21F-PD250 / 21F-PT220 / 21F-PA18 / 21F-PA18(B)
5
–
2
TROUBLE
SHOOTING
FLOWCHART
(
C
o
ntinue
d)
Does signal appear at pins
(8) of IC301 ?
NO SOUND
CIRCUITS TO BE CHECKED:
Sound Detector Circuit.
Sound Switch and Att.
Control.
Audio Output Circuit.
Check signal appear from pin (50)
of IC801 to pin (4) of
IC301.
NEITHER VERTICAL NOR
HORI
Z
ONTAL S
Y
NCHRONI
Z
ATION
CIRCUIT TO BE CHECKED:
Sync. Separator Circuit.
Check pins(9), (13) and (14)
of IC801.
Check Speaker.
Check IC301 and
peripheral circuit.
NO VERTICAL SCAN
Check IC501.
Check C511.
Check IC501 bias.
Summary of Contents for 21F-PA18
Page 64: ...21F PD250 21F PT220 21F PA18 21F PA18 B 7 1 CHAPTER 7 CHASSIS LAYOUT 1 CHASSIS LAYOUT ...
Page 65: ...21F PD250 21F PT220 21F PA18 21F PA18 B 7 2 ...
Page 66: ...21F PD250 21F PT220 21F PA18 21F PA18 B 8 1 CHAPTER 8 BLOCK DIAGRAM 1 BLOCK DIAGRAM MAIN UNIT ...
Page 67: ...21F PD250 21F PT220 21F PA18 21F PA18 B 8 2 ...
Page 68: ...21F PD250 21F PT220 21F PA18 21F PA18 B 8 3 ...
Page 69: ...21F PD250 21F PT220 21F PA18 21F PA18 B 8 4 ...
Page 70: ...21F PD250 21F PT220 21F PA18 21F PA18 B 8 5 2 BLOCK DIAGRAM CRT UNIT ...
Page 72: ...21F PD250 21F PT220 21F PA18 21F PA18 B 10 1 CHAPTER 10 WAVEFORMS 1 WAVEFORMS ...
Page 74: ...21F PD250 21F PT220 21F PA18 21F PA18 B 11 2 2 SCHEMATIC DIAGRAM MAIN UNIT ...
Page 75: ...21F PD250 21F PT220 21F PA18 21F PA18 B 11 3 ...
Page 76: ...21F PD250 21F PT220 21F PA18 21F PA18 B 11 4 ...
Page 77: ...21F PD250 21F PT220 21F PA18 21F PA18 B 11 5 10 11 12 13 14 15 16 17 18 19 ...
Page 79: ...21F PD250 21F PT220 21F PA18 21F PA18 B 12 2 2 PWB A MAIN CHIP SIDE ...