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— A B B M E A SU R EM ENT & A N A LY TI C S | S ERV I CE I NS TRUC TI O N
SM500FPaperless recorder
Modification to prevent instrument resetting when inserting the SD card.
1 Introduction
This document describes how to modify the processor board of SM500F instruments manufactured before September 2011 if the instrument resets when an SD card is inserted.
2 Action
Implement when fault reported
Implement at next service
Information only Recall instruments
–SM500F paperless recorder
3 Processor board modification
If your instrument resets when an SD card is inserted, the following modification should resolve the issue. If you have any problems or are not sure about this procedure, please contact Recording & Control Technical Support.
To modify the processor board:1 Remove the processor board as described in Information
Sheet INF08/006-EN.
2 Remove R96 (if fitted):
3 Fit a 47 µH inductor across the pins of D9 and TR1 as shown:
4 Replace C121 with a 10 µF capacitor:
5 Refit the processor board as described in Information Sheet INF08/006-EN.
NOTICE If you cannot replace the components locally, the alternative solution is to replace the processor board.
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