Fuser Unit Use Status Determining Circuit - Toshiba e-STUDIO2500c Service Manual

15.5.4

Fuser unit use status determining circuit

The fuser unit fuse is installed in the fuser unit. The fuser unit use status determining circuit determines
whether a fuser unit is new or used by detecting the status of the fuse. In addition, when the circuit
detects that a new fuser unit is connected, it supplies current to blow out the fuser unit fuse to clear the
fuser-related life counters.
LGC board
FUSCRU-0C
IC56
ASIC
FUSCUT
24VCHK
Control signal
Signal
FUSCRU-0C Fuser unit use status Determining
signal
FUSCUT Fuser unit fuse blow-out signal
24VCHK Cover opening/closing detection
signal (24 V direct current detec-
tion signal)
Notes:
• A C4C0 error occurs when the fuser unit fuse is not blown out even if the fuser unit use status
determining circuit has determined that the fuser unit connected is new.
• When a new fuser unit is installed, be sure to check whether the fuser-related life counter val-
ues have been cleared in the list printing mode, PM supporting mode or the setting mode
(08). When they are not cleared, check that the value of the code 08-4549 is set at "0". If the
value is "1", turn the power OFF and then back ON after changing the value to "0", and then
check the counter values again.
• Life counters to be cleared at blow-out of the fuser unit fuse are shown below.
- Pressure roller
- Pressure roller separation finger
- Fuser belt
- Fuser roller
- Fuser belt guide
e-STUDIO2500c/3500c/3510c FUSER UNIT / PAPER EXIT SECTION
+12VB
+5VSW
Q22
SG
Fig. 15-8
Function
08-1250
08-1270
08-1272
08-1274
08-1276
15 - 16
+5.1VB
Q201
FUSCRU-0A
SG
SG
Status
High level
Used
OFF
Cover closed
Fuser unit
Fuser unit fuse
Low level
New
ON (Fusing)
Cover opened
May 2006 © TOSHIBA TEC