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Thermo Fisher Scientific

Communication error ( SPI Bus )


Communication error ( SPI Bus )


Titan Cubed 80-300


These are possible resolutions for the issue:

  • Replaced DPA


These are possible causes for the issue:

  • Defective DPA


Customer loaded different FEG register and there was no beam.
There was SPI bus communication error in User Interface. Ref and Readbacks in Mono outputs were fluctuating.

Followed Doc. 106534 Monochromator Electronics Troubleshooting FEG G1 TS, Replaced CPB2 -1051379 , SDC2- 1051365. Didn’t help.
Readbacks on Mono still fluctuating & SPI bus error still appears with mono normalization.

Replaced DPA2 – 1051377 and mono refs and readbacks stopped fluctuating.

Did following measurements and check voltages with HT probe on Mono gold contacts: ( CH. 7 Doc 106534 )
Y Deflection and Y Stig check, Main Deflection and X stig check, Icoil current check
All measured values matched with set values for mono electronics.

Solution : Replace DPA board