Telephone Section - Dell 1815 Mono Laser Service Manual

System Outline

4.1.8 Telephone Section

Speed Dial:
On-hook Dial (manual fax):
Last Number Redial:
Automatic Redial:
Pause:
Ringer Volume:
Tone/Pulse:
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
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
Service Manual
4-12
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)
15%