Ih Control Circuit Interface - Toshiba e-STUDIO453 Service Manual

13.4.3 IH control circuit interface

The IH control circuit uses a photocoupler as an insulation against the secondary circuit.
The interface signals are as follows.
CN No.
CN455-1
CN455-2
CN455-3
CN455-4
CN455-5
CN455-6
CN455-7
CN455-8
CN456-1
CN456-2
CN456-3
CN456-4
CN456-5
(*Note) IH status signal
• When the temperature (due to insufficient cooling) of the switching element (IGBT) is abnormal:
"10: Coil is abnormal, IH FAN OFF" → After a certain period of time → Error [C480]
13
• When the upper limit of the power voltage is abnormal: "00: Initializing" → After a certain period
of time → Error [C470]
• When the lower limit of the power voltage is abnormal: "00: Initializing" → After a certain period
of time → Error [C470]
• Defective circuits → : "11: Abnormal circuit, IH coil abnormality" → Error [C490]
• Ready state after the initialization: "01: Ready"
e-STUDIO350/352/353/450/452/453
FUSER UNIT / PAPER EXIT SECTION
Name of signal Direction
IH2 ON
VDD
H1PWR1
H1PWR2
LGC to IH
H1PWR3
H2PWR1
H2PWR2
H2PWR3
IH1 ON
LGC to IH
SG
NC -
H1ERR1
IH to LGC
H1ERR2
Definition
IH coil energization permitting signal
Switching signal of power setting
IH coil energization permitting signal
Not connected
IH status signal (*Note)
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