HP LaserJet 1100 Service Manual - Page 176

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List of Figures Control panel 11 Printer light patterns 26 Scanner control panel 31 Basic configuration 42 Printer unit functional block diagram 43 ECU loads 44 High-voltage power supply circuit 47 Image formation block diagram 51 Simplified paper path 53 Simplified scanner document path 57 General timing diagram 59 Removing the paper guides 64 Removing the optional scanner unit 65 Opening the scanner unit 66 Removing the Contact Image Sensor (continued on next page) .67 Removing the Contact Image Sensor (continued 68 Disconnecting the CIS wire connector 69 Opening the printer door 70 Disconnecting the stabilizer bars 71 Storing the stabilizer bars 72 Removing the paper deflector 73 Removing the door from the hinge mechanism (continued on next page) 74 Removing the cover from the hinge mechanism (continued) . . . .75 Removing the stabilizing pods 76 Removing the screws on the back cover 77 Removing the back cover 78 Removing the paper guide 79 Removing the front cover (continued on next page 80 Removing the front cover (continued 81 Stabilizer bars 82 Removing the printer laser/scanner cover 83 Disconnecting the scanner assembly cables 84 Releasing the output roller (continued on next page 85 Releasing the output roller snaps 86 Removing the torsion screws on the delivery assembly 87 Removing the delivery assembly 88 Paper Exit Sensor Flag 89 Metal Clips Holding Fusing Element 90 Reassembly of fusing element clips 91 Releasing the fusing element cable connection, left side 92 Releasing the fusing element cable connection, right side . . . . .93 Removing the fusing element 94 Removing the motor cable connection to the gear train cover . . .95 Removing the gear train cover 96 Removing the gear train motor 97 Removing the solenoid 98 Removing the pressure roller (continued on next page 99 Removing the pressure roller 100 Changing the pickup roller 102 Accessing the paper pick-up assembly area 103 Removing the paper pick-up assembly cover 104 C4224-90962 183

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C4224-90962
183
List of Figures
Control panel
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Printer light patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Scanner control panel
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Basic configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Printer unit functional block diagram
. . . . . . . . . . . . . . . . . . . . . .43
ECU loads
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
High-voltage power supply circuit
. . . . . . . . . . . . . . . . . . . . . . . .47
Image formation block diagram
. . . . . . . . . . . . . . . . . . . . . . . . . .51
Simplified paper path
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Simplified scanner document path . . . . . . . . . . . . . . . . . . . . . . . .57
General timing diagram
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Removing the paper guides . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Removing the optional scanner unit . . . . . . . . . . . . . . . . . . . . . . .65
Opening the scanner unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
Removing the Contact Image Sensor (continued on next page)
.67
Removing the Contact Image Sensor (continued) . . . . . . . . . . . .68
Disconnecting the CIS wire connector . . . . . . . . . . . . . . . . . . . . .69
Opening the printer door
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
Disconnecting the stabilizer bars
. . . . . . . . . . . . . . . . . . . . . . . . .71
Storing the stabilizer bars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
Removing the paper deflector
. . . . . . . . . . . . . . . . . . . . . . . . . . .73
Removing the door from the hinge mechanism (continued on next page) 74
Removing the cover from the hinge mechanism (continued) . . . .75
Removing the stabilizing pods
. . . . . . . . . . . . . . . . . . . . . . . . . . .76
Removing the screws on the back cover
. . . . . . . . . . . . . . . . . . .77
Removing the back cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
Removing the paper guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Removing the front cover (continued on next page)
. . . . . . . . . .80
Removing the front cover (continued)
. . . . . . . . . . . . . . . . . . . . .81
Stabilizer bars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
Removing the printer laser/scanner cover
. . . . . . . . . . . . . . . . . .83
Disconnecting the scanner assembly cables . . . . . . . . . . . . . . . .84
Releasing the output roller (continued on next page) . . . . . . . . . .85
Releasing the output roller snaps . . . . . . . . . . . . . . . . . . . . . . . . .86
Removing the torsion screws on the delivery assembly . . . . . . . .87
Removing the delivery assembly
. . . . . . . . . . . . . . . . . . . . . . . . .88
Paper Exit Sensor Flag
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
Metal Clips Holding Fusing Element
. . . . . . . . . . . . . . . . . . . . . .90
Reassembly of fusing element clips . . . . . . . . . . . . . . . . . . . . . . .91
Releasing the fusing element cable connection, left side . . . . . . .92
Releasing the fusing element cable connection, right side
. . . . .93
Removing the fusing element . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
Removing the motor cable connection to the gear train cover . . .95
Removing the gear train cover . . . . . . . . . . . . . . . . . . . . . . . . . . .96
Removing the gear train motor . . . . . . . . . . . . . . . . . . . . . . . . . . .97
Removing the solenoid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98
Removing the pressure roller (continued on next page) . . . . . . .99
Removing the pressure roller . . . . . . . . . . . . . . . . . . . . . . . . . . .100
Changing the pickup roller
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .102
Accessing the paper pick-up assembly area
. . . . . . . . . . . . . . .103
Removing the paper pick-up assembly cover
. . . . . . . . . . . . . .104