13

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.

Name of signal

Direction

Definition

 

 

 

 

CN455-1

IH2 ON

 

IH coil energization permitting signal

 

 

 

 

CN455-2

VDD

 

 

 

 

 

 

CN455-3

H1PWR1

 

 

 

 

 

 

CN455-4

H1PWR2

LGC to IH

 

 

 

Switching signal of power setting

CN455-5

H1PWR3

 

 

 

 

 

CN455-6

H2PWR1

 

 

 

 

 

 

CN455-7

H2PWR2

 

 

 

 

 

 

CN455-8

H2PWR3

 

 

 

 

 

 

CN456-1

IH1 ON

LGC to IH

IH coil energization permitting signal

 

 

 

CN456-2

SG

 

 

 

 

 

 

 

CN456-3

NC

-

Not connected

 

 

 

 

CN456-4

H1ERR1

IH to LGC

IH status signal (*Note)

 

 

CN456-5

H1ERR2

 

 

 

 

 

 

(*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]

•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

13 - © 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved

FUSER UNIT / PAPER EXIT SECTION

 

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Toshiba 452, 453, 350, 353 service manual IH control circuit interface, IH2 on, Vdd, IH1 on
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350, 353, 453, 452 specifications

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