[ICOM] Encoder for IC751A - main tuning

[EP Swynar]

Hi Jim,

I don't know how much room you have inside that 735, but the 751A --- with
the OUTBOARD AC power supply --- has lots.

That's why I hot-melted a battery holder for two AAA cells inside, and wired
the thing in parallel with the leads to the memory battery: whenever I
replace the lithium "disk", I always install a couple of fresh penlights
into the holder to ensure the memory won't die on me.

In the 20 years I've owned the rig (got it brand new), I've replaced the
battery twice (translates to a new battery every 8 years, I guess) --- not
because I absolutely / positively HAD to, but because I thought it was cheap
insurance to do so.

~73!~ Eddy VE3CUI - VE3XZ


***********************************


----- Original Message ----- 
From: "Jim Hargrave" <w5ifp at gvtc.com>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Wednesday, March 05, 2008 10:03 PM
Subject: RE: [ICOM] Encoder for IC751A - main tuning


> 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. Bel
ow
> >  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/