Sharp 28KF-84H (serv.man10) Service Manual ▷ View online
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
33
28KF-84H
Red Output
Green Output
Blue Output
5
4
6
Video Output
+12V
E-W Output
V Switch
V Control St-By
Vp
Vertical Input
Inner Correction
E-W Control 2
7
8
9
10
11
12
13
14
15
Vertical+Input
H Control
VH (1.2kV)
16
17
18
34
28KF-84H
Vb (Horizontal)
Vc (Horizontal)
Headphone L Input
Headphone R Input
Speaker L Input
Speaker L Output
Speaker R Output
Speaker R Input
E-W Control 1
V Flyback Vertical
Vertical - Input
20
Vertical Output
25
26
27
28
29
30
IF Video Output
V Protection
H Protection
31
32
33
19
22
23
24
21
35
28KF-84H
H Flyback Pulse
R/C Pulses
+400V (Power Supply Voltage)
Power Supply Switch Voltage 1
I Sense CRT
IF Video In
Analog Y Out
Analog U Out
Analog V Out
SDA5550 Data D3
35
OSD Blanking
40
41
42
43
44
45
SDA5550 Address A
SDA2
SCL2
46
47
48
34
36
37
38
39
Power Supply Switch Voltage 2
