Canon CLC 1120 Service Handbook page 244

CHAPTER 5 SELF DIAGNOSIS
Code
E071
5-16
Cause
• 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.
Timing of detection
1108 The rising edge signal of the
signal plate D 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 A sensor
has been generated.
1201 The falling edge signal of the
signal plate to be detected by
the side B sensor is generated
10 ms later after the falling
edge signal of the signal plate
D detected by the C sensor
has been generated.
1202 The rising edge signal of the
signal plate to be detected by
the side B sensor is generated
10 ms later after the rising
edge signal of the signal plate
C detected by the C sensor has
been generated.
1203 The rising edge signal of the
signal plate C to be detected
by the C sensor is generated
10 ms later after the falling
edge signal of the signal plate
detected by the side by side B
sensor has been generated.
1204 The falling edge signal of the
signal plate C to be detected
by the C sensor is generated
10 ms later after the rising
edge signal of the signal plate
detected by the side B sensor
has been generated.
1205 The rising edge signal of the
signal plate to be detected by
the side A sensor is generated
10 ms later after the falling
edge signal of the signal plate
C detected by the C sensor has
been generated.
1206 The falling edge signal of the
signal plate to be detected by
the side A senor is generated
10 ms later after the rising
edge signal of the single plate
D detected by the C sensor
has been generated.