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   sci.electronics.repair      Fixing electronic equipment      124,944 messages   

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   Message 123,474 of 124,944   
   legg to All   
   Sangean Emerson ATS803 intermittent tuni   
   16 Feb 23 12:32:44   
   
   From: legg@nospam.magma.ca   
      
   I've got an Emerson ( ~ Sangean) ATS803 that has started to mistune.   
      
   Example:   
      
   Basic commercial FM band tune in 99.1MHz and get intermittent   
   shift in recieved signal as high as 99.9, with no alteration   
   in displayed frequency (reads 99.1).   
      
   This gradually worsens (by frequency pull) until the 99.9MHz   
   signal is continuous. To get 99.1MHz signal out then I have to   
   tune displayed frequency to ~ 98.4MHz. This is just a notable   
   example - smaller shifts have been seen (AIR). I've had to   
   retune the display downwards in increments to keep the 99.1MHz   
   reception.   
      
   It is physically dependent on something. With the case open,   
   pressure on front display can induce it, though all ribbon   
   cables have a fibre insulator installed to prevent pentration   
   of sharp component leads.   
      
   With RF board lifted, there seems no predictable or repeated   
   movement of anything simple that can induce it, but movements   
   of the entire rf board will: This can occur with RF board close   
   or distant. No assembly pressure on cables is required.   
      
   Tapping/wiggling cables and connectors doesn't aggravate or   
   repair it. Tapping/rotating the digital tuning assembly doesn't   
   affect the intermitency.   
      
   Finger placement/force on RF board doesn't change anything.   
      
   It's sitting on the bench open and behaving, but I can induce   
   problem with mech RF board movement or by reassembly at any time.   
      
   Ack.   
      
   RL   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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