Major Differences Between The C223 And The C228 - Ricoh Priport VT 6000 Service Manual

MAJOR DIFFERENCES BETWEEN THE C223 AND THE C228

1.2 MAJOR DIFFERENCES BETWEEN THE C223 AND
THE C228
No.
1 Thermal Head
2 Thermal Head Pressure
Release Mechanism
3 Improvements for Better
Master Feeding in the
Master Feed Unit
4 Paper Feed Roller
5 Paper Separation Plate
6 Paper Feed Cam and
Printing Pressure Cam
7 Paper Detection System
for Starting Applying the
Printing Pressure
8 Master Eject Roller
Item
A new 600 dpi thermal head is used.
The thermal head is pressed against the platen
roller only during the master making process. A
unique dc motor is used for this mechanism. For
details, refer to 'Master Feed' in the Detailed
Section Descriptions section.
The new master is thinner and has a smoother
surface. Some improvements have been made to
improve master feed. For details, refer to 'Master
Feed' in the Detailed Section Descriptions section.
The core of the paper feed roller has been changed
to improve paper feed. For details, refer to 'Paper
Feed' in the Detailed Section Descriptions section.
The shape of the separation plate has been
changed for better paper feeding. For details, refer
to 'Paper Feed' in the Detailed Section Descriptions
section.
For better printing quality, the shape of the printing
pressure cam (the cam profile) has been changed.
Also, the shapes of the two paper feed rollers have
been changed in order to make the paper
registration more accurate. For details, refer to
'Paper Feed' and 'Printing' in the Detailed Section
Descriptions section.
For better printing, the printing pressure application
timing has been changed. Because of the strictly
controlled timing, a photocoupler (the paper
registration sensor) is used to detect when to start
applying the printing pressure. (The paper detection
feeler used in the C223 has been removed.) For
details, refer to 'Printing' in the Detailed Section
Descriptions section.
Grooves have been made in the lower master feed
rollers to improve master feed. For details, refer to
'Master Eject' in the Detailed Section Descriptions
section.
Details
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29 January 1998