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367
3-5-1 Self diagnostic function
( 1 ) Self diagnostic display
This machine is equipped with a self-diagnostic function. When the machine detects a
problem with itself, it disables copying. Symbol "C" and three digits (010 - 971) indicat-
ing the content of the self diagnostic content is displayed (a part of code is not dis-
played) on the touch screen. A message requesting the user to call for service is also
displayed on the touch screen together with the telephone number preset by simulation
75.
Problems detected by the self diagnostic function are ranked A, B, C, and D according
to their contents. The motion of the machine after detection of the problem is as follows.
Rank A: The machine stops the first time the problem is detected, and also the ser-
vice call display appears.
Rank B: The service call display appears, then the machine enters partial operation
control.
Rank C: The machine self-recovers by reseting CPU so on.
If the is problem detected again after the machine self-recovers, rank A or
B motion will occur.
Rank D: Only the service call count takes place. The machine does not stop.
To clear the service call, the front cover safety switch, paper feed cover safety switch 1/
2, or eject cover safety switch are turned OFF then ON again or when the main switch is
turned OFF then ON again, after the cause of the breakdown has been removed. How-
ever, "C030" (CPU communication problem) and "C640" (fixing unit thermistor short cir-
cuit/abnormally high fixing temperature) can only be cleared by turning the main switch
OFF then ON again.
Inch Metric
Call for service. CALL FOR SERVICE.
Figure 3-5-1 Self diagnostic display
( 2 ) Partial operation control
If a problem is detected several times in succession when a certain part or function is
used, only the part or function concerned is rendered unusable. Other functions that do
not contain a problem can continue to be used.
3-5-1
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367-1
(List of self diagnostic display)
Item Code Rank C call Contents
CPU and C010 D - Backup memory data problem
peripheral C020 A o RAM read/write problem
circuit problem C030 C (A) - *1 CPU communication problem
C031 A o Scanner CPU communication problem
C032 B o RDH communication problem
C033 D - Sorter communication problem
C034 A o Sub CPU communication problem
Illumination C100 A o Exposure problem
system problem
Cool and drive C210 A o Drive motor problem
system problem C220 B o Side registration motor problem
C230 A o Image forming motor problem
C240 A o Paper feed motor problem
C253 B o Upper paper cassette lift motor problem
C254 B o Lower paper cassette lift motor problem
C255 B o Large paper deck right/left motor problem
Optical scanner C310 A o Locked scanner motor
system problem C311 A o Scanner home position switch problem
C320 A o Scanner motor problem 1
C321 A o Scanner motor problem 2
C322 A o Scanner motor problem 3
C330 A o Scanner control PCB problem 1
C331 A o Scanner control PCB problem 2
C337 A o Scanner watch dog problem
C340 A o Scanner microcomputer problem
Lens system C410 A o Lens carriage motor problem
problem C430 A o Mirror motor problem
High-voltage C510 A o Main charger problem
system problem C520 A o Abnormally high voltage of the transfer charger
belt
C550 A o Drum surface potential sensor problem 1
C551 A o Drum surface potential sensor problem 2
C560 D - Potential compensation problem 1
C561 D - Potential compensation problem 2
C570 D - Light amount compensation problem 1
C571 D - Light amount compensation problem 2
Fixing system C610 A o Broken fixing heater M