System Overview
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Service Manual
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3. System Overview
3.1 System Layout
The SCX-4521F/4321 is roughly made up Main Control part, Operation Panel part, Scanner part, Line
Interface part and Power part. Each Part is separated Module which focus on common and standard design
of different kind products. main control part adopting Fax & LBP Printer exclusive Controller is chorus2
CPU(ASIC) and 1 Board. Scanner part is composed of ADF and Platen and is connected with Main by
Harness.
ADF ROLLER
Scanner part
Engine Part
ADF-UPPER
PICK-UP ROLLER
EXIT ROLER
WHITE BAR
ADF-GLASS
FEED ROLLER
SCAN UPPERSCAN UPPERSCAN UPPER
ADF-LOWER
COVER OPEN
BIN PATH
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3.1.1 Feeding section
There is a universal cassette which automatically loads paper and the manual feed which supplies paper
single sheet at a time. The cassette has a friction pad which separates paper to ensure single sheet
feeding, and it has a sensor, which checks when the paper tray is empty.
- Feeding Method: MP Cassette Type
- Feeding Standard: Center Loading
- Feeding Capacity: Cassette-150 sheets (75g/m2, 20lb paper standard)
Manual 1 sheet (Paper, OHP, Envelop, etc.)
- Paper detecting sensor: Photo sensor
- Paper size sensor: None
3.1.2 Transfer Ass’y
This consists of the PTL (pre-transfer lamp) and the Transfer Roller. The PTL shines a light onto the OPC
drum. This lowers the charge on the drum’s surface and improves transfer efficiency.
The transfer roller transfers toner from the OPC drum surface to the paper.
- Life expectancy: Over 50,000 sheets (at 16~30°C)
3.1.3 Driver Ass’y
- Gear driven power unit. The motor supplies power to the paper feed unit, the fuser unit, and the toner
cartridge.
3.1.4 Fixing Part(Fuser)
- The fuser consists of the Heat Lamp, Heat Roller, Pressure Roller, Thermistor, and Thermostat. It fixes
toner to the paper using pressure and heat to complete the printing job.
3.1.4.1 Temperature-Intercepting Device (Thermostat)
The thermostat is a temperature sensing device, which cuts off the power to the heat lamp to prevent
overheating fire when the heat lamp or heat roller overheats.
3.1.4.2 Temperature Detecting Sensor (Thermistor)
The Thermistor detects the surface temperature of the heat roller, this information is sent to the main
processor which uses this information to regulate the temperature of the heat roller.
3.1.4.3 Heat Roller
The surface of the Heat Roller is heated by the Heat Lamp. As the paper passes between the Heat and
Pressure rollers the toner is melted and fixed permanently to the paper. The surface of the roller is coated
with Teflon. This ensures that toner does not adhere to the roller surface.
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3.1.4.4 Pressure roller
The Pressure Roller mounted under the heat roller, it is made of a silicon resin, and the surface of the roller
is coated with Teflon. This ensures that toner does not adhere to the roller surface.
3.1.4.5 Safety Features
• To prevent overheating
- 1st protection device: Hardware cuts off when overheated
- 2nd protection device: Software cuts off when overheated
- 3rd protection device: Thermostat cuts off mains power to the lamp.
• Safety device
- Fuser power is cut off when the front cover is opened
- LSU power is cut off when the front cover is opened
- The temperature of the fuser cover's surface is maintained at less than 80°C to protect the user and a
caution label is attached where the customer can see it easily when the rear cover is opened.
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STACKER
COVER-M-SIDE R
EXTEND-SMALL
EXTEND-LARGE
TRAY CASSETTE
COVER-M_DEVE
FIXING BKT
SPEKER
COVER-M-SIDE-L
COVER-M_REAR
COVER-M_JAM
COVER-M_MIDDLE
SCAN
UPPER
MOTOR
ASS’Y
SCAN
LOWER
TIMING
BELT
CIS
SLIDER
-CIS
ADF
GLASS
SCAN
GLASS
KEY & OPE
COVER
[Case part figure]
[Scan part figure]
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3.2 Engine H/W Specification
1) Recording Method : LSU(Laser Scanning Unit)
2) Printing Speed : 20ppm
(In continuing printing base Letter, printing pages from 2nd to last during 1min)
3) Recording Density : 600 dpi
4) Cassette Capa. : Cassette ; 150sheets(75g/ Base), 1-sheet Feeding : N/A((DRIVE Selection : Paper, OHP,
Envelop - 1 sheet)
5) Manual Tray : All paper 1 sheet
6) Paper Size : Cassette ,Manual ; Width = 76 ~ 216mm, Length = 125mm ~ 356mm
7) Effective recording size
- A4 :202 x 291 mm
- Letter :208 x273mm
- Legal : 208 x 350 mm
- Folio : 208 x 325 mm
- TopMargin: 2 2 mm
- Left, Right Margin : 2
2 mm
8) CRU(Toner Cartridge)Life : 3,000pages Printing(A4, ISO 5% Pattern Printing)
9) First Print Out Time : within 11sec ( Standby )
10) Warming up time : within 35sec (Ambient : 25 °C)
3.2.1 Main Board Control Part
Main control part of SCX-4521F is made of ASIC(CPU, Image processor, PC I/F part include, Scan interface part,
FAX Modem part and Printing process I/F part. CPU handles the BUS control, I/O interface, scan interface, PC
interface and other miscellaneous driver circuit.
1) Main Board
- Main Board has a function of sending Current Image Video Data to LSU of the machine, controlling motor
Driving Circuit and monitoring Paper Exit Sensor, Cover Open switch, OPE Panel Inputs.
2) Main Controller
- CPU : Chorus2 is the main CPU and is made up on the 16/32bit RISC architecture using ARM7TDMI
core. Main CPU controls the whole system according to the program code which stored in the
Flash-ROM memory.
- Summary of the Key Function Block:
1.8V for internal Core, 3.3V for I/O Pad with 4KByte Cache.
Image Processor included.
On-Chip clock generator with PLL.
Memory and External Bank Control.
DMA Control (5-Channel)
Interrupt Control.
2-port USB Host/1-port USB device(ver 1.1) interface control.
Parallel interface control.
UART(2-Channel)
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Synchronous Serial Interface Control.
A/D Converter(10-bit, 2channel).
General I/O Port control.
Tone Generator.
RTC with calendar function.
S/W Assistant function(Rotator)
- Flash Memory : Stores system program and can be updated to the newer system program code through
the PC interface. It stores the FAX Journal List, One Touch dial number, speed dial number, and machine
configuration setup data.
Capcity : 2 Mbyte
Access Time : 70 nsec
- SDRAM : SDRAM is used for Print Buffer, Scan buffer when scanning, ECM Buffer when FAX Receiving,
and system working memory.
Capacity : 16 Mbyte
Access Time : 66MHz based on system bus clock.
Data Backup : 72 Hours
Backup Battery Charging Time : 100hours when completely discharged.
3.2.2 Scan Part
1) Image Signal Input Part
- Image Signal from CIS has a level of about 1.2V and is goes to ADC of Chorus2.
After ADC, CIS analog signal will be converted to 8-bit Digital signal.
2) Image Processing
- On the surface of the original paper, the light from the CIS LED reflected and goes to the CIS Sensor.
Then the light is converted to the appropriate voltage suitable for ADC input. Analog signal from CIS
sensor is used for ADC input then is converted to 8-bit digital data. Image processor of the Chorus2 will
do the Shading correction function at first, then Gamma correction function next. After then, the data goes
to different module according to the copy or FAX resolution mode. When Text mode, the image data
goes to LAT module, when Photo mode, the image data goes to Error Diffusion module, when PC-Scan
mode, the image data goes directly to the PC through DMA access.
Summary of the Image sensor interface is as below;
- Minimum Scan Line Time :1.5ms
- Scan Resolution : 600*600 dpi
- Scan Width : 208mm
- Function
White Shading Correction
Gamma Correction
CIS Interface
256 Gray Scale
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3) CIS Driving Part
- CIS Supply Voltage : +3.3V
- CIS Max frequency : 5MHz
- CISLinetime
Fax/Copy - 1.5ms
PC-Scan - 4.5ms
- White output volt. : Max 0.8V
4) ADF Driving Part : Driving ADF Stepper motor, and the maximum motor speed is 2000PPS.
- MOTOR DRIVER : A3978(Allegro)
- Driving Voltage : 24V DC
- Phase : 2-2 Phase 2000PPS at Quick Scan,
2-2 Phase 1000PPS AT Fine Scan,
2-2 Phase 667PPS AT Super Fine Scan
3.2.3 Fax Modem Part
1) Modem Part
The modem part is consist of FM336(FAX Modem chip), LIU(Line Interface Unit) and modem analog front
end(AFE) functional part.
- The feature of the FM336 modem chip is as below;
Communication Mode : Half Duplex
Modem Method
GROUP 3 : ITU-T V34, V17, V29, V27ter
Tonal Signal : ITU-T T.30
Binary Signal : ITU-T V.21, T.30
Image Transmission Time : 3sec ( ITU-T NO.1 CHART/Memory Tx/ECM )
Data Compress : MH, MR, MMR, JPEG
Modem Speed : 33600 / 28800 / 14400 / 12000 / 9600 / 7200 / 4800 / 2400 bps
Receive Level : 0 ~ -48dBm
Output Level
Adjustable : -6 ~ -15dBm ( 1dBm Step )
Initial Setting : -12dBm
Receive dynamic range:
0 dBmto-43 dBmfor V.17,V.29,V.27 ter and V.21
-9 dBm to -43 dBm for V.34 halfduplex
2) The Gain of the Line signal can be adjusted by setting the register value of the FAX modem chip ,Tx and Rx path
is almost directly connected to the impedance matching transformer of the LIU.
- Adjust Tx Level within Setting Level+0,-2dB range.
- Adjust Rx Level that has the same level as the TIMS out level if possible, and must not exceed the TIMS
out level.
3) Speaker Driving Part
Analog Switch(MC14053BD) makes a path for FAX Tone, Ring, Key click sound and Analog MUX
(MC14051) makes a different signal level so that the the Speaker driver chip(MC34119) can driving the
Speaker with different sound volume.
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3.2.4 Printing Process Part
Printing Process part is made of PC-Interface part, PVC(Priter Video Controller), LSU control part, High Voltage
control part and Fuser Unit control part. PC-interface core is included in the Chorus2 ASIC and controls the PCinterface. LSU control part controls the LSU polygon motor, Laser diode, video data output so thatthe printing image
can be made up on the OPC Drum.
3.2.5 Line Interface Part
Line interface part helps the machine connect to the PSTN or PABX Line and is made of almost primary circuit.
Its main function is Line connection, Line state monitoring and TAD interface that enables a extension telephone or
TAD machine to connect to the SCX-4521F machine.
3.2.6 Engine Paper Feeding
1) Feeding Type : MP Cassette Type
2) Feeding Standard : Center Loading
3) Feeding Qty : Cassette 150 sheets (75g/ , 20lb paper standard)
4) 1 sheet (Paper, OHP, Envelope etc.)
5) Separating Type: Cassette - Friction Pad Type
6) Manual Tray : 1 sheet
7) Driver Type : Driving by Gearing from Main Motor
8) Pick_up Roller Driver : Solenoid
9) Pick up Roller Rubber Material : EPDM+IR =1.3 or more
10) Pick up Velocity : 94.8731mm/Sec (Process : 93.0667mm/sec)
11) Paper detecting Sensor : Photo Sensor
12) Paper Size Sensor : None
13) Paper Separating Pad Material : NBB 52 °, =0.8~1.2
14) Separating Pad Pressure : TBD 150 gf
15) Pick_up Roller RPM : 47.683 RPM
16) Feeding Pressure (Same as Transfer Roller)
17) Paper Exit Type : Face Down
18) Feed Roller Force : TBD Kg.f or more.
19) Spring Feed Tensile Force : TBD gf
20) Feed roller Velocity : mm/sec
21) Feed Roller Material
22) Exit Sensor : Photo Sensor
OPC Drum
Photo Diode
LD Driver circit
Protector panel
LD(Laser Diode)
Polygon Mirror
Polygon Motor
Motor Driver
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3.3 Deverope Process
- Developing Method : Non magnetic 1 element contacting method
- Toner : Non magnetic 1 element shatter type toner
- Toner Qty:35gf /60gf (1k/3k)
- The life span of toner 1k/3k sheets (ISO 5% Coverage )
- Toner Residual Sensor : None
- OPC Cleaning : Use the conventional cleaning blade
- Handling of wasted toner : Discard by collecting waste-toner at waste-toner bin.
- OPC Drum Protecting Shutter : None
- Classifying device for toner cartridge: ID is classified by interruption of the frame channel.
- Development Roller type : conductive elastic roller
- Doctor BLADE Type : Regulating toner layer by pressure
- Charge Roller Type : Conductive Roller Contact-Charge
3.3.1 Fuser Specification
1) Heat Lamp
- Heat Lamp Terminal Shape : Terminal Single Type
- Voltage 120 V : 115 5 %, 220 V : 230 5 %
- Capacity : 600 Watt 30 W
- Light Qty Distribution : 140%
- Life : 3000 Hr
2) Thermostat
- Thermostat Type : Non-Contact type THERMOSTAT
- Control Temperature : 150°C 5°C
3) Thermistor
- Thermistor Type : HF-R0060 (SEMITEC 364FL Type)
- Temperature Resistance : 7 k (180 °C)
- SYSTEM Temperature SETTING
Stand by : 165 5°C
Printing : 175 5°C(5 minutes before)
170°C
5°C(5 minutes after)
Overshoot: 200°C or less
Overheat :210°C or less
4) Safety Relevant Facts
- Protecting device when overheating
1st protecting device : H/W cuts off when detecting an overheating
2st protecting device : S/W cuts off when detecting overheating
3st protecting device : Thermostat cuts off the power
- Safety device
The power of Fuser is cut-off after front cover is open.
The overheating safety device for customer
The surface temperature of the Fuser Cover is under 80°C
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3.4 Sanner Part
600dpi Color CIS Module for Flat bed, SCX-4521F uses the CIS scanning method
1) CIS SPEC
- Scanning size : 216 mm ( width for letter-size)
- Light source : LED
- Scanning sensor: CIS 600/300 dpi
- Scanning mode : Color SCAN / Mono SCAN
- MTF : 30% (300 dpi Chart)
- CIS interface : Analog output
- Power supply : 3.3V
- Clock Frequency: 5MHz max.
- Number of output : 1
- LED Current : Red/Green/Blue : 60mA
- Clamp Level : 1.1V
- Connection : 12 pin FFC connector (pitch 1.0mm)
2) Scan Resolution
(a) Transmission
- Normal : Vertial: 3.85 Line/mm, Horizontal: 8 Pels/mm :203 x 98dpi
- Fine : Vertial: 7.7 Line/mm, Horizontal: 8 Pels/mm :203 x 196dpi
- Super Fine : Vertial: 11.8 Line/mm, Horizontal: 11.8 Pels/mm ;300 x 300dpi
(b) When Copy : Vertial: 11.8 Line/mm, Horizontal: 23.6 Pels/mm :600x300dpi(ADF)
Vertial: 23.6 Line/mm, Horizontal: 23.6 Pels/mm :600x600dpi(Platen)
3) Half Tone (Gray Scale) : 256 Levels
4) Scan Line Time
(a) Tx
- Normal : 1.5 ms/Line
- Fine : 1.5 ms/Line
- Super Fine : 1.5 ms/Line
(b) Copy : 1.5 ms/Line
(c) Scan
- Color : 4.5msec/line
- Gray : 4.5msec/line
- Mono : 4.5msec/line
5) Scanning Width
- MAX SCAN WIDTH : 216 mm (8.5 inches)
- Effective Scan Width: 208mm
6) ADF Motor
(a) Motor Spec
- : 24VDC
- : 0.6A(Peak)
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7) Motor Driver speed & method
(a) FAX Transmission
- Normal Mode : 2000 pps
- Fine Mode : 1000 pps
- Super Fine Mode : 667 pps
(b) Copy Job : 667 pps, 2-2
- max(30sheets) : 50gf
- min(1sheets) : 20gf
8) Document Detect sensor
(a) Type : Photo interrupt
(b) Position : ADF PBA
(c) LED - max current : 50mA
- max voltage : 3.3V
(d) Output - Logic "H" : No Paper
- Logic "L" : Paper
(e) Lever-Sensor DOC : ADF Lower Torsion Spring
9) Regi Detect sensor
(a) Type : Photo interrupt
(b) Position : ADF PBA
(c) LED - max current : 50mA
- max voltage : 3.3V
(d) Output - Logic "H" : No Paper
- Logic "L" : Paper
(e) Lever-Sensor DOC : ADF Lower Torsion Spring
10) Document Scan sensor
(a) Type : Photo interrupt
(b) Position : ADF PBA
(c) LED : - Max current : 50mA
- Max Voltage : 3.3V
(d) Output - Logic "H" : Off(No Position), No Paper
- Logic "L" : On (Doc Position), Paper
(e) LEVER - SENSOR SCAN : Scan Lower Torsion Spring
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3.5 OPE(Operational Panel Equipment)
1) Ope Panel
OPE Panel has a MICOM Chip on it and communicates with Main CPU using Serial communication
Line(SIO). OPE Panel consists of Micom, Key Matrix Part, LED Driving Part and LCD Part.
2) Key Description
3) LCD Part
- Number of Characters : 16 Characters x 2 line
Clock, Date display
System Status display
Alarm, Error Message display
Function Dialog Message display
No Part Feature Function
1 Common 3*4Key Dialing and Option Input
Start Starting Fax/Copy Job
Stop/Clear Cancel Current Job/Return to default
Menu Option select
Upper Level Return to upper level menu
Enter Option select/Execute
Next menu or Next option item
Previous menu or Previous option item
2 Save Toner Save TONER SAVE MODE select
3 Copy Reduce/Enlarge Select ZOOM ratio when copy
No.of Copies Select the number of copies
Original Type Change Copy Modes(Text,Text/Photo,Photo)
Darkness
Change the Darkness of the Copied image (Light/Normal/Dark)
Favorite Copy Select one of the predefined Copy templates.
4 Fax Resolution STANDARD>FINE>SUPER
FINE>PHOTO>COLOR
Phone Book Search the user defined Phone number.
Broadcasting When sending FAX data to many place in the same time.
On Hook Dial On Hook Dial
Redial / Pause Last number Redial / Pause
5 Scan Scan to select [scan to PC], [scan to FAX], [scan to E-mail] function.
U1
U3
12.0MHz
U8
U9
U12
U10
U7
U5
(IC-DRAM/
512K x 16Bit)
(IC-POSI, ADSUST REG)
(IC-CMOS LOGIC, INVER TER)
(IC-MOTOR DRIVER)
(IC-VOLTAGE COMP)
(IC-CLOCK GENERATOR)
(IC-EEPROM/256x12Bit)
(IC-POSI, FLXED REG)
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3.6 SMPS & HVPS
It is the power source of entire system. It is assembled by an independent module, so it is possible to use for
common use. It is mounted at back of the machine. Power part is divided by two independent PBAs - SMPS PBA
and HVPS PBA. SMPS PBA supplies the DC power for driving the system and supplies the AC power to the fuser.
SMPS has two output channels : +5V and +24V. HVPS PBA supplies High voltage to the developer part to make a
printing image on the paper. High voltages applied to the MHV, THV, DEV, SUPPLY.
3.6.1 SMPS
1) AC Input
- Input Rated Voltage : AC 220V ~ 240V / AC 110V ~ 127V
- Input Voltage fluctuating range: AC 180V ~ 270V / AC 100V ~ 135V
- Rated Frequency : 50/60 Hz
- Frequency fluctuating range : 47 ~ 63 Hz
- Input Current : Under 4.0Arms / 2.5Arms
(But, the status when lamp is off or rated voltage is inputted/outputted )
2) Rated Output Power
3) Consumption Power
NO Items CH1 CH2 Remarks
1 CHANNEL +5V +24.0V
2 CONNECTOR PIN CON 2 CON 2 Jam cover switch
5V PIN : #5pin 24V PIN: #2, #3, #4 included
GND PIN: #6pin GND PIN: #7pin
3 Rated Output +5V ± 5%(4.75 ~ 5.25V)
+24V -10%/+15%(21.6V ~ 27.6V)
4 Max. Output current 0.8 A 2.5 A
5 Peak Loading current 1.0 A 2.7 A
within 1ms Duration
6 RIPPLE NOISE Voltage 100mVp-p or less 500mVp-p or less
7 Maximum output 2.5W 36W
8 Peak output 4W 55.2W 1ms
9 Protection for loading Fuse Protection or Shutdown Fuse Protection or Shutdown
shortage and within 1.5A ~ 3.0A range. within 3.5A ~ 4.5A range.
overflowing current
NO Item CH1(+5V) CH2(24V) System
1 Stand-By 0.6 A 1.3 A AVG : 65Wh
2 Printing 0.8 A 1.9 A AVG : 350Wh
3 Sleep-Mode 0.5 A 0.3 A AVG : 10Wh
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4) Power Cord Length : 1830 50mm
5) Power Cord Switch : Exist
6) Feature
- Withstand Resistance : 100 or more (at DC 500V)
- Insulating revisiting pressure : Must be no problem within 1 min. (at1000Vac,10mA)
- Leaking Current : under 3.5mA
- Running Current : under 40A PEAK (AT 25 °C,COLDSTART)
under 50A PEAK (In other conditions)
- Rising Time : within 2Sec
- FallingTime : over 20ms
- Surge : Ring Wave 6KV-500A (Normal, Common)
7) Environment Condition
- Operating temperature range : 0 °C ~ 40 °C
- Maintaining temperature range : -20 °C ~ 40 °C
- Preserving Humidity Condition : 10% ~ 90% RH
- Operating atmospheric pressure range : 1atm
8) EMI Requirement : CISPR, FCC, CE, MIC,
9) Safety Requirement : IEC950 UL1950, CSA950, C-UL, Semko, EK, CB, CCC(CCIB),GOST, EPA,
3.6.2 HVPS Board
The HVPS board creates the high voltage of THV/MHV/Supply/Dev and supplies them to the developer part for
making best quality printing image. The HVPS part takes the 24V and outputs the high voltage such as
THV/MHV/Supply/Dev, and the outputted high voltage is supplied to the toner, OPC cartridge, and transfer roller.
(a) Transfer High Voltage (THV+)
- Input Voltage : 24 V DC +15% / -10% (21.6V~27.6V)
- Out Voltage : +1300KV 1.5% (200 Load )
- Out Voltage Trigger : 6.5
- Input Voltage Variation : 5 %
Load Variation :
5 %
- Out Voltage Rising Time : 100 ms Max
- Out VoltageFalling Time : 100 ms Max
- Transfer Variation Voltage on Environment Variation : +500 V ~ +5000V
- Control Method on environment : THV-PWM ACTIVE, transfer Active signal, of environment sensing
voltage is input and get feed back current, and recalculate it to resistance .
- Control method on transfer output voltage : It is controlled by changing its duty of THVPWM Signal as
follows. 10% Duty : +500V, 90% Duty : +5000V
(b) Charge Voltage (MHV)
- Input Voltage : 24 V DC +15% / -10% (21.6V~27.6V)
- Out Voltage : -1300KV 50V(50 Load)
- Out Voltage Rising Time : 50 ms Max
- Out VoltageFalling Time : 50msMax
- Out Voltage Range : 30 ~ 1000
- Output Control Signal(MHV-PWM) : Active Low PWM signal for controlling MHV
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(c)Developing Voltage (DEV)
- Input Voltage : 24V DC +15% / -10% (21.6V~27.6V)
- Output Voltage: -350V 20V (50 Load)
- Output Voltage Fluctuation range: PWM Control
- Input contrast of the output stability degree : 5 %orless
- Loading contrast : 5 %orless
- Output Voltage Rising Time : 50 ms Max
- Output Voltage Falling Time : 50 ms Max
- Output Loading range : 10 ~1000
- Output Control Signal (BIAS-PWM) : Active Low PWM signal for controlling MHV
(d) Supply
- Output Voltage : -550V 50V(50 Load)
- Input contrast of the output stability degree : under 5 %
- Loading contrast : 5 %orless
- Output Voltage Rising Time : 50 ms Max
- Output Voltage Falling Time : 50 ms Max
- Output Loading range : 10 ~ 1000
- Output Control Signal (BIAS-PWM) : Active Low PWM signal for controlling MHV
3.7 FUSER AC POWER CONTROL
The Fuser(HEAT LAMP) gets heat from AC power. The AC power controls the switch with the Triac, a
semiconductor switch. The 'ON/OFF control' is operated when the gate of the Triac is turned on/off by Phototriac
(insulting part). In other words, the AC control part is passive circuit, so it turns the heater on/off with
taking signal from engine control part.
When the 'HEATERON' signal is turned on at engine,the LED of PC102 (Photo Triac) takes the voltage and
flashes. From the flashing light, the Triac part (light receiving part) takes the voltage,and the voltage is supplied to
the gate of Triac and flows into the Triac. As a result, the AC current flows in the heat lamp, and heat is occurred.
On the other hand, when the signal is off, the PC102 is off, the voltage is cut off at the gate of Triac, the Triac
becomes off, and then the heat lamp is turned off.
1) Triac feature : 12A, 600V SWITCHING
2) Phototriac Coupler (PC102)
- Turn OnIf Current : 15mA~50mA(Design : 16mA)
- High Repetive Peak Off State Voltage : Min 600V
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