Sharp AR-CF2 Service Manual page 10

6. Paper jam/error detection
A. List of Paper jams
Description
Not arrived at registration At a time of separating a sheet
sensor
Not arrived at timing At a time of leading-edge
sensor registration
Not arrived at paper exit At a time of paper exit in through
sensor mode
At a time of paper exit in normal
paper feed mode
At a time of paper exit in reverse
paper feed mode
Not arrived at reverse At a time of entering reverse
sensor section
At a time of exiting from reverse
section
Stay at registration At a time of paper exit in normal
sensor paper feed mode
At a time of entering reverse
section in reverse paper feed mode
Stay at timing sensor At a time of paper exit in normal
paper feed mode
At a time of entering reverse
section in reverse paper feed mode
Stay at paper exit sensor At a time of paper exit in through
mode
At a time of paper exit in normal
paper feed mode
At a time of paper exit in reverse
paper feed mode
Stay at reverse sensor At a time of entering reverse
section
At a time of exiting from reverse
section
B. Error detection
(1) EEPROM errors
Explanation:
1) Timeout error
The EEPROM is being programmed even after a predetermined
time period (150 msec) has passed.
2) Writing error
The written data does not match the read data even when writing
and reading are retried.
3) Reading error
Checking pieces of data read from three sources results in mis-
match even when checking is retried.
Detection timing
A paper jam is detected if the registration sensor is not turned ON, which means
absence of a sheet, even when the paper feed motor has been driven for a fixed
distance after the pickup roller starts to lower.
A paper jam is detected if the timing sensor is not turned ON, which means
absence of a sheet, even when the registration rollers (paper feed motor) have
been driven for a fixed distance after they are started.
A paper jam is detected if the paper exit sensor is not turned ON by the leading
edge of a sheet, which means absence of a sheet, even when the transport motor
has been driven for a fixed distance after the main unit sends a paper exit
command.
A paper jam is detected if the paper exit sensor is not turned ON, which means
absence of a sheet, even when the leading edge of a sheet has traveled a fixed
distance after it reaches the paper exit rollers (horizontal transport rollers 2).
A paper jam is detected if the paper exit sensor is not turned ON, which means
absence of a sheet, even when a sheet has been transported a fixed distance by
the transport motor after the reverse sensor is turned ON, which means presence
of a sheet.
A paper jam is detected if the reverse sensor is not turned ON, which means
absence of a sheet, even when the reverse motor has been driven for a fixed
distance after leading-edge registration.
A paper jam is detected if the reverse sensor is turned ON, which means absence
of a sheet, even when the reverse motor has been driven for a fixed distance
while a sheet is exiting from the reverse section.
A paper jam is detected if the registration sensor is not turned OFF, which means
presence of a sheet, even when the paper feed motor has been driven for a
predetermined amount after a sheet reaches the starting position of leading-edge
registration.
A paper jam is detected if the timing sensor is not turned OFF, which means
presence of a sheet, even when the paper feed motor has been driven for a fixed
distance after the registration sensor is turned OFF, which means absence of a
sheet.
A paper jam is detected if the paper exit sensor is not turned OFF, which means
presence of a sheet, even when the transport motor has been driven for a
predetermined amount after the paper exit sensor is turned ON, which means
presence of a sheet.
A paper jam is detected if the paper exit sensor is not turned OFF, which means
presence of a sheet, even when the transport motor has been driven for a fixed
distance after the trailing edge of a sheet reaches the paper exit rollers (horizontal
transport rollers 2).
A paper jam is detected if the reverse sensor is not turned OFF, which means
presence of a sheet, even when the reverse motor has been driven for a fixed
distance after the timing sensor is turned OFF, which means absence of a sheet.
A paper jam is detected if the reverse sensor is not turned OFF, which means
presence of a sheet, even when the reverse motor has been driven for a
predetermined amount after the reverse sensor is turned ON, which means
presence of a sheet.
AR-CF2 OPERATIONAL DESCRIPTION 4 - 6
Explanation
(2) Reverse sensor adjustment error
Explanation:
1) When the DA output exceeds the upper limit
Even when the DA output is increased, the AD input value does
not fall within the appropriated range.
2) When the DA output is less than the lower limit
Even when the DA output is decreased, the AD input value does
not fall within the appropriated range.
C. Alarm detection
Explanation:
An alarm is issued because the size of a sheet in the tray cannot be
correctly detected when both the sub tray pullout detection sensor and
the sub tray retraction detection sensor are turned OFF.
Indication:
Shown by a LED on the operator panel of the inserter or of the main
unit as an inserter alarm.