HP 3500 Series

ENWW Pickup/feed system 179
• M3: Drum motor
• SL1: Tray 1 (multipurpose tray) pickup solenoid
• SL2: Tray 2 (cassette) pickup solenoid
• SL4: Secondary transfer roller engaging solenoid
• CL1: Registration clutch
Feed speed control
The feed speed control changes the feed speed based on the media to prevent a fuser defect.
There are four speed settings (normal, half-speed, one-third speed and one-quarter speed). The
DC controller changes the speed according to the print mode sent from the formatter.
Table 5-6 provides types of media and the feed speeds.
The printer can detect the type of media (see Media detection on the following page).
The DC controller controls the print mode as follows according to the selected print mode, if the
selected print mode does not agree with the detected media. The types of media that the printer
can detect are plain paper, gloss paper, gloss film, and OHT (overhead transparency). The printer
can not identify envelope, thick paper, thin paper, or label. They are judged as normal paper.
• •When the selected print mode is either normal paper, envelope, thick paper, label, or auto,
the mode remains unchanged.
● When in OHT print mode: If plain paper, gloss paper, or gloss film is detected; the DC
controller judges it media mismatch. When judged as a mismatch, the DC controller sends the
error message to the formatter, cuts off the secondary transfer bias, delivers the paper, and
stops the printer engine. The DC controller lets printing process continue under the OHT mode
only when an OHT is detected. The same applies to the following pages in continuous
printing.
● When in AUTO print mode: If a plain paper, gloss paper, gloss film or OHT is detected; the
DC controller selects and switches the print mode to the appropriate one (gloss paper, gloss
film, or OHT mode) and continues printing. When auto mode is selected, the printer starts at a
Table 5-6 Print media and feed speeds
Print mode Medium type Feed speed
Normal Plain paper Normal
OHT OHT one-quarter speed
Thick 1 Thick paper half-speed
Thick 2 Thick paper half-speed
Gloss 1 Gloss paper half-speed
Gloss 2 Gloss paper one-third speed
Gloss film Gloss film one-third speed
Envelope Envelope Normal
Thin paper Thin paper Normal
Label Label half-speed
Auto Plain paper/OHT ---