Fuser Skidding; Prevention Of A Fuser Nip Scar; Main Fuser Assy Life Detection Control - Epson AcuLaser C8500 Service Manual

EPSON AcuLaser C8500

2.7.11.5 FUSER skidding

When the heat distribution of HEAT ROLL and PRESSURE ROLL is not
uniform because a problem comes out in the fixation performance, the
movement that it is called FUSER skidding occurs.
FUSER skidding turns HEAT ROLL and PRESSURE ROLL by the drive of
FUSER MOTOR ASSY.
WARM UP mode
FUSER skidding is done from the regulation time before the warm-up
completion of FUSER until the regulation time after the completion.
READY mode
FUSER skidding is done for about 0.5 seconds in about 1 minute.

2.7.11.6 Prevention of a FUSER NIP scar

When it keeps touching each other in the position where PRESSURE ROLL is
the same as HEAT ROLL, the contact part of HEAT ROLL and PRESSURE
ROLL is transformed, and it becomes a difference in pressure in the result
fixation, and an influence appears in the print image quality.
The following is done to prevent this.
Power OFF/DEEP SLEEP mode
Because there is no swelling of HEAT ROLL and PRESSURE ROLL by the
heat of H/R HEATER and P/R HEATER, it is preventing the interval of
HEAT ROLL and PRESSURE ROLL from becoming less than a constant
distance physically. (On this occasion, pressure between HEAT ROLL and
PRESSURE ROLL is hardly added.)
READY/LIGHT SLEEP mode
HEAT ROLL and PRESSURE ROLL expand by the heat of H/R HEATER
and P/R HEATER, because it becomes the condition that it gains fixed
pressure and the contact position of HEAT ROLL and PRESSURE ROLL
is changed by doing FUSER skidding for about 0.5 seconds in about every
1 minute.
Operating Principles

2.7.11.7 MAIN FUSER ASSY Life Detection Control

Life detection
The life of the MAIN FUSER ASSY is affected by the number of sheets of
the print to be fixed. Detect life of MAIN FUSER ASSY by the count added
at the time of printing. Though the life of MAIN FUSER ASSY is "100,000
count", this is for the value by the regulation condition, warning value/limit
value is established as the following.
Table 2-10. MAIN FUSER ASSY Life Detection Control
MAIN FUSER ASSY life warning. 99,999,999 count
MAIN FUSER ASSY life limit.
NOTE: Count is a cumulative total that is incremented by 1 when length of
paper in the paper transport direction is 219mm (LETTER [LEF]) or
less, and incremented by 2 when the size of the paper exceeds
219mm (LETTER [LEF]).
Procedures when replacing
Do the following treatment when exchanging MAIN FUSER Assy for new
one.
NOTE: After replacing with a new MAIN FUSER ASSY, perform "Counter
Clear".
NOTE: "Counter Clear" is when a command is sent from the printer
controller or diagnostics to reset the life counter corresponding to
various error / status code inside the MCU PWB to zero. (For
details, see Chapter 3 "Diagnostic Procedure".)
Revision C
.
Value
(standard value)
99,999,999count
(standard value)
2-71