EUD-2016026-00 Rev.2, SmartScanIS User’s Guide for Union Pacific, 14 January 2021
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4.6.3 2058-305 Talker Board
The 2058-305 Talker board transmits voice messages to the train crew. It receives various
commands from processor-A (aka Analyzer Processor) on the Processor board during and
after train passage. Processor-A decides what needs to be announced and sends high-level
commands to the Talker board, which interprets these commands and constructs the
appropriate messages. The Talker board also generates the audio and PTT signals
necessary to control the radio.
The figure below shows a Talker board (2058-305).
4.6.3.1 Firmware Chip (U3)
On the Talker board, the firmware is in a single 27C256 or equivalent EPROM (erasable
programmable read-only memory). If it becomes necessary to replace this chip, see
Chapter 15 – Replacing Chips
.
Firmware Chip (U3)
1st Speech Data Chip (U14)
Potentiometer (R12)
Socket (P1)
Socket (S1)
Firmware Chip (U3)
1st Speech Data Chip (U14)
Potentiometer (R12)
Socket (P1)
Socket (S1)
Summary of Contents for SmartScanIS
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