Xerox 4050 Operator's Manual

Also see for 4050: Message guide Forms creation guide Code List Message guide Quick reference card

Contents

Xerox 4050 Operator's Manual Manual pdf 34 page image

SETTING UP PRINT JOB SOURCES5a and 5b Air bearingsTwo air bearing sensor assemblies (upper [b] and lower [a] airbearings) are used to guide the tape across the magnetichead on an air cushion and to measure air pressurereflection. The pressure signal is processed by the controlsystem, which maintains constant tape velocity and airpressure by changing the reel motor speed wheneverappropriate.6 Magnetic head assemblyThis assembly consists of a read/write head and an erasehead. The dual-gap read/write head unit is designed toperform the read/write functions in a 9-track format. It allowsa write-to-tape operation, a read-only operation, or a read-after-write operation. During a write operation, a full-widtherase head erases the tape while it moves forward before thetape passes over the write head.7 Erase head8 BOT/EOT assemblyLocated next to the magnetic head assembly, this assemblyoptically detects the beginning-of-tape (BOT) and the end-of-tape (EOT) markets. Photosensors detect light reflected fromthe BOT and EOT markers on the tape so that the tape drivecan recognize starting and stopping areas.9 Tape cleanerThe cleaner consists of two blades and a vacuum port to stripunwanted particles off the tape surface. It is designed sothat the first blade cleans the tape in the forward directionand the second cleans it in the reverse direction. Thevacuum port removes the unwanted particles from that area.10 File protect sensor (not shown)This sensor consists of a reflective ring around the file(supply) hub and a photosensor next to it that are used todetect the presence or absence of the write-enable ring onthe file reel.11 Cover interlock (not shown)There is an interlock associated with the door latch as asafety device. The tape unit can be operated only when thedoor is closed.Control panel switchesTwo types of functions are controlled by the switches on thecontrol panel: operator and maintenance. Switches to the leftof the two-digit LED display are the operator functions, andswitches to the right of the display are for maintenancefunctions. When the magnetic tape drive is online to the printer,maintenance functions do not work. Figure 3-4 shows thecontrol panel switches.3-6 XEROX 4050/4090/4450/4650 LPS OPERATOR GUIDE