konica 7033 error 28-1

[mdm7266]

Hello there! can somebody help me with my problem on konica 7033.
when i turn on the power as soon it is ready to copy, error code 28-1 appears.
for all i know it is a problem on HV1 (Charging) or HV1 board.
the problem is intermittent. could this be a problem on charge terminal blocks?
What might be the solution or remedy to this problem? do i need to reset some programs?

[pepper38_cnd]

It is most likely the charge blocks as you already suspect, but make sure the grid springs are not stretched allowing the grid to sag and occasionally hit the drum. Also if the grid springs are the original type make that the hook points away from the drum ( into the charge assy).

[kmcopytech]

Block charge leakage!!!

You will be able to deal with the insulation.

[ni311]

Warning code
F28-1
Causes
When charging output is judged to be abnormal discharge.
Operation in case of warning occurrence
The main body is stopped immediately if it is in process of copying, main relay is turned OFF, and all keys are not accepted.
Releasing method
OFF of main switch ON Remove jammed paper, if any.
Estimated abnormal parts
Charging corona unit HV1 (High voltage unit 1)
Transfer unit HV2 (High voltage unit 2)
Separation unit HV2 (High voltage unit 2)