Sharp 28KF-84H (serv.man18) Service Manual ▷ View online
29
28KF-84H
X301
VR701
C746
(G)
C701
L701
R730
T702
+
C713
Q703
Q702
Q701
10
16
1
7
TP701
D720
C728
+
C733
+
IC304
IC302
IC301
(S)
IC706
IC708
Q797
IC704
L501
IC501
(YB)
(YA)
X201
SF201
SF202
TH201
(RGB)
(AV)
(AV1)
(CR)
(VIA)
Q612
(F)
L605
D638
Q601
(H)
Q602
T601
(L5)
(L2)
R614
TP601
TP602
R746
R747
C799
1
2
3
4
T701
IC502
IC503
IC303
IC201
4
1
(SWRC)
1
3
(AA)
(HD)
(L7)
1
(MO)
4
CHASSIS LAYOUT
PWB A- Mother Unit, F7351N5
30
28KF-84H
(YC)
3
1
X6001
IC6003
(YB)
(YA)
IC6002
X6002
X6003
(VI)
(K)
IC6007
IC6006
IC6001
PWB B- CRT Socket Unit, F7269N4
PWB C- TVTextPRO Digital Module Unit, F7353N3
(Q)
L864
(B)
Q5407
C
Q5408
(MO)
IC1601
(G2)
L2
(H)
(K)
(RT)
(SVM)
IC851
IC850
IC852
31
28KF-84H
PWB D- Power Switch Unit, FB452N0B
S6701
IS INDICATED WITH
THE ACTIVE SECTION
CAUTION
THE " " SYMBOL
B
FB452WJN0
KB452WJ
LP6701
F6701
1
2
3
(M)
(A)
2
1
S6704
S6703
S6702
ESPA¥A
T3.15AH
4
2
6
5
3
3
1
7
7
(HD)
(SS)
C6701
S6706
M6702
4
(SWRC)
1
(YC)
COLD
HOT
VOL(-)
VOL(+)
CH(DOWN)
CH(UP)
CAUTION !
32
28KF-84H
Waveform Measurement Condition
1. Test Equipment: Digital Oscilloscope; Colour TV Pattern Generator
2. Test Conditions: CH-12; Colour Bars; 70dB/
µ
V From RF Input
3. TV Condition: Picture and Audio : Settings Factory Presets ( Only in Audio Measures: Max. Volume With
Unplugged Speakers)
Unplugged Speakers)
SCHEMATIC DIAGRAMS
Description
!
Waveforms
NOTE:
1. The unit of resistance « ohm »is omitted (K=1000
ohms. M= Megaohm).
2. All resistors are 1/8 watt. unless otherwise noted.
3. All capacitors are
ohms. M= Megaohm).
2. All resistors are 1/8 watt. unless otherwise noted.
3. All capacitors are
µ
F, unless otherwise noted
(P=
µµ
F).
SERVICE PRECAUTION:
THE AREA ENCLOSED BY THIS LINE ( ) IS
DIRECTLY CONNECTED WITH AC MAINS VOLTAGE.
WHEN SERVICING THE AREA, CONNECT AN ISO-
LATING TRANSFORMER BETWEEN TV RECEIVER
AND AC LINE TO ELIMINATE HAZARD OF ELECTRIC
SHOCK.
DIRECTLY CONNECTED WITH AC MAINS VOLTAGE.
WHEN SERVICING THE AREA, CONNECT AN ISO-
LATING TRANSFORMER BETWEEN TV RECEIVER
AND AC LINE TO ELIMINATE HAZARD OF ELECTRIC
SHOCK.
CAUTION
This circuit diagram is original one, therefore
there may be slight difference from yours.
This circuit diagram is original one, therefore
there may be slight difference from yours.
SAFETY NOTE:
1. DISCONNECT THE AC PLUG FROM THE AC
OUTLET BEFORE REPLACING PARTS.
1. DISCONNECT THE AC PLUG FROM THE AC
OUTLET BEFORE REPLACING PARTS.
2. SEMICONDUCTOR HEAT SINKS SHOULD
BE REGARDED AS POTENTIAL SHOCK HAZ-
ARDS WHEN THE CHASSIS IS OPERATING.
BE REGARDED AS POTENTIAL SHOCK HAZ-
ARDS WHEN THE CHASSIS IS OPERATING.
IMPORTANT SAFETY NOTE:
PARTS MARKED WITH «
» (
)
ARE IMPORTANT FOR MAINTAINING THE
SAFETY OF THE SET. BE SURE TO REPLACE
THESE PARTS WITH SPECIFIED ONES FOR
MAINTAINING THE SAFETY AND PERFORM-
ANCE OF THE SET.
SAFETY OF THE SET. BE SURE TO REPLACE
THESE PARTS WITH SPECIFIED ONES FOR
MAINTAINING THE SAFETY AND PERFORM-
ANCE OF THE SET.
Red In
Green In
Blue In
1
3
2
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