Fuser Control; Fuser Control Method; Control For Warm Up Mode; Ready / Light Sleep / Deep Sleep Modes Control - Epson AcuLaser C8500 Service Manual

EPSON AcuLaser C8500

2.7.11 FUSER Control

2.7.11.1 Fuser Control Method

FUSER temperature is carried out by controlling ON/OFF of the H/R HEATER
and P/R HEATER according to FUSER control temperature.
If surface temperature of the HEAT ROLL (FUSER temperature: Detected
temperature of thermistor of TEMP. SENSOR ASSY) is higher than
FUSER control temperature, power to the H/R HEATER and P/R HEATER
is turned OFF.
If surface temperature of the HEAT ROLL (FUSER temperature: Detected
temperature of thermistor of TEMP. SENSOR ASSY) is lower than FUSER
control temperature, power to the H/R HEATER and P/R HEATER is
turned ON.

2.7.11.2 Control for WARM UP Mode

The H/R HEATER and P/R HEATER are turned ON (lamp lights) as soon as
the FUSER begins to warm-up (WARM UP mode). FUSER warm-up is
complete when FUSER temperature reaches FUSER control temperature.
FUSER control temperature at warm-up varies according to surface
temperature of the HEAT ROLL when power is ON as follows:
NOTE: FUSER control temperature at warm-up is corrected by
environment temperature (detected by ENVIRONMENT
SENSOR).
NOTE: The Heater is continuously ON after ON/OFF is repeated the
prescribed number of times when FUSER warm-up starts.
Operating Principles
2.7.11.3 READY / LIGHT SLEEP / DEEP SLEEP Modes
Control
ON/OFF control of the H/R HEATER and P/R HEATER is as follows:
Table 2-9. Ready/Light Sleep/Deep Modes Control
Operation mode
• Heater ON if FUSER temperature is lower
READ mode
• Heater OFF if FUSER temperature is at
• Heater ON if FUSER temperature is lower
LIGHT SLEEP mode
• Heater ON if FUSER temperature is at
DEEP SLEEP mode Heater always OFF.

2.7.11.4 Control in PRINTING Mode

FUSER control temperature when in PRINTING mode is established by the
setting value according to paper quality (regular / OHP film, etc.), color mode
(YMCBk mode / B/W mode), environment temperature (detected by
ENVIRONMENT SENSOR), and number of consecutive prints. H/R HEATER
and P/R HEATER are turned ON/OFF according to FUSER control
temperature.
NOTE: There are instances when the heater is forcibly turned ON/OFF
before and after the PRINTING mode.
Revision C
l
Heater ON/OFF control
than FUSER control temperature
least as high as FUSER control
temperature.
than FUSER control temperature when in
LIGHT SLEEP mode.
least as high as FUSER control
temperature when in LIGHT SLEEP mode.
2-70