Grundig Satellit 700 World Receiver. AM bands are dead
I have Grundig Satellit 700 World Receiver.
It works very well on FM. But not on AM. Completely dead.
I have tried putting the receiver in my freezer and put on the power. Batteries charge better at low temperature. And it worked...But only for a few hours.
Perhaps the problem is the built-in rechargeable lithium battery? I have opened the radio, but where is the battery situated?
Can anybody help?
Regards
Henrik
It works very well on FM. But not on AM. Completely dead.
I have tried putting the receiver in my freezer and put on the power. Batteries charge better at low temperature. And it worked...But only for a few hours.
Perhaps the problem is the built-in rechargeable lithium battery? I have opened the radio, but where is the battery situated?
Can anybody help?
Regards
Henrik
Audio Players & Recorders - Grundig
Answers & Comments
Ist Local Oscillator (PLL) stops working. It's desiged with bare minimum feedback to keep it's output reasonably clean. Removing (De-soldering) the screening box reduces losses, but it's still marginal. Something in the osc. circuit is temperature sensitive, so squirting it with freezer spray - or putting the set in the 'frig will get it going again. Have one like this, "Repaired" - been going for about 5 years and just quit again! If I get any better luck next time, I'll re-post this!
I have the same problem with my GS700 for about a month. Dead on AM, but workes fine on FM.
Sometime works OK on AM for a few seconds after switching rig ON.
I have not found the problem yet. Will be nice to have a block-diagram of the rig.
ZS2VJ "Val"