Panasonic UF-580 / UF-590 / UF-780 / UF-790 / UF-5100 / UF-6000 / UF-6100 / DX-600 / DX-800 Service Manual / Other ▷ View online
21
SEP 2005
Ver 3.0
UF-580/590/780/790
UF-5100/6000/6100
DX-600/800
1.1.9
SNS PC Board
Each sensor consist of an LED and photo transistor. When documents are placed on the ADF tray or are
moving, a shutter in the document sensor opens. The light from the LED turns the photo transistor “ON”,
and the output voltage from the sensor becomes a “Low” level. With no document on the ADF tray, the
shutter interrupts the light path, and the output from the sensor is kept at a “High” level. Operation of the RP
Sensor is exactly the same as the ADF Sensor. The ADF Cover Sensor operation is similar, except that the
output from the sensor is kept at a “Low” level when the cover is closed and becomes a “High” level when
the Printer Cover is opened.
moving, a shutter in the document sensor opens. The light from the LED turns the photo transistor “ON”,
and the output voltage from the sensor becomes a “Low” level. With no document on the ADF tray, the
shutter interrupts the light path, and the output from the sensor is kept at a “High” level. Operation of the RP
Sensor is exactly the same as the ADF Sensor. The ADF Cover Sensor operation is similar, except that the
output from the sensor is kept at a “Low” level when the cover is closed and becomes a “High” level when
the Printer Cover is opened.
Read Point
Sensor
Sensor
GND
+5V
+5V
nBPNT
PC3
Shutter
A
K
ADF Cover Sensor
(ILS PC Board)
MPU
CPU
(IC1)
Shutter
PC2
A
K
ADF
Sensor
Sensor
GND
PC1
Shutter
A
K
SC PC Board
PNL1 PC Board
+5VP
+5VP
PNL CPU
IC1
22
SEP 2005
Ver 3.0
UF-580/590/780/790
UF-5100/6000/6100
DX-600/800
1.1.10 Control Panel
The Control Panel consist of the Display PCB and Panel Unit, which display various status information. It is
normally interfaced to the main CPU. Keyed input signals are received by the Panel CPU and the data is
transferred to the main CPU on the SC PC Board.
The Control Panel performs the following processes simultaneously:
normally interfaced to the main CPU. Keyed input signals are received by the Panel CPU and the data is
transferred to the main CPU on the SC PC Board.
The Control Panel performs the following processes simultaneously:
• Key inputting
• LED, LCD display
• Data transmission / reception
• LED, LCD display
• Data transmission / reception
Interface to main CPU
The interfacing between the main CPU and the panel CPU are all executed with commands and responses
in the following two formats:
The interfacing between the main CPU and the panel CPU are all executed with commands and responses
in the following two formats:
• Command / response (1 byte) + number of data + check sum
• Command / response (1 byte) + number of data + data 1 + data 2........................ + data n + check sum.
• Command / response (1 byte) + number of data + data 1 + data 2........................ + data n + check sum.
PNLCK
PNLRD
PNLSD
PNLRST
BZCLK
+5V
+5VP
GND
GND
nPWSAVE
nWAKEUP
nBPNT
BATLVL
20 characters, 2 lines, 5x7 dots control
LED, KEY scanning
LED, KEY scanning
2
8
8
8
SCN (7:0)
KIN (7:0)
LED
Key matrix
(59 keys)
(59 keys)
PNL1 PC Board
11
LED (1:0)
LEDCT (1:0)
From/to
SC
PCB
23
SEP 2005
Ver 3.0
UF-580/590/780/790
UF-5100/6000/6100
DX-600/800
1.1.11 Printer Motor Drive Circuit
Motor Drive Circuit
The Printer Motor is a 4-phase uni-polar PM-type step motor. The step signals (pMMP0A to pMMP3A)
are transmitted to IC38 (the Chopper Drive Circuit) from IC3 SHINE output ports. The chopper current is
determined by the voltage at IC38, Pin3 and Pin13. The Printer Motor has two speeds, Slow and
Constant. The Printer Motor is powered by a +24 VDC supply. When the interlocks are open, the +24
VDC supply is cut off and the Printer Motor stops rotating.
are transmitted to IC38 (the Chopper Drive Circuit) from IC3 SHINE output ports. The chopper current is
determined by the voltage at IC38, Pin3 and Pin13. The Printer Motor has two speeds, Slow and
Constant. The Printer Motor is powered by a +24 VDC supply. When the interlocks are open, the +24
VDC supply is cut off and the Printer Motor stops rotating.
Pulse
Motor
Motor
Laser Printer Motor Drive Circuit Block Diagram
SHINE
IC3
+24 VM
3
1
6
4
pMMP0a
nMMP0a
pMMP2a
CN54
nMMP2a
Motor
Driver
IC38
24
SEP 2005
Ver 3.0
UF-580/590/780/790
UF-5100/6000/6100
DX-600/800
Fuser Lamp Drive Circuit
The Fuser Lamp is powered by 100 VAC (200 VAC). It is driven by the LVPS and controlled by the nSSR
signal from the SC PC Board. When the CN103, Pin11 (nSSR) on the LVPS goes LOW, the Fuser Lamp
turns ON. This lights up the PC102 LED and activates the TRC100 photo-triac, and VAC 115 VAC is sent
to the Fuser Lamp. The time at which TRC100 is actually activated depends on the 100 VAC (200 VAC)
sine wave. When the cross-voltage for Pin 6 and Pin 4 of PC102 is other than 0 Volts (sine wave
exceeds 0 volts), PC102 inhibits the activation of the triac and turns ON the Fuser Lamp.
signal from the SC PC Board. When the CN103, Pin11 (nSSR) on the LVPS goes LOW, the Fuser Lamp
turns ON. This lights up the PC102 LED and activates the TRC100 photo-triac, and VAC 115 VAC is sent
to the Fuser Lamp. The time at which TRC100 is actually activated depends on the 100 VAC (200 VAC)
sine wave. When the cross-voltage for Pin 6 and Pin 4 of PC102 is other than 0 Volts (sine wave
exceeds 0 volts), PC102 inhibits the activation of the triac and turns ON the Fuser Lamp.
99
CN103
+24V
R127
4
2
1
PC102
nSSR
TRC100
2
1
2
1
C109
C108
R112
R111
R111
2
1
CN102
H
CN102
Fuser Lamp
Fuse
Thermostat
Thermal Fuse
3
SC PCB
6
LVPS
Fuser Lamp Drive Circuit Diagram
L301
L101
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