Service manual
Chapter 8
8-2
8.2 Various Control Mechanisms
8.2.1 Controlling the Temperature of the Fixing Unit
8.2.1.1 Outline
0011-4252
LaserBase MF6530 / / LaserBase MF6540PL / LaserBase MF6550 / KaserBase MF6560PL / / LaserBase MF6580PL
The fixing film unit has a plate-shaped fixing heater built into it for heating the fixing film.
The fixing heater is equipped with 2 thermistor: a main thermistor in the middle and a sub thermistor at the end. The main thermistor is used to control the temper-
ature of the fixing heater and to detect its overheating, while the sub thermistor is used to detect an error temperature on the end of the fixing heater.
The CPU on the DC controller PCB monitors the main thermistor signal (FSRTH) and the sub thermistor signal (SUBTH) from the thermistors for control of the
fixing heater drive signal (FSRD0) and the relay drive signal (RLYD), thus varying the supply of power to the heater and, ultimately, controlling the temperature
of the fixing heater.
8.2.2 Controlling the Fixing Film Temperature
8.2.2.1 Controlling the Fixing Film Temperature
0012-7188
LaserBase MF6530 / / LaserBase MF6540PL / LaserBase MF6550 / KaserBase MF6560PL / / LaserBase MF6580PL
The CPU on the DC controller PCB executes the following 6 types of fixing temperature control:
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2.Paper-present section temperature control
The fixing heater temperature is adjusted to the target paper-present section temperature according to the combination of the paper size, number of sheets fed, fixing
mode, and temperature detected by the fixing main thermistor.
3.Sheet-to-sheet temperature control
The fixing heater temperature is held relatively below the target paper-present section temperature to prevent the paper-absent section temperature from rising be-
tween sheets.
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*1Å@ëÂÉTÉCÉYÅFópéÜí²270mmà»è„ÇÃópéÜÅ@è¨ÉTÉCÉYÅF215.9mmà»â½ÇÃópéÜ
T-8-2
8.2.2.2 Target Temperatures by Mode
0012-7187
LaserBase MF6530 / / LaserBase MF6540PL / LaserBase MF6550 / KaserBase MF6560PL / / LaserBase MF6580PL
This machine controls the fixing temperature according to the "media type" selected in the user mode and the "target temperature" set in the "special mode."
The correspondence between each mode and target temperature is as follows:
T-8-3
è¨ÉTÉCÉYÉvÉäÉìÉgå„ ëÂÉTÉCÉYÉXÉãÅ[ÉvÉbÉgÉ_ÉEÉìå„
èoóÕñáêîÅiñáÅj 1Å`10 11Å`20 21Å` èoóÕñáêîä÷åWǻǵ
ÉqÅ[É^ó‚ãpéûä‘ÅiSÅj ǻǵ 5 10 10
Fixing mode Paper type Target initial fixing
temperature (*1)
Initial number of
sheets (*2)
Condition
Normal Plain paper (colored paper/
recycled paper/
label sheet (64-80 g/m2)
210 deg C 1-30 (A4/LTR) Special Mode P: OFF
195 deg C 1-30 (A4/LTR) Special Mode P: ON
Rough Paper Lo Heavy paper 1
(81-90 g/m2)
210 deg C 1-5 (A4/LTR)
Heavy paper 2
(91-105g/m2)
Rough Paper Heavy paper 3
(106-128g/m2)
215 deg C 1-5 (A4/LTR)
Postcard Postcard 215 deg C 1-5 Fix. Unit Offset: OFF
Postcard H Postcard 215 deg C 1-5 Fix. Unit Offset: 1 or 2
Envelope Envelope 215 deg C 1-5
OHP OHP 195 deg C 1-30 (A4/LTR)
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