Dell 1815dn Service Manual - Page 30

System Outline 4.1.8 Telephone Section Speed Dial: On-hook Dial (manual fax): Last Number Redial: Automatic Redial: Pause: Ringer Volume: Tone/Pulse: 400 Locations (46 digits maximum per location) Yes Yes Yes Yes (using Redial key) Off, Low, Medium, High Selectable (Tech Mode Only no Telecom certification for Pulse mode) 4.1.9 SMPS & HVPS SECTION The SMPS supplies DC Power to the System. It takes 110V/220V and outputs the +5V, +24V to supply the power to the main board and ADF board. The HVPS board creates the high voltage of THV/MHV/Supply/Dev and supplies it to the developer part for making best condition to dis play the image. The HVPS part takes the 24V and outputs the high voltage for THV/MHV/BIAS, and the outputted high voltage is supplied to the toner, OPC cartridge, and transfer roller. HVPS (High Voltage Power Supply) Transfer High Voltage (THV+) Input Voltage: 24 V DC 15% Output Voltage: MAX +5.0KV Duty Variable,) -1.2KV 15% () Output Voltage Trigger: 6.5 Line Regulation : under 3% (fluctuation input 21.6V ~ 27.6V) Output Voltage Rising Time 50ms Max Output Voltage Falling Time : 100 ms Max Fluctuating transfer voltage with environmental various : +650 V(Duty 10%) ~ 5 KV (Duty 90%) Environment Recognition Control Method : The THV-PWM ACTIVE is transfer active signal. It detects the resistance by recognizing the voltage value, F/B, while permits the environmental recognition voltage. Output Voltage Control Method : Transfer Output Voltage is outputted and controlled by changing Duty of THVPWM Signal. 10% Duty : +650V, 90% Duty : +5KV 4-12 Service Manual