Read Sharp 28JF-73H (serv.man21) Service Manual online
37
28JF-73H
Waveform Measurement Condition:
1. Test Equipment: DIGITAL SLPE LECROY.
2. Test Conditions: CH-12; COLOUR BARS; 70dB FROM RF INPUT
3. TV Condition: PICTURE AND AUDIO : SETTINGS ! FACTORY PRESETS
DESCRIPTION OF SCHEMATIC DIAGRAMS
!
Pin1 Vp-p= 2.9V
Pin2 Vp-p= 2.9V
1
2
3
Waveform:
Pin3 Vp-p= 3.0V
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.
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