Yes a picture of the screen would be helpful. One picture is worth a thousand words.
There were three times I recall something similar on an 8900. 

One time the problem was a power resistor behind the CRT. If you remove the 4 screws around the CRT, (with the power to the electronics off), you can slide the CRT unit forward and see the components in the housing. It was one of the large black resistors that was bad. I think you could see cracking in the black substance of the resistor body.
The other time was in the CRT power amp circuit (water cooled at the bottom rear of the console). Can only access with all power off, chiller shut down. Not something you want to do unless you are trained. I believe one or more power amps were bad in the sealed box.

The third time was the CRT HV tank. Once again all power off. I don’t recall what component was bad in the tank.

So unless you slide the CRT out and see an obviously fried resistor, you need to call JEOL for service. I realize that demand service rates are outrageous, but it is likely the only way you will get it working again.

A former JEOL Microprobe Specialist.

Sent by Mr. "T"

> On Jan 3, 2019, at 8:35 AM, William J Mushock <[log in to unmask]> wrote:
> 
> Could you provide a picture or video of what you describe as internal reflections? And, are you convinced this is the result
> of the same issue? Confession: In a former life I was a field service rep for JEOL and had a lot of experience on the 8900s.
> I think it would be a big help to see what you are describing.
> 
> Bill
> 
>> On Thu, Jan 3, 2019 at 10:01 AM Collins, Keith W. <[log in to unmask]> wrote:
>> Unfortunately, It may be time to schedule a service visit from JEOL.
>> 
>>  
>> 
>> From: JEOL-Focused Probe Users List <[log in to unmask]> On Behalf Of Ioannis Baziotis
>> Sent: Thursday, January 3, 2019 3:55 AM
>> To: [log in to unmask]
>> Subject: [EXTERNAL] Re: [PROBEUSERS] Re: [PROBEUSERS] Re: [PROBEUSERS] URGENT HELP: JEOL JXA 8900 Superprobe
>> 
>>  
>> 
>> We have cleaned and reseat all pc boards. Checked all the fuses at the front and back of the control unit but nothing changed. Any other ideas to test?
>> 
>>  
>> 
>> Στις Παρ, 28 Δεκ 2018, 21:30 ο χρήστης Collins, Keith W. <[log in to unmask]> έγραψε:
>> 
>> You can generally visually look at the fuse and see if the wire has burned out (magnifying glass helps) or use a volt ohm meter to test,.  IF the fuse is bad you replace it with the same rated fuse.  Fuses may be located in a block of fuses, on the circuit board or in a fuse holder in a wire (usually a twist to open).   Fuses should be marked on the wiring diagram.   I would suggest a service call.
>> 
>>  
>> 
>> From: JEOL-Focused Probe Users List <[log in to unmask]> On Behalf Of Ioannis Baziotis
>> Sent: Friday, December 28, 2018 10:56 AM
>> To: [log in to unmask]
>> Subject: [EXTERNAL] Re: [PROBEUSERS] Re: [PROBEUSERS] URGENT HELP: JEOL JXA 8900 Superprobe
>> 
>>  
>> 
>> Ok. 
>> 
>> 1) how do you check them?
>> 
>> 2) how do you replace them?
>> 
>>  
>> 
>> Στις Παρ, 28 Δεκ 2018, 20:37 ο χρήστης Collins, Keith W. <[log in to unmask]> έγραψε:
>> 
>> Also check fuses a blown fuse to the scan coils can result in half an image.
>> 
>>  
>> 
>> From: JEOL-Focused Probe Users List <[log in to unmask]> On Behalf Of Ioannis Baziotis
>> Sent: Friday, December 28, 2018 9:22 AM
>> To: [log in to unmask]
>> Subject: [EXTERNAL] Re: [PROBEUSERS] URGENT HELP: JEOL JXA 8900 Superprobe
>> 
>>  
>> 
>> Great...i`ll try it. so, which PC boards you exactly mean? The one seeting at the front part of the control unit, or at the back, too?
>> 
>> ----------------------------------------------------------------
>> Ioannis Baziotis [log in to unmask]
>> Assistant Professor of Mineralogy and Petrology
>> Agricultural University of Athens
>> Laboratory of Mineralogy and Geology
>> Athens, 11855 Greece
>> (+30)210-529-4155
>> Twitter: https://twitter.com/EGU_GMPV
>> Personal site: http://ibaziotis.wix.com/ioannis-baziotis
>> 
>> ----------------------------------------------------------------
>> 
>> Next dream is "on-the-go" .........mid -April 2019
>> 
>>  
>> 
>>  
>> 
>>  
>> 
>> 
>> 
>> Απαλλαγμένο από ιούς. www.avast.com
>> 
>>  
>> 
>> Στις Παρ, 28 Δεκ 2018 στις 5:56 μ.μ., ο/η William J Mushock <[log in to unmask]> έγραψε:
>> 
>> Ioannis,
>> 
>>  
>> 
>> Turn off console power, remove the lower front cover and try re-seating the PC boards. Sounds like you may have developed
>> 
>> a bad contact (oxidation) on the edge connector of one of the boards.
>> 
>>  
>> 
>>  
>> 
>> On Fri, Dec 28, 2018 at 8:25 AM Ioannis Baziotis <[log in to unmask]> wrote:
>> 
>> Dear Colleagues,
>> 
>> I have noticed the following problem on my JEOL JXA-8900 Superprobe. 
>> At the lowest magnification (40X), the 30% of the screen (left part) is black (either under SE or BSE). Please note, that under OM (reflected light) the image looks perfect. Also, at higher mag the horizontal movement (when inspecting a sample) is like having internal reflections. The filament has been replaced very recently, however, i had the same problem still occurring since the last week with the previous filament. Also, at higher mag (from 950X to 1000X and 9500X to 10000X) there is a considerable shift on horizontal axis. I tried the objective lense aperture (X and Y) however, nothing changed. Any idea for the problem and how can i fix it? 
>> 
>> All the best.
>> 
>> ****
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