Canon iR C3200 Series Service Manual page 821

16.3.2.7.7 White spots along trailing edge of halftone image on the 2nd side of duplex print made
after generating several sheets of simplex print in a high humidity environment (e.g. for the first
time in the morning)
Symptom
In a high humidity environment, a white spot occurs along the trailing edge of a halftone image on the 2nd side
of a double-sided print made after generating a single-sided print and turning on the power (e.g., for the first
time in the morning).
Cause
The fixing heat causes the moisture in the paper to evaporate, causing condensation on the delivery guide; if it
moves to the leading edge of the 1st side of a double-sided print, a transfer fault will occur along the trailing
edge of the 2nd side.
Field Remedy
Allow about 10 min between making a single-sided print and making a double-sided print so as to prevent
condensation on the delivery guide (thus the symptom).
16.3.2.7.8 White spots in a print made after power-on (e.g., for the first time in the morning) in a low
humidity environment
Symptom
A white spot occurs in a print made after power-on (e.g., for the first time in the morning) in a low humidity
environment.
Cause
The resistance of the secondary transfer external roller is too low, causing the voltage lower limit limiter to go
ON (the level of the secondary transfer current is too high)
Field Remedy
With care, make use of the following in service mode: COPIER>ADJUST>HV-TR>2TR-TGT/2TR-SHR/TR-
ENV/TR-PPR/TR-CLR/TR-DUP.adverse effect of changing the setting: toner can move astray, worsening
white spots.
16.3.2.7.9 White spots along the trailing edge: when feeding dry paper (e.g., freshly opened paper)
Symptom
White spots occur along the trailing edge when dry paper is used (e.g., fresh out of package).
Cause
When the trailing edge of paper moves past the nip area of the secondary transfer external roller, the current
flowing to the trailing edge of the paper is limited.
Chapter 16
0002-3429
0002-3433
0002-3455
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