salee Deskjet Notes 3
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Transcript of salee Deskjet Notes 3
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[email protected] WWW.UNLIMITEDTIPS4ALL.BLOGSPOT.IN
PRINTERS
IMPACT PRINTERS
NON IMPACT PRINTERS
IMPACT PRINTER:
Dot Matrix printers
Ledger Printers 80 & 136 column printer
Retail Printer (40 column & below)Major companies are WIPRO, TVSE and EPSON
Line Matrix Printer:
Section deals with
Power section (SMPS)
Logic card section (motor & PH)
Carriage section
Paper feed section
Print head section
Sensor Problems
NON IMPACT PRINTER:
Inkjet / Desk-jet
Power section (SMPS)
Carriage section
Paper feed section
Service station
Ink cartridges Refill/ Print head LASER PRINTER:
Power section
LASER section
Logic card
Toner Cartridges
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Refilling
Sensors
Fuser Section
Teflon Replace
Paper pickup section SCANNER
Assembling & de-assembling mechanisms of all types of printers
INKJET PRINTER / DESKJET PRINTER
Printer supports graphics with colors (c m y k )
C- CYAN M-MAJENTA Y-YELLOW K-BLACK
Speed ppm:- pages per minute (12ppm)
Quality dpi dots per inch:- 600dpi
Types of cartridges
1) Cartridge with head
2) Cartridge without head
3) CISS (contunies ink supply system)
Parts of printer
Electronics Mechanical
Main PCB Carriage Section
Print Head Driving PCB Paper Feed Mechanisum
Power Supply Service Station
Sensors Home Position
Motors Encoder Strips
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Encoder strips Two types
1) Strip type
2) Disk type
INKJET PRINTER PRINTING PROCESSES
Two types of printing processes
1:- piezoelectric technology
2:- thermal technology
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Thermal technology:-
In this processes the ink in the nozzle Is heated till it is expands and
propelled out of the nozzle. As the ink comes out of the nozzle, it gets
cooled down and falls on the paper forming a tiny dot on the paper. To
control the temperature of the print head, it is divided into two stages.
(i) ON DOT PULSE WARMING METHOD.
(ii) OFF DOT PULSE WARMING METHOD.
ON DOT PULSE WARMING METHOD:-
In this process, the ink in the chamber is heated till it
expands and comes out of the nozzle. As the ink comes out, it stops
heating.
OFF DOT PULSE WARMING METHOD
In this process, when the ink is coming into the
chamber, it absorbs the heat surrounding it which helps to control the
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temperature of the print-head. As the ink comes into the chamber, it starts
heating again.
