Canon imageRUNNER ADVANCE C255 Series, Service Manual, Page: 687 / 987

COPIER (Service mode for copier) > ADJUST (Adjustment mode) > HV-TR
2TR-TH-2 1 Sec trn ATVC ctrl ppr allot V: thin 2nd
Detail To adjust the paper allotted voltage applied to the 2nd side of thin paper at secondary transfer
ATVC control.
When mottled image occurs, increase the value if it is due to insufficient secondary transfer current
and decrease the value if it is due to overcurrent.
Use Case When adjusting the secondary transfer bias individually according to paper type and 1st/2nd side
Adj/Set/Operate Method Enter the setting value (switch negative/positive by -/+ key) and press OK key.
Caution Use this item only when an image failure occurs.
Display/Adj/Set Range -128 to 127
Unit V
Default Value 0
Amount of Change per
Unit
30
T2TR-TH 2 Adj of leading edge weak bias:thin paper
Detail To adjust the offset of the leading edge weak bias for thin paper.
Decrease the value if white spots occur.
Increase the value if density on the leading edge of paper is low (transfer is weak).
Use Case When an image failure (white spots at the leading edge) occurs
Adj/Set/Operate Method Enter the setting value (switch negative/positive by -/+ key) and press OK key.
Caution Use this item only when an image failure occurs.
Display/Adj/Set Range -128 to 127
Unit V
Default Value 0
Amount of Change per
Unit
30
■ FEED-ADJ
COPIER (Service mode for copier) > ADJUST (Adjustment mode) > FEED-ADJ
REGIST 1 Adj registration start timing: PS200/135
Detail To adjust the timing to turn ON the Registration Motor at process speed of 200 mm/sec and 135
mm/sec.
As the value is incremented by 1, the margin on the leading edge of paper is increased by 0.1 mm.
+: Leading edge margin becomes larger. (An image moves downward.)
-: Leading edge margin becomes smaller. (An image moves upward.)
When replacing the DC Controller PCB/clearing RAM data, enter the value of service label.
Use Case
When replacing the DC Controller PCB/clearing RAM data
Adj/Set/Operate Method Enter the setting value (switch negative/positive by -/+ key) and press OK key.
Caution With a 25-ppm machine, only the timing at process speed of 135 mm/sec can be adjusted (the
setting for process speed of 200 mm/sec is disabled).
Display/Adj/Set Range -50 to 50
Unit mm
Default Value 0
Amount of Change per
Unit
0.1
8. Service Mode
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