How to repair a Laser Whistler DE-1770 Radar Detector

Fault:  Not turning on.

Symptoms:  Consuming current, not blowing fuses.  Two parallel SMT resistors on the underside of the board are looking burnt or very warm.

Fix:  Replace tantalum caps C320 C327 C326 and C340, check the two resistors on the underside of the board, replace if required.  Check for regulated voltage on the 78m09 regulator mounted on the waveguide

Done

   
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