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Sharp AR-5012 Service Manual
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AR-5012 ELECTRICAL SECTION 13 - 8(3) Reset circuitThis circuit detects ON/OFF of power to control start/stop of each cir-cuit. The 3.3V voltage of the main PWB is detected by the reset IC togenerate the reset signal.When the power voltage reaches the specified level, the circuit opera-tions are started. Before the power voltage falls below the specifiedlevel, the circuit operations are stopped to prevent against malfunc-tions.(4) Heater lamp control circuita. OutlineThe heater lamp control circuit detects the heat roller surface tempera-ture and converts in into a voltage level. The converted voltage isinputted to the CPU analog input pin.The CPU converts the inputted analog voltage into a digital signal leveland compares it with the set value of the simulation to control on/off theheater lamp according to the level, maintaining the heat roller surfacetemperature at a constant level.The lower the heat roller surface temperature is, the greater the ther-mistor resistance is, and vise versa.Therefore, the lower the heat roller surface temperature is, the higherthe thermistor terminal voltage is, and vise versa. The thermistor termi-nal voltage is inputted to the CPU analog port.The CPU controls ON/OFF of the heater lamp by this input voltagelevel.[High temperature protect circuit in case of CPU hung up]For IC120 3pin (reference voltage), +3.3V is divided by the resistor.The thermistor terminal voltage is inputted to IC120 2pin.When, the voltage at 2pin becomes lower than the voltage at 3pin(when the heat roller temperature is about 220 – 230°C), IC120 1pinbecomes HIGH, and the HL signal is lowered to the GND potentialthrough IC124, stopping generation of the heater lamp ON signal.(IC120 1pin is normal LOW.)235 cpudata10 IN/OUT CPU CPU data bus236 VCC(AC) 3.3V Power237 cpudata9 IN/OUT CPU CPU data bus238 cpudata8 IN/OUT CPU CPU data bus239 GND(CORE/DC) Power240 cpudata7 IN/OUT CPU CPU data bus241 cpudata6 IN/OUT CPU CPU data bus242 cpudata5 IN/OUT CPU CPU data bus243 cpudata4 IN/OUT CPU CPU data bus244 VCC(CORE/DC)3.3VPower245 cpudata3 IN/OUT CPU CPU data bus246 cpudata2 IN/OUT CPU CPU data bus247 cpudata1 IN/OUT CPU CPU data bus248 cpudata0 IN/OUT CPU CPU data bus249 VCC(AC) 3.3V Power250 xcpucs IN CPU CS signal251 mem_intr (Not used)252 GND(AC) Power253 arb_intr OUT CPU INTR signal254 cpusync OUT CPU CPU SYNC signal255 cpu_ad9 IN CPU CPU address bus256 cpu_ad8 IN CPU CPU address busPINNo. Signal Name IN/OUT Connectedto DescriptionReset _OUT (ASIC Reset)VCC3 VCC3R11411kFC1240.1uC12522000pR11710kFIC104M51957BFPNC 8GND4VCC 7NC1IN2NC3Cd 5OUT 6R11510kJCPUP34/RESASIC12VVCC3VCC3 VCC312VVCC312V12V12VVCC35VFTHRTHTHOPENRTH_IN (1-A3)(4-A3)(5-B2)(9-C2)or KIA393For KIA393For KIA358For KDS226 or KDS226R1567.5kFR1594.3kFD101MA700R1551MFR1541kFR15810kFR1571kJC19722000p C1990.1uR169300J R170100JC1980.1uD102DA204K123D103DA204K123R1711.2kFR17310kFR17210kJC20022000p+-IC120ANJM290332 184C1960.1u+-IC120BNJM290356 784+-IC122ALM35832 184CPUAN0t12ThermistorHeat RollerSW5V(3-3B) HLHT EMP HLOUT (10-3A)/HLIC205TD62503FI11 O1 16I22 O2 15I33I44 O3 14I55 O4 13I66 O5 12I77COM8O6 11O7 10NC 9R274240JR280240JQ205DTA143XKAOUTINGNDD1031SS133AKTo AC circuit(Heater lampControl) |
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