Xerox B8090 Service Manual

Machine Overview........................................................................................................... 8-3

Power.............................................................................................................................. 8-5

User Interface..................................................................................................................8-10

Machine Run Control ...................................................................................................... 8-12

Single Pass Document Handler (SPDH)......................................................................... 8-18

Fusing and Copy Transportation..................................................................................... 8-33

Low Capacity Stapler Stacker (2K LCSS)....................................................................... 8-47

LVF BM ........................................................................................................................... 8-56

High Volume Finisher (HVF)........................................................................................... 8-75

Fax .................................................................................................................................. 8-98

Main Drive Module .......................................................................................................... 8-98

Scanner Module.............................................................................................................. 8-102

LED Print Head (LPH)..................................................................................................... 8-108

Paper Supply................................................................................................................... 8-111

Paper Transportation and Registration ........................................................................... 8-136

Xerographics................................................................................................................... 8-140

8 Principles of Operation

Launch Issue
Xerox® AltaLink® B8090 Family Multifunction Printe r

April 2017

8-1

Principles of Operation

Principles of Operation

April 2017

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Launch Issue

Xerox® AltaLink® B8090 Family Multifunction Printer

Machine Overview

Configuration Options

The Xerox® AltaLink® B8090 Family is available as a basic machine with trays 1, 2, 3, 4 and 5
(bypass tray) plus an optional tray 6 (external paper feede r platform - PFP). Five machine
speeds are available in two variants.

First machine variant:

• AltaLink® B8045 - 45 ppm

• AltaLink® B8055 - 55 ppm
Second machine variant:

• AltaLink® B8065 - 65 ppm

• AltaLink® B8075 - 75 ppm

• AltaLink® B8090 - 90 ppm
Refer to Overview within the Main Drive Module section for details of the two variants and how

the speeds are achieved.

General

For the space requirements, environment range and the print out time. Refer to:

• GP 21 Installation Space Requirements.

• GP 23 Environmental Data.

• GP 25 First Copy / Print Out Time and Power On / Off Time.

Paper Supply and Paper Handling Options

• 200 sheet single pass document handler (SPDH).

• Two 500 sheet paper trays (designated tray 1 and tray 2).

• 3600 sheet high capacity feeder (designated trays 3 and 4).

• 100 sheet bypass tray (designated tray 5).

• Optional 3300 sheet high capacity feeder (designated tray 6).

Output Options

• A horizontal transport is also installed when a finisher is fitted.

• Office finisher (2K LCSS). See 2K LCSS General Description.

• Office finisher with booklet maker (LVF BM). See LVF BM General Description.

• High volume finisher (HVF). See HVF General Description.

• High volume finisher with booklet maker (HVF BM). See Booklet Maker Module.

• Post print inserter (PPI) used with an HVF BM. See Tray 7 Inserter .

• Tri-folder used with an HVF and HVF BM. See Tri-Folder.

Table 1 describes finisher and paper handling options for each speed variant.

Table 1 Paper handling and finisher options

Tray 6
(PFP)

45ppm Yes Centre tray or horizontal transport Yes Yes No
55ppm Yes Centre tray or horizontal transport Yes Yes No
65ppm Yes Centre tray or horizontal transport Yes Yes Yes
75ppm Yes Centre tray or horizontal transport Yes Yes Yes
90ppm Yes Horizontal transport only No No Yes

Centre tray or horizontal
transport

2K LCSS LVF BM

HVF BM Tri
folder/ PPI

NOTE: If an incompatible fin isher is installed the s tatus line will displa y Status Code 12.765
Incompatible/unknown finisher detec ted .

Registration

The AltaLink® B8090F are centre registered multifunction printers as follows:

• Side 1 scanning:
– Centre registered document guides are used when the document is scanned

through the single pass document handler.

– Edge registered when the document is manually placed on the platen glass.

• Side 2 scanning - centr e registered document guides ar e used when the document is
scanned through the single pass document handler.

• All paper trays use centre registered paper guides.

• The paper is not actively registered along the paper path.

•2K LCSS:
– Stacking - centred by tampers
– Stapling - centred by tampers
– Hole punching - no active registration

• LVF BM:
– Stacking - centred by tampers
– Stapling - centred by tampers
– Hole punching - no active registration
– Booklet making - centred by tampers

•HVF BM:
– Stacking - centred by tampers
– Stapling - centred by tampers
– Hole punching - centred by activ e re gistrat ion. A s ensor d etects th e to p edge of the

paper. The control board co mmands a motor to move the punch into the d esired
position.

– Booklet making - centred by tampers

Accessories and Kits

• Workshelf.

• 50 sheet convenience stapler.

• 2 hole punch kit.

• Legal 2 hole punch kit.

• 3 hole punch kit.

• 4 hole punch kit.

• Swedish 4 hole punch kit.

• 1 Line Fax kit.

• 2 Line Fax kit.

• Scan to PC desktop SE - standard.

• Scan to PC desktop SE - professional.

• Nationalization kits.

• Foreign device interface kit.

• Tray 2/4 lock kit.

• Envelope tray feed kit.

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April 2017

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Principles of Operation

• Unicode international printing kit.

• Secure access kit.

• Common access card.

• McAfee Integrity Control enablement kit.

• XPS enablement kit.

• Wireless print kit.

• Smartcard kit.

• User interface external keyboard.

Consumables and Billing

There are three types of consumables:

• Print cartridge

• Toner cartridge

• Fuser
for full details of consumables refer to GP 39. For full details of billing and service plans refer to

GP 9.

Machine Identificatio n

• Figure 1 AltaLink® B8075 with centre output tray and workshelf.

• Figure 2 AltaLink® B8055 with 2K LCSS.

• Figure 3 AltaLink® B8065/B8075 with LVF BM.

• Figure 4 AltaLink® B8090 with tray 6, HVF BM, inserter and tri folder.

Figure 2 Machine with 2K LCSS

Figure 1 With centre output tray and workshelf

Principles of Operation

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Figure 3 Machine with LVF BM

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Xerox® AltaLink® B8090 Family Multifunction Printer

Figure 4 With tray 6, HVF BM, tray 7, tri-folder

Power

Power Generation and Distribution

System Operating Modes

In order to comply with the environmental agency requirements the system must have different
power states called o perating modes. Each mode has different levels of power consumption
and system functionality. See also GP 22 Electrical Power Requirements.

Plug-in/Off Mode

This is not an operati ng mode. P lug in/off i s the condi tion of the machine when power is con­nected but the machine is powered down. When the power butt on is pressed to shut down
(and confirmed) this is the condition of the machine.

This is the lowest power state that the mac hi ne c an ent er. On ly the LV PS and po wer man age­ment circuitry on the SBC is active.

The only method that can be used to power the machine on, in this mod e, is to press the UI
power button.

Standby/Ready Mode

Also referred to as Level 1 power (Blue Angel RAL-UZ 171 specifications).

This is the n o rma l op er at i ng co nd i ti o n of th e m ac hi n e wh en it is r ea dy fo r wa lk-up copying . Th e
UI is active and illuminated in this mode. This is the cond ition of the machine wh ile a user is
programming a job via the UI or performing any other UI activity.

In this mode the system is ready to print/copy/fax with little or no delay in hard copy output. The
system has full fun ctionality when in this mode, is capable of meeting FCO T (first copy out
time) and FPOT (first print out time) requirements when in this mode only.

Launch Issue
Xerox® AltaLink® B8090 Family Multifunction Printe r

Run Mode

This is the condition of the machin e when it is acti vely print ing a job. The machine enters this
mode when a user selec ts the final command to run a co py jo b. T he mac hi ne ente rs th is st ate
when it executes a print job via the network.

In this mode the system is in the pr ocess of marking images and/or collating in an output
device.

Sleep States

NOTE: The user will not be able to tell the di fference semi conscious state and deep sle ep
state. Visually the machine appears the same.

Semi Conscious Mode

The machine enters semi conscious mode after a period of inactivity after the most recent print
job or copy job. In semi-co ns cious mo de th e UI is i nactiv e a nd th e power button is illuminated.
The delay time is preset but is adjustable by the customer in the range 0 to 30 minutes.

Semi conscious mode allows the system to perform the following limited functions:

• Access to the remote control panel via the web UI.

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Principles of Operation

• Wireless printing (if installed)

• All non print related network requ ests (including HDD a ccess), such as access from the
web UI.

NOTE: If Wake on USB is enabled the sys tem remai ns in semi conscious mode and does not
enter deep sleep mode.

Deep Sleep Mode

Also referred to as S3 power (Blue Angel RAL-UZ 171 specifications).

Recovery from this mod e to standby/read y is from either pressing the UI powe r button or an
incoming fax and or print job. The machine does not wake from sleep mode upon insertion of a
USB drive.

• Only standby power is available. SBC network control, power management.

• The system is able to wake up for network printing or incoming fax (if installed).

• The system is able to wake up when the user presses the UI power button.

• The system will be ‘rea dy to scan’ from any wak e up event i n less than 1 5 seconds w ith
UI available within 1 second.

Auto Power Off

Enables the system to switch off aft er a specified time in deep sleep mode via an adjustab le
timeout that is acc essed using tools or in the Web UI. The default is ‘disabled’. Once the
machine has switched o ff it can be switched on via the po wer switch on the UI. When the
machine has powered down auto matically it is in the same stat e as it would be after fir st con
necting mains power.

Operating Mode Transitions

Warm Up

In this condition the system is booting up from plug in/off mode or recovering from sleep mode.
The system will be ‘ready to scan’ with in 135 seconds from power up. Product perfor mance
specification warm up times quoted are from ‘pow er save’ to ‘system ready’ (ac ceptance of
scan, print or fax input) . Fus er war m up ti me wi ll v ar y de pen ding on li ne v ol tage , amb ie nt tem
perature and time since machine was last switched on, etc.

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Figure 1 shows the system operating modes and the associated transitions from mode to

mode that are required to ensure the s ystem meets all envir onmental a gency energy require
ments.

Principles of Operation

April 2017

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Figure 1 Operating mode state transition diagram

Launch Issue

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Xerox® AltaLink® B8090 Family Multifunction Printer

LVPS Functions

The LVPS is split into the following main functions:

• Provides a +5V stand-b y supply to the powe r management c ontrol circuitry on th e SBC
PWB. In plug-in off mode thi s consumes le ss than 0.5W AC to enable m onitoring for the
power button.

• Switches on and off AC power to the output device outlet, and +5V and +24V main as
directed by the SBC PWB.

• Provides +5V and +24V to power the SBC PWB in ready, and run modes.

• Provides main +5V interlocked power to the IOT PWB during normal operation.

• Provides main +24V non-interlocked power to the IOT PWB during normal operation.

• Provides power to the fuser using a combination of cycle switching and phase control pat­terns. Firmware within the LVPS us es look up ta bles based on power demand ed by the
IOT software and the line voltage detected at the LVPS input.

There are two types of LVPS (PL 1.10 Item 1):

• A single 12 amp LVPS is used for the A ltaLin k® B8045/B 8055 1 10V or 23 0V and for the
AltaLink® B8065/B8075/B8090 230V.

• A 16 amp LVPS is used for the A ltaLink ® B806 5/B807 5/B809 0 110V. T his LV PS h as an
IEC320 C20 type mains connector.

Control Lines and Operating Modes

This section describe s the co ntrol line s between the SBC PW B, IOT P WB and LV PS used to
control the operating modes by the switching of AC and DC supplies in the system.

Interlock Switches

When the interlock sw i tches ar e clos ed an d th e I OT C Fail s ig nal is lo w, th e L VP S ena ble s the
+24V INTLK, and enables fuser power.

The front door interlock sw itch, S01 -300, and the le ft door interl ock switch , S01-305, are con­nected in series to the LVPS.

IOT-LVPS Interface Hotlines

POWER_FAIL

The IOTC_Fail signal is an early warning of an imminent loss of AC power.

LVPS to IOT Comms Line

The LVPS communicates with the IOT to signal power availability.

SBC-LVPS interface hotlines

PS_ON

When this signal is e nabled (low), the LVPS enables main +5V, +24V and +24 Interlocked
power.

Entering/Exiting Power Modes

From Plug In/Off Mode

+5VSB power is act ive during all modes as soon as the mach ine is plugged in to a powered
wall socket to monitor the UI power button.

From plug in/off mode to ready: User presses the UI power button which cause s the power
management circuitry on the SBC PWB to enable th e PS_ON signal to switch on the main
LVPS outputs. The system can then boot up and perform initialisation and the warm up
sequence.

From Ready (Ready to Scan) Mode:

All power supply outputs are ‘on’ in this mode. A user pressing the UI power button invokes the
pop-up: ‘power down option s, quick restart, enter power saver m ode or power off’ selection
screen on the UI.

From ready (ready to scan) mo de to pl ug-in off m ode: If “ powe r down” is s elec ted, a fter c onfi r­mation from all modules is ac cepted, the SBC PW B disables the P S_ON hotline. This in turn,
removes all AC and DC outpu ts, except +5VSB. An additional met hod to achieve this is to
keep the power button pressed for 5 seconds which overrides software.

From ready (ready to scan) mode to sleep mode: If “enter sleep mode” is selected, after confir­mation from all modules is accepted , the PS_ON signal is disabled whic h removes the main
DC outputs from the LVPS as well as AC power to the finisher. +5VSB remains on in this
mode.

From ready (ready to scan) mode to quick restart: If quick restart is selected, the SB C PWB
and IOT PWB perfor m soft resets and re-initi alize the system as per s witch on from plug in
mode.

From Deep Sleep Mode or Semi Conscious Mode:

+5VSB output is activ e in thi s mod e. Only th e S B C P WB , f ax mo dule a nd the UI power button
are active in this mode.

From sleep mode to s tand-by mode via wake up from incoming print job: T he SBC PWB is
capable of waking the system from sleep m ode on receipt of any i ncoming job that re quires
marking. The SBC PWB enables the PS_ON signal, which enables all main power.

From sleep mode to stand-by mode via wake up from incoming fax job: The fax modu le is
capable of waking the system from slee p mode on receipt of an incoming job that requires
marking. The PME signal is used to ind icate to the SB C PWB that the wake up call ha s been
initiated. The SBC PWB enables the PS_ON signal, which enables all main power.

From sleep mode to stand-by mode via wake up from user intervention at UI: The UI is capable
of waking the system from sleep mode by pressing the power button. The On Off Button signal
is detected by the SBC PWB, which enables the PS_ON signal, which enables all main power.

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Xerox® AltaLink® B8090 Family Multifunction Printe r

April 2017

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Principles of Operation

DC Power Distribution

Table 1 below shows how the power is distri buted from the LVPS to the rest of the su b-sys-

tems (excluding the AC distribution to the finisher and the fuser).

Table 1 LVPS DC power distribution

+24V

+24V

Module Description +5VSB +5V

Image output terminal controller (IOTC) yes yes yes
Single board controller (SBC) yes yes yes
Drives module yes

Other voltages are generate d and d is tribu ted by the SBC and IOT PWBs . Refe r to Tabl e 2 and

Table 3.

Table 2 SBC DC power distribution

Module Description +3.3V +5V +12V +24V

Fax module yes yes
LED Print head (LPH) yes
Scanner module yes yes yes yes
User interface (UI) yes
Hard disk drive (HDD) yes

Table 3 IOT PWB DC power distribution

Module Description +3.3V +5V

High voltage power supply (HVPS) yes
Paper feed module (PFM), tray 1 and 2 yes yes
High capacity feeder (HCF), tray 3 and tray 4 yes yes
Tray 6 yes yes
HCF transport motor yes
Left door yes yes
Tray 5 (bypass tray) yes
Bypass tray clutch yes
Horizontal transport yes yes
Drives Module yes

INTLK

+24V
INTLK

non
INTLK

+24V
non
INTLK

System Power On/Off Times

Refer to Table 4.

Table 4 System power on/off times

Power on

Power Timings

Power LED on UI flashes <2s N/A <41s N/A
First UI screen displayed N/A <4.5s N/A N/A
Services Home Screen

displayed
Ready to Scan (Fax, File

or E-mail send)
Ready to Scan (Cop y) (3) <135s (1) <15s (2) <176s (1) N/A
Ready to Mark <160s (1) <28s <201s (1) N/A
Power Off N/A N/A N/A <36s
Blue Angel recovery time

(45ppm) (4)

NOTE:

1. The time taken for a machine to power on, is dependent o n the numbe r and type of s er­vices enabled on the de vice b eing evaluated . Th e val ues sho wn in the tabl e ass ume the
basic configuratio n as shipped from the facto ry. i.e. Copy; Print From; ID Copy; Serve r
Fax:. Additionally, automatic data integrity routines that can occur randomly after 20
power on events from a software alt -boot, can add up to 90 seconds to these ti mes.
Therefore measurement of power on times needs to be done shortly after an Alt-boot.

2. Recovery from sleep is dependent on which of two sleep modes the machine has
entered. Recovery from sleep can be considerably faster than the time shown .

3. Ready to Copy is indicated by the message “Ready to Scan” being displayed on the GUI.

4. Tested as per Blue Ange l RAL UZ-171 on 45ppm only. Higher speed machines have
higher limits hence this is critical path.

from off

<120s (1) <15s <161s (1) N/A

<135s (1) <15s (2) <176s (1) N/A

N/A <25.58s(4) N/A N/A

Sleep Recovery
(touch power
button)

Ready from
Restart

Power off from
Ready

Principles of Operation

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Xerox® AltaLink® B8090 Family Multifunction Printer

High Voltage Power Supply

The high voltage power supply generates the voltages used by the xerographics system.

The IOT PWB supplies 24V to the HVPS.

The IOT PWB sends the following control signals to the HVPS. Refer to Table 5.

Table 5 HVPS control signals

Signal Description

BCR AC PWM Pulse-width-modulation control line for activation and setting of the BCR AC

BCR DC PWM Pulse-width-modulation control line for activation and setting of the BCR DC

BCR CLOCK Control line for BCR frequency. Typical 1.6 kHz.
DB AC PWM Pulse-width-modulation control line for activation and setting of the DB AC

DB DC PWM Pulse-width-modulation control line for activation and setting of the DB DC

DB CLOCK Contr ol lin e for DB fre que ncy. Typi c al 9 kHz.
BTR CC PWM Pulse-width-modulation control line for activation and setting of the BTR pos-

BTR MODE Control line which disables the BTR constant current mode, and then

DTS ON Control line which enables the DTS negative voltage source.

The HVPS returns a BTR MON signa l to the IOT PW B . The vo lta ge is scal ed ac cor di ng to this
formula: BTR MON = 2.5 + (0.00045 x BTR Voltage). For example, BTR MON = 2.5 when BTR
voltage = 0.

current source.

voltage source.

current source.

voltage source.

itive current source.

enables the BTR negative constant voltage mode.

Based on the inputs, the HVPS supplies the following to the xerographics system:

• BCR (Bias Charge Roll) is the sum of the BCR AC and BCR DC sources.

• DB (Developer Bias) is the sum of the DB AC and DB DC sources.

• BTR (Bias Transfer Roll) is either the BTR CC or BTR CV source, depending on the state
of the BTR MODE input. Both sources are DC.

• DTS (DeTack Saw) is simply the DTS negative voltage source.

Launch Issue
Xerox® AltaLink® B8090 Family Multifunction Printe r

April 2017

Principles of Operation

8-9

User Interface

The UI module is ma de of four assemblies, the LCD module, the contr ol PWB, the emotive
LED PWB and the status/LED PWB, PL 2.10.

The UI includes the following features.

• A 10.1" LCD display and capacitive multi touch LCD screen.

• Emotive LED bar, an array of LED's for machine status indication.

• Machine power ON/OFF control with wh ite LED backlight for power sav er mode indica­tion.

• Audio speaker.

• Near field communication (NFC) module.

The UI consists of 5 components, Figure 1.

1. LCD module (within the UI module).

2. UI control PWB (within the UI module).

3. UI status PWB (within the UI module).

4. UI emotive LED PWB (within the UI module).

5. UI interface PWB (mounted within machi ne frame) .

6. External keyboard (accessory).

Only the following components are accessible:

• UI module, PL 2.10 Item 1.

• UI interface PWB, PL 2.10 Item 15.

Principles of Operation

Figure 1 User interface components

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Xerox® AltaLink® B8090 Family Multifunction Printer

LCD Module

The LCD module comprises,

• a color TFT screen (Thin Film Transistor),

• embedded backlight,

• capacitive touch panel.

The cables are wired directl y into the LCD mod ule. All the LCD mo dule cable s connect to the
UI control PWB. PJ numbers are detailed on the UI control PWB.

Display video input for the TFT display is provided from the control PWB; four Pairs of LVDS
display data and one p ai r of c lo ck fr om the PS 862 2 de vice whi ch c onv erts di splay p or t da ta to
required LVDS data which is driven to the TFT display through buffer FIN1108.

UI Control PWB

The control board is the main board in the UI assembly which supplies power and the required
ON/OFF sequence for the TFT LCD module. Microcontroller MSP43 0F5510 provides PWM
drive for the emotive LED and au dio, required control signal s for power sequencing and I2C
bus for EEPROM access which stores EDID data. An RS-422 interface is used for communica
tion to the SBC.

The UI module provides an audi tory response that indicates machi ne statuses such as fault
conditions, authentica tio n, powe r s aver en try/e xi t a nd tou ch ton es. T h e UI c ont rol PWB stores
all the audio files and includes a speaker on the board for the audio output.

UI Emotive LED PWB

The emotive LED PWB contains 4 blue LE Ds and 4 amber LED s. The emo tiv e PW B also con ­tains the required biasing resistor and the mai n drive circu it is loca ted in the con tr ol PW B.

• PJ915 connects to the UI control PWB.

UI Interface PWB

The UI interface PWB, PL 2.10 Item 15, connects the UI control PWB to the rest of the
machine.

• PJ920 connects to the SBC PWB.

• PJ921 connects to the SBC PWB.

External Interface connectors/signal details

The SBC interface to th e main control PWB is via the UI interface board through an RJ150
connector for video and an 18 way DF11 connector for control and power signals. The connec

­tor into the UI module from the UI interface board is via a 40 way FFC connector.

Grounding scheme

There is a common single digital ground. All the return c urrent is passed to the SBC via the
interface connector. There is no chassis ground for the UI module as it as made of plastic.

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Connections on the UI control PWB

• PJ900 to the LCD module - 1024 x 600 color TFT

• PJ901 to the LCD module - capacitive touch panel

• PJ902 to the UI interface PWB

• PJ903 to the UI emotive LED PWB

• PJ904 to the UI status PWB

• PJ906 to the LCD module - LED backlight

UI Status/Keyboard PWB

The Status/keyboard PWB contains the machine power button and the home button.

• The power ON/OFF but ton is for system power ON/OFF an d features an array of white
LEDs as a back light driven direc tly from the SBC PWM signal. This LED is for pow er
saver indic ation.

• The Home button returns the syste m to the ho me screen. This signal i s mapped directly
to the SBC GPIO.

The UI module is provided with an NFC (near field communication) tag to enable printing func­tionality through NFC. The NFC antenn a and chi p are mo unte d on the UI sta tus PW B. A wh ite
light LED on the UI status PWB illuminates when the NFC is active.

NFC provides the RF interfa ce for contactless communic ation with an external read er/writer,
serial interface for contact communication with an external host, control logic for command pro
cessing and various con trols. It also consists of access restr iction of RF communication by
password. Supply voltage provided is 3.3 V.

• PJ910 connects to the UI control PWB.

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Xerox® AltaLink® B8090 Family Multifunction Printe r

April 2017

External keyboard (accessory)

A slide out keyboa rd, c on nec ted to a U SB po rt, c an be mou nted be neath the main UI modul e.
This keyboard can be used as an alternative to the touchscreen keyboard. (PL 2.10 Item 14)

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Principles of Operation

8-11

Machine Run Control

e

Overview

The Single Board Controller (SBC) PWB interfaces with the Image Output Terminal (IOT)
PWB, scanner, netw ork, fax, and the UI. Control of the subsystems is de legated to the IOT
PWB, or the PWBs within the subsystem, while the SBC maintains system level control.

SBC Module Overview

The SBC module has different configuration options. When option al configurations are not
used, blanking plates are needed.

Backup battery

LED print
head

The SBC PWB supports existing optional PWB interfaces such as FDI, Common Interface Fax
(CIF) and PWS.

Refer to PL 3.22. The SBC PWB is contained in a c ha ss is. T h e S BC PW B c has sis c onsis ts of
a metal cage, interior bracke t, and top cover. The module co ntains the SBC PWB , HDD, and
optionally, the fax module and FDI PW B , alon g with mec hanic al pa rts and harnesses. Refer to

Figure 1 and Figure 2.

HDD

Fax PWB SBC PWB

Ethernet port

USB host

USB device

IIT power

SIM card slot

SBC Performance

The image path for this color s cann er brin gs the sc anner v ideo d irectly t o the S oftware Ima ge
Path (SWIP).

The SWIP is used as the main video controller for the high speed digital printer and multi func­tion digital copier color applications. The device is controlled through a 32 bit, 66 MHz host PCI
bus. The Calypso SWIP scan im age processing (with JPEG), print image proces sing, image
data compression/decompression capability, rotation and merge engines, input data inter
faces, and image outp ut capab ility. I mage data may be sto red in either EPC or system mem­ory.

SD card

Figure 2 SBC PWB

IIT video

User interfac

User Interface
power

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Principles of Operation

Figure 1 SBC PWB module

The SBC PWB also contains a USB dev ice (singl e) and U SB host ( single and dual) por ts, as
well as a three-speed (10/100/1000) Ethernet port, a debug port, a SIM port to configure
machine speed and a For ei gn Devic e Int erfac e. T h e FD I P WB requi r es th e u se o f a s ep arate
cable from the bulkhead to the actual FDI PWB.

Backup Battery

The backup battery is used to suppl y power to the real- time c lo ck and the powe r mana gem ent
circuitry when the machine is not plugged in.

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Xerox® AltaLink® B8090 Family Multifunction Printer

Launch Issue

SBC PWB Interfaces

The SBC PWB interfaces with:

• IOT PWB (including hotlines)

• User interface

• Image input terminal

• LED print head

• Portable workstation

•Network

•Fax

• External debug communication port.

The SBC PWB has provisions for the plug in items listed in Table 1.

Table 1 Plug in items

Standard Configurat ion Optional Configuration

SD Memory Card FDI
HDD Common Interface Fax
SIM Card

UI Interface

• The RS-422 (TX and RX only) at a baud rate of 480K.

• A USB host is connected to the SBC PWB USB port through an on-board connector.

• The SBC PWB provides +3.3V DC and +12V DC power to the UI.

• The SBC PWB is capable of waking up from the UI Wake up switch (Wake UP switch sig­nal).

• The interface supports a low vol tage differential signal (LVDS) output to drive a color
LCD.

image Input T erminal

• The SBC PWB supplies +3.3V, +5V, +12V, and +24V DC to the scanner.

• The RS422 (RX and TX Only) at a baud rate up to 480K.

• The scanner PWB further connects to the SPDH PWB.

SD Memory Card

The SD card replaces the software module used on other products. The card will support these
functions:

•Boot ROM

•NVM

• MFD feature key

NOTE: These functions are not accessible by the customer.

SIM Card Interface

Provides a slot accessible to the user for configuring the machine.

A cryptomemory card ca n be plugged into a SIM c ard slot on the SBC PWB t o authenticate
machine features. The SBC will control this device via an I2C bus.

System Memory

System memory is 2GByte of DDR3 RAM. The chips are mounted directly to the SBC PWB.

Ethernet Base 10/100/1000T

• The Ethernet interface connects directly to the network.

• Is capable of waking up from sleep mode on detection of network traffic.

USB Interface

• The SBC PWB has 3 USB host ports and 1 USB device port. The USB host port 3 is con­nected to the UI USB port through an on-board connector.

• The Host ports support potential host functions, such as flash-drive plugability, biometrics
(security), USB printing, software upgrade and other user-identification devices, etc.
There are 2 ports acces sible through t he SBC tra y front and 1 p ort accessi ble within the
SBC tray for front of machine (UI) access.

NOTE: The USB Host power for attached peripherals is limited to 2.5W per port.

• The device port suppo rts functions such as fi eld service PWS (Po rtable Work Stations )
connection, and direct USB printing.

Debug

• UART. The SBC provides a UA RT interface for software debug/Altb oot. This interface
supports industry standard baud rates.

• Video. Video data, produced by the image path captured through debug connector on the
SBC PWB.

• JTAG. As required for any board updates and for access to CPU for software debug.

• 7 segment LED display. As required for debug purposes.

SATA HDD (Hard Disk Drive)

• The system provides one SATA HDD with a capac it y of 78GB and a data rat e of approx i ­mately 100MB/s (for sequential data).

• The HDD is used to store jobs from scan to export and some other jobs as well as to store
Ethernet jobs coming from the network.

Fax Card (Option)

The SBC PWB accommodates an interfa ce to the Fax . A Flat Pr inted Ci rcuit (FPC) cable pro ­vides the electrical interfa ce. The module pro vides 2 telephone line s, each serviced by a Fax
Modem.

Foreign Device Interface (Option)

• The FDI PWB is an optional PWB. It is used to interface to external input devices such as
coin input device.

• The FDI PWB option is an upgrade intended to be performed by a Xerox representative.

Harnesses

The SBC PWB module has its own set of har nesses to enabl e connecti vity of po wer and data
to the items within itself. The module internal harnesses are:

• SBC PWB to HDD (power and data).

• SBC PWB to fax connector PWB.

• FDI PWB to cage backplane.

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April 2017

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Principles of Operation

Mechanical Enclosure of the SBC Module

The SBC enclosure consists of a removable c over which allows access to the HDD an d Fax
bracket. The bracket is rem oved to gain ac cess to the SBC PWB. Th is enclo sure is located at
the rear of the machine.

The SBC complies with MN2-950 and contains ESD warnings.

SBC Power Up Sequence

The following events occur after the machine is plugged in.

1. The LVPS begins generating +5VSB for the SBC.

2. On the SBC PWB, the +5VSB is converted to +3.3V for the power management circuitry.

3. The power management circuitry begins flashing LED CR23 on the SBC PWB.
When the user presses the power button:

1. The power management circuitry activates the PS_ON signal.

2. The LVPS activates the main +5V and +24V supplies.

3. The power management circuitry begins enabling the remainder of the SBC.

4. The +5V is used to generate a number of voltages used by the main CPU.

5. The PWR_GOOD LED (CR7) will light.

6. The CPU will load the initial boot software from the SD card.

7. The initial boot software wil l enable the memory controller, SATA har d drive controller,
etc. and update the 7-segment display.

8. The initial boot software wil l load config urati on for the Horizo n FPGA, and then swit ch off
the Horizon_Configuration_Not_Done LED (CR19).

9. The Horizon FPGA will enable image path power, and hard disk power.

10. The KAMA_Configuration_Not_Done LED (CR11), and Image_Power_OK LED (CR6)
will switch on, and the Xerox screen will appear on the UI.

11. The initial boot software will load the configuration for the KAMA FPGA from the SD card,
and then switch off the KAMA_Configuration_Not_Done LED (CR11).

12. The initial boot software will read version number from each device on the SBC.

13. The main software kernel is loaded from the SD card.

14. The USB ports are searched for a software upgrade file. If available, the software is
upgraded.

If no upgrade is found, the main software code is loaded from the hard drive.

IOT PWB

The IOT PWB is respons ible for the control of all functions within the IOT. It is an inte lligent
controller containing a CPU with built-in flash ROM, RAM, and Magnetoresistive Random­Access Memory (MR AM) to store NVM . Its primary funct ion is to drive the motors, solen oids
and clutches within the IOT, supply control to the HVPS, contr ol the fuser power and mon itor
sensors. The IOT PWB has the following interfaces:-

• Serial RS422 and page sync control interface to the SBC PWB.

• Serial RS422 interfaces to optional finishing devices.

• Motor drives for trays 1, 2, 3 and 4.

• Control of the main drive module in AltaLink® B8065/B8075/B8090.

Power On

On application of power, the IOT PWB will perfor m its POS T (powe r on self-t est). On succ ess ­ful POST:

• The IOT application will flash the IOT diagnostic LED (0.5 second on / 0.5 second off).
The IOT will set sub-system defaults i.e. (load a copy of NVM to RAM pre-sets and messages.

e.g. fuser off and motors off.

The IOT will check communication channels (in order):

1. RS422/USB.

2. I2C for CRUM RFID reader.

3. Communication synchroni sation is attem pted between the IOT and finisher . If communi­cations between IOT PWB an d finish er can no t be est ablished, a fault is decla red to the
device controller.

4. Communication synchronisation is attempted with the SBC PWB.

5. Check paper path sensors are clear (no paper present).

6. Check interlocks are closed.

7. initialize the fuser (warm up).

8. initialize the paper trays (raise).

9. initialize the toner dispense system (ready to mark).

Power Off

When the power off button is pressed, the user will be offered the option to initiate a controlled
power off via the user interface, put the system into power saver mode, reboot or cancel the
power off request.

When the SBC software has estab li shed that power can be removed it will disa ble the P S_ON
signal to the LVPS.

Principles of Operation

Prior to any occurrence of stopping the IOT, the IOT PWB will save CRUM data to NVM.

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Xerox® AltaLink® B8090 Family Multifunction Printer

Launch Issue

Software Loading

Overview

Software loading may be performed as part of a repair procedure or as a customer upgrade.

Software upgrades may inc lude software fixes, enhancements , maintenance, client softwa re
tools and optional features.

Software Upgrade Methods

There are various methods to upgrade the software. Refer to Table 2.

Software Upgrade Process Descriptions

DLM

The System Administrator sends a *.dlm file containing all device software to the device via the
network (received as a p rint job) . The de vice re cognize s the p rint job as a ‘D LM upgrad e’ and
extracts the file. The DLM then updates the device.

NOTE: DLM needs to be enabled first.

Power on Software Compatibility Checking

Table 2 Software upgrade methods

Further

User Upgrade Type Occurs when

Power on upgrade. At install if an optional device is fit-

Customer DLM upgrade via a net-

work.

DLM upgrade via USB. A customer requires a SPAR or

CSE Altboot via USB (see

Note).
Altboot via PWS (see

Note).

NOTE: A normal or forced AltBoot can be performed.

Software Compatibility Database (SCD)

Software upgrade relies on the Software Co mpatibil ity Database (S CD). The SCD spe cifies a
set of compatible software versions for all software module s that can be p art of the system.
The SCD also holds a collective version nu mber known as the Softwa re Set Number which
uniquely defines the set of software versions in the SCD.

The Software Set Num ber inc lu des a Prod uc t ID tha t is u se d to chec k tha t th e S oftwa re S et i s
correct for the product to be up graded. Pr oduct IDs are defined by the So ftware Confi guration
Management (SCM) team.

The machine SCD is stored by the machine and is retained across power cycles. The machine
SCD specifies the set o f software versions that the machine ex pects to be on its modules,
known as the Machine Software Set. In additi on to the software ver sions, the machine SCD
holds the Machine Software Set Number which uniquely defines the set of software versions in
the machine SCD.

ted which has a different software
level to the machine.
During service when a new compo­nent is installed that has a different
software level to the machine.

A customer requires a SPAR or
later software installed.

later software installed.
As directed by service procedures GP 4.

information

Refer to the
ReadMe sup
plied with the
software.

GP 4.
GP 4.

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At power on the system verifies all modu le software versions. All inco mpatible software ver­sions in any module are upgraded automatically.

USB Drive Upgrade

A software upgrade can be performed loc ally by downloading a DLM fil e from a USB drive to
the device. This feature allows non-connected devices to have system upgrades without
requiring a PWS or network drop.

NOTE: This is not an AltBoot upgrade and does not erase all of the data on the hard disk.

USB Drive AltBoot

USB drive AltBoot is used to repair problems where the network controller fails to boot due to a
software problem. AltBoot erases all the data on the hard disk. USB drive AltBoot is invoked by
inserting a USB drive with an AltBoot file on it.

If there is more than one AltBoot software file on the USB drive in the AltBoot directory the Alt­Boot software file with the most recent version will be selected.

Normal and Forced AltBoot Modes

Normal Altboot

A normal (unforced) AltBoo t will repartition and reformat the hard disk and when applicable,
then install the software o n th e S BC h ar d dis k d riv e an d the mem ory mod ule . If a later version
of software has been in stall ed, the AltBo ot will be follo wed by a power on upg rade of al l mod
ules that had were at a lower software level.

Critical data and user settings are preserved by the AltBoot (as summarised below):

• Network Configuration settings including:
– User NVM settings.
– Web certificates.
– Local template pool web user interface created Scan to File templates.

All other data is not backed up or restored by the AltBoot.

Forced Altboot

In addition to repartitioning and reformatting the hard disk then installing software, a forced Alt­Boot will upgrade all upgradable modules regardless of the current software version.

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Principles of Operation

Software Upgrade Progress

During the software upgrade, a progress screen is displayed on the UI (refer to GP 4).

Refer to Table 3 for details of which modules are represented by each pr og re ss bar dur in g the
software upgrade.

Table 3 Represented modules

Progress bar Module

User Interface UI PWB
Copy Controller Hard disk drive
Network Controller Hard disk drive and memory module
Print / Copy Engine IOT PWB
Scan Engine Scanner PWB
Fax HDD SBC
Finisher 2K LCSS PWB, L V F PWB, HVF PWB

Upgradable Modules

Refer to Figure 3 and Figure 4. The followi ng modules ar e upgradable by a software upgr ade
(GP 4):

• SBC PWB SD card.

• Hard disk drive.

• Scanner PWB.

• SPDH PWB.

• UI PWB.

•IOT PWB.

• Finishers (2K LCSS, LVF BM or HVF BM).

• Tray 6 module (Paper Feeder Platform)
SBC PWB (CC/XUI/NC)

IOT PWB and Finishers

The IOT PWB is connected to the SBC PWB and the finisher. The IOT PWB receives software
upgrades from the SBC PWB and sends software upgrade s to the finisher. The IOT PWB
receives version number s from each installed finisher and sends the version numbers to the
SBC PWB.

Tray 6 Module (Paper Feeder Platform)

The IOT PWB is connected to the tray 6 control PWB. The IOT PWB receives software
upgrades from the SBC PWB and sends software upgrades to the tray 6 control PWB. The IOT
PWB receives version the number from the installed tray 6 module and sends the version num
ber to the IOT PWB.

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The copy controll er, UI and networ k controller software modu les run o n the same SB C hard­ware platform (subsystem).

Software Upgrade (SWUP) runs on the SBC hardware platform and receives software
upgrades for the software modu le s on the SBC PWB itself and the other par ts of the machi ne.
The SWUP may obtain software u pgrades from the network controller, a USB driv e, or the
PWS.

UI

For the purposes of a soft war e up grade , the UI i s con nec ted to th e S BC PW B. T h e UI m odu le
is upgradable by the SBC PWB.

Scanner and SPDH

Both the scanner PWB and SPDH PWB are upgradab le by the SB C PWB.

Principles of Operation

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Xerox® AltaLink® B8090 Family Multifunction Printer

Figure 3 Software upgrade information (1 of 2)

Figure 4 Software upgrade information (2 of 2)

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April 2017

8-17

Principles of Operation

Single Pass Document Handler (SPDH)

Overview

The Single Pass Document Hand ler (SPDH) is mounted above the pl aten scanner. Together
the SPDH and platen scanner form the image input terminal (IIT) for the AltaLink® B8090F
machines. (See also Scanner Overview.)

The SPDH allows a user to scan origi nal documents of various sizes and original types to
enable either the system c opy or system scan to file functional ity. The user inter acts with the
SPDH in the following ways:

• Lifting and lowering the SPDH to access the document glass for registering original docu­ments for platen scanning

• Lifting and lowerin g th e SP DH to a cc ess the do cu men t glas s an d CV T g lass s urfac es f or
cleaning and maintenance

• Loading original documents into the input tray of the SPDH

• Adjusting the document width guide positions to register the original document

• Removing re-compile d original docume nts from the SPDH output t ray once scanning is
complete

• Lifting and lowering the SPDH to ope n the SPDH paper path for the remov al of jammed
sheets, and to allow access to the side 2 scan assembly for cleaning

The SPDH is a center registered automa tic doc ument han dler, that se parates and feeds up to
200 (face up) original documents of 80gsm individually in 1 to N order. It is capable of scanning
simplex (this mode scan s only on e sid e of a doc ument set) and d uplex ( this mode scan s both
sides of a document set) documents . For simplex images the SPDH transports documen ts
over the CVT window of the pla ten scann er. The do cumen t is the n transpo rted to the r e-stac k
tray. For duplex images side 2 of the document is scanned via the side 2 scan assembly as the
document is transported to the re-s tack tr ay. The sid e 2 scan assemb ly is mo unted in ternal to
the SPDH. Document output to the re-stack tray will be in the same order as input (face down),

Figure 1.

Input tray

Principles of Operation

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Restack tray

Figure 1 SPDH

Launch Issue

Xerox® AltaLink® B8090 Family Multifunction Printer

Counterbalances

Two counterbalance assemblies, Figure 2, secure the document handler to the scanner frame.
A counterbalancing force is generated by compression springs acting on a cam-follower
arrangement, all housed within sheet metal brackets. Above a set drop-down angle, the SPDH
will hold or rise slowly to the maximum opening angle. Bel ow the set drop-down angle, the
SPDH will gently close onto the sca nner. The right hand brac ket provides a me ans of adjust
ment for document skew. In addition, the counterb alance assemblies are double-hinged to
allow a customer to close the SPDH onto books of up to 25mm in thick ness without appl ying
excessive force to the doc ument glass of the scanne r. This feature is known as bo ok-mode
operation.

SPDH Power

The SPDH top cover interlock s witch, S05-305, Figure 3, is located at the rear of the SPDH.
S05-305 controls the +24V supply to all clutches, solenoids, motors and the side 2 scan
assembly via the SPDH PWB . The SPDH top cover switch isolates the SPDH +24V circuit
when the top cover asse mbly is opened. The inte rlock is used to ensure o perator safety by

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removing power to the SPDH driv es when not actuated. The scanner PWB su pplies +3.3V,
+5V, +12V and +24V to the SPDH PWBA. The SPDH PWB then controls the output of powe r
to all the components in the SPDH.

Right counterbalance Left counterbalance

Figure 2 Counterbalances

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April 2017

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Top cover interlock switch

Figure 3 Top cover interlock switch

Principles of Operation

Input Tray

s

Copies are placed into the input tray face up, 1 to N order. The capacity of the input tray is 200
originals of 80gs m w eight. The mi nimum siz e origi nal i s A5 ( 5.5 X 8.5 in ch), SEF o r LE F. The
maximum size of original is A3 (11 X 17 inch), SEF only . Table 1 lists re cognized pape r sizes
and orientations. Intermi xed lengths (feed direction) are accepta ble for a limited number of
document pairs, which ar e des cribed b elow in the Mixed S ize M ode secti on. T he tray wi ll pro
vide for center feedi ng in 1 to N sequ ence. Movable tray gu ides for the docume nt width are
provided. Correct guide adjustmen t by the operator is imperati ve for reliabl e feeding and auto
paper select. The SPDH document present sensor (Q05-309), detects originals loaded against
the document registration wall. When the SPDH document present sensor is actuated the doc
ument set LED (LP05-084), illuminates. Refer to Figure 4.

Refer to Table 1 and Table 2 for details of document sizes.

Document present
sensor

Document width guide

T able 1 Document sizes

Document Sizes SEF Document LEF Document

8.5 x 11 Yes Yes

8.5 x 13 or 8.5 x 14 (1) Yes No

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B4 Yes No
A3 Yes No
11 x 7 Yes No

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NOTE: (1) The SPDH cannot differen tiate between these sizes. The UI wil l display relevant
media size dependent upon market region stored in NVM.

Table 2 Document sizes

Maximum and Minimum document size
in the process direction

138mm/5.4 inches to 432mm/17
inches

Document Size Sensing and Selection

Document size sensing and selection is achieved by a combination of:

• Width sensing (cros s-process direction).

• Static and dynamic length detection (process direction).

• Mixed Size Mode.
Static Size Sensing

Maximum and Minimum document size
in the cross process direction

138mm/5.4 inches to 432mm/17 inch es

Document set LED

Figure 4 Input tray

Table 1 Document sizes

Document Sizes SEF Document LEF Document

A5 or 5.5 x 8.5 (1) Yes Yes
B5 Yes Yes
A4 Yes Yes

Principles of Operation

Document registration wall

The SPDH determines the s ize of th e of th e or i gin al d ocument and whether the paper is being
fed long-edge feed (LEF) or shor t-edge feed (SEF) upon the combin ed sign als from the docu
ment side guide width sensors and the input tray length sensors. Each combination of the input
tray sensing regions have an associated default paper size, so when a user places a document
into the input tray the SPDH makes an assumption of the loaded document size.

Static Width Sensing

Three document width s ensors determine the width of the ori ginal document, wi dth sensor 1
(Q05-325), width sensor 2 (Q05-326), and width sensor 3 (Q05-327). The width sensors detect
flags mounted to the bottom of the movable in-board and out-board document side guides. The
document side guides are cen trally register ed and synchrono usly move via a rack and pinion
mechanism. As the guides mov e, the flags block and unblock the wi dth sensors. The SPDH
uses the signals from the width sens ors to determine pape r width of the original docum ent. If
the guides are not positioned correctly then the top edge registration and LE skew of the
scanned documents cannot be guaranteed. The guides provide some resistance to movement
so that they remain in position du ring the scanning of the original do cument. The side guide s
also limit the maximum thickn es s of orig ina l doc um ent st ack tha t can be load ed wit h stack lim
iting features.

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Launch Issue

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Static Length Sensing

Auto Reduction/Enlargement

Static length detection is used to determine document length of the original document, for most
document sizes and orientations. This is accomplished with two sensors, length sensor 1,
Q05-315, and length sensor 2, Q05-320, located in the input tray, which are at appropriate dis
tances from the docume nt r eg istr ation wall. The state of these two le ngth s ensor s whe n d ocu ­ments are loaded from against the document registration wall at start of a job will determine the
stack length range.

Dynamic Length Sensing

Dynamic length sensing is utilized to determine the length of docu ments that are not recog­nized by the static le ngth sensors. This featur e only works if the paper su pply automatically
select feature has been chosen by the operator.

At the start of a c opy job the i mage data of the first s canned docume nt of unknown length is
reconciled with docu ment length data stored on SB C PWB. If the scanned image leng th is
matched with stored document length data on the SBC PWB, image processing will continue. If
no document length match is foun d the SB C PWB wil l reques t a UI stat us mess age to be d is
played to the operator to enter the required paper size.

Dynamic length sensing is required for the document sizes shown in Table 3.

Table 3 Document sizes

Document size

8.5” x 11” SEF
A5 LEF

8.5” x 5.5” LEF
A5 SEF

8.5” x 5.5” SEF

In combination with mixed s ize mode the user can select auto reduction/enlargemen t. When
selected the document will be scanned to the copy paper size. All copy enlargement and

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reduction is controlled by the SBC PWB.

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Mixed Size Mode

This option is selected thr oug h th e fea tures i n the us er in ter fac e a nd a llows the us er to c op y a
set of documents th at contai n two di fferen t si ze s as l isted i n Ta ble 4. With all Mixed size origi
nal jobs, both sizes in the pair must be of the same cross-process width.

Table 4 lists the valid pairs of doc ument sizes which the I IT will recognise and enable as a

mixed size mode job. Dur ing mixed size mode dynami c length sensing will be p erformed on
each individual scanned document.

T able 4 Document sizes

Valid document pair Short doc length

A3 SEF + A4 LEF 210mm
A4 SEF +A5 LEF 148mm

8.5” x 11 SEF + 8.5 x 5.5 LEF 139.7mm

8.5 x 14 SEF + 8.5 x 11 SEF 279.4mm
11 x 17 SEF + 8.5 x 11 LEF 216mm
B4 SEF + B5 LEF 176mm

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Principles of Operation

8-21

Drives

Three 24V motors provide the drive for the SPDH components, the feed motor and read
motors are shown on Figure 5, the Tray elevator motor is shown on Figure 8.

Feed Motor

The feed motor (PL 5.18 Item 2) supplies continuous drive via a toothed belt and gears to both
the takeaway roll clutch, CL05-425, and feed clu tch, CL05 -0 25, du ring the scan pr oces s of the
document. The TAR clutch, when energized provides drive to the takeaway roll. The feed
clutch when energized provides drive to th e feed, nudger and retard r olls that form the full y
active retard feed assembly, via their respective gear trains, Figure 6.

Feed clutch

Feed motor

Feed roll

Nudger roll

TAR clutch

Principles of Operation

Feed motor Read motor

Figure 5 Feed motor and read motor

Fully active retard (FAR) feed
mechanism

Takeaway roll assembly

Retard roll

Figure 6 Feed motor

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Launch Issue

Read Motor

The read motor (PL 5.1 8 Item 1) supplie s continuous dr ive to the pre scan r oll assembly and
mid scan roll assembl y. The exi t roll assem bly is dr iven by a p ulley and to othed b elt arrang e
ment from the mid scan roll, Figure 7. The rea d motor also provides the drive (when run in
reverse) for the side 2 scan assembly calibration mechanism, shown in detail in Figure 16. The
exit jam clearance knob (PL 5.17 Item 5), under the front left corner of the SPDH, can be used
to clear jams and feed documents along the document path to activate sensors for diagnostics.

Tray Elevator Motor

The tray elevator motor (PL 5.30 Ite m 1 4) raises and lowe rs the input tr ay in order to mai ntain

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the document stack at the optimum feed position, Figure 8. The motor drives a gear chain that
rotates a pair of actuators that raise and lower the tray.

Lift Home Position Sensor

The lift home position (lowered) sensor, Q05-307 , is a flag actuated sensor th at senses the
input tray is in the home position, Figure 8.

Exit jam clearance knob

Mid scan roll assembly

Pre scan roll assembly

Figure 7 Read motor

Read motor

Exit roll assembly

Lift home position sensor

Tray elevator motor

Actuators

Figure 8 Tray elevator motor

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Principles of Operation

Scanning Process

1. The document present s ensor, Q05- 309, detect s that a docum ent has be en loaded o nto
the input tray and positioned against the registration wall of the separation assembly.

2. At the detection of a d oc ume nt, o r at p ower o n, t he S P DH i nit ial izes th e c alib ra tio n of the
side 2 scan module and platen scanner.

3. The size of the document is calcula ted by a combinati on of signals from width se nsor 1,
Q05-325, width sensor 2, Q 05-326, width se nsor 3, Q05-327, a nd length sensor 1 Q 05­315, and length sensor 2, Q05-320.

4. The input tray elevator mechani sm, in con junct ion with the stack height sensor Q05 -310,
raises the input tray to position the doc ument stack at the optimum heigh t for feeding at
the start of a copy job . The tr a y he ig ht will r ais e in i nc re men ts (a ppr oxim ate ly at e ve ry 25
sheet feed for xerox 8 0gs m pa per) to ma in tai n a n o pti mum fe edi ng po sitio n throughout a
copy job.

5. By means of a fully active reta rd feed mechanism the SPDH feeds the document s from
the input tray into the paper path of the SPDH. The feed and read motor are activated and
the feed clutch is energized. On activation of the feed clutch the nudger roll is driven down
onto the document stack. Simultan eou sl y as the feede r me chani sm drive s the nud ger ro ll
down it raises the two gate finge rs. The nudger drives the top document off the s tack
across to the separation assembl y and in to the full y active re tard nip, fo rmed by the feed
and retard rolls (see Docum ent Separation) . The nudger roll rema ins energized until the
lead edge of the docu me nt arr ives at the feed se nsor , Q 05 -330. W he n th e l as t docum ent
has been fed the feed m otor mom enta rily ru ns in r evers e, this ena ble th e feede r me cha
nism to raise the nudger roll and drop the two gate fingers.

6. The feed sensor, Q05-330, positioned between the TAR nip and the separation nip
detects the lead edge (LE) of a doc ument once it has been acquired and th en the trail
edge (TE) to confirm an inter document gap (IDG).

7. The document momentarily butts against the takeaway roll assembly where the document
realigns if skewed. The document has space to corrugate witho ut creasing within the
buckle chamber of the document handler.

8. The feed clutch, CL05-025, is deenergized, thereby de-coupling the nudger and feed rolls
and the takeaway clutch, CL 05-425, is energized and the take away roll assembly pulls
the document through the FAR nip.

9. The document contin ues through the takea way nip until the lead edge is dete cted at the
registration sensor, Q 05-340, and the ta keaway clutch , CL05-425, is de energized. If the
SPDH has not received a feed request signal from the scanner PWB the takeaway clutch,
CL05-425, will de-energise and the document feed will stop. If the feed request signal has
been received the document will continue to be scanned.

10. The feed request signal starts the scanning operation. The read motor drives the pre scan
roll assembly, which transpor ts the document across the image ar ray for scanning, and
onto the mid scan roll assemb ly. Since the rolls driving the pap er are controlled by the
same timing belt and motor, the velocity of the paper is constant.

11. If a simplex job has been requested the document passes the CVT window, is lifted by the
CVT ramp, and is deliv ered into the re- stack tray. If a dupl ex job has been r equested a
scan of side two of the document is made. The side 2 registration sensor, Q05-343,
detects the lead edge of the doc ume nt in ord er to tim e the s tart of the side two scan. The
document then continues into the re-stack tray after side two is scanned.

Document Separation

The separation of documents is performed by the feeder assembly working in conjunction with
the separation ass emb ly and operates on a diff er enti al of fric ti on princ i ple . T he fe ed as sembl y
contains the nudger a nd feed rolls and the separation assem bly contains the retard roll. The
retard roll is dri ven via a s lip cl utch, and in the op erati onal positi on it is spr ung l oaded again st
the feed roll to form the separation nip.

The feed roll has a high coefficie nt of friction with the do cuments fed from the in put tray. The
retard roll also has a coeffic ient of friction with th e documents fed fro m the input tray but one
that is lower than that of the feed roll, though higher than the coefficient of friction between two
documents.

Once activated the nudger roll feeds the top document off the input tray and into the separation
nip. In turn the feed roll drives the top document towards th e TAR assembly while the r etard
roll is driven in the op posite direc tion, in order to seg regate all documents other than the top
document passing through the FAR nip.

The feed roll transports the top document in the proc ess dir ec tion bec au se it has a high coe ffi­cient of friction with the top document. The top document is given a coefficient of friction due to
the force imparted by the feed roll and ov ercome s the torque suppli ed by the sl ip clutch of the
retard roll. This causes the retard roll to be driven by the feed roll. If more than one document is
fed from the document stack on the input tray, documents other than the top document are put
in contact with the retard roll. The se lowe r docu men ts are pr evente d fr om be ing tra nspor ted in

­the process direction because the torque of the ret ard roll slip c lutch is not ov ercome by the
friction between the two docu ments, resulting in only the top sheet being tr ansported in the
process direction toward the TAR assembly.

Principles of Operation

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Xerox® AltaLink® B8090 Family Multifunction Printer

5.4 SPDH Sensors

There are several sen sors located throughout the document path to detec t the positi on of the
document. The signals from these sensors initiate operations within the SPDH, and also assist
with jam detection, Figure 9.

Takeaway sensor

Feed sensor

Feed roll

Nudger roll

Retard roll

Pre scan roll

Registration sensor Side 1 scan line Mid scan roll

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CVT ramp

TAR roll

Side 2 registration sensor

Figure 9 SPDH document path

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Exit roll

Side 2 scan line

Principles of Operation

Sensor Types and Locations

Document Present Sensor

The document present sensor, Q05 -309 (PL 5.30 Item 6), is a r eflection a ctuated sen sor that
senses the presence of a document loaded into the input tray, Figure 10. When the SPDH doc
ument present sensor is actuated the docum ent set LED, LP05- 084, illuminates in the SPDH
top cover. When the last she et has left the inp ut tray the sensor triggers t he signal to stop the
document feeding process.

Stack Height Sensor

The stack height sensor, Q05-310 ( PL 5.20 Item 4) , is a flag ac tuated sensor that senses the
paper stack and maintains the stack height by triggering activity of the tray elevator motor, Fig

ure 10.

Stack height sensor
actuator

Length Sensor 1

The length sensor 1, Q05-3 15 (PL 5.30 Item 5), is a fl ag actuated sen sor that sense s docu­ments in the input tray longer than 300mm, Figure 11.

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Length Sensor 2

Length sensor 2, Q05-320 (PL 5.30 Item 5), is a flag actuated sensor that senses documents in
the input tray longer than 240mm, Figure 11.

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Document set LED

Principles of Operation

Figure 10 Paper stack sensors

Stack height sensor

Document present
sensor

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Length sensor 2

Length sensor 1

Figure 11 Length sensors

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Calibration Home Position Sensor

The calibration home posit ion sensor , Q 05-36 0 ( PL 5.18 Item 9), is a flag actuated sensor that
senses that the calibration strip of the side 2 scan assembly is in the home position, Figure 12.

Calibration home position sensor

Width Sensors: 1, 2 and 3

Width sens or s (PL 5.30 Item 5) 1, Q05-325, 2, Q05-326, and 3, Q05-327, are actuated by flags
attached to the document wid th gu ide s o f the i npu t tray . The 3 wi dth se nsor s are p os itione d to
allow the detection of common document widths. Working with length sens ors 1 and 2 they
enable the machine software to determine various document sizes, Figur e 13.

Width sensor 1

Figure 12 Calibration home position sensor

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Width sensor 3 Width sensor 2

Figure 13 Width sensors

Principles of Operation

Feed Sensor

The feed sensor, Q 05-330 (PL 5.20 Item 9), is a reflection activated sensor that senses the
lead edge and trail edge of documents leaving the feed assembly to confirm the presence of an
inter document gap, Figure 14.

TAR Sensor

The takeaway sensor, Q0 5-335 (PL 5.20 Item 9), is a reflection acti vated sensor that senses
the lead edge and tr ail edge of documen ts entering the takeaway roll ass embly. This sens or
triggers the stop of the separation nip and nudger rotation. This allows the takeaway roll
assembly to pull the doc ument through the separation nip to ensure an interdocum ent gap,

Figure 14.

Registration Sensor

Registration sens or, Q05-340 (PL 5.18 Item 9), is a reflection activated sensor that senses the
lead edge and trail edge of documents just prior to the side 1 scan area, Figure 15.

Side 2 Registration Sensor

The side 2 registration se nsor, Q05-34 3 (PL 5.18 It em 9), is a reflection activated sensor that
senses the lead edge and trail edge of documents just prior to the side 2 scan area, Figure 15.

Registration sensor
(side 1)

Feed sensor Takeaway sensor

Figure 14 Feed and takeaway sensors

Principles of Operation

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Side 2 registration sensor

Figure 15 Registration sensors

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Xerox® AltaLink® B8090 Family Multifunction Printer

Side 2 Scan Assembly C al i b ra ti o n

The calibration mechanism consists of a white calibration strip attached to the glass surface of
the scanner face on th e underside o f the scanner. The white strip on the glas s surface oper
ates as a spring loaded sliding shutter driven by a pair of cams. The white calibration strip pro­vides a scannable area for th e ful l w idt h of t he s ide 2 s c an a ssem bly , a nd s erv es as a uni for m
reference for the video control system that uses it to calibrate the video data.

Calibration is nece ssary because tolerance variatio ns in the scanner may result in different
video data. The calibration procedure scans the calibrati on strip, compares the sign als to set
point values stor ed as Non-Volatile Memor y (NVM) data, and then cal culates a white point
value to ensure consistent video data. There is no black calibration strip. Black calibration is
performed with the lamp off.

Calibration of the side 2 scan assembly is performed at power on or the sensing of a document
in the input tray. At the time of calibr ation the read moto r is driven in the op posite rotational
direction to that of the scanning proc ess. The spring loaded sliding glas s of the side 2 scan
assembly is moved by a cam and actuator arran gement. A pair of ca ms is rotated on a cam
shaft via a belt and pulley syst em. In norm al oper ation th e mechanis m is prev ented from rota­tion by the use of a one way clutch-gear.

As the cams rotate they push against followers at either end of a pivot shaft that move a pair of
actuators. The inboard a nd outboard actuators push against pegs attached to the s canner
glass. The action of the actuators on the pegs cause the glass to slide in the scan process
direction, positioning the calibration strip directly under the scan line of the side 2 scan assem
bly. Once the calibration strip is in this position the calibration process takes place.

Further reverse rotation of the cam disengages the two actuators and the spring loaded shutter
returns to it’s scannin g operation p osition. A flag on th e inboard end of the cam shaft s ignals
the calibration hom e position sensor, Q05-360, that th e calibration strip of the side 2 scan
assembly is in the home position, Figure 16.

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Principles of Operation

Side 2 Scan Assembly C al i b ra ti o n Drive Train

The drive train for the side 2 sca n assembly cal ibration mec hanism is as follows (refer to Fig-

ure 16):

1. Read motor, PL 5.18 Item 1(not shown).

2. Read motor idler gear, PL 5.19 Item 16.

3. Mid scan drive gear, PL 5.19 Item 12.

4. Mid scan roll, PL 5.17 Item 3.

5. Mid scan roll pulley PL 5.19 Item 18.

6. Exit roll drive belt, PL 5.19 Item 19.

7. Exit roll pulley, PL 5.19 Item 21.

8. Exit roll assembly, PL 5.17 Item 2.

9. Calibration shutter drive gear, PL 5.19 Item 8.

10. Calibration shutter idler gear, PL 5.19 Item 6.

11. Calibration shutter driven gear, PL 5.19 Item 7.

12. One way gear clutch.

13. Cam shaft

14. Front calibration cam, PL 5.19 Item 20.

15. Cam follower

16. Pivot shaft.

17. Outboard (front) actuator and inboard (rear) actuator.

Principles of Operation

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Xerox® AltaLink® B8090 Family Multifunction Printer