Dell 5330dn - Workgroup Laser Printer B/W, Руководство по обслуживанию

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Product spec and feature
2-27
Service Manual
• Length of Power Cord : 1830±50mm
• Power Switch : Use
• Feature
□ Insulating Resistance : 100 ໱ or more (at DC 500V)
□ Insulating revisiting pressure : Must be no problem within 1 min. (at 1500Vac,10mA)
□ Leaking Current : under 0.75mA
□ Running Current : under 30A PEAK (AT 25
ଇ
, COLD START)
under 50A PEAK (In other conditions)
□ Rising Time : within 2Sec
□ Falling Time : over 20ms
□ Surge : Bi-Wave 6KV-12ohm (Common) 3KV -2ohm(Normal)
• Environment Condition
□ Operating temperature range : 0 ଇG ~ 50 ଇ
□ Maintaining temperature range : -25 ଇG ~ 85 ଇ
□ Preserving Humidity Condition : 30% ~ 90% RH
□ Operating atmospheric pressure range :
3) FUSER AC POWER CONTROL (with 2 Lamp)
Fuser(HEAT LAMP) gets heat from AC power. The AV 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 Photo
triac (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 ‘HEATER ON’ signal is turned on at engine, the LED of U3,U4(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 U3, U4 is off, the voltage is cut off at the gate of Triac, the Triac
becomes off, and then the heat lamp is turned off.
• Triac (Q02, Q03) feature :16A, 800V SWITCHING
• Phototriac Coupler (U3,U4)
□ Turn On If Current : 15mA ~ 50mA(Design :16mA)
□ High Repetive Peak Off State Voltage : Min 800V