An actual radio post - Icom R75 tech problem
 

Hi - if anyone has any experience with an R75, I would appreciate any
ideas you have. The R75 has several filter settings, narrow-normal-
wide. Until Monday night, they all worked perfectly. Suddenly, on
the AM-wide setting, the signal is enormously attenuated - not
inaudible, but virtually all the gain is gone in that setting. In all
other settings the radio works as it should.

Any ideas? Is this a filter problem, a solder problem, other? The
radio has not received any knocks or spikes I know of. It does have
the Kiwa mods, which means the fault occurs in the 6 kHz filter that
replaces the original 15 kHz filter.

Thanks,
Bruce

An actual radio post - Icom R75 tech problem
 

Think Steve has one. He'll pick up soon


--
Burr
From The Gardens
Roses & Orchids
Guiguinto, Bulacan. Philippines
http://www.guiguinto.gov.ph/
And Red Mountain, Ca. USA
I'm a member of The Tea Party, I VOTE
"bpnjensen" wrote in message
...
Hi - if anyone has any experience with an R75, I would appreciate any
ideas you have. The R75 has several filter settings, narrow-normal-
wide. Until Monday night, they all worked perfectly. Suddenly, on
the AM-wide setting, the signal is enormously attenuated - not
inaudible, but virtually all the gain is gone in that setting. In all
other settings the radio works as it should.

Any ideas? Is this a filter problem, a solder problem, other? The
radio has not received any knocks or spikes I know of. It does have
the Kiwa mods, which means the fault occurs in the 6 kHz filter that
replaces the original 15 kHz filter.

Thanks,
Bruce

An actual radio post - Icom R75 tech problem
 

On Apr 21, 12:42*am, bpnjensen wrote:
Hi - if anyone has any experience with an R75, I would appreciate any
ideas you have. *The R75 has several filter settings, narrow-normal-
wide. *Until Monday night, they all worked perfectly. *Suddenly, on
the AM-wide setting, the signal is enormously attenuated - not
inaudible, but virtually all the gain is gone in that setting. *In all
other settings the radio works as it should.

Any ideas? *Is this a filter problem, a solder problem, other? *The
radio has not received any knocks or spikes I know of. *It does have
the Kiwa mods, which means the fault occurs in the 6 kHz filter that
replaces the original 15 kHz filter.

Thanks,
Bruce

If you put a jumper across the filter does the gain come back ?

An actual radio post - Icom R75 tech problem
 

On 4/21/2011 2:25 AM, wrote:
On Apr 21, 12:42 am, wrote:
Hi - if anyone has any experience with an R75, I would appreciate any
ideas you have. The R75 has several filter settings, narrow-normal-
wide. Until Monday night, they all worked perfectly. Suddenly, on
the AM-wide setting, the signal is enormously attenuated - not
inaudible, but virtually all the gain is gone in that setting. In all
other settings the radio works as it should.

Any ideas? Is this a filter problem, a solder problem, other? The
radio has not received any knocks or spikes I know of. It does have
the Kiwa mods, which means the fault occurs in the 6 kHz filter that
replaces the original 15 kHz filter.

Thanks,
Bruce

If you put a jumper across the filter does the gain come back ?



Excellent suggestion for testing. It's also possible that a bad
connection at the plug-in (if it is a plug-in filter) or solder
points will be flushed out merely by unplugging or jumpering the
connections.

You might want to jumper the in and out terminals on the filter with
a .01 mF capacitor instead of a dead short for the test, just in
case there are DC voltages on the terminals.

With all good wishes,


Kevin, WB4AIO.
--
http://nationalvanguard.org/
http://kevinalfredstrom.com/

An actual radio post - Icom R75 tech problem
 

Another possibility:

If the filters are easily switchable from position to position, try
swapping a couple and see if the fault follows the filter or remains
with the circuitry for that selectivity position.

73,


Kevin, WB4AIO.
--
http://nationalvanguard.org/
http://kevinalfredstrom.com/

An actual radio post - Icom R75 tech problem
 

On 04/20/2011 09:42 PM, bpnjensen wrote:
Hi - if anyone has any experience with an R75, I would appreciate any
ideas you have. The R75 has several filter settings, narrow-normal-
wide. Until Monday night, they all worked perfectly. Suddenly, on
the AM-wide setting, the signal is enormously attenuated - not
inaudible, but virtually all the gain is gone in that setting. In all
other settings the radio works as it should.

Any ideas? Is this a filter problem, a solder problem, other? The
radio has not received any knocks or spikes I know of. It does have
the Kiwa mods, which means the fault occurs in the 6 kHz filter that
replaces the original 15 kHz filter.

Thanks,
Bruce

There are a bunch of updates. You need to send the radio to Washington.
They will make it better than new for about $150-$200. There are bad
capacitors inside sealed sub-assemblies; the whole radio gets taken apart.

ICOM America is a small company with nice people. You can get the lead
service tech on the phone no problem. They have a flat rate for the R75
upgrade as I recall.

How to Contact Technical Support

Monday – Friday 7:00 AM to 5:00 PM
Phone: (800) 253-1498 or (425) 450-6087
Email Technical Support Department

http://www.icomamerica.com/en/contac...ContactType=TS

An actual radio post - Icom R75 tech problem
 

On Apr 21, 7:03*am, dave wrote:
On 04/20/2011 09:42 PM, bpnjensen wrote:

Hi - if anyone has any experience with an R75, I would appreciate any
ideas you have. *The R75 has several filter settings, narrow-normal-
wide. *Until Monday night, they all worked perfectly. *Suddenly, on
the AM-wide setting, the signal is enormously attenuated - not
inaudible, but virtually all the gain is gone in that setting. *In all
other settings the radio works as it should.

Any ideas? *Is this a filter problem, a solder problem, other? *The
radio has not received any knocks or spikes I know of. *It does have
the Kiwa mods, which means the fault occurs in the 6 kHz filter that
replaces the original 15 kHz filter.

Thanks,
Bruce

There are a bunch of updates. You need to send the radio to Washington.
They will make it better than new for about $150-$200. There are bad
capacitors inside sealed sub-assemblies; the whole radio gets taken apart..

ICOM America is a small company with nice people. You can get the lead
service tech on the phone no problem. They have a flat rate for the R75
upgrade as I recall.

How to Contact Technical Support

Monday – Friday 7:00 AM to 5:00 PM
Phone: (800) 253-1498 or (425) 450-6087
Email Technical Support Department

http://www.icomamerica.com/en/contac...ContactType=TS

Thanks - I would love to do this - but the thing has Kiwa mods that I
really like, and I don't want IcomAmerica to restore it back to any
"original condition". However, I will try a phone call to see what
they can do for me.

An actual radio post - Icom R75 tech problem
 

On Apr 21, 1:38*am, Kevin Alfred Strom
wrote:
Another possibility:

If the filters are easily switchable from position to position, try
swapping a couple and see if the fault follows the filter or remains
with the circuitry for that selectivity position.

73,

Kevin, WB4AIO.
--http://nationalvanguard.org/http://kevinalfredstrom.com/

Thanks, Guys - these are fine ideas. I checked inside last night; the
filter in question is hard-soldered into the CB; if it were just
inserted, I guess I could have just plopped another similar filter I
have (15 kHz) into place to try it out.

I've also already spoken with Kiwa, and this morning I'll give Icom a
call.

Bruce

An actual radio post - Icom R75 tech problem
 

On 4/21/11 10:00 , bpnjensen wrote:
On Apr 21, 1:38 am, Kevin Alfred
wrote:
Another possibility:

If the filters are easily switchable from position to position, try
swapping a couple and see if the fault follows the filter or remains
with the circuitry for that selectivity position.

73,

Kevin, WB4AIO.
--http://nationalvanguard.org/http://kevinalfredstrom.com/

Thanks, Guys - these are fine ideas. I checked inside last night; the
filter in question is hard-soldered into the CB; if it were just
inserted, I guess I could have just plopped another similar filter I
have (15 kHz) into place to try it out.

I've also already spoken with Kiwa, and this morning I'll give Icom a
call.

Bruce


I've had some interaction with ICOM in Bellevue. They do nice
work, and they're pretty quick, depending on workload. The first
time, there was a miscommunication, apparently, and they didn't to
the second part of the project I sent them. So you need to be very
clear about your symptoms and your expectations.

In my case, they did make it right, however. And the second radio
I sent to them, came back to me looking and operating like new.

I have no hesitation about sending a rig to them now, or in the
future.