Canon imageRUNNER ADVANCE C255 Series, Service Manual, Page: 674 / 987

COPIER (Service mode for copier) > ADJUST (Adjustment mode) > HV-TR
1TR-TK42 2 Bk-c pry trns ATVC tgt crrnt: other ppr
Detail To adjust the offset of the target current value for Bk-color (in full color mode) upon primary transfer
ATVC control for other types of papers.
Increase the value when spots, mottled image, or image failure due to insufficient transfer current
occurs.
Decrease the value when image fogging due to transfer memory or drum memory due to strong
transfer current occurs.
Use Case When an image failure due to the primary transfer occurs
Adj/Set/Operate Method 1) Enter the setting value (switch negative/positive by -/+ key) and press OK key.
2) Turn OFF/ON the main power switch.
Caution To reflect the setting immediately, execute primary ATVC control.
Display/Adj/Set Range -50 to 50
Unit uA
Default Value 0
Related Service Mode COPIER> FUNCTION> MISC-P> 1ATVC-EX
Amount of Change per
Unit
2
1TR-TK43 2 Bk-c pry trns ATVC tgt crrnt:pln/rcycl 3
Detail To adjust the offset of the target current value for Bk-color (in full color mode) upon primary transfer
ATVC control for plain paper 1, 2/recycled paper 1, 2 (which paper width is smaller than A4), plain
paper 3, or recycled paper 3.
As the value is incremented by 1, the offset is increased by 2 micro A.
Increase the value if spots (white spots), leopard pattern image occurs.
Decrease the value if white spots occur.
Decrease the value if mottled image due to paper surface nature occurs when paper type is heavy
paper 1/2.
Use Case When an image failure due to the primary transfer occurs
Adj/Set/Operate Method 1) Enter the setting value (switch negative/positive by -/+ key) and press OK key.
2) Turn OFF/ON the main power switch.
Caution To reflect the setting immediately, execute primary ATVC control.
Display/Adj/Set Range -50 to 50
Unit uA
Default Value 0
Related Service Mode COPIER> FUNCTION> MISC-P> 1ATVC-EX
COPIER> ADJUST> HV-TR> 1TR-TGK4
Supplement/Memo For iR-ADV C250 series, adjustment results by 1TR-TGK4 and 1TR-TK43 are linked with each
other so that their values are the same.
Amount of Change per
Unit
2
2TR-N1-1 1 Sec trn ATVC ctrl ppr allot V: pln1 1st
Detail To adjust the paper allotted voltage applied to the 1st side of plain paper 1 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.
Display/Adj/Set Range -128 to 127
Unit V
Default Value 0
Amount of Change per
Unit
30
8. Service Mode
663