Service manual
Chapter 8
8-3
*1: Target fixing temperature at startup. When the initial temperature of the fixing unit is high, the target temperature is lowered. In the continuous copy mode, the
target temperature is lowered.
*2: Number of sheets controlled at the initial target temperature. If it is exceeded, the target temperature is lowered. The prescribed number of sheets varies with
the paper size.
8.3 Protection Function
8.3.1 Outline
0011-4250
LaserBase MF6530 / / LaserBase MF6540PL / LaserBase MF6550 / KaserBase MF6560PL / / LaserBase MF6580PL
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If the temperature of the fixing heater increases abnormally, on the other hand, to exceed about 228°C, the thermal fuse will melt to cut the power to the fixing heater.
F-8-3
8.3.2 Failure Detection
0011-4251
LaserBase MF6530 / / LaserBase MF6540PL / LaserBase MF6550 / KaserBase MF6560PL / / LaserBase MF6580PL
The CPU on the DC controller PCB will identify a fault in the fixing assembly if any of the following conditions (a through d) occurs; as a result,
- it will cut the power to the fixing heater.
- it will cause the relay drive signal (RYLD) to go '1' to turn off the relay and, at the
same time, will communicate the presence of a fault to the image processor PCB.
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P1
NF NF
ASIC
J14
-12
J103
-3RLYD
FSRDRV-13 -2
J14
-14
J103
-1ZEROX
AC
DC
F1 F2
SW1
J113
GND
SUBTH
-4
-3
GND
MAINTH
-2
-1
+3.3V, +5V, +24V
J15
-1
-3
TH1TH2
TP101
-2
-1
RL1
H1
J25
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