Canon imageRUNNER ADVANCE 9070 PRO series Service Manual Digest page 450

COPIER> ADJUST> HV-PRI
PRI-FREQ Adjustment of YMC charging AC frequency
Lv.2 Details To adjust the charge AC frequency for Y, M and C.
As the value is smaller, moire is likely to occur.
Use case At a charge failure
Adj/set/operate method 1) Select the items.
2) Enter the setting value, and then press OK key.
Caution • Do not use this at the normal service.
• Be sure to perform discharge current control (COPIER>
FUNCTION> MISC-P> DISCHG) after the execution.
Display/adj/set range 0 to 2
Default value 0
DHT-ON Forcible ON of Drum Heater (Bk)
Lv.2 Details To forcibly turn ON the Drum Heater (Bk) regardless of the
environment when the power is turned ON.
Use case When the density of Bk gets lower at the end of the continuous print
Adj/set/operate method Select the item, and then press OK key.
Caution Do not use this at the normal service.
5
5-222
■ HV-TR
PRE-TR
Lv.1 Details
Use case
Adj/set/operate method Enter the setting value, and then press OK key.
Caution
Display/adj/set range
Unit
Default value
2TR-TGT1
Lv.2 Details
T-5-39
Use case
Adj/set/operate method Enter the setting value, and then press OK key.
Caution
Display/adj/set range
Unit
Default value
Related service mode
COPIER> ADJUST> HV-TR
Set Pre-transfer charge current adj VL
To set the output adjustment value of pre-transfer charging current.
When the toner scattering occurs at the image end side, decrease
the value.
As the value is increased by 1, the current is increased by 5 uA.
• When replacing the DC Controller PCB/clearing RAM data
• When an image failure occurs (leopard patterns on Bk solid image)
Do not use this at the normal service.
-30 to 40
5 uA
0
Sec trns indiv set target currnt: set 1
To adjust the target current of secondary transfer for setting 1.
Setting 1 is the combination condition of environment, paper type
(paper weight), color mode and feed side that are set in TR-ENV1,
TR-PPR1, TR-CLR1 and TR-DUP1. When this condition is satisfied,
the target current that is set here is applied to the Secondary
Transfer Outer Roller.
When low-voltage mottled image or toner scattering on solid image
occurs, increase the current.
When high-voltage mottled image or density loss due to excessive
transfer occurs, decrease the current.
As the value is incremented by 1, the current changes by 2 uA.
+: Increase
-: Decrease
When an image failure occurs on all paper types (mottled image,
density loss due to excessive transfer, toner scattering on solid
image, etc.)
Increase/decrease the value by 1 while checking the symptom each
time.
-10 to 10
2 uA
0
COPIER> ADJUST> HV-TR> TR-ENV1, TR-PPR1, TR-CLR1, TR-
DUP1, 2TR-SHR1