Table of Contents
Advertisement
SS) OPERATIONS AND TIMING £5
Sis
4.
Protection Mechanisms
The copier is equipped with the following
protection mechanisms to prevent malfunc-
tion of the fixing heater.
a.
The microprocessor monitors the volt-
age
of
TH1,
and
displays
'Eo'
(PC320/325/FC230)/ 'Jam' (PC300/
FC210) and turns the power off upon
detection of any of the following condi-
tions:
i. The temperature of the fixing heater
does not reach 80°C 2.5 sec after
copying starts.
ii. The temperature of the fixing heater
does not reach 150°C within 7.5 sec
after copying starts.
iii. The temperature of the fixing heater
drops to 135°C or less after it has
reached 150°C.
iv. The temperature of the fixing heater
rises in excess of 215°C.
v.The
maximum
power
(400 W) is
detected for 5 sec continuously after
the temperature of the fixing heater
has reached 150°C.
b.
TH1 registers 234°C as the temperature
of the fixing heater; as a result, the fixing
heater error temperature detection cir-
cuit causes RELAYD to go '0' and the
relay (RL101) to go OFF, thereby cutting
the power to the fixing heater.
c.
The thermal fuse (FU2) blows after it
has reached 228°C and a specific time
has passed to cut off the power to the
fixing heater.
- Quick Links:
- Basic Operations
Hide quick links:
Advertisement
Table of Contents
