[ICOM] IC735 Users

[Mike Olbrisch]

> -----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

Molon labe. [mo-lone lah-veh] Google it...

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