EXP Computer C4077-90960 - Manual (Page 111)

2000-Sheet Input Unit Operation
All communication and control of the 2000-Sheet Input Unit (and the
Multi-Bin Mailbox/Mailbox With Stapler) is through the External Paper
Handling (EPH) PCA mounted on the Formatter Assembly. These
instructions are sent to the 2000-Sheet Input Unit controller PCA located
behind the back cover. The main components of the 2000 Sheet Input Unit
and their functions are listed in Table 5-2. Power is provided to the
2000-Sheet Input Unit by an internal power supply located behind the back
cover.
When the Tray 4 paper tray has been loaded and closed, the paper stack is
lifted into position (sensed by PS34) under the pickup, feed and separation
rollers. If PS34 is not activated within a predetermined time, a 66.x.yy
DEVICE ERROR message will appear on the printer control panel display.
Presence of paper in the tray is detected by PS33. Switches SW601 and SW602
detect the amount of paper remaining in the tray (refer to Table 5-3. Switches
SW701-704 perform two functions: they sense the size of paper installed in the
tray (refer to Table 5-4, and they determine that the paper tray is properly closed.
When the printer calls for paper from Tray 4, the Pickup, Feed, and Separation
rollers rotate to pick up and feed one sheet to the registration roller in the
Transfer Assembly. The controller PCA monitors the timing of sensors PS31
and PS32 to determine that paper is moving normally. If a jam occurs, a 13.x
PAPER JAM message will appear on the control panel display.
Switch SW31 is a safety device to prevent breakage of the paper lifting
mechanism due to improper or excessive paper loading.
SW601 SW602 Remaining Paper
ON ON 100%
OFF ON 75%
OFF OFF 50%
ON OFF 25%
Table 5-3 2000-Sheet Input Unit Paper Quantity Switches
5-26 Functional Overview