Sony ICF-SW30 - No AM
 

I know it's old but my ICF-SW30 lost it's AM and I was wondering if
anyone had a suggested fix.

One day I turned it on and got nothing but light static on the AM
band. EVERYTHING else works just fine - clock, alarms, sleep timer,
FM, and all the SW bands.

I took it apart and reseated the few connections there are. I've also
reset it. Right now I have the batteries out and am waiting 3-4 hours
before resetting again (based on another post for a different radio).

Any ideas?

Sony ICF-SW30 - No AM
 

schrieb:

I know it's old but my ICF-SW30 lost it's AM and I was wondering if
anyone had a suggested fix.

One day I turned it on and got nothing but light static on the AM
band. EVERYTHING else works just fine - clock, alarms, sleep timer,
FM, and all the SW bands.

Sounds like something in the MW frontend went belly up. You may be aware
that the rx is single conversion on MW but dual conversion on SW. If
there were weak reception of at least strong locals, I'd suspect a blown
RF amp, but this way I'd guess the mixer is blown, or something less
likely like a disconnected antenna coil or failed tuning voltage
connection (or whatever). Unfortunately I don't have service docs for
this set. Ironically MW is the only band that has decent performance
while not being a pain to tune.

Stephan
--
Home: http://stephan.win31.de/
So if it receives like a handbag, does it sound good at least?

Sony ICF-SW30 - No AM
 

wrote in message
oups.com...
I know it's old but my ICF-SW30 lost it's AM and I was wondering if
anyone had a suggested fix.

One day I turned it on and got nothing but light static on the AM
band. EVERYTHING else works just fine - clock, alarms, sleep timer,
FM, and all the SW bands.

I took it apart and reseated the few connections there are. I've also
reset it. Right now I have the batteries out and am waiting 3-4 hours
before resetting again (based on another post for a different radio).

Any ideas?


Buy a new Sony radio? An SW-35 or better yet an SW-7600GR?
Your SW30 is pretty old. If you don't buy a new Sony now you may not be
able to buy one in the future.

Sony ICF-SW30 - No AM
 

I know that this reply is kinda late (OP was Feb 28), but more recently
I came across an excerpt from the schematic:
http://www.radioscanner.ru/uploader/2006/icfsw30.djvu
As one can see, the MW frontend is quite simple, similar to e.g. the
ICF-7601. Possible causes of no AM but everything else working thus
could be:
* One wire of the antenna coil L16 (or the center tap) has become
disconnected. Should be relatively easy to check.
* No LO output. Use another rx to check for the LO het 450 kHz above
nominally received frequency. If this is not present, it's either a
problem with the LO or the PLL (for which I don't have a schematic).
* Dead MW mixer. This is not unlikely given the sudden appearance of the
problem (which frequently indicates a semiconductor defect) and would
be toughest to fix, requiring replacement of the CX20111 (a 24-pin SOP
part). It looks like this chip was produced at least until 2000 and is
still obtainable.

Stephan
--
Home: http://stephan.win31.de/
viele leute schreiben qualität nur deswegen groß, weil es ein
substantiv ist. [wie wahr...]