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Message ID: 5703     Entry time: Wed Oct 19 17:21:16 2011
Author: Koji 
Type: Summary 
Category: LSC 
Subject: Modification on the RFPD interface cards 

I have modified all of the three RFPD interface cards to be enabled permanently.
This prevents an accidental disabling caused by a stray voltage of the logic input (or whatever),
which was reported in multiple occasions by Anamaria and me.

The logic ICs (74LS04) for buffering of the EPICS switches were removed by 14pin sockets with additional wires soldered.
The modification shorts the inputs to the second logic chips, resulting in the permanent enabling of the PD circuit.

Attachment 1: D990543-B_mod.pdf  145 kB  | Hide | Hide all
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