HiTi Digital CS-200e, Service Manual

Page: 18 / 84

Confidential 18
Ribbon LED/Ribbon Sensor
Introduction:
The LED/Ribbon Sensors of CS-200e use penetration
type. These Ribbon LED and Ribbon Sensor enable
the printer to detect each definite color of the ribbon.
The new design, blue and green set of Ribbon LED’s
and Ribbon sensors, is more accurate and reliable
than ever.
Operation Theory:
The previous technology used to detect ribbon colors
is for the beam to penetrate through the ribbon onto
the sensors with different intensity of light like the table
below, signals can be recognized by the ASIC.
Y M C K O
G
Hi Lo Lo Lo Hi
B
Lo Lo Hi Lo Hi
In CS-200e, the way to determine color frame of the ribbon is by using two of LED’s/Sensors. Due to
differences of LED colors, the ribbon sensor detects different high/ low value to locate the beginning of
Y.
This printer also detects the color of ribbon frame while printing the previous frame. This means when
it’s printing Yellow frame, its actually detecting Magenta fame at the time.
Ribbon LEDs
Ribbon sensors