[ICOM] IC 765 Tuner Issue

[Nathan Moreschi]

Thanks Gary -

I went through that exact procedure this morning, but no luck.

Thanks again for helping.

73,

Nate/N4YDU
----- Original Message ----- 
From: "Gary Fiber" <gfiber at comcast.net>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Wednesday, November 11, 2009 2:26 PM
Subject: Re: [ICOM] IC 765 Tuner Issue


> Nate,
>
> This was written by the tech who used to do most of the IC-765 work
> when he and I worked at Icom America. This is from the Icom America
> web page Knowledge Base under model 765.
>
>
> Knowledge Base Article 5BBA692A36
>
> Issue
> The tuner on my 765 does not tune on any band. Inspection reveals
> that only one motor is turning.
>
> Resolution
> The motor gear assembly is jammed at one end of its tuning range.
> This failure is usually caused by an attempt to tune an excessively
> high-SWR load.
>
> To fix:
> Disconnect J6 connector on tuner unit and momentarily apply a DC
> voltage (around 15 volts) to the stuck motor to un-jam it. Reverse
> the polarity of the voltage to the motor if it doesn't unstick the
> first time. Reconnect J6 connector and test the tuner. It should now
> work fine. If it does not, the motor driver chip (IC2) has probably 
> failed.
>
> Gary K8IZ
>
>
>
> At 06:09 PM 11/9/2009, you wrote:
>>I believe a servo motor in my IC 765 is jammed. I read a procedure
>>in which a voltage of 15 volts can be applied to the motor to un-jam
>>it. Does anyone have experience with this?
>>
>>The procedure mentioned seemed to be lacking details. It said to
>>remove jumper J6 from the tuner board and apply 15 volts to the
>>motor. Do I apply it directly to the motor or are the leads to the
>>motor on the jumper?
>>
>>
>>Is there another alternative?
>>
>>
>>73,
>>
>>Nate/N4YDU
>>----
>>Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
>>Icom Users Net: Sundays, 1700Z, 14.316 MHz
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>
> Gary Fiber K8IZ
> GROL PG-19-6691
> Washington State Resident
>
> ----
> 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/
> To support QSL/QTH.net: http://www.qsl.net/donate.html