Increase the toner mass amount.
Increase the value in SP3-620-202 and SP3-620-203 by one step at a time until vertical streaks are eliminated. (Do not increase too high.)
Execute SP3-011-002 (Manual ProCon: Exe: Density Adjustment).
Execute the toner refresh with the following SP modes.
SP3-062-001 (Manual Tnr Ref:Exe : KCMY)
SP3-062-002 (Manual Tnr Ref:Exe : CMY)
SP3-062-003 (Manual Tnr Ref:Exe : K)
SP3-062-004 (Manual Tnr Ref:Exe : C)
SP3-062-005 (Manual Tnr Ref:Exe : M)
SP3-062-006 (Manual Tnr Ref:Exe : Y)
SP3-062-007 (Manual Tnr Ref:Exe : S)