[ICOM] IC735 Users

[D C *Mac* Macdonald]

The IC-735 is definitely one of the radios
that had/have the problem with the variable
capacitors in the PLL system!

73 - Mac, K2GKK/5
Oklahoma City,OK




> From: mike-2007 at elp.rr.com 
> To: icom at mailman.qth.net 
> Subject: RE: [ICOM] IC735 Users 
> Date: Tue, 10 Jun 2008 04:58:31 -0600 
> 
> 
>> -----Original Message----- 
>> From: icom-bounces at mailman.qth.net 
>> [mailto:icom-bounces at mailman.qth.net] On Behalf Of Dave Shirk 
>> Sent: Tuesday, June 10, 2008 12:11 AM 
>> To: ICOM Reflector 
>> Subject: [ICOM] IC735 Users 
>> 
>> Hello folks, 
>> 
>> I still have some issues that I would like to address. I will 
>> list them as separate items below: 
>> 
>> 1 - The readout frequency is about 110Hz too high. Will a 
>> simple adjustment of the 1st local oscillator take care of 
>> this, or is it more complex? 
> 
> I would go through the PLL alignment. IIRC - it isn't hard to do. I do not 
> remember if the 735 had the CAP PROBLEM in the PLL. Find out, and since you are 
> in it for alignment - replace the caps - IF THE 735 is one of the affected 
> units. I sold my service manual with my 735 - and I don't remember anymore. 
> 
>> 2 - The receiver seems very sensitive to overload. It has 
>> been so long since I have used this rig, I do not know if it 
>> is the normal behavior for the 735. It seems once a signal 
>> gets over S9, the signal starts to distort. Any comments? 
> 
> The noise blanker was a big problem there - is the noise blanker on? Try it 
> off. Try it with the pre-amp off too. 
> 
>> 3 - It looks like I am getting close to tuner encoder 
>> problems. It basically works well, but sometimes acts odd. 
>> Could this be a cleaning issue? 
> 
> Try gently blowing it out with a can of compressed air. If that don't get it, 
> try using a Q-tip dipped in alcohol to gently wipe the LEDs and photo-resistors. 
> If that doesn't work, send it to Scott Malcolm. CAUTION - those encoders are 
> UNOBTAINIUM! Don't screw it up - or your rig becomes a computer-controlled 
> radio. Other choice is to buy a dead radio to gut the encoder from. But if 
> cleaning don't get it, E-mail Scott Malcolm for help. mailto:mts at trip.net. 
> 
> Good luck. 
> 
> 
> Mike - KD9KC. 
> El Paso, Tx. 
> DM61rt