HP Color LaserJet CM4730 Service Manual - Page 218
Fusing and delivery block, OHT mode, Automatic mode, All other print modes
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Table 4-7 Paper size detection switch settings (continued) Print mode Media type Thin Plain paper Thin rough Rough paper Envelope Envelope Label Label Thick 1 Thick card/postcard Thick 2 Thick paper Gloss 1 Gloss paper Gloss 2 and 3 Gloss paper Overhead transparency OHT film Gloss film Gloss film Automatic Plain paper, thin paper, thick paper, gloss paper, gloss film, overhead transparency Feed speed Normal speed 1/2 speed 1/2 speed 1/2 speed 1/2 speed 1/3 speed 1/2 speed 1/3 speed 1/3 speed 1/3 speed N/A The DC controller performs the following controls depending on the specified print mode. ● OHT mode. If plain paper, other than OHT is detected, the DC controller determines a media misprint. The DC controller lets the printing operation continue under the OHT mode only when it detects the OHT. The same applies to the following sheets in a continuous printing. When the DC controller outputs the wrong media, it notifies the formatter, cuts off the secondary transfer bias, delivers the media, and then stops the printer engine. ● Automatic mode. When automatic mode is selected, the MFP starts the printing operation in the normal mode. If plain paper, thin paper, thick paper, gloss paper, gloss film, or OHT is detected, the DC controller switches the print mode to the appropriate mode and executes the printing operation. In continuous printing, the print mode will not change from the one selected for the first sheet. However, if the DC controller detects media different from the first page, it outputs a media misprint. ● All other print modes. If media other than OHT is detected, the DC controller continues the printing operation with the selected print mode. It outputs a media misprint only when it detects OHT. The same applies to the following sheets in the continuous printing. Fusing and delivery block The fuser/delivery unit is structured with two blocks. One is the fuser block that fuses toner on the media. The other is the delivery block, which delivers the fused media to the face-down tray or output device. The following is the operational sequence of the fuser/delivery unit. 1. The media with toner transferred on the ETB is fed to the fuser. 2. The paper warp is adjusted with the fuser motor speed control. The feeding speed differs between the ETB and the fuser, as different motors are used to drive them. This control keeps the media with a specified warp to prevent image defects and media transport defects. 198 Chapter 4 Theory of operation ENWW