Panasonic UF-6300 / UF-6200 / UF-5300 (serv.man3) Service Manual / Other ▷ View online
17
UF-6300/6200/5300
Dial Pulse Generator
The Dial Pulse Generator consists of a CML relay, a DC hold circuit, a dial pulse generate circuit and
their peripheral circuits. The generator generates dial pulses. The CPU on the SC PC Board controls all
dial pulse generation sequences. When the absence of the terminating message is confirmed by the Off-
Hook detector, the CPU turns the CML relay ON and the dial pulse generate circuit ON through DAA to
develop loop status (DC loop). After a few seconds, the CPU turns the PLS relay ON and OFF to
generate dial pulses, making and breaking the loop. The line status during dialing is shown below.
their peripheral circuits. The generator generates dial pulses. The CPU on the SC PC Board controls all
dial pulse generation sequences. When the absence of the terminating message is confirmed by the Off-
Hook detector, the CPU turns the CML relay ON and the dial pulse generate circuit ON through DAA to
develop loop status (DC loop). After a few seconds, the CPU turns the PLS relay ON and OFF to
generate dial pulses, making and breaking the loop. The line status during dialing is shown below.
DTMF Tone Generator
The DTMF Tone Generator is incorporated in the MODEM on the SC PC Board. The DTMF tone is
conveyed to the telephone line using the same route as the facsimile signal. The DTMF tone selection is
controlled by the CPU. Digital amplitude signal is conveyed as analog amplitude signal through D/A
converter in the DAA (IC23). The line status during dialing is shown below.
conveyed to the telephone line using the same route as the facsimile signal. The DTMF tone selection is
controlled by the CPU. Digital amplitude signal is conveyed as analog amplitude signal through D/A
converter in the DAA (IC23). The line status during dialing is shown below.
Ring Detector
When the unit is in the Sleep Mode status, a Ringing signal is detected by a photo-coupler (PC301) in
Ring Detector to cancel the power-save for waking up. Then DAA (IC23) detects the ringing signal for
receive mode.
When the unit is normal operating status, DAA (IC23) detects the ringing signal immediately.
Ring Detector to cancel the power-save for waking up. Then DAA (IC23) detects the ringing signal for
receive mode.
When the unit is normal operating status, DAA (IC23) detects the ringing signal immediately.
CML Relay
Dial Pulse
Generate Circuit
Generate Circuit
Line status
break
make
make
break
Line release
Speech
condition
First
digit
make
break
Pre-pause
Inter-digit
pause
Speech
condition
Speech
condition
Second
digit
CML Relay
Line status
break
make
Line release
Speech
condition
First
digit
make
break
DTMF signal
Signal time
Inter-digit
pause
Speech
condition
Second
digit
Speech
condition
18
UF-6300/6200/5300
1.1.8
SNS PC Board
Each sensor consists 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 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 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
(S-Door)
ADF Cover Sensor
ADF Cover Sensor
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
19
UF-6300/6200/5300
1.1.9
Control Panel
The Control Panel consists 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.
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
• Back Light Control
• LED, LCD display
• Data transmission / reception
• Back Light Control
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.
1.1.10 Printer Motor Drive Circuit
Motor Drive Circuit
The Printer Motor is a 4-phase uni-polar PM-type step motor. The step signals (MMpA to MMnB) are
transmitted to IC38 (the Chopper Drive Circuit) from IC3 SHINE output ports. The chopper current is
determined by the voltage at IC38, 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.
transmitted to IC38 (the Chopper Drive Circuit) from IC3 SHINE output ports. The chopper current is
determined by the voltage at IC38, 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.
PNLRD
PNLSD
PNLRST
BZCLK
+5V
+5VP
GND
GND
nPWSAVE
nWAKEUP
nBPNT
+24V
GND
20 characters, 2 lines, 5x8 dots control
LED, KEY scanning
LED, KEY scanning
2
8
8
8
SCN (9:0)
KIN (7:0)
LED
Key matrix
(70 keys)
(70 keys)
PNL1 PC Board
13
LED (2:0)
LEDCT (1:0)
From/to
SC
PCB
Panel CPU
LED PC Board
Back Light
20
UF-6300/6200/5300
Laser Printer Motor Drive Circuit Block Diagram
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.
Fuser Lamp Drive Circuit Diagram
Fuser Temperature Control Circuit
The fuser temperature is controlled by IC1 on the SC PC Board, which contains A/D (Analog/Digital)
converters ANI0 to ANI7. The Fuser Temperature Control Circuit uses A/D converter, ANI1. When the
PC001 drive current is transmitted from the SC PC Board to the PSU (LVPS), the Fuser Lamp turns ON.
IC32 is a comparator with open output at pins 1 and 7 and is used as an abnormal temperature detection
circuit. IC32, pin 7, has a high impedance when Q44 is activated, turning ON the Fuser Lamp.
An abnormal temperature is detected when the VTH voltage level becomes higher than V+, forcing IC32,
pin 7 Low and deactivating Q44.
Abnormally low and high temperatures, as well as Thermistor release status, are detected by IC1 (CPU)
programming.
converters ANI0 to ANI7. The Fuser Temperature Control Circuit uses A/D converter, ANI1. When the
PC001 drive current is transmitted from the SC PC Board to the PSU (LVPS), the Fuser Lamp turns ON.
IC32 is a comparator with open output at pins 1 and 7 and is used as an abnormal temperature detection
circuit. IC32, pin 7, has a high impedance when Q44 is activated, turning ON the Fuser Lamp.
An abnormal temperature is detected when the VTH voltage level becomes higher than V+, forcing IC32,
pin 7 Low and deactivating Q44.
Abnormally low and high temperatures, as well as Thermistor release status, are detected by IC1 (CPU)
programming.
Pulse
Motor
Motor
SHINE
IC3
+24 VM
3
1
6
4
MMnA
MMpA
MMnB
CN54
MMpB
Motor
Driver
IC38
11
11
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
L301
L101
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