[ICOM] Raspy CW note on IC751A

[Adam Farson]

Hi Tom,

Here are the ceramic trimmer part numbers: 

6 pF: CV05A0601 (C97, C107 on PLL Unit)

12 pF: CV05A1201 (C78, C88 on PLL Unit)

You can do the job yourself. You will need to unsolder the top cover of the
HPL VCO box (with the 4 holes) an the bottom shield on the solder side of
the board. Be careful not to overheat the paper-phenolic PCB, or it will
de-laminate.

Realignment requires only a DMM or oscilloscope. All the required
information is in the service manual.

If you suspect that the front end may have suffered lightning damage, I
would recommend having the radio repaired by an authorised Icom service
centre.

Cheers for now, 73,
Adam VA7OJ/AB4OJ


-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of Tom Weigel
Sent: Tuesday, June 12, 2007 04:47
To: ICOM Reflector
Subject: Re: [ICOM] Raspy CW note on IC751A

Greetings, Adam:

I have a pristine IC-751A that probably needs new trimmers.  I am quite good
at replacing parts and working on rigs.  Is this replacement something I
could tackle, do you think?  Is there an informational somewhere that lists
the part numbers of the replacement trimmers, do I need sophisticated test
gear to adjust?  Or should I just go ahead and ask Malcom to do the job? 
Also, suspect the diodes may need to be replaced, due to very close
proximity of lightning a year ago when the rig was on, which may have
reduced receive sensitivity.

Hope all's well,
Tom Weigel, ABØJ
Minneapolis, MN




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