4QD controllers Service section and technical information
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Date Codes on 4QD controllers

All 4QD controllers have either a serial number or a manufacturing date code written on the printed circuit board. The serial number or date code should always be quoted when asking about a controller: it helps us know what issue the controller is: controllers are modified and improved from time to time.

Serial numbers

Date codes

Other controllers are date coded. This date code is two digits and a letter. The two digits are the year, so 09 is 2008. The letter is the month as in the list below

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