AR-CF2 (serv.man2). Service manual - Sharp Copying Equipment Service Manual (repair manual). Page 10

AR-CF2  OPERATIONAL DESCRIPTION  4 - 6

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.

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.

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.

Description

Detection timing

Explanation

Not arrived at registration 
sensor

At a time of separating a sheet

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.

Not arrived at timing 
sensor

At a time of leading-edge 
registration

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.

Not arrived at paper exit 
sensor

At a time of paper exit in through 
mode

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.

At a time of paper exit in normal 
paper feed mode

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). 

At a time of paper exit in reverse 
paper feed mode

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.

Not arrived at reverse 
sensor

At a time of entering reverse 
section

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.

At a time of exiting from reverse 
section

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.

Stay at registration 
sensor

At a time of paper exit in normal 
paper feed mode

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.

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

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.

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

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.

At a time of paper exit in normal 
paper feed mode

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).

At a time of paper exit in reverse 
paper feed mode

Stay at reverse sensor

At a time of entering reverse 
section

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.

At a time of exiting from reverse 
section

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.