HP LaserJet 4100 Manuel de service télécharger pdf (Page 122)

120 Theory of operation EN

Clutches and sensors

See chapter 7 for locations of switches, sensors, and clutches.

Printing from tray 1

The presence of paper in tray 1 is detected by the tray 1 paper sensor (PS105).

When the engine controller board receives the /PRNT signal from the formatter, the printer starts the

initial rotation phase. (This consists of main motor warm-up, scanner motor warm-up, high-voltage

control sequence and fuser warm-up.) When the initial rotation phase ends, the tray 1 pickup

solenoid (SL102) is activated.

The cam rotates, the paper tray lifter rises, and the media comes in contact with the tray 1 pickup

roller. At the same time, the tray 1 pickup roller rotates twice and a sheet of media in tray 1 is picked

up. The lifter plate prevents unnecessary sheets from feeding with the first sheet.

The sheet then reaches the registration assembly, where its skew is corrected. Then it goes through

transfer, separation, and fusing stages; passes through the delivery unit; and is delivered to the

output bin.

Note If paper is removed from tray 1 just before it is picked, the tray 1 pickup roller might continue to rotate

up to six times and a jam will be detected.

Figure 30. Tray 1 pickup timing

1 2 ... 117 118 119 120 121 122 123 124 125 126 127 ... 335 336

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HP LaserJet 4100 Manuel de service Page 122