[ICOM] Encoder for IC751A - main tuning

[Jim Hargrave]

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
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