[Error Code] Toshiba E-Studio 2500C with a C970

[mntech]

Manual Says this:
[C970] High-voltage transformer abnormality
(1) Is the main charger installed securely?
(2) Check if the spring of high-voltage supply contact point is deformed.
(3) Check if the needle electrode is broken or the main charger grid is deformed.
(4) Check if any foreign matter is on the needle electrode or main charger grid.

If you boot the machine, as soon as it starts warming up, it pops the C970...Is there a way how to tell what drum or charge is causing this error code?
I've tried swapping around some charge units, and inspected all the drum/charges and wasnt able to find anything shorting out. Also I did notice the needle electrode on the black drum is worn on its coating, and may be the culprit, but im not sure.

Any help would be appreciated.

[mntech]

I forgot to mention, that i also inspected the springs in the rear of the machine that make contact with the drum units, they seem fine.

[Hansen88]

Sometimes the rear corona blocks break where the electrode attatches on. Sometimes a easy way to tell which ones is to pull out the charger clean rods and the one that has no pressure or makes no sound of going over the needle electrodes is the problem one. Hope this helps

[mntech]

I am not sure what you mean by using the cleaning rod to check pressure or sound?

I took the main charge off the bk drum, and started the machine, after it threw the C970, the black drum had solid black toner on it... wouldn't the bad drum produce the same solid toner coverage if the charge failed?

Can i use a volt-meter or service mode to detect the culprit?

[michaelc]

Following on from what Hansen88 has said. On each of the charger units, where the needle elctrode is attached to eh end block. If you look to the rear block there is a little pip of plastic where the electrode should be attached. Those can sometimes break. If you check them all on each unit. That would be where I would start. Make sure the grids have been put on correctly to. hope that helps

[mntech]

Thanks!
The magenta rear block plastic notch broke holding the electrode. Kinda threw me off, because the customer snapped the black cleaning rod just prior to the error code, so i was almost sure the black was causing the problem. Also I know understand what Hansen was referring to by listening to the noise when the cleaning rod slides across the teeth of the electrode.

Thanks again!

[jamesyboy]

thes machines have lots of end block problems ive removed all the cleaning rods on mine and switched off 808 its made a big difference

[michaelc]

There is a little knack to changing them to. The screw on the rear end block is the key. Before removing the grid and electrode give that screw a half/full turn to loosen it slightly. And tighten back up once the new grid and electrode are fitted. Just takes a little strain off the pip which holds the elecrode when fitting the electrode and stretching the spring for the grid.