my multiplexer falls asleep.........tales from a by-gone era

[shek 0]

This one is for the veterans...

 

subject: AVITECH AVC 706 multiplexer,

 

I would be greatful if anyone can tell me, why the MPX powers up and shuts down when it wants to. A high pitch audio tone sounds continually and all indicator lights remain off.

 

switching off and on restores the machine, only to watch it do the same again.

 

 

shek.

[Squiffy 0]

Something overheating? PSU playing up? Intermittent power cable connections?

[scorpion 0]

Do you have an AVTech AVC 760 DVR?

 

If yes then:

 

Yes, they beep real loud during power up. This is to wake up a "security guard", "owner", "Manager" ect, that you have a power outage, and you should check the cameras, and the system to make sure all is operational.

 

We need to find out why your system is shutting down.

 

This may be a power supply issue.

 

It may be the external power supply. It may be bad causing the issue.

 

You may have an internal power supply board that is causing problems, and it "crashes" the external power supply by going in to overload protection.

 

You may have a hard drive that is causing the internal power supply to crash.

 

________________________________________________________

 

Lets start with the easy stuff.

 

1 change out the hard drive.

 

If it no longer crashes then you have solved the problem.

 

If it still has a problem then change the outside power supply. You may find one for a laptop computer that has the same specs.

 

If it crashes again then you will need to replace the internal power supply.

 

_____________________________________________________________

 

AVC 760 Power Supply

Vellman Specs 19 Volts 3.7A 60 Watt

 

Adapter Technology Co 19V 90 Watt

Model STD-1947P

 

Velleman 19 Volt 3.7Amps

http://www.velleman.be/nl/en/product/view/?id=351251

 

_____________________________________________________________

 

http://scorpiontheater.com/cpcamtechsupport.aspx

[shek 0]

shek replies

 

Thanks Squify, thanks Scorpion.

 

I can confirm that it is a Multiplexer (16 way) AVC 706- ancient I know, but it used to behave better.

I am keen to get the soldering iron to it but, without manual or any literature or circ diagram, I might spend more time on it than it deserves.

 

but I will be looking at any shorts on the external psu side first.

 

After 2 days as a member I am impressed and greatfull for the response.

 

All ideas are welcome.

 

thanks

Shek

[scorpion 0]

Lets see if this email will get their attention?

 

喂！

 

我期待一个手册的AVC 706复用器。这是一个古老的设备，我想看看如果你有一个副本，您可以给我。

 

谢谢您！

[survtech 0]

抱歉，没有票，没有洗涤!

[hardwired 0]

Sounds kind of like when old Robot multiplexer power supplies half fail, passing some AC through to the mux. You might want to start with a new PSU to test.

 

这是我的年龄！太老了！

[shek 0]

Shek,

 

Thanks guys,

 

It seems we are all focussing in the same area so may be that is it.

I have 2 alternative psu to try this next day.

 

But if anyone can point me in the right direction for tech info or circuit diag I will be happy.

 

many thanks

shek

[survtech 0]

蹲下的老虎，暗藏的龙.

飞行匕首议院.