[Test-Equipment] Need help repairing IFR1600- from Korea

[Yongsurk Lee, HL1FB]

Thank you for the information. It will be quite helpful.

2018년 11월 23일 (금) 오후 5:20, Nigel Clarke via Test-Equipment <
test-equipment at mailman.qth.net>님이 작성:

> Sorry, I can't offer any direct assistance, but if you haven't already
> seen it there's some information here...
> http://www.repeater-builder.com/test-equipment/aeroflex/aeroflex-index.html
>
> and you could also ask at the Yahoo Marconi Instruments group.....
> marconi_test_instruments at yahoogroups.com
> Nigel, GM8PZR
>
>
>
>
>
> -----Original Message-----
> From: Yongsurk Lee, HL1FB <yonglee at yonsei.ac.kr>
> To: test-equipment <test-equipment at mailman.qth.net>
> Sent: Fri, 23 Nov 2018 2:05
> Subject: [Test-Equipment] Need help repairing IFR1600- from Korea
>
> Hello;
>     I am repairing an IFR1600 made in 1995.
> I bought used and have been using it for the last 15 years with no problem.
> Recently it suddenly stopped functioning with some burning smell.
> I guessed it must be power supply problem, probably caused by shorted
> tantalium capacitor somewhere in one of the board. I saw similar problems
> while repairing ham and test equipments.
> I found the IFR1600 power supply's +15VDC line is shorted at the power
> supply side(only 6 ohms to chassis). And +15VDC input pin(pin 5A,B) of the
> Receiver module showed only 28 ohms.
> Is this 28 ohm normal? I have a maintenance manual with block diagram, no
> schematics.
>
> Could someone answer?
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