Sharp 21XF30, Service Manual

Page: 31 / 58

31
21XF30
21XF50
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 OP-
ERATING.
IMPORTANT SAFETY NOTICE:
PARTS MARKED WITH "
å
" ( ) ARE IMPORTANT FOR
MAINTAINING THE SAFETY OF THE SET. BE SURE TO REPLACE
THESE PARTS WITH SPECIFIED ONES FOR MAINTAINING THE
SAFETY AND PERFORMANCE OF THE SET.
SERVICE PRECAUTION:
THE AREA ENCLOSED BY THIS LINE ( —– - —– ) IS DIRECTLY
CONNECTED WITH AC MAINS VOLTAGE.
WHEN SERVICING THE AREA, CONNECT AN ISOLATING TRANS-
FORMER BETWEEN TV RECEIVER AND AC LINE TO ELIMINATE
HAZARD OF ELECTRIC SHOCK.
NOTES:
1. The unit of resistance "ohm" is omitted.
(K = 1000 ohms, M = Mega ohm).
2. All resistors are 1/16 watt, unless otherwise noted.
3. All capacitors are
µ
F, unless otherwise noted. (P =
µµ
F).
VOLTAGE MEASUREMENT CONDITIONS:
1. Voltages in parenthesis measured with no signal.
2. Voltages without parenthesis measured with 3mV B & W or Col-
our signal.
3. All the voltages in each point are measured with VTVM.
WAVEFORM MEASUREMENT CONDITIONS:
1. The colour bar generator signal of 1.0V peak applied at pin (24)
of IC201.
2. Approximately 4V AGC bias .
Horiz Rate
Vert Rate
Vert Rate Vert Rate Horiz Rate Horiz Rate
Vert Rate Horiz Rate Horiz Rate Horiz Rate Vert Rate Horiz Rate
Horiz Rate Horiz Rate Horiz Rate Horiz Rate Horiz Rate Horiz Rate
1) 0.98 Vp-p
3) 3.68 Vp-p
2) 4.08 Vp-p
4) 4.2 Vp-p 5) 88.8 Vp-p 6) 107.2 Vp-p
7) 109.6 Vp-p 8) 3.32 Vp-p
9) 2.28 Vp-p
10) 138 Vp-p
11) 9.12 Vp-p 12) 0.13 Vp-p
13) 0.18 Vp-p 15) 55.2 Vp-p 16) 170 Vp-p
17) 1104 Vp-p
19) 1.9 Vp-p (V)
18) 324 Vp-p (AC110V)
485 Vp-p (AC220V)
14) 5.72 Vp-p