Ricoh LDD250, Service Manual

Page: 254 / 459

ELECTRICAL COMPONENT DEFECTS
C262/C265 4-20 SM
Name State Symptoms
Does not detect paper,
but there is paper. The machine displays “upper wrapping
jam”, when a lower wrapping jam occurs.
4.4.9 PAPER SEPARATION
Name State Symptoms
Stays on (detects the
slider, but it not there) If the sensor does not turn off, SC511
occurs. Slider position sensor
Stays off (does not detect
the slider, but it is there). If the sensor does not turn on when the
Start button is pushed, SC511 occurs
during printing.
Stays on (detects that the
slider touched the paper,
but it did not touch the
paper) If the sensor does not turn off, SC508
occurs. Paper sensor
Stays off (does not detect
the surface of paper) If the sensor does not turn on, SC508
occurs.
Stays on (detects the
slider, but it is not at
home position) If the sensor does not turn off, SC510
(slider lift motor lock) occurs. Slider HP sensor
Stays off (does not detect
the slider, but it is at
home position) If the sensor does not turn on, SC510
(slider lift motor lock) occurs.
Stays on (detects the
slider, but it is not at the
upper limit position.) If the sensor does not turn off, SC509
occurs. Slider upper limit
sensor
Stays off (does not detect
the slider, but it is at the
upper limit position) If the sensor does not turn on, SC509
occurs.
4.4.10 FUSES ON BOARDS
Name State Symptoms
F700
(PSU) Open The power supply does not turn on.
F703 and F704
6.3A (PSU) Open SC300: Main motor lock
F701 and F702
6.3A (PSU) Open 24V is cut off
SC300: Main motor lock
F1
12A (Main motor
control board) Open SC300: Main motor lock
NOTE: F701 and F702, F703 and F704 are connected in parallel to protect the
board. If one fuse is broken, the machine works if the other fuse does not
break. But replace the broken fuse as soon as possible.