Sharp 25WG3, Service Manual

Page: 15 / 44

15
25WG3
WAVEFORMS
DESCRIPTION OF SCHEMATIC DIAGRAM
SAFETY NOTES:
1. DISCONNECT THE AC PLUG FROM THE AC
OUTLET BEFORE REPLACING PARTS.
2. SEMICONDUCTOR HEAT SINKS SHOULD BE
REGARDED AS POTENTIAL SHOCK HAZARDS
WHEN THE CHASSIS IS OPERATING.
IMPORTANT SAFETY NOTICE:
PARTS MARKED WITH " " ( )ARE
IMPORTANT FOR MAINTANING THE SAFETY OF
THE SET. BE SURE TO REPLACE THESE PARTS
WITH SPECIFIED ONES FOR MAINTAINING THE
SAFETY AND PERFORMANCE OF THE SET.
NOTES:
1. The unit of resistance "ohm" is omitted
(K: 1000 ohms M = Meg ohm).
2. All resistors are 1/8 watt, unless otherwise noted.
3. All capacitors
µ
F, unless otherwise noted.
(P =
µµ
F)
VOLTAGE MEASUREMENT CONDITIONS:
1. Voltage in parenthesis measured with no Signal.
2. Voltages without parenthesis measured with 3mV
B & W or colour-Signal.
3. All the voltages in each point are measured with
VTVM.
WAVEFORM MEASUREMENT CONDITIONS:
1. Colour bar generator signal of 1.0V peak to peak
applied pin (24) of IC201.
2. Approximately 4.0 V AGC bias.
SERVICE PRECAUTION:
THE AREA ENCLOSED BY THIS LINE ( )
IS DIRECTLY CONNECTED WITH AC MAINS VOLT-
AGE.
WHEN SERVICING THE AREA, CONNECT AN
ISOLATING TRANSFORMER BETWEEN TV RE-
CEIVER AND AC LINE TO ELIMINATE HAZARD
OF ELECTRIC SHOCK.