Ricoh AC205 Service Manual - Page 167

Supply Voltage SUP, OPC Ground ZENER Voltage, Failure Symptom

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SMPS AND HVPS Supply Voltage (SUP): This voltage supplies toner to the developing roller. • Output voltage: -580V DC ± 50V (Use ZENER, DEV Gear) • Failure Symptom: • Print density becomes extremely light when SUP is GND. • Print density becomes extremely light if SUP is "floating", due to poor connection between the frame and cartridge contacts, etc. In this situation prints are difficult to see. OPC Ground ZENER Voltage: This voltage prevents image contamination under low temperature and low humidity environmental conditions. The ZENER diode is connected to OPC ground when a set prints without an output voltage of -130V. DC ± 15V is maintained. • Failure Symptom: • There is no serious image problem in the general environment when the ZENER diode is -0V. However, contamination can still occur on the entire image in low temperature and low humidity environments. • A blank page is printed out when the ZENER diode is disconnected. Detailed Descriptions SM 6-13 B273

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SMPS AND HVPS
SM
6-13
B273
Detailed
Descriptions
Supply Voltage (SUP):
This voltage supplies toner to the developing roller.
•
Output voltage: –580V DC ± 50V (Use ZENER, DEV Gear)
•
Failure Symptom:
•
Print density becomes extremely light when SUP is GND.
•
Print density becomes extremely light if SUP is “floating”, due to poor
connection between the frame and cartridge contacts, etc. In this situation
prints are difficult to see.
OPC Ground ZENER Voltage:
This voltage prevents image contamination under low temperature and low
humidity environmental conditions. The ZENER diode is connected to OPC ground
when a set prints without an output voltage of –130V. DC ± 15V is maintained.
•
Failure Symptom:
•
There is no serious image problem in the general environment when the
ZENER diode is –0V. However, contamination can still occur on the entire
image in low temperature and low humidity environments.
•
A blank page is printed out when the ZENER diode is disconnected.