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500 series portable echo sounders
M aintenanceaids
There are two rows of test points on the board , P5 and P7.
Check
Information
point
AI. Timer
control.
AD. Timer control.
CS/WR Timer control
TX trigger (active high)
Spare
Test (test = high)
Single/split (single = low)
BW (wide = low)
+5V
13-
GND
2xfrequency
TX pulse
Sample clock
Check
Information
point
Not used
FIFO half full signal
FIFO reset (active = low)
Signature transducer bits
(4)
P3405E/B
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