[Icom] Questions with IC781 and ICR9000

[Siu Johnny]

Dear Group,

 It is a very long mail.  If you are not interested, you may stop here =
and delete the message.=20
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.=20

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.=20

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. =20

Today is the Chinese New Year eve.  The year of Goat is coming.  Wish =
you all a prosperous year of Goat and =A1=A5Kung Hei Fat Choy=A1=A6 =A1V =
a Chinese New Year greeting.

=20

73 & TNX

=20

Johnny Siu VR2XMC

=20



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