The 9112i is the only Aastra phone that is not PoE and is powered by a
9v DC voltage, where all other phone when using a AC-DC adapter accept
48v. What probably happened is that someone plugged a 48v adapter in
that 9112i.
The wire will work, but don't power that phone with a 48v adapter or
else the wire will not melt, but will rather send 48v to a circuit
that is designed to work with 9v...
---
Andre Courchesne - Consultant
http://www.net-forces.com
MSN: [email protected]
Skype: VoipForces
L'information contenue dans le présent document est la propriété de
Andre Courchesne. Et est divulguée en toute confidentialité. Cette
information ne doit pas être utilisée, divulguée à d'autres personnes
ou reproduite sans le consentement écrit explicite de Andre Courchesne.
The information contained in this document is confidential and
property of Andre Courchesne. It shall not be used, disclosed to
others or reproduced without the express written consent of Andre
Courchesne.
On 2009-09-27, at 7:33 PM, Peter MacFarlane wrote:
I fixed that 9112i. Replaced what seemed to be a fuse (on my
working phone) with a loop of wirewrap wire. I was thinking maybe
that will melt if there is a problem again. After that the phone
works fine. Hopefully it will stay that way.
Peter M.
Peter MacFarlane wrote:
Thanks. Ya, I was going to use a larger resistor. Guess I'll have
to open my phone and see what's there. That's a good point about
the bridge rectifier. The power packs are 9V, 1A. Usually the
phone runs pretty hot. I'm surprised an SM resistor going to the
BR would survive.
Peter M.
Douglas Pickett wrote:
Peter,
Don't forget that resistors come in different power ratings -
using Henry's suggestion that resistor could be dissipating 1.5
Watts. The most common resistors with wire leads are rated at
0.25 watts. Use a quarter watt resistor where you should be using
a larger one will result in another crispy component.
Regards,
Doug.
----- Original Message ----- From: "Henry L.Coleman" <[email protected]
>
To: <[email protected]>
Sent: Monday, August 31, 2009 12:11 PM
Subject: Re: [on-asterisk] Repair of Aastra 9112i
Hi Peter, if this resistor is open circuit then the only way to
know what value it was is to contact Aastra or ...
If he resistor was in series on the AC side of the bridge
rectifier it probable acts a current regulating device
in which case the bridge recifier could have sorted and blown the
resister (like a fuse) so before you change it check
the BR. The resistor value itself can be approximated by using
ohms law: V=I/R etc.
If the device power supply is 5v at 330ma (just guessing) then
the device has an internal resistance of:
5v x 0.3amps = 15 ohms
Therefore start at that value and reduce it until the resistor
gets slightly warm over a 5 minute period
Good luck
Henry L.Coleman [VoIP-PBX.ca]
-------------------------------------------------
Peter MacFarlane<
Hi All:
I have a client's 9112i that has apparently burned its power
supply
out. There is a nice crispy resistor just before the bridge
rectifier
on the mainboard. Anyone ever replace this resistor? Anyone
know what
size it is (was)? I think these models have an overheating
problem.
I'm just hoping my lasts for a while.
Peter M.
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