Canon iR8500 - E121-0002; E202 (the Keys in the Control Panel Become Locked); E204 (the Keys in the Control Panel Become Locked)

COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001
CHAPTER 6 TROUBLESHOOTING
6-109
4.1.26 E121-0002
Foreign matter
1) Is there foreign matter that prevents the rotation of the fan around
the laser drive cooling fan?
YES: Remove the foreign matter.
Connector
2) Is the connector J503 on the DC controller PCB connected se-
curely?
NO: Connect it securely.
Laser driver cooling fan (FM5), DC controller PCB
3) Try replacing the laser driver cooling fan (FM5). Is the problem
corrected?
YES: End.
NO: Replace the DC controller PCB.
4.1.27 E202 (The keys in the control panel become locked)
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1) When ‘E202’ is indicated, is the scanner in home position?
NO: See 4.1.86 “The scanner fails to move forward.”
Connector
2) Is the connector J1702 of the relay PCB connected properly?
NO: Connect the connector properly.
Scanner home position sensor (PS1), Reader controller PCB
3) Is the scanner home position sensor (PS1) normal? (See 2.10
“Checking the Photointerrupters.”)
YES: Check the wiring from the reader controller PCB to PS1; if normal,
replace PS1.
NO: Replace the reader controller PCB.
4.1.28 E204 (The keys in the control panel become locked)
----------
1) Does the scanner move forward when the Start key is pressed?
NO: See 4.1.86 “The scanner fails to move forward.”
Image leading edge sensor (PS3), Reader controller PCB
2) (See 2.10 “Checking the Photointerrupters.”)
NO: Check the wiring form the Reader controller PCB to PS3; if nor-
mal, replace PS3.
YES: Replace the Reader controller PCB.