SAMSUNG SF-331P, SF-330 Service Manual
SF -330 Series Graphic Print Bar
Service Guide
Graphic print bar with print cartridge installed
Samsung Electronics Confidential
Copyright Samsung Electronics Company 2002 Revision 1.0 July 12, 2002
Samsung Electronics Confidential
SF-330 Series Graphic Print Bar Service Guide
SF-330 Series Graphic Print Bar
Service Guide
Contents
1 Product Overview ...........................................3
1.1 Carriage Drive System....................................................... 3
1.2 Carriage Movement ........................................................... 4
1.3 Print Cartridge Maintenance............................................... 4
2 Troubleshooting............................................. 5
2.1 Print Quality...................................................................... 6
2.2 Print Cartridges ................................................................. 9
3 Part Replacement.........................................11
3.1 Carriage Motor................................................................11
3.2 Service Station Parts .......................................................12
3.3 Cap and Wiper Replacement............................................12
Figures
Figure 1-1. Carriage drive system .................................................... 3
Figure 1-2. Installing the print cartridge .............................................5
Figure 1-3. Service station and components ..................................... 5
Figure 2-1. Example of missing dots shown as partial printed rows
(white stripes) in the printout............................................................ 7
Figure 2-2. Properly installed print cartridge ...................................... 7
Figure 2-3. Cleaning the electrical contacts on the carriage (left)
and print cartridge (right).................................................................. 8
Figure 2-4. Removing crusted ink from the print cartri dge................... 9
Figure 2-5. Use before date on print cartridge package....................10
Figure 3-1. Left side of the carriage bar showing the two motor
mount screws...............................................................................12
Figure 3-2. Service station viewed from the bottom showing the
gear which releases the carriage lock .............................................12
Figure 3-3. Service station (viewed from the top) showing the
direction to push the cap/ wiper rotating assembly............................ 12
Figure 3-4. Removing the wiper with a screw driver .........................13
Figure 3-5. The back side (a) and the left end (b) of the print bar
and removal of the service station from the front (c).........................14
3.4 Service Station Removal and Replacement....................... 14
3.5 Encoder Strip Spring ....................................................... 15
3.6 Encoder Strip ..................................................................16
3.7 Carriage Rod Lock ..........................................................18
3.8 Carriage Rod .................................................................. 19
3.9 Carriage Assembly and Drive Belt .................................... 19
4 Appendix......................................................22
4.1 Assembly Illustration ........................................................ 22
4.2 Troubleshooting Flowchart ............................................... 23
4.3 General Media Specifications ...........................................23
Figure 3-6. Right end (a) and the left end (b) of the print bar,
showing the flanges that hold the encoder spring. ............................ 15
Figure 3-7. Right end of the print bar with rod lock in down position .. 16
Figure 3-8. Right end with arrow showing clockwise rotation of rod
lock into position ........................................................................... 16
Figure 3-9. Front of the print bar showing the flex circuit and the
encoder strip behind the carriage....................................................17
Figure 3-10. Right end of the print bar showing how to release the
rod lock........................................................................................ 18
Figure 3-11. Pushing the belt tensioner toward the carriage
compresses the spring to release the tension on the drive belt..........20
Figure 3-12. Lifting the carriage assembly off of the chassis .............20
Figure 3-13. Clear plastic flex clamp that secures the circuit to the
chassis......................................................................................... 21
Figure 3-14. Bottom of print bar showing belt attachment to the
carriage........................................................................................ 21
Figure 3-15. Drive belt gear and the flange that holds it in place ....... 21
Figure 4-1. Exploded view of a graphic print bar with part notations .. 22
Figure 4-2. Troubleshooting flowchart ............................................ 23
Tables
Table 2-1. Print cartridge life specification....................................... 10
Revision History
Revision Date Revision description
1.0 July 10,2002 Document released
Copyright Samsung Electronics Company 2002
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Revision 1.0; 23-Jul-02
SF-330 Series Graphic Print Ba r
Samsung Electronics Confidential
SF-330 Series Graphic Print Bar Service Guide
Service Guide
1 Product Overview
The product is a 600 dpi color inkjet raster graphics print bar designed for integration into an OEM’s phone fax or
plain paper (MFP) fax product. The product consists of a small carriage assembly and carriage drive system,
which use s a short (47 mm high) replaceable inkjet print cartridge to provide the OEM with the ability to create a
small form factor product with optimal reliability and performance. The product ‘s electrical design includes print
control ASICs to allow compatibility with the OEM’s (or 3rd party) fax controllers. This allows the OEM
flexibility to design either a standalone phone fax or an MFP product with a PC interface.
1.1 Carriage Drive System
The carriage drive system includes several components, which control carriage movement, maintain the print
cartridge, and enhance print quality (see Figure 1-1).
Electrical
interconnect
contacts
Service station motor
Figure 1- 1. Carriage drive system
Carriage and encoder
Rotating service
assembly (wipers,
caps, etc)
Service station
Carriage motor
Flex circuit
Electrical interface with
logic PCA on the printer
Chassis
Carriage belt
Pulley assembly
and belt tensioner
Carriage rod
Encoder strip
Carriage rod lock
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SF-330 Series Graphic Print Ba r
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SF-330 Series Graphic Print Bar Service Guide
Service Guide
1.2 Carriage Movement
The carriage is belt driven, using a 3-to-1 gear set for coupling to the motor. The gear set minimizes side-loading
of the motor, because the belt is not attached directly to the motor. The belt is supported and driven at the left end
by the belt gear, and supported at the right end by the idler pulley. The belt is mounted to a clip that snaps into the
back of the carriage.
The top of the carriage travels across the carriage bar on a flat bearing that maintains the tilt of the carriage. The
bearing provides low overall friction with the steel carriage chassis. A sintered bronze bushing impregnated with
lubricant provides both low friction levels and environmental stability with changes in temperature or humidity.
Interface oil holds the friction level constant. The oil is a synthetic, low vapor-pressure oil that is compatible with
the plastic parts and resistant to evaporation.
The carriage rocks slightly, as a function of clearance between the carriage rod and the bushing on the bottom of
the carriage, as well as the bearing at the top of the carriage. To minimize the impact of carriage rocking, relative
to the encoder system, a mylar encoder strip is positioned closely to the nozzle plate of the print cartridge. The
mylar material is resistant to fingerprints, paper dust, and so forth. It is slightly sensitive to temperature and
humidity, so a flat spring (on the right side of the steel carriage bar) maintains tension on the encoder strip.
The quadrature optical encoder and a decoupling capacitor are soldered onto the flex circuit on the rear side of the
carriage. The flex circuit comes out through the front side of the carriage, where it splits and folds over itself in
order to travel within the compact carriage path.
The flex circuit carries signals for the encoder system, as well as drive voltage for the print cartridge. Signal lines
for the print cartridge terminate at the flex-circuit contacts on the interconnect pad in the front of the carriage.
These contacts interface with contacts on the back of the print cartridge.
1.3 Print Cartridge Maintenance
The top of the carriage contains a spring latch for the print cartridge. The spring latch provides tension for
consistent snap-in of the print cartridge. The print cartridge should only be replaced when the carriage is in the
designated service position, which is controlled from the product’s front panel.
When installing a print cartridge, the bottom portion of the print cartridge should be installed into the carriage
assembly as shown in Figure 1-2. Once the bottom is seated in the carriage, push the top portion of the cartridge
toward the carriage until it snaps into place beneath the spring latch. Always ensure that the electrical contacts
inside the carriage are clean. Do not handle or touch the contacts because oil from the user’s fingers can corrode
the electrical contacts (see Figure 2-3 in section 2.1.2.1 for carriage and cartridge contact cleaning instructions).
The service station, at the left end of the carriage path, contains two wipers and two nozzle caps to provide
servicing and capping for either a monochrome or a color print cartridge (see Figure 1-3). The caps and wipers are
mounted on a rotary assembly, which incorporates a micro-switch for accurate positioning.
Copyright Samsung Electronics Company 2002
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SF-330 Series Graphic Print Ba r
Samsung Electronics Confidential
SF-330 Series Graphic Print Bar Service Guide
Service Guide
Spring latch
Wiper
Cap
Electrical
contacts
Figure 1-2. Installing the print cartridge Figure 1-3 . Service station and components
Motor
Rotary service
assembly
The service station wipes and caps the orifice plate of the print cartridge after each print job and at predefined set
points to ensure long product life. The orifice plate on the print cartridge is wiped to remove any excess ink, which
could harden and cause the nozzles to clog. The print cartridge is then capped to prevent the ink nozzles from
drying out. The cap vents into a rubber base through a vent line, so that all atmospheric interactions with the
nozzles occur through the vent (see Table 2-1 in section 2.2.2 for cartridge life information).
2 Troubleshooting
The following tools are recommended for servicing and troubleshooting the graphics print bar:
• Lint free swabs (cotton swabs are not recommended )
• Torx #'s T8 & T10 drivers
• Small flat head screwdrivers
• Needle-nose pliers
Copyright Samsung Electronics Company 2002
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SF-330 Series Graphic Print Ba r
Samsung Electronics Confidential
SF-330 Series Graphic Print Bar Service Guide
Service Guide
2.1 Print Quality
This section provides possible causes and solutions for print quality problems.
2.1.1 Poor Print Quality
Unacceptable print quality can include:
• Faded, faint, fuzzy, or smeared printout
• Inconsistent print density
• Missing dots or White Lines in Print (see section 2.1.2 )
For print quality problems, check the following:
1. The print cartridge can cause print quality problems. For print cartridge problems, see section 2.2 in this
chapter.
2. The paper can cause print quality problems.
a. Verify that the paper meets the specifications of a high quality plain paper copier media for standard
monochrome printing. If color printing is being performed on a media suited only to text printing, the
quality may be unacceptable. For high quality color printing, media that is designed for high-quality color
inkjet printing is recommended. SEE MEDIA SPECIFICATION in APPENDIX 4.3
b. Some papers that meet the paper specifications may not provide acceptable print quality. Try a different
brand or type of paper.
c. Turn the stack of paper over and try printing on the other side of the paper. (Most papers have a
recommended print side, which is identified on the paper packaging. If print quality improves, no further
troubleshooting is necessary.
Note: The product is designed to work well with most types of paper, although variables in paper
manufacturing and composition can significantly affect print quality and paper handling. Most paper
manufactured for high -quality photocopying yields good results for general monochrome printing. For
high density, high quali ty color printing, paper should be tested before large quantities are purchased,
in order to ensure desirable performance. SEE MEDIA SPECIFICATION in APPENDIX 4.3
3. Heavy concentrations of ink can cause the paper to buckle and produce smeared printouts. Try a different type
of paper specifically suited for inkjet printing which can absorb more ink when printing.
4. Ink from damp and buckled paper can leave excess ink on components in the paper path. Clean ink residue
from mechanism components if they are conta minated by wet ink.
5. Crusted ink on the print cartridge nozzles can cause smearing and missing dots (see section 2.1.2.2 about
cleaning crusted ink from the nozzles).
6. Damage to the encoder strip can cause print quality problems. Check for problems with the encoder strip and
spring. If necessary, replace affected parts (see sections 3.5 and 3.6).
Copyright Samsung Electronics Company 2002
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SF-330 Series Graphic Print Ba r
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SF-330 Series Graphic Print Bar Service Guide
Service Guide
2.1.2 Missing Dots
Figure 2-1. Example of missing dots shown as partial printed rows (white stripes) in the printout
If any rows of dots are missing on printouts (as shown in Figure 2-1), check for the following problems:
1. The print cartridge may be past its expiration date, running out of ink, or faulty. If so, replace the print
cartridge (see section 2.2 for details about print cartridge problems).
2. The print cartridge may not be making good electrical contact with the carriage assembly. Make sure that the
print cartridge is seated and pressed securely against the carriage contacts. Remove and reinstall the print
cartridge, making sure that the cartridge snaps into the carriage assembly, as shown in Figure 2-2.
Figure 2-2. Properly installed print cartridge
3. The carriage contacts or print cartridge contacts may be dirty (see section 2.1.2.1 about cleaning the electrical
contacts).
4. The print cartridge may have been stored uncapped and out of the mechanism, which can cause a severely
Copyright Samsung Electronics Company 2002
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SF-330 Series Graphic Print Ba r
Samsung Electronics Confidential
SF-330 Series Graphic Print Bar Service Guide
Service Guide
dried out, clogged nozzle. (see section 2.1.2.2 about cleaning the orifice plate and print cartridge nozzles).
If the ink cartridge is only missing a few dot rows, the cartridge may have a damaged or scratched nozzle.
If the nozzle appears scratched or damaged in any way, replace the cartridge.
5. There may be a hardware problem. Check the following:
a. The flex circuit (between the carriage assembly and the logic PBA) may not be making good contact.
Reinstall the flex circuits into connectors on the logic PBA.
b. The carriage assembly may be faulty. Check for problems with the carriage assembly. If necessary,
replace the carriage drive system. Refer to the procedure in section 0.
2.1.2.1 Cleaning the Carriage Contacts and Cartridge Contacts
1. Use only lint-free swabs moistened with water. Do not use cotton swabs.
2. Clean the contacts as shown in Figure 2-3.
Caution: Do not clean the print cartridge nozzles or orifice plate with swabs.
3. Let the contacts dry after cleaning.
4. Reinstall the print cartridge into the carriage assembly.
Figure 2 -3. Cleaning the electrical contacts on the carriage (left) and print cartridge (right)
2.1.2.2 Cleaning Crusted Ink from Print Cartridge Nozzles
Storing an uncapped print cartridge outside of the service station can cause a crust of ink on the nozzles.
Do not install an ink-crusted print cartridge into the product.
Caution
Use care during cleaning to avoid staining your hands or clothes with ink from the print cartridge.
1. Hold the print cartridge by the top of the cartridge.
Copyright Samsung Electronics Company 2002
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