[Icom] Questions with IC781 and ICR9000

[Tony Hwang]

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 ��Kung Hei Fat Choy�� �V a Chinese New Year greeting.
>
> 
>
>73 & TNX
>
> 
>
>Johnny Siu VR2XMC
>
> 
>
>
>
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