Sharp UX-B20 Service Manual Download

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UX-B20U/UX-B20C/B25C

3 – 3

[2] Ink jet printer

1. Engine specifications

1.1. Mechanism

Resolution:600dpi x 600dpi address ability

Print speed:2.9PPM text with black cartridge

Print swath:8 inches

Duty cycle:250 pages per month average

Dimensions:330mm x 100mm x 130mm

Weight:1.98punds(900g)(1p=453g)

Acoustics:50db in letter quality mode

1.2. Electrical

No electrical hardware included with the type B engine except for the
carrier drive stepping motor, the Sensor FPC assembly which includes
a photo interrupter for sensing home position, the carrier cables, and
the printhead cable.

2. Abbreviations

EOF End-of Form

ESD Electrostatic Discharge

FRU Field Replaceable Unit

HVPS High Voltage Power Supply

LVPS Low Voltage Power Supply

OEM Original Equipment Manufacturer

POST Power-On Self Test

V ac Volts alternating current

V dc Volts direct current

ZIF Zero Insertion Force

3. Diagnostic information

3.1. Print cartridge

Black Print Cartridge 208 Nozzles

Pigment based(Water proof)

initial cartridge

Approx.yield 300 letter pages at 4%coverage

Replacement cartridge:SHARP

UX-C70B

Approx.yield 600 letter pages at 4%coverage

* When Ink Save mode is enabled.

3.2. Start

Power-On Self Test (POST) Sequence

When you turn the printer on it performs a POST. Turn the machine on
and check for a correct POST operation by observing the following:

1. The carrier moves.

2. The paper feed gears turn.

3. After 30 seconds the carrier moves over the maintenance station

and caps the printhead.

4. All motors stop

4. Circuit description

4.1. General description

The compact design of Ink PWB is obtained by using Head Driver IC
and Home position Sensor.

4.2. Electrical system

The PWB provides mechanical control for Ink Jet Printer. Fig. 1 shows
the interconnection of PWB and other electrical component in the print
mechanism.

4.3. Electrical overview

The information in this section appears in a sequence relative to the
system diagram in the following figure.

4.4. Power supply connector

The mechanism requires two voltages (+3.3V, +11.82V and +30V).
These three voltages supplied from CNHEAD1 connector.

4.5. Host interface connector

FFC on the Ink PWB provides 23 lines from the host unit, for control of
various operating options available to the host. The two primary func-
tions of the host interface are:

Printing data for the Ink Jet Printer

Error status to the host

4.6. Driver IC

One driver IC drive 208 (MONO) nozzles on the cartridge. This driver
IC, located on the Ink PWB, also connected back to the ASIC, on Con-
trol PWB.

4.7. Ink cartridge carrier

The carriage connects via a FPC on the Ink PWB. The ink cartridge
contacts connect to the carriage contacts. The ASIC controls the car-
riage and ink cartridge.

4.8. Home position

Measure the position of the carrier unit by reading the scale of the
encoder ((1) in the figure) with the photo sensor ((2) in the figure).
When power is supplied, the carrier unit moves right until it contacts
the dead-end of the right main frame ((3) in the figure). We call this
home position and hereinafter, regard as the starting point to measure
the position of the carrier unit by reading the scale of the encoder with
the photo sensor. The home position shall be applied to all operations.

Fig. 1

Fig. 2

Fig. 3

FFC

Photo Sensor

Control PWB

FPC

Driver

Control PWB

Sensor

Home Position

Head