Toshiba ошибка c970

1. 08-28-2017

   
   

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   Toshiba E Studio 4520c C970
   

   Hi, I am attempting to get an E Studio 4520c printing again, however cannot seem to find the cause.

   Apologies, this is my first time attempting to fix a printer like this and am still quite naive, but eager learn

   Background:

   • It has done 800,000 pages, purchased from a sport centre.
   • Demonstrated working colour, however had streaks. (Black printed perfectly).
   • Colour stopped working after transport, probably was the magenta electrode grid broken end block as pointed out here: eStudio 3500c Error Code C970
     • Colleague did not know this at the time, somehow managed to disabled colour printing and get black to print (this all we needed at the time).
     • If someone printed in colour, would spit c970 and would need to reset the printer to get it printing in black and white.
     • The broken block end was «fixed» using a macgyver approach using a nail and a drill? Would this be a problem?

   [C970] High-voltage transformer abnormality
   (1) Is the main charger installed securely?
   All of these appear to be latched on correctly, have used a voltage meter to ensure that corona grid and need electrode are not shorting in any developer unit.

   (2) Check if the spring of high-voltage supply contact point is deformed.
   Not quite sure what it means by this, assuming its the connections in Figure 1 (see bellow).
   Have attempted to bend the contact points up to ensure they are getting connected.

   (3) Check if the needle electrode is broken or the main charger grid is deformed.
   Not broken an any of the developer units, minus the magenta broken end block that was «fixed» using a nail and drill. Probably need to order a new one.

   (4) Check if any foreign matter is on the needle electrode or main charger grid.

   • We tried cleaning them with alcohol, however not sure how to do this property?
     
   • There is one minor minor scuff on one of the Corona grids.

   Figure 1: HVT Connections to Developer Unit:
   IMG_20170828_112059.jpg

   Debugging:

   1. Hold down 0 + 5, type in 201, 202, 203, 204 and click start, each time results in C970
      • Take out developer units, and test one at a time using the above, still results in C970
      • Take out main charger, still results in C970
      • Is this the correct way of individually testing each develop unit?

   2. Test contact points of main charger, does not appear to be shorting out.
   3. Force start (0 + 6) spits a C970

   Questions:

   1. Are there any other ways to determine the root cause and or narrow it down? Or which develop unit is causing the issue.
   2. How would one determine if the high voltage transformer is broken?
   3. How sensitive is the main charger grid?

   Any help would be appreciated

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Toshiba E-Studio machines do not display service code automatically. To read a code you should press down the “8” key and the “Clear/Stop” key at the same time. All codes, except fuser errors are reset by turning the machine off and back on again. PM cycle counter can be set in 0,8 mode, turn on the machine while holding down “0” and 8” keys, enter 251 to set PM limit, and 252 to see the number of copies that have been run since the last PM.

Toshiba Error Codes:

To clear fuser errors, turn on power while holding down “0” and “8”. Enter 400, Press Start. Change status to “0”. Press Enter or “Interrupt”. Shut power and turn back On

Printer Error Codes:

The most common error codes.