Power-on checks .............................................................................................

132

Tools for troubleshooting ..................................................................................................................

133

Individual component diagnostics ....................................................................................

133

LED diagnostics ..............................................................................................

133

LED indicators ................................................................................

133

Formatter heartbeat LED ................................................................

133

HP Jetdirect LEDs ..........................................................................

134

Engine diagnostics ..........................................................................................

134

Engine-test button ..........................................................................

134

Fuser test page ...............................................................................................

135

Paper-path test (and automatic sensors test) .................................................

136

Sensor test (interactive) ..................................................................................

137

A TOP (Top-of-Page) sensor ..........................................................

140

B Fuser output sensor ....................................................................

141

C Duplex sensor .............................................................................

142

D Paper width sensor 1 ..................................................................

143

E Tray 3 feed sensor ......................................................................

144

F Tray 4 feed sensor ......................................................................

145

G FD tray full sensor .......................................................................

146

H Face up detect sensor ................................................................

147

I Cartridge-door open switch ..........................................................

148

J Rear cover open sensor ..............................................................

149

K Tray 1 paper sensor ....................................................................

150

L Tray 2 paper sensor ....................................................................

151

M Tray 2 detect switch ....................................................................

152

N Tray 3 paper sensor ....................................................................

153

O Tray 3 detect switch ....................................................................

154

P Tray 4 paper sensor ....................................................................

155

Q Tray 4 detect switch ....................................................................

156

Print/stop test ..................................................................................................

157

Component tests .............................................................................................

158

Half self-test ....................................................................................

158

Drum rotation test check .................................................................

158

Diagnostics menu components test ................................................

158

Diagrams .........................................................................................................................

160

Block diagrams ................................................................................................

160

Plug/jack locations ..........................................................................................

162

Location of connectors ....................................................................................

163

ECU controller connections ............................................................

163

Locations of major components ......................................................................

165

General timing charts ......................................................................................

169

General circuit diagram ...................................................................................

170

Internal print quality test pages ........................................................................................

171

Cleaning page .................................................................................................

172

viii

ENWW