Samsung ML-1755 Service Manual page 28

4) Length of Power Cord
- 1830 ± 50mm
5) Power Switch
- Use
6) Feature
- Insulating resistance : over 50MΩ (at DC500V)
- Insulating revisiting pressure : Must be no problem within 1min. (at 1500Vzc, 10mA)
- Leaking voltage : under 3.5mA
- Running voltage : under 40A peak (at 25°c, Cold start) Under 60A peak (in other conditions)
- Rising Time : Within 2Sec
- Falling Time : Over 20ms
- Surge : Ring Wave 6KV-500A (Normal, Common)
7) Environment Condition
- Operating temperature range : 0°c ~ 40°c
- Maintaining temperature range : -25°c ~ 85°c
- Maintaining humid range : 30% ~ 90% RH
- Operating atmospheric pressure range : 1
8) EMI Requirement
- CISPR ,FCC, CE, MIC, C-Tick,
9) Safty Requrement
- IEC950 UL1950, CSA950, C-UL,NOM,TUV,Semko,Nemko,iK,CB, CCC(CCIB),GOST, EPA,
4.5.3 Fuser AC Power Control
Fuser (HEAT LAMP) gets heat from AC power. The AC power controls the switch with the Triac, a semicon-
ductor switch. The 'On/Off control' is operated when the gate of the Triac is turned on/off by Photo triac
(insulting part).
In the 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 'HEATER ON' signal is turned on at engine, the LED of PC1 (Photo Triac) takes the voltage and
flashes. From the flashing light, the Triac part (light receiving part) takes the voltage, and the voltage is sup-
plied 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 PC1 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 (THY1) feature
- 12A,600V SWITCHING
2) Phototriac Coupler (PC3)
- Turn On If Current : 15mA ~ 50mA(Design: 16mA)
- High Repetive Peak Off State Voltage : Min 600V
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