Ricoh C231 Service Manual page 306

Rev. 07/2001
4.4 ROM HISTORY
4.4.1 C237 FIRMWARE MODIFICATION HISTORY
DESCRIPTION OF MODIFICATION
This is the first mass production.
Improved the paper registration when the
machine feeds paper at 130 rpm.
Corrected the image position failure when the
'combine 2 original mode' is used. (Main ROM)
To ensure paper registration at 130 rpm, paper
feed timing was changed. (Feed ROM)
Modified because the counter on the operation
panel returns to the previous value when the
machine stopped because of a problem (e.g. jam
during a copy job).
This version causes problems and should not be
used.
Refer to version H history for the problem.
The specification of the 'Combine 2 original mode'
for U.S. version models was changed from 'LT x
LT = LG 77%' to 'LT x LT = LT 65%'.
The specification of the 'Combine 2 original mode'
was changed to fit between the paper centerline
and the image centerline, and 5 mm at the leading
edge image was cut (see Remark 1 on the next
page).
The motion time of the pressure plate motor has
been changed from 2.8 ms to 1.8 ms, to prevent
the motor on master eject section has a load a
long term.
NOTE: This issue is related to the U.S. version
models only.
C231/C237/C238
C237 FIRMWARE MODIFICATION HISTORY
LEVEL
Main ROM:
C237 5105-B
Feed ROM:
C237 5107-A
MPU:
C237 5100-B
Main ROM:
C237 5105-B
Feed ROM:
C237 5107-B
C237 5100-C
Main ROM:
C237 5105-C
Feed ROM:
C237 5107-C
C237 5100-D
Main ROM:
C237 5105-D
Feed ROM:
C237 5107-C
C237 5100-F
Main ROM:
C237 5105-F
Feed ROM:
C237 5107-C
C237 5100-J
4-16
ROM HISTORY
REV. SERIAL
NUMBER
Production
July 2000
Production
MPU:
August 2000
Production
MPU:
September
Production
MPU:
October 2000
Production
MPU:
Initial
2000
SM