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KX-MB1520FX7/KX-MB1520FX8/KX-MB1520FXW/KX-MB1530FX7/KX-MB1530FXW
6.17. Heat Lamp Control Circuit
The temperature of the fixing part of the Fuser Unit is converted to a Voltage by THERMISTOR and input to IC300_pinD19.
The heat lamp is turned on/off by the HTRCTL signal (IC300_pinAD19) through the photo triac (PC2) and the triac (SCR51).
Two thermostats are provided on the AC line as the safety protection devices.
Overheat protection circuit is provided so as to prevent the Fuser unit from overheating when CPU cannot control Fuser by any
problem.
IC504 compares Thermistor voltage and predetermined voltage, which is determined by 3.3V, R581 and R584.
If Thermistor voltage becomes lower than this predetermined voltage (this voltage corresponds to about 240°C), output of
IC504_pin7 becomes "H", then
(In case of MB1500/MB1520)
Q530 and Q529 turn ON.
Once Q529 turns on, Q530 keeps "ON condition" even after IC504_pin7 becomes "L".
And this "ON condition" of Q530 makes both Q500 and Q527 turn off.
(In case of MB1530)
Q530 turns ON.
Once Q530 turns on, IC507_pin7 keeps "H" even after the voltage of THERM1 becomes bigger than the voltage of
IC504_pin5.
And when IC507_pin7 keeps "H", both Q500 and Q527 turn off.
As the result, once Fuser temperature exceeds 240°C (this temperature is abnormal condition), no current is supplied to Fuser lamp.
1.
Heater control sequence at printing mode
a. After receiving printing data, heater turns on.
b. When heater temperature reaches to the Primary Stable Temperature (160
C).
c. When heater temperature reaches to the Secondary Stable Temperature (160
C/185
C), paper feed starts.
Summary of Contents for KX-MB1520FX7
Page 52: ...52 KX MB1520FX7 KX MB1520FX8 KX MB1520FXW KX MB1530FX7 KX MB1530FXW 6 10 3 5 Waveform ...
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Page 175: ...175 KX MB1520FX7 KX MB1520FX8 KX MB1520FXW KX MB1530FX7 KX MB1530FXW Toner detection flow ...
Page 188: ...188 KX MB1520FX7 KX MB1520FX8 KX MB1520FXW KX MB1530FX7 KX MB1530FXW 2 CHG 3 TRA ...
Page 189: ...189 KX MB1520FX7 KX MB1520FX8 KX MB1520FXW KX MB1530FX7 KX MB1530FXW 4 DEV DC ...
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Page 218: ...218 KX MB1520FX7 KX MB1520FX8 KX MB1520FXW KX MB1530FX7 KX MB1530FXW 14 10 How to Remove LVPS ...
Page 236: ...236 KX MB1520FX7 KX MB1520FX8 KX MB1520FXW KX MB1530FX7 KX MB1530FXW 14 24 7 Fuser section ...
Page 255: ...255 KX MB1520FX7 KX MB1520FX8 KX MB1520FXW KX MB1530FX7 KX MB1530FXW 15 6 1 NG Example ...
Page 258: ...258 KX MB1520FX7 KX MB1520FX8 KX MB1520FXW KX MB1530FX7 KX MB1530FXW Memo ...
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