMABLE WIREWOUND
:
RS
NON FLAMMABLE METAL OXIDE
:
RB
NON FLAMMABLE CEMENT
:
ADJUSTMENT RESISTOR
COIL
:
LF-8L
MICRO INDUCTOR
CAPACITOR
:
TA
TANTALUM
:
PS
STYROL
:
PP
POLYPROPYLENE
:
PT
MYLAR
:
MPS
METALIZED POLYESTER
:
MPP
METALIZED POLYPROPYLENE
:
ALB
BIPOLAR
:
ALT
HIGH TEMPERATURE
:
ALR
HIGH RIPPLE
The components identified by shading and
mark
are critical for safety. Replace only with the part
number specified.
The symbol
number specified.
The symbol
(displayed on component side of the
circuit board) indicates fast operating fuse. Replace
only with fuse of the same rating as marked.
only with fuse of the same rating as marked.
Note:
Les composants identifiés per un tramé et une
marque
marque
sont critiques pour la sécurité. Ne les
remplacer que par une piéce portant le numéro
spécifié. Le symbole
spécifié. Le symbole
indique une fusible a
action rapide. Doit etre remplacee par une fusible de
meme yaleur, comme marque.
meme yaleur, comme marque.
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HZ Board
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