Read Sharp MX-6500N / MX-7500N (serv.man27) Service Manual online
MX-7500N OPERATIONAL DESCRIPTIONS 13 – 48
(3)
Fusing operation
Color toner (Y, M, C, and K) on paper is heated and pressed by the
fusing belt, fusing roller (F2), and fusing roller (B) to be fused on
paper.
fusing belt, fusing roller (F2), and fusing roller (B) to be fused on
paper.
Toner in the four layers on the paper is fused by heating from up
and down and both sides.
and down and both sides.
The fusing belt, fusing roller (F2) which is provided with the cushion
layer, and fusing roller (B) realize the following operations.
layer, and fusing roller (B) realize the following operations.
1)
The nip amount is increased and the heat capacity to paper is
increased.
increased.
2)
By pressing with the flexible roller, toner of many layers can be
fused without being deformed.
fused without being deformed.
3)
An even pressure is applied to rough surface of toner (due to
the multi-layer composition).
the multi-layer composition).
(4)
Automatic pressure release system
Normally the upper and lower heat rollers are pressed. When, how-
ever, the following conditions are satisfied, the pressure is
released.
ever, the following conditions are satisfied, the pressure is
released.
- When the machine shifts to the preheat mode.
- When the machine shifts to the auto power shut off mode.
- When the power switch of the operation panel is turned OFF.
- When the machine is left for 90 sec under the ready state.
- When in the envelope mode.
- When a jam occurs.
a. Pressure release operation
The fusing pressure control motor (PRM) rotates to turn ON the
fusing pressure detector (HLPCD) (H level). When the specified
time passes after turning ON the fusing pressure detector (HLPCD)
(H level) by rotation of the fusing pressure control roller (PRM), the
pressure release motor stops to complete the pressure release
operation.
fusing pressure detector (HLPCD) (H level). When the specified
time passes after turning ON the fusing pressure detector (HLPCD)
(H level) by rotation of the fusing pressure control roller (PRM), the
pressure release motor stops to complete the pressure release
operation.
b. Pressing operation
When the end user makes some operations or when the machine
receives the Job signal, the fusing pressure control motor (PRM)
rotates reversely to drive the pressure release lever to the pressing
state.
receives the Job signal, the fusing pressure control motor (PRM)
rotates reversely to drive the pressure release lever to the pressing
state.
When the specified time passes from turning OFF the fusing pres-
sure detector (HLPCD), the pressure release motor stops to com-
plete the pressing operation.
sure detector (HLPCD), the pressure release motor stops to com-
plete the pressing operation.
When turning OFF the main power switch of the machine, be sure
to turn OFF the power switch of the operation panel and check to
confirm that the LCD display goes off before turning OFF the main
power switch.
to turn OFF the power switch of the operation panel and check to
confirm that the LCD display goes off before turning OFF the main
power switch.
If the main power switch is turned OFF with the LCD lighted, the
power is cut off before completion of the pressure release opera-
tion. If this state is kept for a long time, the fusing roller may be
deformed.
power is cut off before completion of the pressure release opera-
tion. If this state is kept for a long time, the fusing roller may be
deformed.
Fusing roller
(B)
(B)
Fusing roller (F2)
Fusing belt
Fusing roller (B)
Fusing roller
(F2)
(F2)
Fusing belt
HLPCD
HLPCD
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