HP 2113B service manual / schematics

From: Joe R. <rigdonj_at_cfl.rr.com>
Date: Wed Nov 17 17:54:13 2004

At 06:35 PM 11/17/04 +0000, you wrote:
>Hi Joe,
>
>>One of the things that I noticed was that the computer kept running and
>>even though I turned >off the power switch the cap kept sizzling.
>
>On the 2113 (and I guess from your description the 2117) the capacitor is
>directly across the terminals on the mains input socket - i.e. on the
>'always hot' side of the on/off switch. So turning the power off behind the
>front panel of the computer won't help.

  Yeah I sort of noticed that! But it's sort of funny that they don't seem to fail unless the machine is running.

    Joe
  

>
>In order to effectively control interference the capacitor has to be mounted
>as close to the point at which mains enters the equipment enclosure as
>possible. Mounting it further away causes the input leads to act like an
>antenna inside the enclosure.
>
>>I had to unplug the line cord to stop it.
>
>Yep, this is the only way to shut the power off to this capacitor, it is
>always live when the equipment is plugged into a live mains socket.
>
>A good reason NOT to leave this sort of equipment plugged in but turned off!
>
>Peter Brown
>
>
>
Received on Wed Nov 17 2004 - 17:54:13 GMT