Canon CLC 1120 Service Manual page 862

Code
E020
COPYRIGHT © 1999 CANON INC.
Cause
The backup data on the CPU PCB is
faulty* or the initial settings have
not been made.
*Be sure to initialize the RAM of the
DC-CPU and enter the values
recorded on the service label.
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 13 TROUBLESHOOTING
Timing of detection
xx63 During copying sequence, the
level of PT-SIG-M/C/Y is
'683' or less or that of PT-SIG-
K is '305' or less because of an
error in the memory backup
data.
xx64 During copying sequence, the
level of PT-REF-D is '777' or
less because of an error in the
memory backup data.
xx65 During copying sequence, the
level of PT-SIG-D is '573' or
less because of an error in the
memory backup data.
xx66 During copying sequence, the
level of D-M-TRGT/D-C-
TRGT/D-Y-TRGT (developer
target value) is '700' or less
because of an error in the
memory backup data.
xx70 During copying sequence, the
level of SGNL-M/C/Y set
initially is '859' or more
because of an error in the
memory backup data.
xx71 During copying sequence, the
level of REF-M/C/Y set
initially is '930' or more
because of an error in the
memory backup data.
xx72 During copying sequence, the
level of PT-REF-M/C/Y/K set
initially is '859' or more
because of an error in the
memory backup data.
xx73 During copying sequence, the
level of PT-SIG-M/C/Y set
initially is '749' or more or that
of PT-SIG-K is '371' or more
because of an error in the
memory backup data.
xx74 During copying sequence, the
level of PT-REF-D set initially
is '859' or more because of an
error in the memory backup
data.
xx75 During copying sequence, the
level of PT-SIG-D set initially
is '655' or more because of an
error in the memory backup
data.
13-335