8–1
SELF DIAGNOSIS
CHAPTER 8
SELF DIAGNOSIS
The microprocessor on the machine’s DC con-
troller is provided with a self diagnosis mechanism
which checks the condition of the machine (sensors
in particular) and indicates a code to identify the
error it detects.
Detecting an error associated with ‘E000’ will
automatically turn OFF the power. (error auto power-
off)
A. Copier Self Diagnosis
Code
Description
• The detection temperature of the main
thermistor (TH1) does not reach 50°C 15 sec
after a press on the Copy Start key.
• The detection temperature of the main
thermistor (TH1) exceeds 225°C during
copying/stand-by.
• The detection temperature of the main
thermistor (TH1) does not reach 155°C 25
sec after it has reached 50°C during copying.
• The detection temperature of the main
thermistor (TH1) is less than 50°C after it has
reached 155°C during copying.
The activation of fixing heater (HTON=1) is
detected when the fixing heater drive signal is
OFF (HTRD=0).
The revolution of the main motor deviates from
the specified value (MLOCK=0) for 1 sec or
more while the main motor drive signal remains
ON (MMD=1).
A check is made immediately before the
counter turns ON or OFF and when starting the
count.
Normal if the drive signal is ‘0’ when the
counter turns ON. Normal if the drive signal is
‘0’ when the counter is OFF.
Note: The check is made only if the counter is
installed.
Possible cause
• Thermistor (TH1; displacement,
poor contact, short circuit)
• Fixing heater (H1; open circuit,
cracking)
• Thermal fuse (FU1; malfunction)
• DC controller (faulty)
• Thermistor (TH1; short circuit)
• Triac (faulty)
• DC controller (faulty)
• Thermistor (TH1; displacement,
poor contact, open circuit)
• Fixing heater (H1; open circuit,
cracking)
• Thermal fuse (FU1; activation)
• Triac (faulty)
• DC controller (faulty)
• Thermistor (TH1; displacement,
poor contact)
• Fixing heater (H1; open circuit,
cracking)
• Thermal fuse (FU1; activation)
• Triac (faulty)
• DC controller (faulty)
• Triac (faulty)
• Heater ON PCB (faulty)
• Main motor (M1; faulty)
• DC controller (faulty)
• Counter (open circuit)
• DC controller (faulty)
E001
E000
E002
E003
E030
E004
E010
Summary of Contents for NP6621
Page 4: ...ii ...
Page 8: ...vi ...
Page 48: ...3 2 IMAGE FAULTS ...
Page 49: ...3 3 IMAGE FAULTS NOT USED ...
Page 50: ...3 4 IMAGE FAULTS B Image Fault Samples not available ...
Page 80: ...4 16 TROUBLESHOOTING MALFUNCTIONS ...
Page 134: ...A 4 APPENDIX ...
Page 135: ...A 5 APPENDIX C GENERAL CIRCUIT DIAGRAM not available ...
Page 136: ...A 6 APPENDIX ...
Page 144: ...A 14 APPENDIX ...