Pioneer PDP-5016, Service Manual

Page: 60 / 70

3. Checking for Component Damage
3-1. Y IPM(IC2, IC7) or Z IPM(IC9, IC11) Damage
(1) When the internal Sustain_FET of Y IPM or Z IPM is
damaged, screen doesn’t be shown or electric discharge is
generated.
O
Test Point: GND~B41(Y B/D), GND~B11(Z B/D)
O
Wave format: B41(Y B/D) or B11(Z B/D) has no wave
output
(2) When the internal ER_FET of Y IPM or Z IPM is damaged,
Y IPM or Z IPM emission is increased.
O
Test Point: GND~B41(Y B/D), GND~B11(Z B/D)
O
Wave format: As shown (Fig. 1)
O
Measurance position: Y B/D(B41), Z B/D(B11)
Sustain section enlarge(Full White Pattern)
3-2. FET Ass’y(Y B/D: HS2, 5, 6) Damage
(1) When Set_Up FET is damaged, screen doesn’t be shown
O
Test Point: Enlarge the after measuring GND~B41(Y B/D)
O
Wave format: As shown (Fig. 2)
(2) When Set_Down FET is damaged, electric discharge of
entire screen is generated.
O
Test Point: Enlarge the after measuring GND~B41(Y B/D)
O
Wave format: As shown (Fig. 3)
O
Measurance position: Reset section enlargement wave of
B41(Y B/D) (Full White Pattern)
Set Up waveform
does not come out
(Fig. 1) When the ER_FET is damaged
<IPM Normal Output Wave >
(Fig. 2) When the Set_Up FET is damaged
(Fig. 3) When the Set_Down FET is damaged
<FET Ass’y Normal Output Wave >
Set Down waveform
does not come out
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