[ICOM] Encoder for IC751A - main tuning

[Gary Fiber]

Jim,

The IC-735 memory battery ONLY backs up the 10 memories nothing else.
Worse thing that will happen if the memory battery goes dead in an 
IC-7355 is all the memories will reset to 28.000 MHz

Gary K8IZ

At 07:03 PM 3/5/2008, you wrote:
>Hi Don,
>
>Since you have had a IC-735 for several years, please tell me how often you
>have replaced the memory battery.
>
>I bought my IC-735 used in 1988. I replaced the battery after the first 6-7
>years and have not replaced it since. It is still fully functional, but I
>suspect it should be replaced again. The only concern I have is the
>possibility of it losing its mind, since the programming is in volatile ram.
>I have only had the cover off twice in its lifetime. Once to change the
>battery and once to change the CI-V baud rate to 9600Baud. It has been a
>very reliable work horse. and was my main radio for about 16 years and now
>it is relegated to Motorhome mobile.
>
>* 73's Jim W5IFP *
>
> >  -----Original Message-----
> >  From: icom-bounces at mailman.qth.net
> >  [mailto:icom-bounces at mailman.qth.net]On Behalf Of Donald Sanders
> >  Sent: Thursday, March 06, 2008 12:31 AM
> >  To: ICOM Reflector
> >  Subject: Re: [ICOM] Encoder for IC751A - main tuning
> >
> >
> >  I've had several inquires about this repair to the optical encoder. Below
> >  is a brief description of what I did on the encoder in my IC 735.
> >
> >  Healthfully yours,
> >                            Don W4BWS
> >  ----- Original Message -----
> >  From: "Lee Mairs (SAG)" <lmairs at sagcorp.com>
> >  > I'd be really interested in hearing about this also.
> >  > 73 de Lee  KM4YY/8
> >  > Proud owner of a 751A for over ten years
> >  >
> >  > Bert Almemo wrote:
> >  > > Hi Don,
> >  > >Thanks for reply. Do you have any tips regarding rebuilding you can
> >  share?
> >  > > Thanks.
> >  > >
> >  > > 73 Bert, VE3OBU
> >
> >  I do not know of others having the main tuning dial lockup on their IC735
> >  but it
> >  happened to me after 20 years of use of this fine gear.
> >  With much trepidation I removed the optical encoder by removing a few
> >  screws,
> >  pulling the PC board and forcing the shaft out of its housing. I
> >  burnished
> >  the shaft
> >  and the inside of the housing using fine crocus cloth until I
> >  had a smooth
> >  surface.
> >  I reinserted the shaft to make sure it turned freely.
> >
> >  After freely turning of the shaft, I applied a small amount of white
> >  Lubriplate
> >  lubricant to the shaft and reinstalled in the housing. I reassembled the
> >  encoder
> >  and replaced it in the IC735. To my surprise and pleasure it
> >  works like new.
> >
> >  I have never seen any repair or service notes on this encoder
> >  repair but it
> >  worked
> >  for me. I hope this helps others who may experience this problem.
> >  Don't worry about the small size, I am 67 years young, have
> >  arthritis in my
> >  hands and
> >  knees, only one eye and still had no problem doing this repair
> >  except fear
> >  of lousing
> >  it up. But what to lose, the rig didn't work, except at one
> >  frequency,without the optical
> >  encoder dial working.
> >  BTW, other than replacing the VCO caps, this is the first problem with
> >  either of my
> >  two IC735's. What a great and reliable rig these have been.
> >  What a great operating rig at both QRP and QRO.
> >  Thanks ICOM!
> >  Healthfully yours,
> >                            Don W4BWS
> >
> >
> >
> >
> >  ----
> >  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/
>
>----
>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/
>
>
>--
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>3/4/2008 9:46 PM

Gary Fiber K8IZ
GROL PG-19-6691
Washington State Resident