[GreenKeys] Just brought that Teletype home ? Do this FIRST

[drlegendre .]

Fuses for M15 (and perhaps 14, others?) are easy to sub-out. (Sorry if this
is yet another repeat - but I've never heard of anyone else trying it..)

If the machine uses a screw-base fuse, replace the fuse with with a
screw-base outlet socket - same kind that fits a regular 120V lamp socket.
Then create a dongle by wiring an inline type fuseholder to a regular,
replacement AC line plug. Insert the correct rating fuse (1.4A slow) into
the holder and then insert the plug into the socket.

Now you can use easily available glass cartridge fuses, rather than
expensive screw-base types. Way more economical, far as I am concerned.

On Mon, Jun 26, 2017 at 5:55 PM, John Nagle <nagle at animats.com> wrote:

> Date: Mon, 26 Jun 2017 12:51:07 -0700
>> From: Pete Lancashire<pete at petelancashire.com>
>> Subject: [GreenKeys] Just brought that Teletype home ? Do this FIRST
>>
>> Check the fuse(s) for the correct amperage !
>>
>> In this case the motor fuse should be 2-1/4 Amps, even has a paper label
>> saying such.
>>
>> Fuse inside was 10 A.
>>
>
>     I've received a Model 15 with a 15A fuse in the fuse
> holder.  It's supposed to be a 1.4 amp Fusetron slow-blow.
>
> My electrical checklist for newly received Model 14/15 machines:
>
> - Check for broken insulation, especially on the motor leads and
> power cord. That may need replacement.
>
> - Model 14 machines usually need a complete rewiring if they
> still have the original varnished fabric insulation.  Model
> 15 machines use General Electric Deltabeston felted asbestos
> insulation ("will not age or crack"), and it's usually fine.
> But don't strip those wires and let the asbestos out;
> cut them out entirely if you have to replace.
>
> - I install a 3 amp breaker or fuse in all Model 14 machines.
> They totally lack any built-in protection.
>
> - Use ohmmeter to check for shorts between either side of
> motor power and ground. Motor should be totally isolated
> from ground.
>
> - DC resistance of motor should be about 4 ohms.
>
> - Check printer and keyboard cables. Resistance of the
> printer should be around 55 or 220 ohms. Printer should
> be isolated from keyboard and from ground.
>
> - Turn motor counterclockwise to see if mechanism is
> jammed.  Mechanism should cycle.
>
> - Turn motor CCW until selector magnet moves freely.
> Then apply a 9v battery to the printer connection.
> The selector magnet should click.
>
> - Using a GFCI and an outlet strip with a circuit breaker,
> attempt a motor power-up from a safe distance.
>
> - If the machine will run open, apply the 9V battery
> again to see if the clutches will disengage and put the
> machine in a normal idle.
>
>                         John Nagle
>
>
>
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