e-STUDIO520/600/720/850 FUSER UNIT March 2005 © TOSHIBA TEC
14 - 8
Relation between IH status signal and IH errors (L: Low level, H: High level)
Checking
timing
Signal
Status Error code
Counter
(08-400)
IHERR1 IHERR2 IHERR3
Front cover
(upper) is
closed at
power ON
L L L Abnormality detected at
initialization
* An abnormal status is
detected at the initial-
ization.
C471 11
On usual Power voltage abnormal-
ity
* AC power is not sup-
plied to the IH board.
C472 12
L L H Power voltage upper limit
abnormality (Surge detec-
tion)
* AC input voltage has
exceeded 122% of the
rated voltage
C473 13
L H L Switching element (IGBT)
abnormality
* Wire breakings, short-
circuits abnormal fluc-
tuations or overheating
(= insufficient cooling)
of IGBT
C481 14
L H H IH abnormality C480 15
H L L No abnormality - -
H H H Power voltage lower limit
detection (not error)
* AC input voltage has
dropped to less than
85% of rated voltage
- -
H H L Input current lower limit
abnormality
* Wire breakings or
improper installation of
IH coil
C490 16
H H H Power voltage lower limit
abnormality
* AC input voltage has
dropped to less than
75% of rated voltage
C474 17
Front cover
(upper) is
opened
L L X
(Other than the above)
Power voltage abnormal-
ity when the front cover
(upper) is opened
* An abnormal status is
detected when the
cover is opened
C475 10
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