Canon CLC 1120 Service Handbook page 243

Code
• The side A sensor (PS2) is faulty.
E071
• 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.
• Side A sensor (PS2) is faulty.
• 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 is not locked
properly.
• The DC driver PCB is faulty.
• The CPU PCB is faulty.
Cause
CHAPTER 5 SELF DIAGNOSIS
Timing of detection
1101 The falling edge signal of the
signal plate to be detected by
the side B sensor is generated
10 ms earlier after the falling
edge signal of the signal plate
D detected by the C sensor
has been generated.
1102 The rising edge signal of the
signal plate to be detected by
the side B sensor is generated
10 ms earlier after the rising
edge signal of the signal plate
C detected by the C sensor has
been generated.
1103 The rising edge signal of the
signal plate C to be detected
by the C sensor is generated
10 ms earlier after the falling
edge signal of the signal plate
detected by the side B sensor
has been generated.
1104 The falling edge signal of the
signal plate C to be detected
by the C sensor is generated
10 ms earlier after the rising
edge signal of the signal plate
detected by the side B sensor
has been generated.
1105 The rising edge of the signal
plate to be detected by the
side A sensor is generated 10
ms earlier after the falling
edge signal of the signal plate
C detected by the C sensor has
been generated.
1106 The falling edge signal of the
signal plate to be detected by
the side A sensor is generated
10 ms earlier after the rising
edge signal of the signal plate
D detected by the C sensor
has been generated.
1107 The rising edge signal of the
signal plate D to be detected
by the C sensor is generated
10 ms earlier after the rising
edge of the signal l plate to be
detected by the side A sensor
has been generated.
5-15