Ricoh 002052MIU User Guide - Page 140

Smps & Hvps, 5.1 Hvps High Voltage Power Supply

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SMPS & HVPS (ALSO KNOWN AS PSU AND POWER PACK) 6.5 SMPS & HVPS (ALSO KNOWN AS PSU AND POWER PACK) The SMPS and HVPS are on the same board. The SMPS gives DC power to the system. It gets 110V (NA model) / 220V (EU, AS and China models) and outputs the 5 V, 12 V and 24 V. Then it gives power to the main board and ADF board. The HVPS generates the high voltage of THV/MHV/Supply/Dev for the developer part. The HVPS gets 24V and outputs the high voltage for THV/MHV/BIAS. The output high voltage goes to the toner, OPC cartridge, and transfer roller. 6.5.1 HVPS (HIGH VOLTAGE POWER SUPPLY) Transfer High Voltage (THV+) • Function: Moves developed toner on OPC drum to the paper. • Output voltage: Maximum +5.0 KV ± 5% (Duty changeable, unload) • 1.0 KV ±15% (When you clean, 200 MOhm) • Error: If THV (+) does not output, a ghost image with low density shows. Toner on OPC drum cannot correctly transfer to the paper. Charge voltage (MHV) • Function: Charges the OPC surface of with -900 V ~ -1000 V. • Output voltage: -1.3 KV ~ 1.8 KV DC ± 50 V • Error: If MHV does not output, a black paper is printed. This is because the developing roller moves to a part of the OPC drum that does not get charge. Cleaning voltage (THV-) • Function: Cleans the surface. It sends minus toner from the transfer roller to the OPC drum to get toner. • Output voltage: There is no feedback control. • Error: Toner contamination shows at the backside of a printed-paper. Developing voltage (DEV) • Function: Develops toner with different electronic potential on an exposed part by LSU (Laser Scanning Unit). * The electronic potential of exposed OPC is -180V and exposed developer is -350 V when the machine prints. Toner with minus (-) develops on an exposed part. • Output voltage: -200 V ~ 600 V DC ±20 V • Error: 1) If DEV is GND, density goes down. 2) If DEV floats due to an unstable contact point of terminal, etc., density goes up. B173 6-10 SM

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SMPS & HVPS (ALSO KNOWN AS PSU AND POWER PACK)
B173
6-10
SM
6.5 SMPS & HVPS
(ALSO KNOWN AS PSU AND POWER PACK)
The SMPS and HVPS are on the same board.
The SMPS gives DC power to the system.
It gets 110V (NA model) / 220V (EU, AS and China models) and outputs the 5 V,
12 V and 24 V. Then it gives power to the main board and ADF board.
The HVPS generates the high voltage of THV/MHV/Supply/Dev for the developer
part. The HVPS gets 24V and outputs the high voltage for THV/MHV/BIAS. The
output high voltage goes to the toner, OPC cartridge, and transfer roller.
6.5.1 HVPS (HIGH VOLTAGE POWER SUPPLY)
Transfer High Voltage (THV+)
•
Function: Moves developed toner on OPC drum to the paper.
•
Output voltage: Maximum +5.0 KV – 5% (Duty changeable, unload)
•
1.0 KV –15% (When you clean, 200 MOhm)
•
Error: If THV (+) does not output, a ghost image with low density shows.
Toner on OPC drum cannot correctly transfer to the paper.
Charge voltage (MHV)
•
Function: Charges the OPC surface of with ´900 V ~ ´1000 V.
•
Output voltage: -1.3 KV ~ 1.8 KV DC – 50 V
•
Error: If MHV does not output, a black paper is printed. This is because the
developing roller moves to a part of the OPC drum that does not get charge.
Cleaning voltage (THV-)
•
Function: Cleans the surface. It sends minus toner from the transfer roller to
the OPC drum to get toner.
•
Output voltage: There is no feedback control.
•
Error: Toner contamination shows at the backside of a printed-paper.
Developing voltage (DEV)
•
Function: Develops toner with different electronic potential on an exposed
part by LSU (Laser Scanning Unit).
* The electronic potential of exposed OPC is ´180V and exposed developer
is ´350 V when the machine prints. Toner with minus (-) develops on an
exposed part.
•
Output voltage: ´200 V ~ 600 V DC –20 V
•
Error:
1) If DEV is GND, density goes down.
2) If DEV floats due to an unstable contact point of terminal, etc., density
goes up.