[ICOM] Encoder for IC751A - main tuning

[Jim Hargrave]

Hi Eddy,

Thanks for the idea. That sounds like  a prudent thing to do. I'll open it
up some day and see what I can come up with.

* 73's Jim W5IFP *

>  -----Original Message-----
>  From: icom-bounces at mailman.qth.net
>  [mailto:icom-bounces at mailman.qth.net]On Behalf Of EP Swynar
>  Sent: Thursday, March 06, 2008 3:47 AM
>  To: ICOM Reflector
>  Subject: Re: [ICOM] Encoder for IC751A - main tuning
>
>
>  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