Beginning October 2007, the included AC power supply for the 7-Series recorders was revised to an improved, in-line, grounded supply. The new power supply, like the original power supply, is designed for worldwide operation, accepting 100-240 VAC at 50/60 Hz. Unlike the original supply, this new supply uses a detachable power cord.
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This article was written in reference to the 302, but the concept of polarity reversal applies to all Sound Devices products which provide polarity reversal on certain channels.

Q: What does the polarity switch on a 302 do? Sometimes when I switch it I lose signal on channel 2. What is going on?

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When using the 702T or 744T AES/EBU digital inputs and the built in time code generator to slave the recorders from a mixer with digital outputs, care must be taken. The 702T and 744T internal time code generator can only run off of its internal high-accuracy crystal - it does not use word clock or AES/EBU to derive time code.

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