Electrical problem Sm74-8p 2007

Hi to all
I have sm74-8p 2007
In 9 moth ago I lose this bords

Ltk 500-2 only for ink roller
Hak2 at slot 6&7 for ink-roller 5 to 8 and perfect motor
Eak on slot 6 only for towe3 — 6 boards !!!!
Msk3 2 boards

 

I checked and changed white similar parts
Power supply
Rgp REk2
Aiob
Rek1
Encoder
BLT
But problem still exist

 

It's quite strange, give more details about the problem and how it happened?

 

I check the voltage between ground and negative in
In first test the voltage swing between 24 to 5 v dc
after 1 month I checked again
The results is wonderful !
The voltage swing between 47 to 33 v dc !!!!

 

Hi sir:

I did read your post.

However i can Not understand very well, what is the exactly problem??

Since that you mention :

a) I have sm74-8p 2007, In 9 moth ago I lose this bord , which one??

b)I check the voltage between ground and negative in, In first test the voltage swing between 24 to 5 v dc
after 1 month I checked again The results is wonderful !The voltage swing between 47 to 33 v dc !!!! ??

In short if you explain me carefully, I can Help you.

 

How does your earth leakage device look like? Do you have an earth leakage error on the press?

 

Some times show error F60
In 2 month ago I didn’t seen this error