HiTi Digital Photo Printer 640PS, Service Manual

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Confidential 5
Operating System
Windows 98/ M E/ 2000/ XP
Linux & Mac OS 10.2 and above
Minimum S ystem
Requirement
Win 98/M E: 64M B RAM , Pentium PC
Win 2000/ XP: 128M B RAM, Pentium PC
Certification
UL, TUV-GS, FCC, CE, BSM I, CCC, C-Tick, VCCI
Accessories Included
Paper Cassette, USB cable, CD-ROM (with printer
drivers, bundle software and electronic manual), AC
power cord, Sample print kit (8 sheets of photo paper,
1 sheet of 4×4 sticker, 1 sheet of 4/2/4 sticker plus 1
YMCO ribbon cartridge for 10 prints
Chapter 2: Theory of Operation
Dye Diffusion Thermal Transfer (D2T2)
Dye Diffusion Thermal Transfer (D2T2) , the world’s leading technology in photo
printing processes, uses a thermal printing head (TPH) to sequentially heat three ribbon
panels that are coated with yellow, magenta and cyan dye. The heat process turns the dye
into gas that diffuses into a thin receiving layer on top of the paper. An overcoat is then
layered down on top of the paper to protect the color against water and ultraviolet rays
and to prevent it from fading.
Compared with some other photo-capable printing technologies, such as Thermal
Autochrome (Fujifilm), Variable Dot (Fujicopian) and Inkjet (Canon, Epson and HP),
Dye Diffusion Thermal Transfer
creates the most realistic photo quality. To the naked
eye it is indistinguishable from photographic prints. Its continuous-tone printing produces
256 color gradation levels in each pixel independently while other technologies, like
Variable Dot and Inkjet, have to make different dot sizes to increase the resolution in
half-tone to achieve similar effects.
The Thermal Print Head (TPH)
sequentially heats three ribbon panels
that are coated with dye in yellow,
magenta and cyan. The heat process
turns the dye into gas that diffuses into
a thin receiving layer on top of the
paper. An overcoat is then layered
down on top of the paper to protect the
color against water and ultraviolet and
to prevent it from fading.
TPH
Paper
Ribbon
Heat
Dye