[Icom] Questions with IC781 and ICR9000

Fri, 31 Jan 2003 10:54:55 -0600

When I had my 781, I cured the heat problem with a $10 ac computer fan
mounted on the rear--made a BIG difference.

Andy  K5VM

----- Original Message -----
From: "Tony Hwang" <[email protected]>
To: <[email protected]>
Sent: Friday, January 31, 2003 10:17 AM
Subject: Re: [Icom] Questions with IC781 and ICR9000

> Hi,
> One thing I can say is to replace all the capacitors on the good power
> supplies B4 they burst too.
> Weakest link in any PSU is electrolytic caps.
> Kong Ha Shin Nyon(Korean new year's greetings)
> 73,
> Tony, VE6CGX
>
> Siu Johnny wrote:
>
> >Dear Group,
> >
> > It is a very long mail.  If you are not interested, you may stop here
and delete the message.
> >One of my colleague is so fond of IC781 and owns 6 of them.  In the past,
I told him that the biggest problem with this rig was overheat in the power
supply unit.  He did not believe me so that eventually two of his rigs got
smoked.  After opened up his defected rigs, I noticed that the electrolytic
capacitors in the power supply unit were all burst and burnt marks were
everywhere.
> >
> >Eventually he believed what I said and ordered a huge step down
transformer to turn domestic 230V AC supply to 200 V to suit his rigs.  Now,
he notices the following and would like to get some advice from you:
> >
> >1.       After using the step down transformers, every time when he
switches on his rigs, the red TX lamp will light up for half of a second and
everything turns normal.
> >
> >2.       Every time when he switches off his rigs, the signal meter will
give a brief full-scale deflection before everything is quiet.
> >
> > He also owns a ICR9000 receiver.  This time he does vary about the power
supply unit and tries to use the step down transformer as well. However,
when he uses the step down transformer to operate his receiver under 200V,
the receiver does not function well but generate a lot of internal birdies.
> >
> >He is now very upset because he has spent a fortune in his collection.
Since his English is not too good, he has asked me to put forward his
questions here.  Could all of you give your explanation to the above
phenomenon.  Thanks a lot.
> >
> >Today is the Chinese New Year eve.  The year of Goat is coming.  Wish you
all a prosperous year of Goat and !�DKung Hei Fat Choy!| !V a Chinese New
Year greeting.
> >
> >
> >
> >73 & TNX
> >
> >
> >
> >Johnny Siu VR2XMC
> >
> >
> >
> >
> >
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> >Your Moderator: Dick Flanagan W6OLD, [email protected]
> >Icom Users Net: Sundays, 1700Z, 14.315 MHz
> >Icom FAQ: http://www.qsl.net/icom/
> >
> >
> >
>
>
> ----
> Your Moderator: Dick Flanagan W6OLD, [email protected]
> Icom Users Net: Sundays, 1700Z, 14.315 MHz
> Icom FAQ: http://www.qsl.net/icom/