HP Color LaserJet 9500 Service Manual - Page 71
face-down bins use a system of slots and lever flags that the elevator reads to indicate
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8-bin mailbox Main modules The 8-bin mailbox has 9 bins for sorting and handling printed media. The topmost bin receives the media face-up as it comes from the printer. The remaining eight bins receive the media facedown. The destination bin for the printed media depends on the device operating mode and the presence of media. The top bin in this 8-bin group can be configured as a copier bin, and used exclusively for copies from an MFP. The 8-bin mailbox has several subassemblies or mechanical parts that work together to perform the paper-handling function: ● Flipper-The flipper is the assembly at the 8-bin mailbox entry point. It receives the sheets from the printer and then delivers them to the face-up bin or flips them for deliver to the facedown bins. The flipper has a moving input paper guide that latches into the printer or MFP exit to provide a continuous paper path. ● Belt-The transport belt system is a vertical mechanism that takes the sheets that the flipper assembly flips and moves them down to the elevator head for delivery to the face-down bins. The system consists of a rubber belt and a flexible sheet-metal guide. The sheets are pressed between them for transport. ● Delivery head-The delivery-head mechanism is the most complex part in the 8-bin mailbox. It positions the elevator head in front of the bin where a sheet is to be delivered. The eject system is included in the elevator head. The eject system has two sensors in its path: one for detecting a sheet that is arriving from the belt (EXIT1) and one for detecting a sheet that is about to be ejected (EXIT2). A single stepper motor drives the sheet for ejection. Another stepper, called the slider, positions a group of rollers to feed into the bins. The rollers are not fixed, because they hit the bins when the head moves up or down. Instead, they retract when the head moves, and extend into the bins after the head stops. A single sensor indicates the position of the slider. ● Bins-The 8-bin mailbox has a total of 9 bins. The topmost bin holds media that is delivered face-up, and the lower 8 accept face-down delivery. The bins have no moving parts, but the face-down bins use a system of slots and lever flags that the elevator reads to indicate where it is positioned, the bin capacity, the presence of media, and bin-full conditions. In order for the sensors to read valid information, the bins must be correctly placed. The operation of the delivery is especially sensitive to misplaced bins. Note that the lever flag for each bin is mounted in the bin directly above it. ● Controller PCA-The controller PCA or main board is attached to the bottom of the 8-bin mailbox, with the internal wiring and harnesses routed vertically along the inside of back cover. ● Power supply-A universal power supply is activated when the printer or MFP power switch is turned on. The printer or MFP paper-handling controller sends a power-on signal to the power supply on the 8-bin mailbox through the controller PCA. The power-supply circuit provides +24 V for motors and +5 V for sensors and controller electronics. The power supply is also activated when the controller PCA is set to service mode. ENWW Chapter 5 Theory of operation 69