[ICOM] ICOM repair?

[Gary P. Fiber]

I see what you are referring to. Its certainly possible as I do not 
remember an isolation diode in series with the lithium battery supply to 
the CPU.

Gary K8IZ

On 1/11/2011 12:44 PM, Stephen Budensiek wrote:
> Gary,
>     Understood.   I have had a couple Icom radio's that had a Lithium
> backup battery go bad, and go into a partial short mode, pulling the
> voltage suppy down to the CPU.  Radio did all kinds of stupid stuff.
> Soon as I pulled the bad battery out, the radio worked OK because the
> CPU voltage went back up to normal.  Replaced the Lithium battery so I
> would loose the memories everytime the battery was changed.
>
> 73's de Stephen, K0SD in TX
>
> **************************************
>
> On Tue, Jan 11, 2011 at 2:45 PM, Gary P. Fiber<gfiber at comcast.net>  wrote:
>> The Operating parameters in the IC-32AT is not backed up by the internal
>> lithium battery, Icom used a mask programmed CPU chip in those days.
>> That battery was only used for retaining the memory channels the
>> operator programmed.
>> I would more likely suspect a voltage regulator, high resistance power
>> switch etc gone bad.
>>
>> As you mentioned the Radios that had the internal battery backed ram
>> were the Amateur Radio products
>> IC : 745, 751, 751A, 761A, R71A, 271 A/H, 471 A/H, 1271A, and Marine SSB
>> Transceivers M700, and M700TY.
>> I don't remember any others using that method of operating parameter
>> retention.
>>
>> Gary K8IZ
>>
>> On 1/11/2011 11:55 AM, Stephen Budensiek wrote:
>>> Hello,
>>>      I'm thinking the IC-32 has a lithium type backup battery.   I've
>>> seen an old one partially short out on some of the other Icom radios,
>>> so the battery pack couldn't keep it up either.   The radio would do
>>> all kinds of stupid things with it microprocessor running at partial
>>> voltage.   There was also a  generation of IC radio's that stored the
>>> OS in volitile memory (IC271, IC471, IC1271, one of the Rxxxx
>>> receivers maybe R4000?, also I believe the IC751), if the battery and
>>> backup battery ran down, the radio was stupid until the OS was
>>> reloaded (not easy if you're not a tech, can't load ram or proms - you
>>> had to replace the lithium battery, then reload the OS, or send it to
>>> Icom for reprogram).
>>>
>>> 73's de Stephen, K0SD in TX
>>>
>>> *********************************************
>>>
>>>
>>>
>>> On Tue, Jan 11, 2011 at 1:08 PM, C.Whitaker<whitaker at pa.net>    wrote:
>>>> de WB2CPN
>>>> My IC-32AT went insane yesterday.
>>>> It was laying on the table, turned OFF, and during
>>>> the night it turned itself ON and ran the battery down.
>>>> A new battery makes the radio do all kind of weird
>>>> things, jumping from one screen to another.
>>>> I'll go down the list and see if anyone will repair it.
>>>> I know it's old.  But I like it, and have a few extra
>>>> batteries here, so I'm not in a mood to trash can it.
>>>> Any one have any better ideas?
>>>> The T70A is nice, but I can't handle the fonts ICOM
>>>> used on the screen.  A "T" shouldn't look like an "L".
>>>> 73  Clete
>>>>
>>>>
>>>>
>>>> ----
>>>> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
>>>> Icom Users Net: Sundays, 1700Z, 14.316 MHz
>>>> Icom FAQ: http://www.qsl.net/icom/
>>>> To support QSL/QTH.net: http://www.qsl.net/donate.html
>>>>
>>> ----
>>> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
>>> Icom Users Net: Sundays, 1700Z, 14.316 MHz
>>> Icom FAQ: http://www.qsl.net/icom/
>>> To support QSL/QTH.net: http://www.qsl.net/donate.html
>>>
>>
>> --
>> Gary P. Fiber K8IZ
>>
>> General Radio Telephone Operators License PG-19-6691,
>> with Shipboard Radar Endorsement.
>> Washington State Resident.
>>
>> Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient (s) and may contain confidential and privileged information.
>> Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message.
>>
>>
>> ----
>> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
>> Icom Users Net: Sundays, 1700Z, 14.316 MHz
>> Icom FAQ: http://www.qsl.net/icom/
>> To support QSL/QTH.net: http://www.qsl.net/donate.html
>>
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> To support QSL/QTH.net: http://www.qsl.net/donate.html
>


-- 
Gary P. Fiber K8IZ

General Radio Telephone Operators License PG-19-6691,
with Shipboard Radar Endorsement.
Washington State Resident.

Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient (s) and may contain confidential and privileged information.
Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message.