Ih Control Circuit Interface; Abnormality In The Ih Control Circuit - Toshiba e-STUDIO555 Service Manual

13.4.3

IH control circuit interface

The IH control circuit uses a photocoupler as an insulator against the secondary circuit.
The interface signals are as followed.
Connector No. Signal
CN455-1 IH2ON
CN455-2 +5VSW
CN455-3 H1PWR1
CN455-4 H1PWR2
CN455-5 H1PWR3
CN455-6 H2PWR1
CN455-7 H2PWR2
CN455-8 H2PWR3
CN455-9 IH1ON
CN455-10 SG
CN455-11 IHDUTY
CN455-12 IHERR1
CN455-13 IHERR2
CN455-14 IHERR3
13.4.4

Abnormality in the IH control circuit

When an abnormality is detected in the IH control circuit, it stops the power supply to the IH coil and
displays a message "call for service".
LGC board
IC56
ASIC
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Direction
LGC board to IH board
IH board to LGC board
IH board
+5VSW
H1ERR1-0
H1ERR2-0
H1ERR3-0
Fig. 13-5
13 - 5
Definition
IH coil energization permitting signal
-
Switching signal of power setting
IH coil energization permitting signal
-
Duty ratio changing signal
IH status signal
Vcc
CPU
e-STUDIO555/655/755/855
13
FUSER UNIT