Panasonic KX-MC6020RU / KX-FAP317A / KX-FAB318A Service Manual ▷ View online
125
KX-MC6020RU
printed on the paper. The registration sensor detects whether the sheet of paper arrived at the registration roller after being properly
picked and traveling through the paper feed rollers in the optional lower Input tray.
picked and traveling through the paper feed rollers in the optional lower Input tray.
The paper feed unit has the standard paper cassette paper empty and registration sensors. The standard paper cassette has the
MPT paper empty sensor for multi-purpose tray and the paper size detection levers. The standard paper cassette paper empty sen-
sor detects whether the paper is set in the standard paper cassette. The paper size detection levers are used for detecting paper
size and whether the standard paper cassette is installed in the printer. The MPT paper empty sensor detects whether the paper is
set in the MPT tray.
MPT paper empty sensor for multi-purpose tray and the paper size detection levers. The standard paper cassette paper empty sen-
sor detects whether the paper is set in the standard paper cassette. The paper size detection levers are used for detecting paper
size and whether the standard paper cassette is installed in the printer. The MPT paper empty sensor detects whether the paper is
set in the MPT tray.
6.20.4.6. Toner Transfer to Paper
Once all four layers of toner reside up on the accumulator belt, the registration roller clutch is energized to advance a sheet of paper
(which has already been picked) to the second transfer roller. The toner image on the rotating accumulator and the paper that is
being fed into the image unit are synchronized for proper alignment. The leading edge of toner image on the accumulator belt is
aligned 4 mm from the leading edge of the paper. A strong positive voltage in the second transfer roller attracts the toner from the
accumulator belt to the paper. The second transfer roller voltage is approximately +1400 volts. This voltage varies depending on
the ambient temperature, humidity, print speed and media being printed upon. The paper (or transparency film) advances at the
same speed as the accumulator belt.
(which has already been picked) to the second transfer roller. The toner image on the rotating accumulator and the paper that is
being fed into the image unit are synchronized for proper alignment. The leading edge of toner image on the accumulator belt is
aligned 4 mm from the leading edge of the paper. A strong positive voltage in the second transfer roller attracts the toner from the
accumulator belt to the paper. The second transfer roller voltage is approximately +1400 volts. This voltage varies depending on
the ambient temperature, humidity, print speed and media being printed upon. The paper (or transparency film) advances at the
same speed as the accumulator belt.
As the toner is being transferred to the paper, the accumulator belt cleaning blade is activated. This blade scrapes any remaining
traces of toner from the accumulator belt prior to the next image transfer. The scraped toner is discharged to the waste toner car-
tridge by the spiral paddle shaft.
traces of toner from the accumulator belt prior to the next image transfer. The scraped toner is discharged to the waste toner car-
tridge by the spiral paddle shaft.
126
KX-MC6020RU
6.20.4.7. Fusing
After toner image has been applied to the paper, it passes through the fuser. When the BK motor starts to rotate, the Halogen Lamp
is turned on, heating the heat roller. As a result, the fuser belt, contacted with the heat roller surface, is heated by the heat roller. A
heated fuser belt melts the toner and pressure drives it into the paper. The melted toner bonds to the paper. After fusing, the paper
advances to the output tray. When the printer is idle, the Halogen Lamp is turned off and the fuser belt is not heated. At the 600 dpi
printing mode, the fuser belt is set to approximately 172
is turned on, heating the heat roller. As a result, the fuser belt, contacted with the heat roller surface, is heated by the heat roller. A
heated fuser belt melts the toner and pressure drives it into the paper. The melted toner bonds to the paper. After fusing, the paper
advances to the output tray. When the printer is idle, the Halogen Lamp is turned off and the fuser belt is not heated. At the 600 dpi
printing mode, the fuser belt is set to approximately 172
°C. This fuser belt temperature varies depending on 1200 dpi printing mode,
thick paper printing mode, transparency printing mode, etc. The fuser unit has the paper ejection sensor, which detects the sheet of
paper as it leaves the fuser.
paper as it leaves the fuser.
127
KX-MC6020RU
6.20.4.8. Paper Exit and Paper Switchback
6.20.4.8.1. Normal Printing Mode (Not Duplex Printing Mode)
After fusing, paper is fed to the output tray by the paper exit roller. Rotation from the BK motor is transmitted to the double teeth
gear. The rotation of double teeth gear is transmitted to the paper exit roller gear through intermediate gears in order of numbers (1
- 7). The arrows indicate the rotation direction of each gear.
The Paper is ejected face down and stored in the output tray.
gear. The rotation of double teeth gear is transmitted to the paper exit roller gear through intermediate gears in order of numbers (1
- 7). The arrows indicate the rotation direction of each gear.
The Paper is ejected face down and stored in the output tray.
128
KX-MC6020RU
6.20.4.8.2. Duplex Printing Mode (Paper Switchback)
The switchback solenoid is turned off by the time the top edge of paper passes by the paper jam sensor on the fuser unit. The
switching lever engages with the switching gear-A, and the rotation of rotation switching gear-A is locked. As a result, the rotation
from the BK motor is transmitted to the paper exit roller in order of numbers (1 - 7) through the double teeth gear. The arrows indi-
cate the rotation direction of each gears.
This advances the sheet of paper between the paper exit roller and switchback pinch roller. The paper is fed to the output tray by
the paper exit roller and pinch roller. At the proper time, the switchback solenoid is turned on. The rotation switching gear-B is
locked by the switching lever, and the rotation from the BK motor is transmitted to the paper exit roller in order of numbers (1 - 7)
through the double teeth gear. As a result, the paper exit roller rotates in the reverse direction. (see figure-2) The paper is fed to the
automatic duplex rollers in the optional Automatic Duplex Unit through the paper guides along the paper path. Further, the paper is
fed to the registration roller by the automatic duplex rollers and advanced to the fuser unit. After fusing, the paper arrives the paper
exit roller and is fed to the output tray by the paper exit roller.
switching lever engages with the switching gear-A, and the rotation of rotation switching gear-A is locked. As a result, the rotation
from the BK motor is transmitted to the paper exit roller in order of numbers (1 - 7) through the double teeth gear. The arrows indi-
cate the rotation direction of each gears.
This advances the sheet of paper between the paper exit roller and switchback pinch roller. The paper is fed to the output tray by
the paper exit roller and pinch roller. At the proper time, the switchback solenoid is turned on. The rotation switching gear-B is
locked by the switching lever, and the rotation from the BK motor is transmitted to the paper exit roller in order of numbers (1 - 7)
through the double teeth gear. As a result, the paper exit roller rotates in the reverse direction. (see figure-2) The paper is fed to the
automatic duplex rollers in the optional Automatic Duplex Unit through the paper guides along the paper path. Further, the paper is
fed to the registration roller by the automatic duplex rollers and advanced to the fuser unit. After fusing, the paper arrives the paper
exit roller and is fed to the output tray by the paper exit roller.
