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Service Guide
15
Combination sensors and their meanings
Combinations of sensors are used by the printer to determine the type of standard
(or upper) media tray installed in the printer.
Media tray type sensing
The combinations of the three tray sensors inform the print engine what type of
media tray is installed. (The print engine does not detect the type of media
installed in the tray; it only detects the particular tray being used by the presence
of sensor flags on the side of the tray.) The tray sensors are located on the
right-side interior of the paper tray slot, mounted on I/O board right. There are
four tray types:
■
Letter (A-size).
This tray is sized for 8.5 x 11-inch (U.S.) paper as well as
low-volumes of A-size transparency film.
■
Metric Letter (A4-size).
This tray is used for 210 x 297 mm (Metric)
paper as well as low-volumes of A4-size transparency film.
■
High-volume Transparency/Label (A).
This tray supports high
volumes of U.S.-size transparency film as well as laser quality, adhesive
label stock.
■
High-volume Transparency/Label (A4).
This tray supports high
volumes of Metric-size transparency film as well as laser quality,
adhesive label stock.
Table 1 Tray switch sensor combinations
Tray type
A Paper
A4 Paper
A Transparency
A4 Transparency
Top switch
Closed
Open
Closed
Open
Middle switch
Open
Closed
Open
Closed
Bottom switc
h
Open
Open
Closed
Closed
Summary of Contents for Phaser 840
Page 46: ...36 Phaser 840 Color Printer ...
Page 95: ...Service Guide 85 Clearing PostScript NVRAM menu item ...
Page 96: ...86 Phaser 840 Color Printer ...
Page 121: ...Service Guide 111 Figure 1 Cabinet FRUs 7 5 6 8 1 2 4 0388 21 3 ...
Page 125: ...Service Guide 115 Figure 3 Paper path FRUs 0388 16 2 1 5 11 10 9 12 6 4 3 7 13 8 ...
Page 127: ...Service Guide 117 Figure 4 Motors and fans FRUs 0388 14 7 4 3 5 6 2 1 ...
Page 129: ...Service Guide 119 Figure 5 Circuit boards FRUs 4 3 5 2 1 9 7 6 8 10 11 13 0388 13 12 ...
Page 131: ...Service Guide 121 Figure 6 Solenoids and clutches FRUs 4 5 3 2 1 0388 23 ...
Page 137: ...Service Guide 127 Figure 9 High capacity PaperTray 0388 65a 1 2 ...
Page 142: ...132 Phaser 840 Color Printer ...
Page 154: ...144 Phaser 840 Color Printer ...