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

[gandalfg8 at aol.com]

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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