Dell 1815DN service manual Telephone Section, Hvps High Voltage Power Supply

System Outline

4.1.8 Telephone Section

Speed Dial:	400 Locations (46 digits maximum per location)
On-hook Dial (manual fax):	Yes
Last Number Redial:	Yes
Automatic Redial:	Yes
Pause:	Yes (using Redial key)
Ringer Volume:	Off, Low, Medium, High
Tone/Pulse:	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 : under3% (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

4-12Service Manual