Sony Trinitron KV-25XBR Service Manual page 109

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SONY
TRINITRON® COLOR TV
KV-25XBR/RM-724
US Model
Chassis No. SCC-5958-A
WARNING!!
AN ISOLATION TRANSFORMER SHOULD BE USED
DURING ANY SERVICE TO AVOID POSSIBLE SHOCK
HAZARD, BECAUSE OF LIVE CHASSIS.
THE CHASSIS OF THIS RECEIVER IS DIRECTLY CON•
NECTED TO THE AC POWER LINE.
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY SHADING AND MARK
Lr;
ON THE SCHEMATIC DIAGRAMS, EXPLODED
VIEWS AND IN THE PARTS LIST ARE CRITICAL TO
SAFE OPERATION. REPLACE THESE COMPONENTS
WITH SONY PARTS WHOSE PART NUMBERS APPEAR
AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS
THAT ARE CRITICAL TO SAFE OPERATION ARE
IDENTIFIED IN THIS MANUAL. FOLLOW THESE PRO-
CEDURES WHENEVER CRITICAL COMPONENTS ARE
REPLACED OR IMPROPER OPERATION IS SUSPECTED.
Note: The components identified by shading and mark
&
are critical for safety. Replace only with
part number specified.
Note:
• All Capacitors are in µF unless otherwise noted, pF: µµF
50 WV or less are not indicated except for electrolytics.
• All resistors are in ohms. 1 /6W unless otherwise noted.
kn= 1000n, Mn= 1oookn
• Standard for the M Board is 1 /4W:
•
~ : nonflamable resistor.
• 6 : internal component.
• C==:J :
panel designation.
• All variable and adjustable resistors have characteristics
curve B, unless otherwise noted.
• The components indentified by B 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.
• When replacing components identified by
~
mark
the necessary adjustments indicated. If results do not
meet the specified value, change the component identified
by
8
and repeat the adjustment until the specified
value is achieved.
(Refer to R1531, R1534, R1535, R1556, R1578 adjust-
ment on page 29.)
When replacing the ,part in below table, be sure to per-
form the related adjustment.
Part replaced ( ~ ) Adjustment (
B )
D1502,D1507,IC1501
01502, 01503, R427
R431,R437,R438
R1512,R1519,R1529 R1531
R1530,R1531,R1532
R1533,R1543,R1544
R1545
D1508, D1509, IC301
IC401, 01506, R339
R340, R348, R436
R1534,R1535
R1534,R1535,R1537
R1538,R1539,R1561
R1576
C1663,C1664,C1667
C1675, IC1502, L1514
R1556,R1570,R1635
R1556
R1636, R1638, RV1511
FBT, DY
C1519,C1663,C1664
C1667,C1675, IC1501
L1514,R1522,R1578
R1578
R1579,R1580,R1581
R1582,R1583,RV1503
FBT, DY
• All voltages are in V.
• Voltages are de with respect to ground unless otherwise
noted.
• Readings are taken with a 10Mn digital multimeter.
• Readings are taken with a color-bar signal input.
• -- : B +bus.
• - - - : B - bus.
• Voltage variations may be noted due to normal produc-
tion tolerances.
• [:=J :
adjustment for repair.
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12
13
CAUTION
When replacing IC651, be sure to check the test
point voltage value (TP91 ), Referto the Safety
Adjustments Section.
GB (
140V REG, l40VRECT, 16VRECT
SV RECT
1
30V RECT
'4~8~
IC~~~Jl:,121
0658 30 V~~~;l2$
0661ev:~c~2M
D655 CTV-24S
t~OV R£CT
0656 15 VCRT£};l2S
D657tv~(~?~
14
15
CAUTION
This set is equipped with a polarized ac power cord
plug (one blade of thJf"plug is wider than the other).
When replacing the ac power cord, be sure to connect
it with specified part number as shown in this diagram.
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