🚀 go-pugleaf

RetroBBS NetNews Server

Inspired by RockSolid Light RIP Retro Guy

Article View: comp.sys.mac
Article #12244

Re: Shiva 9600 v.32 NetModem needs fixed! Help!

#12244
From: NATHAN WHEAT
Date: Fri, 28 Aug 1992 03:26
30 lines
2123 bytes
Dwight,

>After the NetModem is turned on the three lights flash as normal until
>it is warmed up.  It shows up on the Network, will connect and AT command
>works correctly.  Then in about 4 minutes the power cycles, the connection
>is lost, the lights start blinking again, etc.
>
>After another 4 minutes or so the lights go out and don't return, the 
>connection is lost.  I checked to 7805 chip inside.  It maintains 25VDC
>input and 5VDC output even after the modem dies.  It is really hot though.
>

If seems to me that there nothing really irreversably worng with it.  It 
seems that it is overheating, which stuffs up the regulator and way cut 
power to itself for a while or stop working, stuffing up the input to the 
chips.  I'm not sure, but this type of thing happened to me too, it turned 
out that by connecting some sort of heat sink (anything which takes away 
heat) to the component getting hot, helps.  This doesn't SOLVE the problem 
as such, but may provide a way around it.  In my case, I connected it to the 
case (metal) so that was fine, if you can't do this, you may wish to look 
into buying a little heat sink for it, the ones with the cooling fins, if 
you have enough room in the case that is!

The real problem is that the regulator or whatever it is, is having to 
decrease the voltage too much, in which case your power supply might be 
giving out oo much voltage, you could look into that too...

Just some suggestions.

Nathan.
Technical Details
Message-ID: <11437294.72.714972408@eng2.eng.monash.edu.au>
Path: arc1-ca.pugleaf.net!sparky!uunet!munnari.oz.au!bruce.cs.monash.edu.au!monu6!ctl-g10-08.cc.monash.edu.au!11437294
References: <1992Aug27.222807.13917@sequent.com>

Show Full Headers
Complete Article Headers
Newsgroups: comp.sys.mac,comp.sys.mac.comm,comp.sys.mac.hardware
Path: arc1-ca.pugleaf.net!sparky!uunet!munnari.oz.au!bruce.cs.monash.edu.au!monu6!ctl-g10-08.cc.monash.edu.au!11437294
From: 11437294@eng2.eng.monash.edu.au (NATHAN WHEAT)
Subject: Re: Shiva 9600 v.32 NetModem needs fixed! Help!
Message-ID: <11437294.72.714972408@eng2.eng.monash.edu.au>
Summary: I need info on fixing a NetModem
Keywords: Shiva Netmodem v.32 repair
Lines: 30
Sender: news@monu6.cc.monash.edu.au (Usenet system)
Organization: Faculty of Engineering, Monash University 
References: <1992Aug27.222807.13917@sequent.com>
Date: Fri, 28 Aug 1992 03:26:48 GMT