AE Auto Exposure sensor circuit, Reset IC IC13 | Sharp SF-1020

(9) AE (Auto Exposure) sensor circuit

The AE sensor circuit is composed of the AE sensor PWB; which is composed of the photo diode, the I-V convertor circuit, and the amplifier circuit; and the amplifier circuit on the control PWB.

					+24V
CPU					4
CPU		AES		R40	1
	AN0			R40

				1KJ	IC14A
				1KJ	IC14A
			C38	ZD2	LM324 11
			1000PF	HZS883
			1000PF
I/O		AEG1
I/O
		AEG0

		R50	100KJ
2	R53	C48	0.1µ F
3	1KJ		6
		7	6
		7	5
		IC14B	5
		IC14B
		LM324
R44	R43	R45	R47

15KF 750F 75F 270F

AEG1

AEG0

	PDK
	PDA
R48		C49
100KJ		2200PF

AE sensor PWB

Operation amplifier A performs I-V conversion of the original density level (minute current) from the sensor. Operation amplifiers B and C amplify the output of operation amplifier A to a suitable level for inputting to the CPU.

The amplifying level is automatically set by selecting the AE gain signal (AEG0 ∼ AEG2) outputted from the I/O chip when test command SIM 47 is executed.

AE operation is performed by the software in the control PWB. When a reflected ray enters the sensor, a voltage corresponding to the light quantity is inputted to the CPU. The CPU compares the input voltage and the copy lamp application voltage and controls the copy lamp voltage so that the exposure level corresponds to the original density.

(10) Toner supply motor drive circuit

IC104 is the motor control IC which drives the toner supply motor with the pulse signals (TMa, TMb) outputted from the I/O chip.

						+24V
				IC5		C2
		+5V	2		6	+
		+5V
	TMa		9	IN1	8	10UF35V
				IN1
I/O	TMb		1	IN2	7	TMa
I/O			5	IN2	3	TMb
			5	GND	3	TMb
				GND
	R20	R211		TA7291S
	47KJ	47KJ

M

Truth value table

	Input			Output		Mode
						Mode
TMa		TMb	TMa		TMb

L		L	∞		∞	Stop

H		L	H		L	CW/CCW

L		H	L		H	CCW/CW

H		H	L		L	Break

∞: High impedance Internal circuit

(11) Reset IC (IC13)

1General

The M51953 BL is the semiconductor IC most suitable to detect the power voltage and reset the logic circuit of every type including the CPU.

It is provided with the built-in delay circuit. Delay time is easily ob- tained by adding external capacity.

Pin connections (Top view)

	5	Output
BL	4	Delay capacity
M51953	3	GND
	3	GND
	2	NC
	1	Power

+5V		+24V
2	8
		6	+24V
	REG	TMa
	REG	7
		7
			M
	Protection	3
	circuit	TMb
	(Heat insulated)	TMb
	(Heat insulated)
9	1	5
		GND
TMa		4 pin = NC pin
TMb

External view 5P5

12 – 14

Image 133

Sharp SF-1020, SF-1120 AE Auto Exposure sensor circuit, Toner supply motor drive circuit, Reset IC IC13, Cw/Ccw, Ccw/Cw

Contents

SF-1020 SF-1120 Contents Lower heat roller replacement Electrical Section System configuration options Product featuresProduct Outline Basic specifications Product SpecificationsADU SF-CM15 Description of each sectionSF-CM16 Brazil/Asia except Hong Kong Supply partsMiddle East/Africa SF-LS12 Optional specifications Staple section Bin staple sorter 10-bin SS Model name SF-S54Two-step paper feed unit Model name SF-CM15 One-step paper feed unit SF-CM16 External view and internal structure Product Views SF-1020 Operation panel SF-1120 Motors Clutches and solenoids PWB Explained with the SF-1120 and the SF-CM15 Ilsw TCSMSW POD Rollers, mirrors, etc Installation Unpacking and InstallationInstalling conditions Unpacking Power source Installation baseGrounding wire connection Space around the machine Main charger unit electrode cleaning Charger cleaningOptical system lock release No /3 mirror unit lock release Developing unit setting Developing unit setting Toner density sensor level adjustment Accessory installationCopy tray installation Developing unit level adjustmentPage Label attachment Center shift adjustmentLabel attachment Parts packed together Optional two-step paper feed unit SF-CM15 installation Optional one-step paper feed unit SF-CM16 ING and InstallationIncluded parts Removing the rear cover to the main copier units lower tray Removing the lower tray from the main copier unit Placing the main copier unit over the paper feed unitAttaching the main copier unit and paper feed unit Plugging in the relay harness Tray paper size selection Described with the SF-1020 Set the modeCentering the paper Remove the tray Set paper, and change the paper size display Attach the tray Paper feed section Descriptions of Each SectionGeneral descriptions Basic operations Basic composition Developing section Basic operations Optical sectionGeneral description Mirror Original table Copy lampLens fixed focus lens Lens home position sensor Lhps Temperature fuse Lens drive wireExposure adjustment plate Mirror base drive wire CLV Original size sensingEX1 EX5 CPU Optical system dirt correction This model basic process and structure Copy processPhotoconductor Process diagram Main Charging Details of image forming processExposure CTL CGL CGL CTL Development Separation TransferCTL Discharging Cleaning Photoconductor drum sensitivity correction Transition of photoconductor surface potentialProcess control function Summary Process control timing Process controlDrum marking Basic structure General Fusing paper exit sectionBasic composition and functions ADU unit SF-1120 only High voltage sectionBasic composition Basic operation Details of operation Paper feed unit Disassembly and AssemblyPaper feed roller assy removal Separation roller PS front roller assyPaper feed roller, take-up roller Transport unit Transport belt Fusing unit removal Fusing sectionHeater lamp replacement Upper heat roller assy removal Lower heat roller replacement Upper separation pawl replacementLower separation pawl replacement Mirror base wire replacement and adjustment Copy lamp replacementOptical system Thermistor/thermostat removal No /3 mirror unit mirror base B removal Mirror base wire removal Mirror base wire stretching No /3 mirror unit mirror base B assemblyMirror base wire fixing Page No /5 mirror unit mirror base C replacement Copy lamp unit installation Mirror base a positioningNo /5 mirror removal No /5 mirror unit assembly Lens wire removal Lens wire replacement Procedures Lens unit installation Lens unit replacementLens removal High voltage section Cleaning/replacement and noteMain charger MC unit Process section ~0.5 Cleaning/replacement and precautionsTransfer/separation charger TC/SC unit Process unitPage Discharge lamp unit Clean every 50K copies Blank lamp unit Clean every 50K copiesDrum Replace every 50K copies DV side seals F/R replacement Replace every 120K copies Cleaner blade Replace every 50K copiesDrum separation pawl Replace every 50K copies Toner reception seal Replace every 50K copies Ring attachment DB blade replacement Replace every 120K copies Operation panel/intermediate cabinet Cooling fan motor replacementFrame major parts Developing unit color identification Tray size detecting PWB Power unitCooling fan motor Main PWB unit AC power PWB Take-up roller/paper feed roller Multi paper feed unit SF-MF15 option Reverse roller ADUPaper feed roller Paper feed unit SF-CM15, SF-CM16, option Developing doctor clearance adjustment AdjustmentsDeveloping magnet roller main pole position adjustment Adjustment procedure Adjustment items YES Lens reference position adjustment Adjustment of each sectionNo /5 mirror reference position adjustment 51 50 110 Vertical copy magnification ratio adjustment Resolution adjustment Focus adjustment No.4/5 mirror adjustment screw Adjustment procedure Horizontal copy magnification ratio adjustment Comparison table of lens values and simulation input values Horizontal skew adjustment Vertical skew adjustment Mirror base rail handle Loosen Exposure balance adjustment Center shift adjustment Copy lead edge adjustment End of scale image Original detecting section Original detecting arm unit adjustment 3 4 5 6 Original detecting level adjustmentA4R LTR Simulations operating procedure Operating procedureSimulation Purpose List of simulations Cassette size switch table Simulation 26-6 Destination setting Details of simulations Full power on Psps WLT LTR INV A4R B5R ADF counter display ← Initial value OFF SEC Secl Seeg SUK SCA PPD2 PPD1PPD3 PPD4 PD1 PD0PD2 PD3 Developer counter clear Display range 8 ∼ No trouble 31 ∼ 35 --- Trouble The sub code is displayed Copying without grid bias correction AE + PE ME + PE Paper transport direction magnification ratio adjustment ADU alignment plate home position adjustment SF-2120 only 30 sec. This function can be cleared User simulation User simulation code table User simulationLED Summary/purpose Self DiagnosticsOperation Clearing the self diag display SF-1120 only LOW High Remedies General Make a copy and adjust Set value recording sheet Memory simulation list Maintenance cycle and maintenance items Maintenance Electrical Section System block diagram JAM System operation when the power is turned onRPL on PSW on RPL OFF Main circuit Block diagram CPU IC6 SC3041K12F FeaturesPin arrangement DMA Internal block diagramDmac ROM RAM CPU SC3041K12F IC1 pin signal MCS RES ResetCLK OUT NMI Oden O IC8 CXD1095QVDD O CXD1095Q IC8 pin signal Oden Reset CLR ResetPC1 CPFC1 OUT PC2 CPEC2 OUT Start/stop control circuit Detector circuit of sensor signalSEL C SEL B SEL a SEL a SEL B SEL C Heater lamp control circuit Stepping motor drive circuit Driver circuit Solenoid, electromagnetic clutchOperation Load AE Auto Exposure sensor circuit Reset IC IC13Toner supply motor drive circuit CW/CCW KI0 KI1 Operation panelKI2 CPU Hound AC Circuit EnergyStar circuit description ADU circuit description ADU circuit block diagram ROM RAM ADU CPU IC1 DSR TXDRES Stby ADU motor DDM drive circuit Stepping motor PAM1, PAM2 drive circuit GND