Dell 5330dn - Workgroup Laser Printer B/W, Service Manual

Page: 36 / 204

Product spec and feature
2-25
Service Manual
2.2.3.2 SMPS & HVPS board
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. The HVPS board
creates the high voltage of THV/MHV/Supply/Dev and supplies it to the developer part for making best
condition to display 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.
1) HVPS (High Voltage Power Supply)
• Transfer Current
□ Input Current : 24 V DC ± 15%
□ Output Current : MAX +40
໡
(+4.5KV) ±3%,(Duty Variavle)
-1 KV ±20% (when cleaning,200
໱
)
□ Input contrast of the Current stability degree : under ± 3 % (fluctuating input 21.6V~27.6V)
Loading contrast : ± 3 % or less
□ Output Current Rising Time : 100 ms Max
□ Output Current Falling Time : 100 ms Max
□ Fluctuating transfer Current with environmental various : +1 ໡ ~ 40 ໡ (+400V~+4.5KV)
□ Environment Recognition Control Method : The THV-PWM ACTIVE is transfer active signal. It
detects the resistance by recognizing the Current
value, F/B, while permits the environmental recognition
voltage.
□ Output Current Control Method : Transfer Output Current is outputted and controlled by changing
Duty of THVPWM Signal.
• Charge Voltage (MHV)
□ Input Voltage : 24 V DC ± 15%
□ Output Voltage : -1.1KV ~ -1.5KV DC ± 50V
□ Output Voltage Rising Time : 50 ms Max
□ Output Voltage Falling Time : 50 ms Max
□ Output Loading range : 30 MΩ ~ 1000 MΩ
□ Output Control Signal(MHV-PWM) : CPU is HV output when PWM is Low
• Cleaning Voltage (THV-)
□ The (+) Transfer Voltage is not outputted because the THV PWM is controlled with high.
□ The (-) Transfer Voltage is outputted because the THV-Enable Signal is controlled with low
□ The output fluctuation range is big because there is no Feedback control.
• Developing Voltage (DEV)
□ Input Voltage : 24 V DC ± 15%
□ Output Voltage : AC+DC Vp-p 550V ~ 2.4KV
□ Output Voltage Fluctuation range: PWM Control
□ Output Voltage Rising Time : 50 ms Max
□ Output Voltage Falling Time : 50 ms Max
□ Output Load : About 68pF (Standard load)
□ Output Control Signal : DEV AC-PWM / DEV AC-Vpp PWM /DEV AC-ON / DEV DC PWM
• Supply
□ Output Voltage : Vp-p 550V ~ 2.4KV (ZENER using, DEV)
□ Output Voltage Rising Time : 50 ms Max
□ Output Voltage Falling Time : 50 ms Max
□ Output Load : About 68pF (Standard load)
□ Output Control Signal : DEV AC-PWM / DEV AC-Vpp PWM /DEV AC-ON / DEV DC PWM