Ricoh FAX7000L, Field Service Manual

Page: 254 / 377

Symptom Action
Vertical Black Lines Make a printer test (service function 09, mode 0; see page 2-32). Is the
or Bands Type 4 -
printout normal?
Straight lines or
Y
N
bands at constant Start a copy cycle and stop it just before the copy reaches the
positions on the copy fusing unit. Does the copy have the same lines on it?
Y
N
• Clean the thermistor, hot roller, and hot roller strippers.
• If the hot roller surface is scratched, correct or clean
any parts that are damaging the roller, then replace the roller.
• If the hot roller strippers are badly stained with toner,
replace the thermistor (or the UIB, PSU, SPU, or SCU).
Replace the master unit if the belt is scratched.
Also, correct or replace any parts that may be damaging the belt.
• Clean the corona wires.
• Clean the quenching lamp.
• Replace the toner metering blade if it is deformed.
• Clean the laser optics carefully with a blower brush or soft dry cloth.
• Replace the LSD, UIB, SPU, or SCU.
• Clean the scanner optics and exposure glass.
• Check for error bits in the SBU waveform.
5-19