Toshiba e-STUDIO555 Service Manual page 280

Relation between IH status signal and IH errors (L: Low level, H: High level)
Checking
timing
IHERR1
Front cover L
(upper) is
closed at
power ON
On usual
L
L
L
H
H
H
H
Front cover L
(upper) is (Other than the above)
opened
e-STUDIO555/655/755/855
FUSER UNIT
Signal
IHERR2 IHERR3
L L
L H
H L
H H
L L
H H
H L
H H
L X
13 - 6
Status
Abnormality detected at
initialization
* An abnormal status is
detected at the
initialization.
Power voltage abnormality
* AC power is not
supplied to the IH
board.
Power voltage upper limit
abnormality (Surge
detection)
* AC input voltage has
exceeded 122% of the
rated voltage
Switching element (IGBT)
abnormality
* Wire breakings, short-
circuits abnormal
fluctuations or
overheating (=
insufficient cooling) of
IGBT
IH abnormality
No abnormality
Power voltage lower limit
detection (not error)
* AC input voltage has
dropped to less than
85% of rated voltage
Input current lower limit
abnormality
* Wire breakings or
improper installation of
IH coil
Power voltage lower limit
abnormality
* AC input voltage has
dropped to less than
75% of rated voltage
Power voltage abnormality
when the front cover
(upper) is opened
* An abnormal status is
detected when the
cover is opened
© 2009 - 2011 TOSHIBA TEC CORPORATION All rights reserved
Counter
Error code
(08-400)
C471 11
C472 12
C473 13
C481 14
C480 15
- -
- -
C490 17
C474 16
C475 10