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)...

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...

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...

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...

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,...

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...

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...

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....