Akai PDP4216M, Руководство по обслуживанию, Страница: 71 / 86

English
3-2. FET Ass’y(Y B/D: HS11, 51, 91) damage
(1) When Set_Up FET is damaged, screen doesn’t be shown
O
Test Point: Enlarge the after measuring GND~B1(Y B/D)
O
Waveform state: As shown (Fig. 2)
(2) When Set_Down FET/Pass_Top FET is damaged, mis
discharge of entire screen is generated.
O
Test Point: Enlarge the after measuring GND~B1(Y B/D)
O
Waveform state: As shown (Fig. 3)
(3) When Ramp FET is damaged
O
Test Point: Enlarge the after measuring GND~B1(Y B/D)
O
Waveform state: As shown (Fig. 4)
O
Measurement position: Reset section enlargement wave
of TP B1(Y B/D) (Full White Pattern)
Set Up waveform
does not come out
- 15 -
(Fig. 2) When the Set_Up FET is damaged
Set Down waveform
does not come out
(Fig. 3) When the Set_Down FET is damaged
(Fig. 4) When the Ramp FET is damaged
<FET Ass’y Normal Output Waveform >
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