PIONEER PDP-428XD
Service Manual

1

2

3

4

A

SUS-B ADJUSTMENT
X DRIVE Assy
TP1118 from DIGITAL Assy XSUS-U IC1104 IC1002_A1 Pin 2 IC1101 Photo Coupler Q1109 IGBT TP1119 Q1104 Q1108 IGBT

B

1 Measure the SUS-U and SUS-B input delay time (� Tsus - iub).

2 Adjust the SUS-U and SUS-B input delay time so that it becomes "� Tsus - iub + 70 ± 5 nsec."
TP1236 Q1205

from DIGITAL Assy XSUS-B IC1001_A1 Pin 2

VR1002 IC1204 Photo Coupler

IC1209 Q1206

TP1237

Q1219 FET

TP1238 Q1207

Q1220 FET

C

Q1222 FET

Y DRIVE Assy
TP2105 Q2106 IGBT Q2104 TP2106 Q2107 IGBT TP2107 Q2108 IGBT

from DIGITAL Assy YSUS-U

IC2103 IC2001_A4 Pin 5 IC2101 Photo Coupler

D

1 Measure the SUS-U and SUS-B input delay time (� Tsus - iub).

2 Adjust the SUS-U and SUS-B input delay time so that it becomes "� Tsus - iub + 50 ± 5 nsec."
TP2207 Q2204

from DIGITAL Assy YSUS-B IC2001_A6 Pin 7

VR2002 IC2201 Photo Coupler

IC2203 Q2205

TP2208

Q2217 FET

TP2209 Q2206

Q2218 FET

Q2219 FET

E

SUS-D ADJUSTMENT
Y DRIVE Assy
1 Measure the SUS-D pulse width (Tsus - D).
TP2109 from DIGITAL Assy VR2001 IC2005_A7 Pin 8 IC2104 Q2105 Q2110 IGBT

2 Adjust the pulse width (Tsus - Dg) of the SUS-D input signal so that it becomes "Tsus-D ± 5 nsec."

F

YSUS-D

Q2112 IGBT TP2111

140
1 2

PDP-4280XA
3 4