[GreenKeys] What an Idiot!

[Teletypeparts]

Rob,

Not on the lower sizes of course, just the 3 amp one.  

Wayne



-----Original Message-----
From: Robert Jarratt <robert.jarratt at ntlworld.com>
To: 'Ken Schwieker' <ksweek at mindspring.com>; GreenKeys <GreenKeys at mailman.qth.net>
Sent: Sun, May 26, 2013 5:41 pm
Subject: Re: [GreenKeys] What an Idiot!


Yes, I am familiar with the lightbulb trick, it's a good idea, I will do
hat when I get the new fuses. I think the best thing will be to put the
ulb on the 240V side.
Thanks
Rob
> -----Original Message-----
 From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-
 bounces at mailman.qth.net] On Behalf Of Ken Schwieker
 Sent: 26 May 2013 12:12
 To: GreenKeys at mailman.qth.net
 Subject: Re: [GreenKeys] What an Idiot!
 
 If connecting power to a questionable circuit it is a good idea to limit
he
 current by inserting a medium wattage incandescent light bulb in series
ith
 the input power line. Since you are unlikely to have a 120 volt bulb it
ay be
 OK to use a 220 volt bulb in the 120 volt line or the primary of the step
own
 transformer. The motor would need to be temporality out of the circuit to
 keep it from loading down the part you are testing.
 
 Ken S
 
 
 At 04:27 AM 5/26/2013, you wrote:
 >Some additional information.
 >
 >When I first blew the plug fuses I suspected a short. So I tested across
he
 >pins of the plug, sure enough when I switched the switch to LOCAL I
 measured
 >a short. Removing all the plugs from the back of the CCU (this is a
omputer
 >i/o set) the short went away. I narrowed it down to the connector marked
 >with a '4' on the CCU back panel. The wires are very hard to trace
ecause
 >they are tightly packed so I am not sure where the wires for this go. I
 >suspect this is not normal. However, once I connected it back to 110V,
he
 >machine stayed on, running open, and the fuse in the plug did not blow
 >again, so I wonder if that apparent short is normal?
 >
 >I have since checked the internal fuses and found that two of them have
 >blown. Looking from the back of the CCU they are the two on the right. I
 >also checked the fuse on the far right, near the paper tape punch , which
s
 >fine. I wonder if it would be safe to replace the blown fuses and try
 >switching on again? With other potentially damaged components could I
 end up
 >doing more damage if I don't check and repair them first?
 >
 >I believe the fuses have to be "slow blow". Farnell lists some as "slow
 >blow" and some as "time delay", not sure if there is a difference, but
or
 >one of the fuses they list "time delay" ones but not any "slow blow"
nes.
 >Is there a difference?
 >
 >Regards
 >
 >Rob
 
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