[Premium-Rx] WJ 8718 DOA

[Karl-Arne Markström]

It is quite likely that your problem is in one or more of the power 
supplies.
There may be a dried-up or short-circuited electrolytic capacitor.

Also, the WJ receivers have a reputation of problems with drop 
tantalum capacitors that
sometimes go into short circuit. This can also give symptoms from the 
power supplies.
After transportation or long storage this may occur at the first turn-
on.

My advice is to first remove all cards from the mainframe and check 
the voltages and ripple levels at the
power supply outputs. If they are within specification, plug in one 
card at a time and check if the current limiting
is activated or the voltage drops. The last card plugged in should be 
suspected.

73/

Karl-Arne
SM0AOM



----Ursprungligt meddelande----
Från: w2it at rochester.rr.com
Datum: 2012-06-06 06:31
Till: <premium-rx at mailman.qth.net>
Ärende: [Premium-Rx] WJ 8718 DOA



Hello,

I am new to this group and I am already enjoying the archives. I 
collect US and Russian communications equipment as well as WWII vintage 
gear.

I have a rather frustrating problem. I bought one of the 8718s from an 
EBay supplier in China. When the radio arrived it was DOA. All that 
happens is a loud hum form the line out terminals and the decimal point 
of the display lights. No digits light.  I have made sure that all 
cards are seated and even cleaned the card edges. Of course I have 
never used this receiver so perhaps the jokes on me but I am not 
looking forward to returning this. I do need to say that the seller has 
been cooperative and in no way do I think that he purposely shipped me 
a dog. But again, if I can solve this problem I am avoiding a lot of 
shipping fees.

Any suggestions would be greatly appreciated.


Roy Wildermuth
w2it at rochester.rr.com



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