Panasonic KX FLB758RU User Manual

							7.9.9. PAPER SENSOR..... “OUT OF PAPER”
The Sensor detects the recording paper are in place.
W hen the recording paper is detected, the shelter plate let the sensor light passing through, the photo-transistor turns ON, and the
input signal of IC610-121 pin becomes a low level.
W hen there is no recording paper, the shelter plate closes the sensor light, the photo-transistor turns OFF, and the input signal of
IC610-121 pin becomes a high level.
[Paper Sensor]
Photo-transistorSignal (IC606-178 pin)
Recording Paper SetOFFHigh level
No Recording PaperONLow level
7.9.10. PAPER EXIT SENSOR..... “PAPER JAMMED”
The sensor detects whether the recording paper exit out or noy.
W hen there is no recording paper at the position of the sensor, the shelter plate closes the sensor light, the photo-transistor fot
tarus OFF, and the input signal of IC610-120pin becomes high level.
W hen the recording paper reach the exit sensor, the shelter plate let the sensor light passing through, the photo-transistor ON, and
the input signal of IC610-120pin becomes a low level.
[Exit Sensor]
Photo-transistorSignal (IC606-179 pin)
No PaperOFFHigh level
Paper ExistONLow level
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							7.9.11. TONER SENSOR.... “TONER EMPTY”, “TONER LOW”, “CHANGE DRUM”
The Sensor detects whether or not the Developer unit and the toner are present.
W hen there is not Development unit, the shelter plate let the sensor light passing through, the photo-transistor turns ON, and
the input signal of IC610-128 pin (Digital P.C.B) becomes a low level over 9s. W hen the Developer unit is set, the shelter plate
move with rotation of develop ment roller, so the photo-transistor turns ON/OFF. If the time of IC610-128 pin´s high level is under
600ms, there is enough toner in Developer unit, if not, toner is near empty.
Toner Sensor
The rest of toner is detected by the move speed of the magnet put on the pendulum of Mixing Paddle . The pendulum is pushed
up by the Mixing Paddle , then it falls down by its own weight. The rotation speed of paddle is set slower than the one of
pendul um which falls down by its own weight. W hen the toner is still left, the pendul um falls and stops on the toner, then pushed
by the paddle , it starts to rotate. W hen no toner is left, the pendul um falls to the bottom. Consequently the contact time between
the magnet and steel becomes short when toner is left and long with no toner.
StatePhoto-transistorSignal (IC610-128pin)
Toner Set (full)OFF time = about 0.3sHigh level = about 0.3s
Near Empty TonerOFF time>0.6sHigh level>0.6s
No DEV Unit
(“CHANGE DRUM “)ONLow level fix
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							7.9.11.1. TONER DETECTION FLOW
CAUTION: 1. Toner low can be judged by continuous 5-times TONER LOW signal at only printing.(It is not execute d at.)
 2. Toner full can be judged by continuous 3-times TONER FULL signal at initializa tion.
(It is not execute d at printing.)
 3. In the ordinal operation, “CHECK DRUM ”is displayed when TONER EMPTY sensor does not generate a signal for 2.7
seconds.
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							7.10. OPERATION BOARD SECTION
The unit consists of a LCD (Liquid crystal display), KEYs and LEDs (light-emitting diodes). They are controlled by the Gate Array
(IC101) and ASIC (IC610: on the DIGITAL BOARD).
The key matrix table is shown below.
CN101
CN611
IC610 G/A
LCD MODULE
CN102
8x5
KEYS
MATRIX
LED
DIGITAL BOARD
OPERATION BOARD
GATE ARRAY IC
 1. Key Matrix (Hard only)
KIN0KIN1KIN2KIN3KIN4KIN5KIN6KIN7
KS03
(SW 109)#
(SW 112)6
(SW 110)8
(SW 107)5
(SW 106)2
(SW 105)9
(SW 111)0
(SW 108)
KS1REDIAL
(SW 113)MONITOR (SW 116)HANDSET MUTE
(SW 114)7
(SW 103)4
(SW 102)1
(SW 101)FLASH
(SW 115)(SW 104)
KS2RESOLUTION (SW 133)FAX START(SW 137)SCAN
(SW 134)COPY
(SW 135)COLLATE (SW 132)----------STOP
(SW 136)AUTO
ANSW ER (SW 117)
KS3F3
(SW 123)F5
(SW 122)F4
(SW 120)F2
(SW 121)F1
(SW 119)----------F6
(SW 124)LOW ER
(SW 118)
KS4VOL+
(SW 126)VOL-
(SW 129)NEXT
(SW 128)MENU
(SW 131)HELP
(SW 130)PRINT
REPORT (SW 125)PREV
(SW 127)----------
 2.  LED
 
     · 
  
  AUTO ANSW ER LED ON/OFF port---XLD8 (IC101-5)
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							7.11. LCD SECTION
The Gate Array (IC101) works only for writing the ASCII code from the data bus (D4~D7). V0 is supplie d for the crystal drive.
R130 and R134 are density control resistors.
Consequently, in this unit, the timing (positive clock) is generated by the LCD interface circuitry in the gate array (IC101).
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							7.12. HVPS (High Voltage Power Supply) SECTION
7.12.1. HVPS SPECIFICATION
NoOutput voltageItemSpecificationNotes
1ElectrostaticRate output voltage-1200±35V
ChargeImpedance range80M~1200MΩ
CHG BIASOutput formatConstant voltage
2DevelopingRate output voltage-350±15V
DEV(-) BIASImpedance range20M~2000MΩ
Output formatConstant voltage
DevelopingRate output voltage+220+20-50V
DEV(+) BIASOutput formatConstant voltage
3Supply rollerRate output voltage-550±50V
SUP BIASImpedance range20M~2000MΩ
Output formatConstant voltage
4TransferVariable output current+4~30µAOutput current
TRA(+) BIASOutput voltage+3500V Max.varies with the
Output formatVariable Constant currentprinted rate.
TransferRate output voltage-1200±100V
TRA(-) BIASOutput formatConstant voltage
DEV BIAS is output from one of the output terminals after the DEV CHG signal selects DEV(+) BIAS and DEV(-) BIAS.
TRA BIAS is output from one of the output terminals after the TRA CLK signal selects TRA(+) BIAS and TRA(-) BIAS.
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							7.12.2. CHG-BIAS (Charge BIAS)/SUP BIAS (Supply BIAS)/DEV(-) BIAS (Developing(-)BIAS)/DEV(+) BIAS (Developing(+) BIAS) UNIT
W hen the CHG REM terminal becomes “L ”, the transistor Q202 turns ON by MC101 , Charge BIAS(-1200V) is output from CHG
OUTPU T, Supply BIAS(-550V) is output from SUP output, and Developing(-) BIAS(-350V) is output from DEV(-) BIAS.By
performing the DEV(-) BIAS output, the conden ser C208 is charged with an electric charge. Charging the C208 will be saturated
at 50ms. After that, when DEV CHG terminal becomes “L ”, Q204 turns ON, and the electric charge charged to the C208 is
released. This electric charge becomes a constant voltage at ZD203, and Developing(+) BIAS(+220V) is output from DEV(+) BIAS.
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							7.12.3. TRA(+) BIAS (Transfer(+) BIAS)/TRA(-) BIAS (Transfer(-) BIAS) UNIT
W hen the CHG REM terminal is“L ” and the TRA CLK terminal is “Open” , Transfe r(-) BIAS(-1200V) is output from TRA OUTPUT
the moment Charge BIAS(-1200V) is output from CHG OUTPU T. W hen 8KHz PW M (pulse-width modulation) signal is input to the
TRA CLK terminal, Q101 turns ON by MC101 , and TRA(+) CURRE NT BIAS according to the PW M signal is output from TRA
OUTPU T. The PW M signal will be turned to a constant voltage by the resistor and the conden ser, and input to the MC101 . The
MC101 compares this voltage with the feedba ck voltage from T101 and controls the Q101. As for the transfer current, +30µA is
output when DUTY of the TRA CLK input signal is 0%, or +4µA is output when that is 70%.
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							7.13. HEAT LAMP CONTROL CIRCUIT
The temperature of the fixing part of the Fixing Unit is converted to a voltage by THERMISTER and input to IC604-Y6 (analog
input). The heater turns ON/OFF the photo-coupler PC101 at the heater control port (IC610-80pin), and is turned ON/OFF at
the triac CR101. And a thermostat and a thermo fuse are set on the AC line as the safety devices.
 1. Control at Printing
 a. After the printing signal is received, turn ON the heater.
 b. After that, turn ON the motor at the temperature T1 (about 125 °C).
 c. After that, control at the temperature T2 (about 180 °C), and after the fixing stable time tf has passed, feed papers at the
paper feeding permission time t3.
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							T0: Initial Temperature (At Power OFF / Normal Temperature)
T1: Primary Stable Temperature (Heater Disconnection / Thermistor Loose Connec tion Detection Temperature)
T2: Second ary Stable Temperature (Paper Feedin g Permission Temperature / Fixing Control Temperature)
Th: Abnormal High Temperature
t0: Initial Time (After Printing Signal Received)
t1: Primary Stable Time
t2: Second ary Stable Time
t3: Paper Feedin g Permission Time
tl: Abnormal Low Temperature Detection Time
tf: Fixing Stable Time
 2.  Safety Control by Hardware
Considering the heater remains ON due to such as a program runaway or a thermistor breakdown, the followin g safety devices
are prepared.
 a. If the temperature detected by the thermistor exceed s 220° C, IC610-7pin becomes Low, and the heater is turned OFF
forcibly.
 b. If the temperature of the thermostat exceed s 135 °C(*), the internal switch turns off to cut off the current to the heater, and
the heater is turned off.
 c. If the temperature of the thermo fuse exceed s 118 °C(*), the internal switch turns off to cut off the current to the heater, and
the heater is turned off.
* Thermo stat and thermo fuse is apart from heat roller, so the detect temperature is low.
 3.  Safety Control by Software
 a. Abnormal Low Temperature Detection (Heater Disconnection Detection / Thermistor Loose Connec tion Detection)
After the heater is ON, if the temperature of the fixing part does not reach T1 until tl, the heater will be OFF due to the
abnormal low temperature detection (heater disconn ection / thermistor loose connection).
 b. Abnormal High Temperature Detection If the thermistor detects the temperature Th, the heater will be OFF due to the abnormal high temperature detection.
Temperature [ °C]Register Value [K Ω]Voltage [V]
12520.62.2
1807.01.5
2253.41.0
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