Pioneer PDP-4280HD Service Manual page 136

1
A
SUS-B ADJUSTMENT
X DRIVE Assy
from
DIGITAL Assy
XSUS-U
B
1 Measure the SUS-U and SUS-B
from
DIGITAL Assy
XSUS-B
C
Y DRIVE Assy
from
DIGITAL Assy
YSUS-U
1 Measure the SUS-U and SUS-B
D
from
DIGITAL Assy
YSUS-B
E
SUS-D ADJUSTMENT
Y DRIVE Assy
1 Measure the SUS-D pulse width (Tsus - D).
from
DIGITAL Assy
F
YSUS-D
136
1
2
IC1104
IC1002_A1 IC1101
Photo
Coupler
Pin
2
input delay time (Δ Tsus - iub).
VR1002
IC1204
IC1001_A1
Photo
Pin Coupler
2
IC2103
IC2001_A4 IC2101
Photo
Coupler
Pin
5
input delay time (Δ Tsus - iub).
VR2002
IC2201
IC2001_A6
Photo
Pin Coupler
7
VR2001
IC2005_A7
Pin
8
2
3
2 Adjust the SUS-U and SUS-B input
delay time so that it becomes
"Δ Tsus - iub + 70 ± 5 nsec."
IC1209
2 Adjust the SUS-U and SUS-B input
delay time so that it becomes
"Δ Tsus - iub + 50 ± 5 nsec."
IC2203
2 Adjust the pulse width (Tsus - Dg) of the SUS-D
input signal so that it becomes "Tsus-D ± 5 nsec."
IC2104
PDP-4280HD
3
4
TP1118
Q1108
IGBT
Q1104
Q1109
IGBT
TP1119
TP1236
Q1205
Q1219
FET
TP1237
Q1206
Q1220
FET
TP1238
Q1207
Q1222
FET
TP2105
Q2106
IGBT
TP2106
Q2104
Q2107
IGBT
TP2107
Q2108
IGBT
TP2207
Q2204
Q2217
FET
TP2208
Q2205
Q2218
FET
TP2209
Q2206
Q2219
FET
TP2109
Q2110
Q2105
IGBT
Q2112
IGBT
TP2111
4