Canon CLC 1120 Service Handbook page 242

CHAPTER 5 SELF DIAGNOSIS
Code
E071
5-14
Cause
• The side A sensor (PS2) is faulty.
• The side B sensor (PS3) is faulty.
• The C sensor (PS4) is faulty.
• The signal plate is faulty.
• The drum motor drive system is
subjected to an overload.
• The transfer drum locking
mechanism is faulty.
• The DC driver PCB is faulty.
• The CPU PCB is faulty.
Timing of detection
1002 The rising edge signal of the
signal plate to be detected by
the side B sensor is not
generated after the rising edge
signal of the signal plate C
detected by the C sensor has
been generated.
1003 The rising edge signal of the
signal plate C to be detected
by the C sensor is not
generated after the falling
edge of the signal plate
detected by the side B sensor
has been generated.
1004 The falling edge signal of the
signal plate C to be detected
by the C sensor is not detected
after the rising edge of the
signal plate detected by the
side B sensor has been
generated.
1005 The rising edge signal of the
signal plate to be detected by
the side A sensor is not
generated after the falling
edge of the signal plate C
detected by the C sensor has
been generated.
1006 The falling edge signal of the
signal plate to be detected by
the side A sensor is not
generated after the rising edge
of the signal plate D detected
by the C sensor has been
generated.
1007 The rising edge signal of the
signal plate D to be detected
by the C sensor is not
generated after the rising edge
signal of the signal plate
detected by the side A sensor
has been generated.
1008 The rising edge signal of the
signal plate D to be detected
by the C sensor is not
generated after the falling
edge signal of the signal plate
detected by the side A sensor
has been generated.