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RE: Unity 4000 Problem
To: "'CRTech'" <crtech@crtech.org>
Subject: RE: Unity 4000 Problem
From: "Bill Hurne" <billhurne@pilgrimradio.com>
Date: Mon, 21 May 2018 10:23:36 -0700
Content-language: en-us
In-reply-to: <CAHL64sE6_m_iEC7njpF-vjdo5Lfk1r5H9-D+c68TJSXLdNnzRQ@mail.gmail.com>
References: <CAHL64sE6_m_iEC7njpF-vjdo5Lfk1r5H9-D+c68TJSXLdNnzRQ@mail.gmail.com>
Thread-index: AQGA4qxXbC4r7x7FmCiFofEqHsCaUaTgilzQ

I haven’t had one chatter, but did have one fail that was fixed by replacing a bad cap on the power supply board.   Those units are getting old enough to have caps go bad.   The cap I replaced was the largest one, 150 ufd, 400 VDC.   The bad cap was physically bulging, easy to identify without a cap tester.




From: Kevin Kidd [mailto:kkbroadcastengineering@gmail.com]
Sent: Monday, May 21, 2018 8:11 AM
To: CRTech
Subject: [CRTech] Unity 4000 Problem


Hi all,


One of my oldest customers, engineer and friend has a Unity 4000 rx that started doing odd things a couple of weeks ago.  I haven't had time to get to his site and may not for another week or two.


It started dropping audio intermittently, with a wildly fluctuating EB and then more than intermittently and now just sits and to use his term, "chatters".  He originally checked the LNB, cable, etc, etc but nothing seemed to cure the increasing drop outs.  Now it appears to be mostly dead and I assume that the "chattering" sound that he is hearing is one or more relays closing.


Anybody ever saw a power supply in the 4000 cause something like this?  Is the PS replaceable?  Any idea on a part #?


If not a PS, then what?





Kevin C. Kidd, CSRE/AMD
Lawrenceburg, TN
AM Ground Systems Company  -  WD4RAT
kkidd@kkbc.com  --  866-22-RADIO -- 866-227-2346

Follow-Ups: Re: Unity 4000 Problem
(Kevin Kidd <kkbroadcastengineering@gmail.com>, 21 May 2018 18:30:45 -0000)
References: Unity 4000 Problem
(Kevin Kidd <kkbroadcastengineering@gmail.com>, 21 May 2018 15:11:28 -0000)
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