Sony KDL-46CX525 (serv.man2) Service Manual ▷ View online
5
KDL-46CX525
KDL-46CX525
SAFETY CHECK-OUT
After correcting the original service problem, perform the
following safety checks before releasing the set to the customer:
following safety checks before releasing the set to the customer:
1. Check the area of your repair for unsoldered or poorly soldered
connections. Check the entire board surface for solder splashes and
bridges.
bridges.
2. Check the interboard wiring to ensure that no wires are “pinched” or
touching high-wattage resistors.
3. Check that all control knobs, shields, covers, ground straps, and
mounting hardware have been replaced. Be absolutely certain that
you have replaced all the insulators.
you have replaced all the insulators.
4. Look for unauthorized replacement parts, particularly transistors,
that were installed during a previous repair. Point them out to the
customer and recommend their replacement.
customer and recommend their replacement.
5. Look for parts which, though functioning, show obvious signs of
deterioration. Point them out to the customer and recommend their
replacement.
replacement.
6. Check the line cords for cracks and abrasion. Recommend the
replacement of any such line cord to the customer.
7. Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground
and from all exposed metal parts to any exposed metal part
and from all exposed metal parts to any exposed metal part
having a return to chassis, must not exceed 0.5 mA (500
microamperes). Leakage current can be measured by any one of
three methods.
microamperes). Leakage current can be measured by any one of
three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instructions.
instructions.
2. A battery-operated AC milliampmeter. The Data Precision 245 digital
multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The “limit” indication is 0.75
V, so analog meters must have an accurate low voltage scale.
The Simpson’s 250 and Sanwa SH-63TRD are examples of
passive VOMs that are suitable. Nearly all battery-operated digital
multimeters that have a 2 VAC range are suitable. (see Figure A)
V, so analog meters must have an accurate low voltage scale.
The Simpson’s 250 and Sanwa SH-63TRD are examples of
passive VOMs that are suitable. Nearly all battery-operated digital
multimeters that have a 2 VAC range are suitable. (see Figure A)
To Exposed Metal
Parts on Set
0.15 µF
Earth Ground
AC
Voltmeter
(0.75V)
Figure A. Use an AC voltmeter to check AC leakage.
HOW TO FIND A GOOD EARTH GROUND
The cover-plate retaining screw on most AC outlet boxes is at
earth ground. Verify the AC outlet box retaining screw ground
by connecting a 60-to 100-watt trouble-light (not a neon lamp)
between the hot side of the receptacle and the retaining screw.
earth ground. Verify the AC outlet box retaining screw ground
by connecting a 60-to 100-watt trouble-light (not a neon lamp)
between the hot side of the receptacle and the retaining screw.
Try both slots, if necessary, to locate the hot side on the line; the
lamp should light at normal brilliance if the screw is at ground
potential. (see Figure B)
lamp should light at normal brilliance if the screw is at ground
potential. (see Figure B)
Figure B. Checking for earth ground.
Trouble Light
AC Outlet Box
6
KDL-46CX525
KDL-46CX525
The circuit boards used in these models have been processed using
Lead Free Solder. The boards are identified by the LF logo located
close to the board designation e.g. H1 etc [ see example ]. The
servicing of these boards requires special precautions to be taken as
outlined below.
Lead Free Solder. The boards are identified by the LF logo located
close to the board designation e.g. H1 etc [ see example ]. The
servicing of these boards requires special precautions to be taken as
outlined below.
example
It is strongly recommended to use Lead Free Solder material in order to guarantee optimal quality of new solder joints.
Lead Free Solder is available under the following part numbers :
Lead Free Solder is available under the following part numbers :
Due to the higher melting point of Lead Free Solder the soldering iron tip temperature needs to be set to 370 degrees centigrade.
This requires soldering equipment capable of accurate temperature control coupled with a good heat recovery characteristics.
This requires soldering equipment capable of accurate temperature control coupled with a good heat recovery characteristics.
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1
7
KDL-46CX525
KDL-46CX525
SECTION 1: DIAGRAMS
1-1. CIRCUIT BOARDS LOCATION
1-2. PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS INFORMATION
All voltages are in V.
S : Measurement impossibility.
: B+line.
: B-line. (Actual measured value may be different).
: signal path. (RF)
Circled numbers are waveform references.
The components identified by shading and
!
symbol are critical for safety. Replace
only with part number specified.
The symbol
indicates a fast operating fuse and is displayed on the component
side of the board. Replace only with fuse of the same rating as marked.
NOTE: The components identified by a red outline and a mark contain confidential
information. Specific instructions must be adhered to whenever these components
are repaired and/or replaced.
See Appendix A: Encryption Key Components in the back of this manual.
are repaired and/or replaced.
See Appendix A: Encryption Key Components in the back of this manual.
All capacitors are in µF unless otherwise noted. pF : µµF 50WV or
less are not indicated except for electrolytics and tantalums.
All electrolytics are in 50V unless otherwise specified.
All resistors are in ohms. k
less are not indicated except for electrolytics and tantalums.
All electrolytics are in 50V unless otherwise specified.
All resistors are in ohms. k
Ω=1000Ω, MΩ=1000kΩ
Indication of resistance, which does not have one for rating
electrical power, is as follows:
electrical power, is as follows:
Pitch : 5mm
Rating
electrical
power
:
1
/
4
W
1
/
4
W in resistance,
1
/
10
W and
1
/
16
W in chip resistance.
: 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.
unless otherwise noted.
Readings are taken with a color-bar signal input.
Readings are taken with a 10M
Ω digital multimeter.
Voltages are DC with respect to ground unless otherwise noted.
Voltage variations may be noted due to normal production
tolerances.
tolerances.
SWITCH
UNIT
HLR2
HMS3
G3
BATV
TCON
INV
8
KDL-46CX525
KDL-46CX525
REFERENCE INFORMATION
RESISTOR
: RN
: RN
METAL FILM
: RC
SOLID
: FPRD NONFLAMMABLE CARBON
: FUSE NONFLAMMABLE FUSIBLE
: RW
: FUSE NONFLAMMABLE FUSIBLE
: RW
NONFLAMMABLE WIREWOUND
: RS
NONFLAMMABLE METAL OXIDE
: RB
NONFLAMMABLE CEMENT
:
ADJUSTMENT RESISTOR
COIL
: LF-8L MICRO INDUCTOR
: LF-8L MICRO INDUCTOR
CAPACITOR
: TA
: TA
TANTALUM
: PS
STYROL
: PP
POLYPROPYLENE
: PT
MYLAR
: MPS
METALIZED POLYESTER
: MPP
METALIZED POLYPROPYLENE
: ALB
BIPOLAR
: ALT
HIGH TEMPERATURE
: ALR
HIGH RIPPLE
G
D
S
B1 E1
C2
B2 C1
E2
2
3
4
5
6
7
8
9
–
1
G
D
S
B2 E2
C1
B1 C2
E1
B2 E2
C1
B1 C2
E1
B2 E2
C1
B1 C2
E1
B1 E1
E2
C1(B2)
C2
B1
E2
C1
C2
(B2)
E1
(B2)
E1
E2
B1
C2
C1
B1
E1
C2
B2
C1
E2
G
S
S
D
G
D
B1
E1
C2
B2
C1
E2
B1
E2
C2
C1(B2)
E2
B1
C1
C2
E1(B2)
C2
B1
C1
E2
E1(B2)
C2
B1
C1
E2
B2
E1
C2
Ver.1.6
Transistor
(FET)
(FET)
Transistor
Transistor
Transistor
Transistor
Transistor
Transistor
Transistor
Transistor
Transistor
Discrete semiconductor
(Chip semiconductors that are not actually used are included.)
Diode
Diode
Diode
Diode
Diode
Diode
Diode
Diode
Diode
Diode
Source
Source
Anode
Anode
(NC)
(NC)
Cathode
Anode
Cathode
Common
Cathode
Cathode
Common
Cathode
Cathode
Common
Common
Common
Common
Cathode
Anode
Base
Emitter
Collector
Base
Emitter
Collector
Drain
Gate
Gate
Drain
Device
Printed symbol
Terminal name
Circuit
Terminal name of semiconductors in silk screen
printed circuit ( )
Anode
Anode
Anode Cathode
Anode Anode
Cathode
Transistor
(FET)
(FET)
Transistor
(FET)
(FET)
Emitter
Collector
Base
Transistor
Source
Gate
Drain
Cathode
Anode
Anode
Cathode
Anode
Anode
*
18
11
17
16
15
14
13
12
10
21
20
19
23
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