[Premium-Rx] Eddystone 1650-3 , with text

[Peter Ratuschni]

Sorry, it seems gmx took a wrong format for the mail-body. So here is my message:


Hello all,
 
I try to repair an Eddystone 1650-3. It has the SSB-display.
The trouble was first that it first showed nothing usefull and did not react to the power button. The owner then replaced the leaked battery. The acid had derogated the cpu-board, even some of the ceramic capacitors lost parts of their housing. The solder points were extremely hard to solder again... Measuring conductance of the circuit pathes requires to push the tips very hard into the old solder, to get any response.
Now I replaced the bad ceramics and the tantals on the cpu-board and all of the Philips 035 series electrolytics of the front assembly. As expected, the most were bad - the capacity losses were between 30 and 80 percent.
Now, the receiver does still almost *nothing* - there is no reaction of the power button and no sound; only some LEDs of the SSB-display are showing activity.
 
I measured the voltage on the cpu-board behind the 7805, it is 4.88V. The next idea is to check if there is any activity at the cpu and then the to have a look at the little regulator on the display board, but I am a bit discouraged, because it is difficult to access all the parts. I do have the sm of the 1650-7 but it seems to be not very helpfull.
 
If anybody has further ideas, that would be great.
 
Best regards,
Peter
 
ps: I am away for some days, so my answer can be delayed.