Remove the USB PCA

96

Duplex-reverse drive assembly

97

Remove the duplex-reverse drive assembly

97

Fuser

100

Remove the fuser

101

Reinstall the fuser

106

Paper-delivery assembly

107

Remove the paper-delivery assembly

107

Tray cassettes and optional Tray 3 assembly

110

2 Solve problems

111

Solve problems checklist

112

Menu map

113

Troubleshooting process

114

Pretroubleshooting checklist

114

Power-on checks

115

Troubleshooting tools

116

Component diagnostics

116

LED diagnostics

116

Network LEDs (network models only)

116

Control panel LEDs

116

Memory card LED (memory-card models only)

116

Component tests

117

Control-panel tests

117

Diagrams

118

Plug/jack locations

118

Location of connectors

119

DC controller PCA

119

Location of major components

121

Major components

121

Motors and fans

123

Rollers

124

PCAs

125

Optional 250-sheet cassette

126

General timing diagram

127

General circuit diagram

128

CPU/ASIC diagrams

129

HVT/Toner EMP diagram

131

Driver PCA diagram

132

Duplexer PCA diagram

133

FSR diagram

134

ENWW

vii

Page 9
Image 9
HP 400 manual Solve problems 111